Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit Merge branch 'as/doc-for-devs' (c2c6a70)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5#include "../run-command.h"
   6
   7static const int delay[] = { 0, 1, 10, 20, 40 };
   8
   9int err_win_to_posix(DWORD winerr)
  10{
  11        int error = ENOSYS;
  12        switch(winerr) {
  13        case ERROR_ACCESS_DENIED: error = EACCES; break;
  14        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  15        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  16        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  17        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  18        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  19        case ERROR_BAD_COMMAND: error = EIO; break;
  20        case ERROR_BAD_DEVICE: error = ENODEV; break;
  21        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  22        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  23        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  24        case ERROR_BAD_LENGTH: error = EINVAL; break;
  25        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  26        case ERROR_BAD_PIPE: error = EPIPE; break;
  27        case ERROR_BAD_UNIT: error = ENODEV; break;
  28        case ERROR_BAD_USERNAME: error = EINVAL; break;
  29        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  30        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  31        case ERROR_BUSY: error = EBUSY; break;
  32        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  33        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  34        case ERROR_CANNOT_MAKE: error = EACCES; break;
  35        case ERROR_CANTOPEN: error = EIO; break;
  36        case ERROR_CANTREAD: error = EIO; break;
  37        case ERROR_CANTWRITE: error = EIO; break;
  38        case ERROR_CRC: error = EIO; break;
  39        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  40        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  41        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  42        case ERROR_DIRECTORY: error = EINVAL; break;
  43        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  44        case ERROR_DISK_CHANGE: error = EIO; break;
  45        case ERROR_DISK_FULL: error = ENOSPC; break;
  46        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  47        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  48        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  49        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  50        case ERROR_FILE_EXISTS: error = EEXIST; break;
  51        case ERROR_FILE_INVALID: error = ENODEV; break;
  52        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  53        case ERROR_GEN_FAILURE: error = EIO; break;
  54        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  55        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  56        case ERROR_INVALID_ACCESS: error = EACCES; break;
  57        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  58        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  59        case ERROR_INVALID_DATA: error = EINVAL; break;
  60        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  61        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  62        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  63        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  64        case ERROR_INVALID_HANDLE: error = EBADF; break;
  65        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  66        case ERROR_INVALID_NAME: error = EINVAL; break;
  67        case ERROR_INVALID_OWNER: error = EINVAL; break;
  68        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  69        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  70        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  71        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  72        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  73        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  74        case ERROR_IO_DEVICE: error = EIO; break;
  75        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  76        case ERROR_LOCKED: error = EBUSY; break;
  77        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  78        case ERROR_LOGON_FAILURE: error = EACCES; break;
  79        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  80        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  81        case ERROR_MORE_DATA: error = EPIPE; break;
  82        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  83        case ERROR_NOACCESS: error = EFAULT; break;
  84        case ERROR_NONE_MAPPED: error = EINVAL; break;
  85        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  86        case ERROR_NOT_READY: error = EAGAIN; break;
  87        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  88        case ERROR_NO_DATA: error = EPIPE; break;
  89        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  90        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  91        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  92        case ERROR_OPEN_FAILED: error = EIO; break;
  93        case ERROR_OPEN_FILES: error = EBUSY; break;
  94        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  95        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  96        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  97        case ERROR_PATH_BUSY: error = EBUSY; break;
  98        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  99        case ERROR_PIPE_BUSY: error = EBUSY; break;
 100        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 101        case ERROR_PIPE_LISTENING: error = EPIPE; break;
 102        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 103        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 104        case ERROR_READ_FAULT: error = EIO; break;
 105        case ERROR_SEEK: error = EIO; break;
 106        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 107        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 108        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 109        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 110        case ERROR_SWAPERROR: error = ENOENT; break;
 111        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 112        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 113        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 114        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 115        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 116        case ERROR_WRITE_FAULT: error = EIO; break;
 117        case ERROR_WRITE_PROTECT: error = EROFS; break;
 118        }
 119        return error;
 120}
 121
 122static inline int is_file_in_use_error(DWORD errcode)
 123{
 124        switch (errcode) {
 125        case ERROR_SHARING_VIOLATION:
 126        case ERROR_ACCESS_DENIED:
 127                return 1;
 128        }
 129
 130        return 0;
 131}
 132
 133static int read_yes_no_answer(void)
 134{
 135        char answer[1024];
 136
 137        if (fgets(answer, sizeof(answer), stdin)) {
 138                size_t answer_len = strlen(answer);
 139                int got_full_line = 0, c;
 140
 141                /* remove the newline */
 142                if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 143                        answer[answer_len-2] = '\0';
 144                        got_full_line = 1;
 145                } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 146                        answer[answer_len-1] = '\0';
 147                        got_full_line = 1;
 148                }
 149                /* flush the buffer in case we did not get the full line */
 150                if (!got_full_line)
 151                        while ((c = getchar()) != EOF && c != '\n')
 152                                ;
 153        } else
 154                /* we could not read, return the
 155                 * default answer which is no */
 156                return 0;
 157
 158        if (tolower(answer[0]) == 'y' && !answer[1])
 159                return 1;
 160        if (!strncasecmp(answer, "yes", sizeof(answer)))
 161                return 1;
 162        if (tolower(answer[0]) == 'n' && !answer[1])
 163                return 0;
 164        if (!strncasecmp(answer, "no", sizeof(answer)))
 165                return 0;
 166
 167        /* did not find an answer we understand */
 168        return -1;
 169}
 170
 171static int ask_yes_no_if_possible(const char *format, ...)
 172{
 173        char question[4096];
 174        const char *retry_hook[] = { NULL, NULL, NULL };
 175        va_list args;
 176
 177        va_start(args, format);
 178        vsnprintf(question, sizeof(question), format, args);
 179        va_end(args);
 180
 181        if ((retry_hook[0] = mingw_getenv("GIT_ASK_YESNO"))) {
 182                retry_hook[1] = question;
 183                return !run_command_v_opt(retry_hook, 0);
 184        }
 185
 186        if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 187                return 0;
 188
 189        while (1) {
 190                int answer;
 191                fprintf(stderr, "%s (y/n) ", question);
 192
 193                if ((answer = read_yes_no_answer()) >= 0)
 194                        return answer;
 195
 196                fprintf(stderr, "Sorry, I did not understand your answer. "
 197                                "Please type 'y' or 'n'\n");
 198        }
 199}
 200
 201#undef unlink
 202int mingw_unlink(const char *pathname)
 203{
 204        int ret, tries = 0;
 205
 206        /* read-only files cannot be removed */
 207        chmod(pathname, 0666);
 208        while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 209                if (!is_file_in_use_error(GetLastError()))
 210                        break;
 211                /*
 212                 * We assume that some other process had the source or
 213                 * destination file open at the wrong moment and retry.
