Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit mingw_rmdir: do not prompt for retry when non-empty (a83b2b5)
   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
 324#undef fopen
 325FILE *mingw_fopen (const char *filename, const char *otype)
 326{
 327        if (filename && !strcmp(filename, "/dev/null"))
 328                filename = "nul";
 329        return fopen(filename, otype);
 330}
 331
 332#undef freopen
 333FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 334{
 335        if (filename && !strcmp(filename, "/dev/null"))
 336                filename = "nul";
 337        return freopen(filename, otype, stream);
 338}
 339
 340#undef fflush
 341int mingw_fflush(FILE *stream)
 342{
 343        int ret = fflush(stream);
 344
 345        /*
 346         * write() is used behind the scenes of stdio output functions.
 347         * Since git code does not check for errors after each stdio write
 348         * operation, it can happen that write() is called by a later
 349         * stdio function even if an earlier write() call failed. In the
 350         * case of a pipe whose readable end was closed, only the first
 351         * call to write() reports EPIPE on Windows. Subsequent write()
 352         * calls report EINVAL. It is impossible to notice whether this
 353         * fflush invocation triggered such a case, therefore, we have to
 354         * catch all EINVAL errors whole-sale.
 355         */
 356        if (ret && errno == EINVAL)
 357                errno = EPIPE;
 358
 359        return ret;
 360}
 361
 362/*
 363 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 364 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 365 */
 366static inline long long filetime_to_hnsec(const FILETIME *ft)
 367{
 368        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 369        /* Windows to Unix Epoch conversion */
 370        return winTime - 116444736000000000LL;
 371}
 372
 373static inline time_t filetime_to_time_t(const FILETIME *ft)
 374{
 375        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 376}
 377
 378/* We keep the do_lstat code in a separate function to avoid recursion.
 379 * When a path ends with a slash, the stat will fail with ENOENT. In
 380 * this case, we strip the trailing slashes and stat again.
 381 *
 382 * If follow is true then act like stat() and report on the link
 383 * target. Otherwise report on the link itself.
 384 */
 385static int do_lstat(int follow, const char *file_name, struct stat *buf)
 386{
 387        int err;
 388        WIN32_FILE_ATTRIBUTE_DATA fdata;
 389
 390        if (!(err = get_file_attr(file_name, &fdata))) {
 391                buf->st_ino = 0;
 392                buf->st_gid = 0;
 393                buf->st_uid = 0;
 394                buf->st_nlink = 1;
 395                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 396                buf->st_size = fdata.nFileSizeLow |
 397                        (((off_t)fdata.nFileSizeHigh)<<32);
 398                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 399                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 400                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 401                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 402                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 403                        WIN32_FIND_DATAA findbuf;
 404                        HANDLE handle = FindFirstFileA(file_name, &findbuf);
 405                        if (handle != INVALID_HANDLE_VALUE) {
 406                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 407                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 408                                        if (follow) {
 409                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 410                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 411                                        } else {
 412                                                buf->st_mode = S_IFLNK;
 413                                        }
 414                                        buf->st_mode |= S_IREAD;
 415                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 416                                                buf->st_mode |= S_IWRITE;
 417                                }
 418                                FindClose(handle);
 419                        }
 420                }
 421                return 0;
 422        }
 423        errno = err;
 424        return -1;
 425}
 426
 427/* We provide our own lstat/fstat functions, since the provided
 428 * lstat/fstat functions are so slow. These stat functions are
 429 * tailored for Git's usage (read: fast), and are not meant to be
 430 * complete. Note that Git stat()s are redirected to mingw_lstat()
 431 * too, since Windows doesn't really handle symlinks that well.