 214                 * In order to give the other process a higher chance to
 215                 * complete its operation, we give up our time slice now.
 216                 * If we have to retry again, we do sleep a bit.
 217                 */
 218                Sleep(delay[tries]);
 219                tries++;
 220        }
 221        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 222               ask_yes_no_if_possible("Unlink of file '%s' failed. "
 223                        "Should I try again?", pathname))
 224               ret = unlink(pathname);
 225        return ret;
 226}
 227
 228static int is_dir_empty(const char *path)
 229{
 230        struct strbuf buf = STRBUF_INIT;
 231        WIN32_FIND_DATAA findbuf;
 232        HANDLE handle;
 233
 234        strbuf_addf(&buf, "%s\\*", path);
 235        handle = FindFirstFileA(buf.buf, &findbuf);
 236        if (handle == INVALID_HANDLE_VALUE) {
 237                strbuf_release(&buf);
 238                return GetLastError() == ERROR_NO_MORE_FILES;
 239        }
 240
 241        while (!strcmp(findbuf.cFileName, ".") ||
 242                        !strcmp(findbuf.cFileName, ".."))
 243                if (!FindNextFile(handle, &findbuf)) {
 244                        strbuf_release(&buf);
 245                        return GetLastError() == ERROR_NO_MORE_FILES;
 246                }
 247        FindClose(handle);
 248        strbuf_release(&buf);
 249        return 0;
 250}
 251
 252#undef rmdir
 253int mingw_rmdir(const char *pathname)
 254{
 255        int ret, tries = 0;
 256
 257        while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 258                if (!is_file_in_use_error(GetLastError()))
 259                        errno = err_win_to_posix(GetLastError());
 260                if (errno != EACCES)
 261                        break;
 262                if (!is_dir_empty(pathname)) {
 263                        errno = ENOTEMPTY;
 264                        break;
 265                }
 266                /*
 267                 * We assume that some other process had the source or
 268                 * destination file open at the wrong moment and retry.
 269                 * In order to give the other process a higher chance to
 270                 * complete its operation, we give up our time slice now.
 271                 * If we have to retry again, we do sleep a bit.
 272                 */
 273                Sleep(delay[tries]);
 274                tries++;
 275        }
 276        while (ret == -1 && errno == EACCES && is_file_in_use_error(GetLastError()) &&
 277               ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 278                        "Should I try again?", pathname))
 279               ret = rmdir(pathname);
 280        return ret;
 281}
 282
 283#undef open
 284int mingw_open (const char *filename, int oflags, ...)
 285{
 286        va_list args;
 287        unsigned mode;
 288        int fd;
 289
 290        va_start(args, oflags);
 291        mode = va_arg(args, int);
 292        va_end(args);
 293
 294        if (filename && !strcmp(filename, "/dev/null"))
 295                filename = "nul";
 296
 297        fd = open(filename, oflags, mode);
 298
 299        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 300                DWORD attrs = GetFileAttributes(filename);
 301                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 302                        errno = EISDIR;
 303        }
 304        return fd;
 305}
 306
 307#undef write
 308ssize_t mingw_write(int fd, const void *buf, size_t count)
 309{
 310        /*
 311         * While write() calls to a file on a local disk are translated
 312         * into WriteFile() calls with a maximum size of 64KB on Windows
 313         * XP and 256KB on Vista, no such cap is placed on writes to
 314         * files over the network on Windows XP.  Unfortunately, there
 315         * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 316         * bigger writes fail on Windows XP.
 317         * So we cap to a nice 31MB here to avoid write failures over
 318         * the net without changing the number of WriteFile() calls in
 319         * the local case.
 320         */
 321        return write(fd, buf, min(count, 31 * 1024 * 1024));
 322}
 323
 324static BOOL WINAPI ctrl_ignore(DWORD type)
 325{
 326        return TRUE;
 327}
 328
 329#undef fgetc
 330int mingw_fgetc(FILE *stream)
 331{
 332        int ch;
 333        if (!isatty(_fileno(stream)))
 334                return fgetc(stream);
 335
 336        SetConsoleCtrlHandler(ctrl_ignore, TRUE);
 337        while (1) {
 338                ch = fgetc(stream);
 339                if (ch != EOF || GetLastError() != ERROR_OPERATION_ABORTED)
 340                        break;
 341
 342                /* Ctrl+C was pressed, simulate SIGINT and retry */
 343                mingw_raise(SIGINT);
 344        }
 345        SetConsoleCtrlHandler(ctrl_ignore, FALSE);
 346        return ch;
 347}
 348
 349#undef fopen
 350FILE *mingw_fopen (const char *filename, const char *otype)
 351{
 352        if (filename && !strcmp(filename, "/dev/null"))
 353                filename = "nul";
 354        return fopen(filename, otype);
 355}
 356
 357#undef freopen
 358FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 359{
 360        if (filename && !strcmp(filename, "/dev/null"))
 361                filename = "nul";
 362        return freopen(filename, otype, stream);
 363}
 364
 365#undef fflush
 366int mingw_fflush(FILE *stream)
 367{
 368        int ret = fflush(stream);
 369
 370        /*
 371         * write() is used behind the scenes of stdio output functions.
 372         * Since git code does not check for errors after each stdio write
 373         * operation, it can happen that write() is called by a later
 374         * stdio function even if an earlier write() call failed. In the
 375         * case of a pipe whose readable end was closed, only the first
 376         * call to write() reports EPIPE on Windows. Subsequent write()
 377         * calls report EINVAL. It is impossible to notice whether this
 378         * fflush invocation triggered such a case, therefore, we have to
 379         * catch all EINVAL errors whole-sale.
 380         */
 381        if (ret && errno == EINVAL)
 382                errno = EPIPE;
 383
 384        return ret;
 385}
 386
 387/*
 388 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 389 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 390 */
 391static inline long long filetime_to_hnsec(const FILETIME *ft)
 392{
 393        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 394        /* Windows to Unix Epoch conversion */
 395        return winTime - 116444736000000000LL;
 396}
 397
 398static inline time_t filetime_to_time_t(const FILETIME *ft)
 399{
 400        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 401}
 402
 403/* We keep the do_lstat code in a separate function to avoid recursion.
 404 * When a path ends with a slash, the stat will fail with ENOENT. In
 405 * this case, we strip the trailing slashes and stat again.
 406 *
 407 * If follow is true then act like stat() and report on the link
 408 * target. Otherwise report on the link itself.