 432 */
 433static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 434{
 435        int namelen;
 436        static char alt_name[PATH_MAX];
 437
 438        if (!do_lstat(follow, file_name, buf))
 439                return 0;
 440
 441        /* if file_name ended in a '/', Windows returned ENOENT;
 442         * try again without trailing slashes
 443         */
 444        if (errno != ENOENT)
 445                return -1;
 446
 447        namelen = strlen(file_name);
 448        if (namelen && file_name[namelen-1] != '/')
 449                return -1;
 450        while (namelen && file_name[namelen-1] == '/')
 451                --namelen;
 452        if (!namelen || namelen >= PATH_MAX)
 453                return -1;
 454
 455        memcpy(alt_name, file_name, namelen);
 456        alt_name[namelen] = 0;
 457        return do_lstat(follow, alt_name, buf);
 458}
 459
 460int mingw_lstat(const char *file_name, struct stat *buf)
 461{
 462        return do_stat_internal(0, file_name, buf);
 463}
 464int mingw_stat(const char *file_name, struct stat *buf)
 465{
 466        return do_stat_internal(1, file_name, buf);
 467}
 468
 469#undef fstat
 470int mingw_fstat(int fd, struct stat *buf)
 471{
 472        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 473        BY_HANDLE_FILE_INFORMATION fdata;
 474
 475        if (fh == INVALID_HANDLE_VALUE) {
 476                errno = EBADF;
 477                return -1;
 478        }
 479        /* direct non-file handles to MS's fstat() */
 480        if (GetFileType(fh) != FILE_TYPE_DISK)
 481                return _fstati64(fd, buf);
 482
 483        if (GetFileInformationByHandle(fh, &fdata)) {
 484                buf->st_ino = 0;
 485                buf->st_gid = 0;
 486                buf->st_uid = 0;
 487                buf->st_nlink = 1;
 488                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 489                buf->st_size = fdata.nFileSizeLow |
 490                        (((off_t)fdata.nFileSizeHigh)<<32);
 491                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 492                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 493                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 494                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 495                return 0;
 496        }
 497        errno = EBADF;
 498        return -1;
 499}
 500
 501static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 502{
 503        long long winTime = t * 10000000LL + 116444736000000000LL;
 504        ft->dwLowDateTime = winTime;
 505        ft->dwHighDateTime = winTime >> 32;
 506}
 507
 508int mingw_utime (const char *file_name, const struct utimbuf *times)
 509{
 510        FILETIME mft, aft;
 511        int fh, rc;
 512
 513        /* must have write permission */
 514        DWORD attrs = GetFileAttributes(file_name);
 515        if (attrs != INVALID_FILE_ATTRIBUTES &&
 516            (attrs & FILE_ATTRIBUTE_READONLY)) {
 517                /* ignore errors here; open() will report them */
 518                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 519        }
 520
 521        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 522                rc = -1;
 523                goto revert_attrs;
 524        }
 525
 526        if (times) {
 527                time_t_to_filetime(times->modtime, &mft);
 528                time_t_to_filetime(times->actime, &aft);
 529        } else {
 530                GetSystemTimeAsFileTime(&mft);
 531                aft = mft;
 532        }
 533        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 534                errno = EINVAL;
 535                rc = -1;
 536        } else
 537                rc = 0;
 538        close(fh);
 539
 540revert_attrs:
 541        if (attrs != INVALID_FILE_ATTRIBUTES &&
 542            (attrs & FILE_ATTRIBUTE_READONLY)) {
 543                /* ignore errors again */
 544                SetFileAttributes(file_name, attrs);
 545        }
 546        return rc;
 547}
 548
 549unsigned int sleep (unsigned int seconds)
 550{
 551        Sleep(seconds*1000);
 552        return 0;
 553}
 554
 555int mkstemp(char *template)
 556{
 557        char *filename = mktemp(template);
 558        if (filename == NULL)
 559                return -1;
 560        return open(filename, O_RDWR | O_CREAT, 0600);
 561}
 562
 563int gettimeofday(struct timeval *tv, void *tz)
 564{
 565        FILETIME ft;
 566        long long hnsec;
 567
 568        GetSystemTimeAsFileTime(&ft);
 569        hnsec = filetime_to_hnsec(&ft);
 570        tv->tv_sec = hnsec / 10000000;
 571        tv->tv_usec = (hnsec % 10000000) / 10;
 572        return 0;
 573}
 574