 409 */
 410static int do_lstat(int follow, const char *file_name, struct stat *buf)
 411{
 412        int err;
 413        WIN32_FILE_ATTRIBUTE_DATA fdata;
 414
 415        if (!(err = get_file_attr(file_name, &fdata))) {
 416                buf->st_ino = 0;
 417                buf->st_gid = 0;
 418                buf->st_uid = 0;
 419                buf->st_nlink = 1;
 420                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 421                buf->st_size = fdata.nFileSizeLow |
 422                        (((off_t)fdata.nFileSizeHigh)<<32);
 423                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 424                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 425                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 426                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 427                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 428                        WIN32_FIND_DATAA findbuf;
 429                        HANDLE handle = FindFirstFileA(file_name, &findbuf);
 430                        if (handle != INVALID_HANDLE_VALUE) {
 431                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 432                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 433                                        if (follow) {
 434                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 435                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 436                                        } else {
 437                                                buf->st_mode = S_IFLNK;
 438                                        }
 439                                        buf->st_mode |= S_IREAD;
 440                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 441                                                buf->st_mode |= S_IWRITE;
 442                                }
 443                                FindClose(handle);
 444                        }
 445                }
 446                return 0;
 447        }
 448        errno = err;
 449        return -1;
 450}
 451
 452/* We provide our own lstat/fstat functions, since the provided
 453 * lstat/fstat functions are so slow. These stat functions are
 454 * tailored for Git's usage (read: fast), and are not meant to be
 455 * complete. Note that Git stat()s are redirected to mingw_lstat()
 456 * too, since Windows doesn't really handle symlinks that well.
 457 */
 458static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 459{
 460        int namelen;
 461        static char alt_name[PATH_MAX];
 462
 463        if (!do_lstat(follow, file_name, buf))
 464                return 0;
 465
 466        /* if file_name ended in a '/', Windows returned ENOENT;
 467         * try again without trailing slashes
 468         */
 469        if (errno != ENOENT)
 470                return -1;
 471
 472        namelen = strlen(file_name);
 473        if (namelen && file_name[namelen-1] != '/')
 474                return -1;
 475        while (namelen && file_name[namelen-1] == '/')
 476                --namelen;
 477        if (!namelen || namelen >= PATH_MAX)
 478                return -1;
 479
 480        memcpy(alt_name, file_name, namelen);
 481        alt_name[namelen] = 0;
 482        return do_lstat(follow, alt_name, buf);
 483}
 484
 485int mingw_lstat(const char *file_name, struct stat *buf)
 486{
 487        return do_stat_internal(0, file_name, buf);
 488}
 489int mingw_stat(const char *file_name, struct stat *buf)
 490{
 491        return do_stat_internal(1, file_name, buf);
 492}
 493
 494#undef fstat
 495int mingw_fstat(int fd, struct stat *buf)
 496{
 497        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 498        BY_HANDLE_FILE_INFORMATION fdata;
 499
 500        if (fh == INVALID_HANDLE_VALUE) {
 501                errno = EBADF;
 502                return -1;
 503        }
 504        /* direct non-file handles to MS's fstat() */
 505        if (GetFileType(fh) != FILE_TYPE_DISK)
 506                return _fstati64(fd, buf);
 507
 508        if (GetFileInformationByHandle(fh, &fdata)) {
 509                buf->st_ino = 0;
 510                buf->st_gid = 0;
 511                buf->st_uid = 0;
 512                buf->st_nlink = 1;
 513                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 514                buf->st_size = fdata.nFileSizeLow |
 515                        (((off_t)fdata.nFileSizeHigh)<<32);
 516                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 517                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 518                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 519                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 520                return 0;
 521        }
 522        errno = EBADF;
 523        return -1;
 524}
 525
 526static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 527{
 528        long long winTime = t * 10000000LL + 116444736000000000LL;
 529        ft->dwLowDateTime = winTime;
 530        ft->dwHighDateTime = winTime >> 32;
 531}
 532
 533int mingw_utime (const char *file_name, const struct utimbuf *times)
 534{
 535        FILETIME mft, aft;
 536        int fh, rc;
 537
 538        /* must have write permission */
 539        DWORD attrs = GetFileAttributes(file_name);
 540        if (attrs != INVALID_FILE_ATTRIBUTES &&
 541            (attrs & FILE_ATTRIBUTE_READONLY)) {
 542                /* ignore errors here; open() will report them */
 543                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 544        }
 545
 546        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 547                rc = -1;
 548                goto revert_attrs;
 549        }
 550
 551        if (times) {
 552                time_t_to_filetime(times->modtime, &mft);
 553                time_t_to_filetime(times->actime, &aft);
 554        } else {
 555                GetSystemTimeAsFileTime(&mft);
 556                aft = mft;
 557        }
 558        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 559                errno = EINVAL;
 560                rc = -1;
 561        } else
 562                rc = 0;
 563        close(fh);
 564
 565revert_attrs:
 566        if (attrs != INVALID_FILE_ATTRIBUTES &&
 567            (attrs & FILE_ATTRIBUTE_READONLY)) {
 568                /* ignore errors again */
 569                SetFileAttributes(file_name, attrs);
 570        }
 571        return rc;
 572}
 573
 574unsigned int sleep (unsigned int seconds)
 575{
 576        Sleep(seconds*1000);
 577        return 0;
 578}
 579
 580int mkstemp(char *template)
 581{
 582        char *filename = mktemp(template);
 583        if (filename == NULL)
 584                return -1;
 585        return open(filename, O_RDWR | O_CREAT, 0600);
 586}
 587
 588int gettimeofday(struct timeval *tv, void *tz)
 589{
 590        FILETIME ft;
 591        long long hnsec;
 592
 593        GetSystemTimeAsFileTime(&ft);
 594        hnsec = filetime_to_hnsec(&ft);
 595        tv->tv_sec = hnsec / 10000000;
 596        tv->tv_usec = (hnsec % 10000000) / 10;
 597        return 0;
 598}
 599
 600int pipe(int filedes[2])
 601{
 602        HANDLE h[2];
 603
 604        /* this creates non-inheritable handles */
 605        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 606                errno = err_win_to_posix(GetLastError());
 607                return -1;
 608        }
 609        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 610        if (filedes[0] < 0) {
 611                CloseHandle(h[0]);
 612                CloseHandle(h[1]);
 613                return -1;
 614        }
 615        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 616        if (filedes[0] < 0) {
 617                close(filedes[0]);
 618                CloseHandle(h[1]);
 619                return -1;
 620        }
 621        return 0;
 622}
 623
 624struct tm *gmtime_r(const time_t *timep, struct tm *result)
 625{
 626        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 627        memcpy(result, gmtime(timep), sizeof(struct tm));
 628        return result;
 629}
 630
 631struct tm *localtime_r(const time_t *timep, struct tm *result)
 632{
 633        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 634        memcpy(result, localtime(timep), sizeof(struct tm));
 635        return result;
 636}
 637
 638#undef getcwd
 639char *mingw_getcwd(char *pointer, int len)
 640{
 641        int i;
 642        char *ret = getcwd(pointer, len);
 643        if (!ret)
 644                return ret;
 645        for (i = 0; pointer[i]; i++)
 646                if (pointer[i] == '\\')
 647                        pointer[i] = '/';
 648        return ret;
 649}
 650
 651/*
 652 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 653 * (Parsing C++ Command-Line Arguments)
 654 */
 655static const char *quote_arg(const char *arg)
 656{
 657        /* count chars to quote */
 658        int len = 0, n = 0;
 659        int force_quotes = 0;
 660        char *q, *d;
 661        const char *p = arg;
 662        if (!*p) force_quotes = 1;
 663        while (*p) {
 664                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 665                        force_quotes = 1;
 666                else if (*p == '"')
 667                        n++;
 668                else if (*p == '\\') {
 669                        int count = 0;
 670                        while (*p == '\\') {
 671                                count++;
 672                                p++;
 673                                len++;
 674                        }
 675                        if (*p == '"')
 676                                n += count*2 + 1;
 677                        continue;
 678                }
 679                len++;
 680                p++;
 681        }
 682        if (!force_quotes && n == 0)
 683                return arg;
 684
 685        /* insert \ where necessary */
 686        d = q = xmalloc(len+n+3);
 687        *d++ = '"';
 688        while (*arg) {
 689                if (*arg == '"')
 690                        *d++ = '\\';
 691                else if (*arg == '\\') {
 692                        int count = 0;
 693                        while (*arg == '\\') {
 694                                count++;
 695                                *d++ = *arg++;
 696                        }
 697                        if (*arg == '"') {
 698                                while (count-- > 0)
 699                                        *d++ = '\\';
 700                                *d++ = '\\';
 701                        }
 702                }
 703                *d++ = *arg++;
 704        }
 705        *d++ = '"';
 706        *d++ = 0;
 707        return q;
 708}
 709
 710static const char *parse_interpreter(const char *cmd)
 711{
 712        static char buf[100];
 713        char *p, *opt;
 714        int n, fd;
 715
 716        /* don't even try a .exe */
 717        n = strlen(cmd);
 718        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 719                return NULL;
 720
 721        fd = open(cmd, O_RDONLY);
 722        if (fd < 0)
 723                return NULL;
 724        n = read(fd, buf, sizeof(buf)-1);
 725        close(fd);
 726        if (n < 4)      /* at least '#!/x' and not error */
 727                return NULL;
 728
 729        if (buf[0] != '#' || buf[1] != '!')
 730                return NULL;
 731        buf[n] = '\0';
 732        p = buf + strcspn(buf, "\r\n");
 733        if (!*p)
 734                return NULL;
 735
 736        *p = '\0';
 737        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 738                return NULL;
 739        /* strip options */
 740        if ((opt = strchr(p+1, ' ')))
 741                *opt = '\0';
 742        return p+1;
 743}
 744
 745/*
 746 * Splits the PATH into parts.
 747 */
 748static char **get_path_split(void)
 749{
 750        char *p, **path, *envpath = mingw_getenv("PATH");
 751        int i, n = 0;
 752
 753        if (!envpath || !*envpath)
 754                return NULL;
 755
 756        envpath = xstrdup(envpath);
 757        p = envpath;
 758        while (p) {
 759                char *dir = p;
 760                p = strchr(p, ';');
 761                if (p) *p++ = '\0';
 762                if (*dir) {     /* not earlier, catches series of ; */
 763                        ++n;
 764                }
 765        }
 766        if (!n)
 767                return NULL;
 768
 769        path = xmalloc((n+1)*sizeof(char *));
 770        p = envpath;
 771        i = 0;
 772        do {
 773                if (*p)
 774                        path[i++] = xstrdup(p);
 775                p = p+strlen(p)+1;
 776        } while (i < n);
 777        path[i] = NULL;
 778
 779        free(envpath);
 780
 781        return path;
 782}
 783
 784static void free_path_split(char **path)
 785{
 786        char **p = path;
 787
 788        if (!path)
 789                return;
 790
 791        while (*p)
 792                free(*p++);
 793        free(path);
 794}
 795
 796/*
 797 * exe_only means that we only want to detect .exe files, but not scripts
 798 * (which do not have an extension)
 799 */
 800static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 801{
 802        char path[MAX_PATH];
 803        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 804
 805        if (!isexe && access(path, F_OK) == 0)
 806                return xstrdup(path);
 807        path[strlen(path)-4] = '\0';
 808        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 809                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 810                        return xstrdup(path);
 811        return NULL;
 812}
 813
 814/*
 815 * Determines the absolute path of cmd using the split path in path.
 816 * If cmd contains a slash or backslash, no lookup is performed.
 817 */
 818static char *path_lookup(const char *cmd, char **path, int exe_only)
 819{
 820        char *prog = NULL;
 821        int len = strlen(cmd);
 822        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 823
 824        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 825                prog = xstrdup(cmd);
 826
 827        while (!prog && *path)
 828                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 829
 830        return prog;
 831}
 832
 833static int env_compare(const void *a, const void *b)
 834{
 835        char *const *ea = a;
 836        char *const *eb = b;
 837        return strcasecmp(*ea, *eb);
 838}
 839
 840struct pinfo_t {
 841        struct pinfo_t *next;
 842        pid_t pid;
 843        HANDLE proc;
 844} pinfo_t;
 845struct pinfo_t *pinfo = NULL;
 846CRITICAL_SECTION pinfo_cs;
 847
 848static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 849                              const char *dir,
 850                              int prepend_cmd, int fhin, int fhout, int fherr)
 851{
 852        STARTUPINFO si;
 853        PROCESS_INFORMATION pi;
 854        struct strbuf envblk, args;
 855        unsigned flags;
 856        BOOL ret;
 857
 858        /* Determine whether or not we are associated to a console */
 859        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 860                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 861                        FILE_ATTRIBUTE_NORMAL, NULL);
 862        if (cons == INVALID_HANDLE_VALUE) {
 863                /* There is no console associated with this process.
 864                 * Since the child is a console process, Windows
 865                 * would normally create a console window. But
 866                 * since we'll be redirecting std streams, we do
 867                 * not need the console.
 868                 * It is necessary to use DETACHED_PROCESS
 869                 * instead of CREATE_NO_WINDOW to make ssh
 870                 * recognize that it has no console.
 871                 */
 872                flags = DETACHED_PROCESS;
 873        } else {
 874                /* There is already a console. If we specified
 875                 * DETACHED_PROCESS here, too, Windows would
 876                 * disassociate the child from the console.
 877                 * The same is true for CREATE_NO_WINDOW.
 878                 * Go figure!