 575int pipe(int filedes[2])
 576{
 577        HANDLE h[2];
 578
 579        /* this creates non-inheritable handles */
 580        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 581                errno = err_win_to_posix(GetLastError());
 582                return -1;
 583        }
 584        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 585        if (filedes[0] < 0) {
 586                CloseHandle(h[0]);
 587                CloseHandle(h[1]);
 588                return -1;
 589        }
 590        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 591        if (filedes[0] < 0) {
 592                close(filedes[0]);
 593                CloseHandle(h[1]);
 594                return -1;
 595        }
 596        return 0;
 597}
 598
 599struct tm *gmtime_r(const time_t *timep, struct tm *result)
 600{
 601        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 602        memcpy(result, gmtime(timep), sizeof(struct tm));
 603        return result;
 604}
 605
 606struct tm *localtime_r(const time_t *timep, struct tm *result)
 607{
 608        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 609        memcpy(result, localtime(timep), sizeof(struct tm));
 610        return result;
 611}
 612
 613#undef getcwd
 614char *mingw_getcwd(char *pointer, int len)
 615{
 616        int i;
 617        char *ret = getcwd(pointer, len);
 618        if (!ret)
 619                return ret;
 620        for (i = 0; pointer[i]; i++)
 621                if (pointer[i] == '\\')
 622                        pointer[i] = '/';
 623        return ret;
 624}
 625
 626/*
 627 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 628 * (Parsing C++ Command-Line Arguments)
 629 */
 630static const char *quote_arg(const char *arg)
 631{
 632        /* count chars to quote */
 633        int len = 0, n = 0;
 634        int force_quotes = 0;
 635        char *q, *d;
 636        const char *p = arg;
 637        if (!*p) force_quotes = 1;
 638        while (*p) {
 639                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 640                        force_quotes = 1;
 641                else if (*p == '"')
 642                        n++;
 643                else if (*p == '\\') {
 644                        int count = 0;
 645                        while (*p == '\\') {
 646                                count++;
 647                                p++;
 648                                len++;
 649                        }
 650                        if (*p == '"')
 651                                n += count*2 + 1;
 652                        continue;
 653                }
 654                len++;
 655                p++;
 656        }
 657        if (!force_quotes && n == 0)
 658                return arg;
 659
 660        /* insert \ where necessary */
 661        d = q = xmalloc(len+n+3);
 662        *d++ = '"';
 663        while (*arg) {
 664                if (*arg == '"')
 665                        *d++ = '\\';
 666                else if (*arg == '\\') {
 667                        int count = 0;
 668                        while (*arg == '\\') {
 669                                count++;
 670                                *d++ = *arg++;
 671                        }
 672                        if (*arg == '"') {
 673                                while (count-- > 0)
 674                                        *d++ = '\\';
 675                                *d++ = '\\';
 676                        }
 677                }
 678                *d++ = *arg++;
 679        }
 680        *d++ = '"';
 681        *d++ = 0;
 682        return q;
 683}
 684
 685static const char *parse_interpreter(const char *cmd)
 686{
 687        static char buf[100];
 688        char *p, *opt;
 689        int n, fd;
 690
 691        /* don't even try a .exe */
 692        n = strlen(cmd);
 693        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 694                return NULL;
 695
 696        fd = open(cmd, O_RDONLY);
 697        if (fd < 0)
 698                return NULL;
 699        n = read(fd, buf, sizeof(buf)-1);
 700        close(fd);
 701        if (n < 4)      /* at least '#!/x' and not error */
 702                return NULL;
 703
 704        if (buf[0] != '#' || buf[1] != '!')
 705                return NULL;
 706        buf[n] = '\0';
 707        p = buf + strcspn(buf, "\r\n");
 708        if (!*p)
 709                return NULL;
 710
 711        *p = '\0';
 712        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 713                return NULL;
 714        /* strip options */
 715        if ((opt = strchr(p+1, ' ')))
 716                *opt = '\0';
 717        return p+1;
 718}
 719
 720/*
 721 * Splits the PATH into parts.