 879                 */
 880                flags = 0;
 881                CloseHandle(cons);
 882        }
 883        memset(&si, 0, sizeof(si));
 884        si.cb = sizeof(si);
 885        si.dwFlags = STARTF_USESTDHANDLES;
 886        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 887        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 888        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 889
 890        /* concatenate argv, quoting args as we go */
 891        strbuf_init(&args, 0);
 892        if (prepend_cmd) {
 893                char *quoted = (char *)quote_arg(cmd);
 894                strbuf_addstr(&args, quoted);
 895                if (quoted != cmd)
 896                        free(quoted);
 897        }
 898        for (; *argv; argv++) {
 899                char *quoted = (char *)quote_arg(*argv);
 900                if (*args.buf)
 901                        strbuf_addch(&args, ' ');
 902                strbuf_addstr(&args, quoted);
 903                if (quoted != *argv)
 904                        free(quoted);
 905        }
 906
 907        if (env) {
 908                int count = 0;
 909                char **e, **sorted_env;
 910
 911                for (e = env; *e; e++)
 912                        count++;
 913
 914                /* environment must be sorted */
 915                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 916                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 917                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 918
 919                strbuf_init(&envblk, 0);
 920                for (e = sorted_env; *e; e++) {
 921                        strbuf_addstr(&envblk, *e);
 922                        strbuf_addch(&envblk, '\0');
 923                }
 924                free(sorted_env);
 925        }
 926
 927        memset(&pi, 0, sizeof(pi));
 928        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 929                env ? envblk.buf : NULL, dir, &si, &pi);
 930
 931        if (env)
 932                strbuf_release(&envblk);
 933        strbuf_release(&args);
 934
 935        if (!ret) {
 936                errno = ENOENT;
 937                return -1;
 938        }
 939        CloseHandle(pi.hThread);
 940
 941        /*
 942         * The process ID is the human-readable identifier of the process
 943         * that we want to present in log and error messages. The handle
 944         * is not useful for this purpose. But we cannot close it, either,
 945         * because it is not possible to turn a process ID into a process
 946         * handle after the process terminated.
 947         * Keep the handle in a list for waitpid.
 948         */
 949        EnterCriticalSection(&pinfo_cs);
 950        {
 951                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 952                info->pid = pi.dwProcessId;
 953                info->proc = pi.hProcess;
 954                info->next = pinfo;
 955                pinfo = info;
 956        }
 957        LeaveCriticalSection(&pinfo_cs);
 958
 959        return (pid_t)pi.dwProcessId;
 960}
 961
 962static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 963                           int prepend_cmd)
 964{
 965        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 966}
 967
 968pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 969                     const char *dir,
 970                     int fhin, int fhout, int fherr)
 971{
 972        pid_t pid;
 973        char **path = get_path_split();
 974        char *prog = path_lookup(cmd, path, 0);
 975
 976        if (!prog) {
 977                errno = ENOENT;
 978                pid = -1;
 979        }
 980        else {
 981                const char *interpr = parse_interpreter(prog);
 982
 983                if (interpr) {
 984                        const char *argv0 = argv[0];
 985                        char *iprog = path_lookup(interpr, path, 1);
 986                        argv[0] = prog;
 987                        if (!iprog) {
 988                                errno = ENOENT;
 989                                pid = -1;
 990                        }
 991                        else {
 992                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 993                                                       fhin, fhout, fherr);
 994                                free(iprog);
 995                        }
 996                        argv[0] = argv0;
 997                }
 998                else
 999                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
1000                                               fhin, fhout, fherr);
1001                free(prog);
1002        }
1003        free_path_split(path);
1004        return pid;
1005}
1006
1007static int try_shell_exec(const char *cmd, char *const *argv, char **env)
1008{
1009        const char *interpr = parse_interpreter(cmd);
1010        char **path;
1011        char *prog;
1012        int pid = 0;
1013
1014        if (!interpr)
1015                return 0;
1016        path = get_path_split();
1017        prog = path_lookup(interpr, path, 1);
1018        if (prog) {
1019                int argc = 0;
1020                const char **argv2;
1021                while (argv[argc]) argc++;
1022                argv2 = xmalloc(sizeof(*argv) * (argc+1));
1023                argv2[0] = (char *)cmd; /* full path to the script file */
1024                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1025                pid = mingw_spawnve(prog, argv2, env, 1);
1026                if (pid >= 0) {
1027                        int status;
1028                        if (waitpid(pid, &status, 0) < 0)
1029                                status = 255;
1030                        exit(status);
1031                }
1032                pid = 1;        /* indicate that we tried but failed */
1033                free(prog);
1034                free(argv2);
1035        }
1036        free_path_split(path);
1037        return pid;
1038}
1039
1040static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1041{
1042        /* check if git_command is a shell script */
1043        if (!try_shell_exec(cmd, argv, (char **)env)) {
1044                int pid, status;
1045
1046                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1047                if (pid < 0)
1048                        return;
1049                if (waitpid(pid, &status, 0) < 0)
1050                        status = 255;
1051                exit(status);
1052        }
1053}
1054
1055int mingw_execvp(const char *cmd, char *const *argv)
1056{
1057        char **path = get_path_split();
1058        char *prog = path_lookup(cmd, path, 0);
1059
1060        if (prog) {
1061                mingw_execve(prog, argv, environ);
1062                free(prog);
1063        } else
1064                errno = ENOENT;
1065
1066        free_path_split(path);
1067        return -1;
1068}
1069
1070int mingw_execv(const char *cmd, char *const *argv)
1071{
1072        mingw_execve(cmd, argv, environ);
1073        return -1;
1074}
1075
1076int mingw_kill(pid_t pid, int sig)
1077{
1078        if (pid > 0 && sig == SIGTERM) {
1079                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1080
1081                if (TerminateProcess(h, -1)) {
1082                        CloseHandle(h);
1083                        return 0;
1084                }
1085
1086                errno = err_win_to_posix(GetLastError());
1087                CloseHandle(h);
1088                return -1;
1089        }
1090
1091        errno = EINVAL;
1092        return -1;
1093}
1094
1095static char **copy_environ(void)
1096{
1097        char **env;
1098        int i = 0;
1099        while (environ[i])
1100                i++;
1101        env = xmalloc((i+1)*sizeof(*env));
1102        for (i = 0; environ[i]; i++)
1103                env[i] = xstrdup(environ[i]);
1104        env[i] = NULL;
1105        return env;
1106}
1107
1108void free_environ(char **env)
1109{
1110        int i;
1111        for (i = 0; env[i]; i++)
1112                free(env[i]);
1113        free(env);
1114}
1115
1116static int lookup_env(char **env, const char *name, size_t nmln)
1117{
1118        int i;
1119
1120        for (i = 0; env[i]; i++) {
1121                if (0 == strncmp(env[i], name, nmln)
1122                    && '=' == env[i][nmln])
1123                        /* matches */
1124                        return i;
1125        }
1126        return -1;
1127}
1128
1129/*
1130 * If name contains '=', then sets the variable, otherwise it unsets it
1131 */
1132static char **env_setenv(char **env, const char *name)
1133{
1134        char *eq = strchrnul(name, '=');
1135        int i = lookup_env(env, name, eq-name);
1136
1137        if (i < 0) {
1138                if (*eq) {
1139                        for (i = 0; env[i]; i++)
1140                                ;
1141                        env = xrealloc(env, (i+2)*sizeof(*env));
1142                        env[i] = xstrdup(name);
1143                        env[i+1] = NULL;
1144                }
1145        }
1146        else {
1147                free(env[i]);
1148                if (*eq)
1149                        env[i] = xstrdup(name);
1150                else
1151                        for (; env[i]; i++)
1152                                env[i] = env[i+1];
1153        }
1154        return env;
1155}
1156
1157/*
1158 * Copies global environ and adjusts variables as specified by vars.
1159 */
1160char **make_augmented_environ(const char *const *vars)
1161{
1162        char **env = copy_environ();
1163
1164        while (*vars)
1165                env = env_setenv(env, *vars++);
1166        return env;
1167}
1168
1169#undef getenv
1170
1171/*
1172 * The system's getenv looks up the name in a case-insensitive manner.
1173 * This version tries a case-sensitive lookup and falls back to
1174 * case-insensitive if nothing was found.  This is necessary because,
1175 * as a prominent example, CMD sets 'Path', but not 'PATH'.
1176 * Warning: not thread-safe.
1177 */
1178static char *getenv_cs(const char *name)
1179{
1180        size_t len = strlen(name);
1181        int i = lookup_env(environ, name, len);
1182        if (i >= 0)
1183                return environ[i] + len + 1;    /* skip past name and '=' */
1184        return getenv(name);
1185}
1186
1187char *mingw_getenv(const char *name)
1188{
1189        char *result = getenv_cs(name);
1190        if (!result && !strcmp(name, "TMPDIR")) {
1191                /* on Windows it is TMP and TEMP */
1192                result = getenv_cs("TMP");
1193                if (!result)
1194                        result = getenv_cs("TEMP");
1195        }
1196        return result;
1197}
1198
1199/*
1200 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1201 * that service contains a numerical port, or that it is null. It
1202 * does a simple search using gethostbyname, and returns one IPv4 host
1203 * if one was found.
1204 */
1205static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1206                                   const struct addrinfo *hints,
1207                                   struct addrinfo **res)
1208{
1209        struct hostent *h = NULL;
1210        struct addrinfo *ai;
1211        struct sockaddr_in *sin;
1212
1213        if (node) {
1214                h = gethostbyname(node);
1215                if (!h)
1216                        return WSAGetLastError();
1217        }
1218
1219        ai = xmalloc(sizeof(struct addrinfo));
1220        *res = ai;
1221        ai->ai_flags = 0;
1222        ai->ai_family = AF_INET;
1223        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1224        switch (ai->ai_socktype) {
1225        case SOCK_STREAM:
1226                ai->ai_protocol = IPPROTO_TCP;
1227                break;
1228        case SOCK_DGRAM:
1229                ai->ai_protocol = IPPROTO_UDP;
1230                break;
1231        default:
1232                ai->ai_protocol = 0;
1233                break;
1234        }
1235        ai->ai_addrlen = sizeof(struct sockaddr_in);
1236        if (hints && (hints->ai_flags & AI_CANONNAME))
1237                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1238        else
1239                ai->ai_canonname = NULL;
1240
1241        sin = xmalloc(ai->ai_addrlen);
1242        memset(sin, 0, ai->ai_addrlen);
1243        sin->sin_family = AF_INET;
1244        /* Note: getaddrinfo is supposed to allow service to be a string,
1245         * which should be looked up using getservbyname. This is
1246         * currently not implemented */
1247        if (service)
1248                sin->sin_port = htons(atoi(service));
1249        if (h)
1250                sin->sin_addr = *(struct in_addr *)h->h_addr;
1251        else if (hints && (hints->ai_flags & AI_PASSIVE))
1252                sin->sin_addr.s_addr = INADDR_ANY;
1253        else
1254                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1255        ai->ai_addr = (struct sockaddr *)sin;
1256        ai->ai_next = 0;
1257        return 0;
1258}
1259
1260static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1261{
1262        free(res->ai_canonname);
1263        free(res->ai_addr);
1264        free(res);
1265}
1266
1267static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1268                                   char *host, DWORD hostlen,
1269                                   char *serv, DWORD servlen, int flags)
1270{
1271        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1272        if (sa->sa_family != AF_INET)
1273                return EAI_FAMILY;
1274        if (!host && !serv)
1275                return EAI_NONAME;
1276
1277        if (host && hostlen > 0) {
1278                struct hostent *ent = NULL;
1279                if (!(flags & NI_NUMERICHOST))
1280                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1281                                            sizeof(sin->sin_addr), AF_INET);
1282
1283                if (ent)
1284                        snprintf(host, hostlen, "%s", ent->h_name);
1285                else if (flags & NI_NAMEREQD)
1286                        return EAI_NONAME;
1287                else
1288                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1289        }
1290
1291        if (serv && servlen > 0) {
1292                struct servent *ent = NULL;
1293                if (!(flags & NI_NUMERICSERV))
1294                        ent = getservbyport(sin->sin_port,
1295                                            flags & NI_DGRAM ? "udp" : "tcp");
1296
1297                if (ent)
1298                        snprintf(serv, servlen, "%s", ent->s_name);
1299                else
1300                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1301        }
1302
1303        return 0;
1304}
1305
1306static HMODULE ipv6_dll = NULL;
1307static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1308static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1309                                      const struct addrinfo *hints,
1310                                      struct addrinfo **res);
1311static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1312                                      char *host, DWORD hostlen,
1313                                      char *serv, DWORD servlen, int flags);
1314/*
1315 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1316 * don't need to try to load that one dynamically.
1317 */
1318
1319static void socket_cleanup(void)
1320{
1321        WSACleanup();
1322        if (ipv6_dll)
1323                FreeLibrary(ipv6_dll);
1324        ipv6_dll = NULL;
1325        ipv6_freeaddrinfo = freeaddrinfo_stub;
1326        ipv6_getaddrinfo = getaddrinfo_stub;
1327        ipv6_getnameinfo = getnameinfo_stub;
1328}
1329
1330static void ensure_socket_initialization(void)
1331{
1332        WSADATA wsa;
1333        static int initialized = 0;
1334        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1335        const char **name;
1336
1337        if (initialized)
1338                return;
1339
1340        if (WSAStartup(MAKEWORD(2,2), &wsa))
1341                die("unable to initialize winsock subsystem, error %d",
1342                        WSAGetLastError());
1343
1344        for (name = libraries; *name; name++) {
1345                ipv6_dll = LoadLibrary(*name);
1346                if (!ipv6_dll)
1347                        continue;
1348
1349                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1350                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1351                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1352                                                   const struct addrinfo *,
1353                                                   struct addrinfo **))
1354                        GetProcAddress(ipv6_dll, "getaddrinfo");
1355                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1356                                                   socklen_t, char *, DWORD,
1357                                                   char *, DWORD, int))
1358                        GetProcAddress(ipv6_dll, "getnameinfo");
1359                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1360                        FreeLibrary(ipv6_dll);
1361                        ipv6_dll = NULL;
1362                } else
1363                        break;
1364        }
1365        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1366                ipv6_freeaddrinfo = freeaddrinfo_stub;
1367                ipv6_getaddrinfo = getaddrinfo_stub;
1368                ipv6_getnameinfo = getnameinfo_stub;
1369        }
1370
1371        atexit(socket_cleanup);
1372        initialized = 1;
1373}
1374
1375#undef gethostname
1376int mingw_gethostname(char *name, int namelen)
1377{
1378    ensure_socket_initialization();
1379    return gethostname(name, namelen);
1380}
1381
1382#undef gethostbyname
1383struct hostent *mingw_gethostbyname(const char *host)
1384{
1385        ensure_socket_initialization();
1386        return gethostbyname(host);
1387}
1388
1389void mingw_freeaddrinfo(struct addrinfo *res)
1390{
1391        ipv6_freeaddrinfo(res);
1392}
1393
1394int mingw_getaddrinfo(const char *node, const char *service,
1395                      const struct addrinfo *hints, struct addrinfo **res)
1396{
1397        ensure_socket_initialization();
1398        return ipv6_getaddrinfo(node, service, hints, res);
1399}
1400
1401int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1402                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1403                      int flags)
1404{
1405        ensure_socket_initialization();
1406        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1407}
1408
1409int mingw_socket(int domain, int type, int protocol)
1410{
1411        int sockfd;
1412        SOCKET s;
1413
1414        ensure_socket_initialization();
1415        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1416        if (s == INVALID_SOCKET) {
1417                /*
1418                 * WSAGetLastError() values are regular BSD error codes
1419                 * biased by WSABASEERR.
1420                 * However, strerror() does not know about networking
1421                 * specific errors, which are values beginning at 38 or so.
1422                 * Therefore, we choose to leave the biased error code
1423                 * in errno so that _if_ someone looks up the code somewhere,
1424                 * then it is at least the number that are usually listed.
1425                 */
1426                errno = WSAGetLastError();
1427                return -1;
1428        }
1429        /* convert into a file descriptor */
1430        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1431                closesocket(s);
1432                return error("unable to make a socket file descriptor: %s",
1433                        strerror(errno));
1434        }
1435        return sockfd;
1436}
1437
1438#undef connect
1439int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1440{
1441        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1442        return connect(s, sa, sz);
1443}
1444
1445#undef bind
1446int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1447{
1448        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1449        return bind(s, sa, sz);
1450}
1451
1452#undef setsockopt
1453int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1454{
1455        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1456        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1457}
1458
1459#undef shutdown
1460int mingw_shutdown(int sockfd, int how)
1461{
1462        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1463        return shutdown(s, how);
1464}
1465
1466#undef listen
1467int mingw_listen(int sockfd, int backlog)
1468{
1469        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1470        return listen(s, backlog);
1471}
1472
1473#undef accept
1474int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1475{
1476        int sockfd2;
1477
1478        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1479        SOCKET s2 = accept(s1, sa, sz);
1480
1481        /* convert into a file descriptor */
1482        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1483                int err = errno;
1484                closesocket(s2);
1485                return error("unable to make a socket file descriptor: %s",
1486                        strerror(err));
1487        }
1488        return sockfd2;
1489}
1490
1491#undef rename
1492int mingw_rename(const char *pold, const char *pnew)
1493{
1494        DWORD attrs, gle;
1495        int tries = 0;
1496
1497        /*
1498         * Try native rename() first to get errno right.
1499         * It is based on MoveFile(), which cannot overwrite existing files.
1500         */
1501        if (!rename(pold, pnew))
1502                return 0;
1503        if (errno != EEXIST)
1504                return -1;
1505repeat:
1506        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1507                return 0;
1508        /* TODO: translate more errors */
1509        gle = GetLastError();
1510        if (gle == ERROR_ACCESS_DENIED &&
1511            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1512                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1513                        errno = EISDIR;
1514                        return -1;
1515                }
1516                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1517                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1518                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1519                                return 0;
1520                        gle = GetLastError();
1521                        /* revert file attributes on failure */
1522                        SetFileAttributes(pnew, attrs);
1523                }
1524        }
1525        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1526                /*
1527                 * We assume that some other process had the source or
1528                 * destination file open at the wrong moment and retry.
1529                 * In order to give the other process a higher chance to
1530                 * complete its operation, we give up our time slice now.
1531                 * If we have to retry again, we do sleep a bit.
1532                 */
1533                Sleep(delay[tries]);
1534                tries++;
1535                goto repeat;
1536        }
1537        if (gle == ERROR_ACCESS_DENIED &&
1538               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1539                       "Should I try again?", pold, pnew))
1540                goto repeat;
1541
1542        errno = EACCES;
1543        return -1;
1544}
1545
1546/*
1547 * Note that this doesn't return the actual pagesize, but
1548 * the allocation granularity. If future Windows specific git code
1549 * needs the real getpagesize function, we need to find another solution.
1550 */
1551int mingw_getpagesize(void)
1552{
1553        SYSTEM_INFO si;
1554        GetSystemInfo(&si);
1555        return si.dwAllocationGranularity;
1556}
1557
1558struct passwd *getpwuid(int uid)
1559{
1560        static char user_name[100];
1561        static struct passwd p;
1562
1563        DWORD len = sizeof(user_name);
1564        if (!GetUserName(user_name, &len))
1565                return NULL;
1566        p.pw_name = user_name;
1567        p.pw_gecos = "unknown";
1568        p.pw_dir = NULL;
1569        return &p;
1570}
1571
1572static HANDLE timer_event;
1573static HANDLE timer_thread;
1574static int timer_interval;
1575static int one_shot;
1576static sig_handler_t timer_fn = SIG_DFL, sigint_fn = SIG_DFL;
1577
1578/* The timer works like this:
1579 * The thread, ticktack(), is a trivial routine that most of the time
1580 * only waits to receive the signal to terminate. The main thread tells
1581 * the thread to terminate by setting the timer_event to the signalled
1582 * state.
1583 * But ticktack() interrupts the wait state after the timer's interval
1584 * length to call the signal handler.
1585 */
1586
1587static unsigned __stdcall ticktack(void *dummy)
1588{
1589        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1590                mingw_raise(SIGALRM);
1591                if (one_shot)
1592                        break;
1593        }
1594        return 0;
1595}
1596
1597static int start_timer_thread(void)
1598{
1599        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1600        if (timer_event) {
1601                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1602                if (!timer_thread )
1603                        return errno = ENOMEM,
1604                                error("cannot start timer thread");
1605        } else
1606                return errno = ENOMEM,
1607                        error("cannot allocate resources for timer");
1608        return 0;
1609}
1610
1611static void stop_timer_thread(void)
1612{
1613        if (timer_event)
1614                SetEvent(timer_event);  /* tell thread to terminate */
1615        if (timer_thread) {
1616                int rc = WaitForSingleObject(timer_thread, 1000);
1617                if (rc == WAIT_TIMEOUT)
1618                        error("timer thread did not terminate timely");
1619                else if (rc != WAIT_OBJECT_0)
1620                        error("waiting for timer thread failed: %lu",
1621                              GetLastError());
1622                CloseHandle(timer_thread);
1623        }
1624        if (timer_event)
1625                CloseHandle(timer_event);
1626        timer_event = NULL;
1627        timer_thread = NULL;
1628}
1629
1630static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1631{
1632        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1633}
1634
1635int setitimer(int type, struct itimerval *in, struct itimerval *out)
1636{
1637        static const struct timeval zero;
1638        static int atexit_done;
1639
1640        if (out != NULL)
1641                return errno = EINVAL,
1642                        error("setitimer param 3 != NULL not implemented");
1643        if (!is_timeval_eq(&in->it_interval, &zero) &&
1644            !is_timeval_eq(&in->it_interval, &in->it_value))
1645                return errno = EINVAL,
1646                        error("setitimer: it_interval must be zero or eq it_value");
1647
1648        if (timer_thread)
1649                stop_timer_thread();
1650
1651        if (is_timeval_eq(&in->it_value, &zero) &&
1652            is_timeval_eq(&in->it_interval, &zero))
1653                return 0;
1654
1655        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1656        one_shot = is_timeval_eq(&in->it_interval, &zero);
1657        if (!atexit_done) {
1658                atexit(stop_timer_thread);
1659                atexit_done = 1;
1660        }
1661        return start_timer_thread();
1662}
1663
1664int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1665{
1666        if (sig != SIGALRM)
1667                return errno = EINVAL,
1668                        error("sigaction only implemented for SIGALRM");
1669        if (out != NULL)
1670                return errno = EINVAL,
1671                        error("sigaction: param 3 != NULL not implemented");
1672
1673        timer_fn = in->sa_handler;
1674        return 0;
1675}
1676
1677#undef signal
1678sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1679{
1680        sig_handler_t old = timer_fn;
1681
1682        switch (sig) {
1683        case SIGALRM:
1684                timer_fn = handler;
1685                break;
1686
1687        case SIGINT:
1688                sigint_fn = handler;
1689                break;
1690
1691        default:
1692                return signal(sig, handler);
1693        }
1694
1695        return old;
1696}
1697
1698#undef raise
1699int mingw_raise(int sig)
1700{
1701        switch (sig) {
1702        case SIGALRM:
1703                if (timer_fn == SIG_DFL) {
1704                        if (isatty(STDERR_FILENO))
1705                                fputs("Alarm clock\n", stderr);
1706                        exit(128 + SIGALRM);
1707                } else if (timer_fn != SIG_IGN)
1708                        timer_fn(SIGALRM);
1709                return 0;
1710
1711        case SIGINT:
1712                if (sigint_fn == SIG_DFL)
1713                        exit(128 + SIGINT);
1714                else if (sigint_fn != SIG_IGN)
1715                        sigint_fn(SIGINT);
1716                return 0;
1717
1718        default:
1719                return raise(sig);
1720        }
1721}
1722
1723
1724static const char *make_backslash_path(const char *path)
1725{
1726        static char buf[PATH_MAX + 1];
1727        char *c;
1728
1729        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1730                die("Too long path: %.*s", 60, path);
1731
1732        for (c = buf; *c; c++) {
1733                if (*c == '/')
1734                        *c = '\\';
1735        }
1736        return buf;
1737}
1738
1739void mingw_open_html(const char *unixpath)
1740{
1741        const char *htmlpath = make_backslash_path(unixpath);
1742        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1743                        const char *, const char *, const char *, INT);
1744        T ShellExecute;
1745        HMODULE shell32;
1746        int r;
1747
1748        shell32 = LoadLibrary("shell32.dll");
1749        if (!shell32)
1750                die("cannot load shell32.dll");
1751        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1752        if (!ShellExecute)
1753                die("cannot run browser");
1754
1755        printf("Launching default browser to display HTML ...\n");
1756        r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1757        FreeLibrary(shell32);
1758        /* see the MSDN documentation referring to the result codes here */
1759        if (r <= 32) {
1760                die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1761        }
1762}
1763
1764int link(const char *oldpath, const char *newpath)
1765{
1766        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1767        static T create_hard_link = NULL;
1768        if (!create_hard_link) {
1769                create_hard_link = (T) GetProcAddress(
1770                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1771                if (!create_hard_link)
1772                        create_hard_link = (T)-1;
1773        }
1774        if (create_hard_link == (T)-1) {
1775                errno = ENOSYS;
1776                return -1;
1777        }
1778        if (!create_hard_link(newpath, oldpath, NULL)) {
1779                errno = err_win_to_posix(GetLastError());
1780                return -1;
1781        }
1782        return 0;
1783}
1784
1785pid_t waitpid(pid_t pid, int *status, int options)
1786{
1787        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1788            FALSE, pid);
1789        if (!h) {
1790                errno = ECHILD;
1791                return -1;
1792        }
1793
1794        if (pid > 0 && options & WNOHANG) {
1795                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1796                        CloseHandle(h);
1797                        return 0;
1798                }
1799                options &= ~WNOHANG;
1800        }
1801
1802        if (options == 0) {
1803                struct pinfo_t **ppinfo;
1804                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1805                        CloseHandle(h);
1806                        return 0;
1807                }
1808
1809                if (status)
1810                        GetExitCodeProcess(h, (LPDWORD)status);
1811
1812                EnterCriticalSection(&pinfo_cs);
1813
1814                ppinfo = &pinfo;
1815                while (*ppinfo) {
1816                        struct pinfo_t *info = *ppinfo;
1817                        if (info->pid == pid) {
1818                                CloseHandle(info->proc);
1819                                *ppinfo = info->next;
1820                                free(info);
1821                                break;
1822                        }
1823                        ppinfo = &info->next;
1824                }
1825
1826                LeaveCriticalSection(&pinfo_cs);
1827
1828                CloseHandle(h);
1829                return pid;
1830        }
1831        CloseHandle(h);
1832
1833        errno = EINVAL;
1834        return -1;
1835}