 722 */
 723static char **get_path_split(void)
 724{
 725        char *p, **path, *envpath = mingw_getenv("PATH");
 726        int i, n = 0;
 727
 728        if (!envpath || !*envpath)
 729                return NULL;
 730
 731        envpath = xstrdup(envpath);
 732        p = envpath;
 733        while (p) {
 734                char *dir = p;
 735                p = strchr(p, ';');
 736                if (p) *p++ = '\0';
 737                if (*dir) {     /* not earlier, catches series of ; */
 738                        ++n;
 739                }
 740        }
 741        if (!n)
 742                return NULL;
 743
 744        path = xmalloc((n+1)*sizeof(char *));
 745        p = envpath;
 746        i = 0;
 747        do {
 748                if (*p)
 749                        path[i++] = xstrdup(p);
 750                p = p+strlen(p)+1;
 751        } while (i < n);
 752        path[i] = NULL;
 753
 754        free(envpath);
 755
 756        return path;
 757}
 758
 759static void free_path_split(char **path)
 760{
 761        char **p = path;
 762
 763        if (!path)
 764                return;
 765
 766        while (*p)
 767                free(*p++);
 768        free(path);
 769}
 770
 771/*
 772 * exe_only means that we only want to detect .exe files, but not scripts
 773 * (which do not have an extension)
 774 */
 775static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 776{
 777        char path[MAX_PATH];
 778        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 779
 780        if (!isexe && access(path, F_OK) == 0)
 781                return xstrdup(path);
 782        path[strlen(path)-4] = '\0';
 783        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 784                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 785                        return xstrdup(path);
 786        return NULL;
 787}
 788
 789/*
 790 * Determines the absolute path of cmd using the split path in path.
 791 * If cmd contains a slash or backslash, no lookup is performed.
 792 */
 793static char *path_lookup(const char *cmd, char **path, int exe_only)
 794{
 795        char *prog = NULL;
 796        int len = strlen(cmd);
 797        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 798
 799        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 800                prog = xstrdup(cmd);
 801
 802        while (!prog && *path)
 803                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 804
 805        return prog;
 806}
 807
 808static int env_compare(const void *a, const void *b)
 809{
 810        char *const *ea = a;
 811        char *const *eb = b;
 812        return strcasecmp(*ea, *eb);
 813}
 814
 815struct pinfo_t {
 816        struct pinfo_t *next;
 817        pid_t pid;
 818        HANDLE proc;
 819} pinfo_t;
 820struct pinfo_t *pinfo = NULL;
 821CRITICAL_SECTION pinfo_cs;
 822
 823static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 824                              const char *dir,
 825                              int prepend_cmd, int fhin, int fhout, int fherr)
 826{
 827        STARTUPINFO si;
 828        PROCESS_INFORMATION pi;
 829        struct strbuf envblk, args;
 830        unsigned flags;
 831        BOOL ret;
 832
 833        /* Determine whether or not we are associated to a console */
 834        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 835                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 836                        FILE_ATTRIBUTE_NORMAL, NULL);
 837        if (cons == INVALID_HANDLE_VALUE) {
 838                /* There is no console associated with this process.
 839                 * Since the child is a console process, Windows
 840                 * would normally create a console window. But
 841                 * since we'll be redirecting std streams, we do
 842                 * not need the console.
 843                 * It is necessary to use DETACHED_PROCESS
 844                 * instead of CREATE_NO_WINDOW to make ssh
 845                 * recognize that it has no console.
 846                 */
 847                flags = DETACHED_PROCESS;
 848        } else {
 849                /* There is already a console. If we specified
 850                 * DETACHED_PROCESS here, too, Windows would
 851                 * disassociate the child from the console.
 852                 * The same is true for CREATE_NO_WINDOW.
 853                 * Go figure!
 854                 */
 855                flags = 0;
 856                CloseHandle(cons);
 857        }
 858        memset(&si, 0, sizeof(si));
 859        si.cb = sizeof(si);
 860        si.dwFlags = STARTF_USESTDHANDLES;
 861        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 862        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 863        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 864
 865        /* concatenate argv, quoting args as we go */
 866        strbuf_init(&args, 0);
 867        if (prepend_cmd) {
 868                char *quoted = (char *)quote_arg(cmd);
 869                strbuf_addstr(&args, quoted);
 870                if (quoted != cmd)
 871                        free(quoted);
 872        }
 873        for (; *argv; argv++) {
 874                char *quoted = (char *)quote_arg(*argv);
 875                if (*args.buf)
 876                        strbuf_addch(&args, ' ');
 877                strbuf_addstr(&args, quoted);
 878                if (quoted != *argv)
 879                        free(quoted);
 880        }
 881
 882        if (env) {
 883                int count = 0;
 884                char **e, **sorted_env;
 885
 886                for (e = env; *e; e++)
 887                        count++;
 888
 889                /* environment must be sorted */
 890                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 891                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 892                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 893
 894                strbuf_init(&envblk, 0);
 895                for (e = sorted_env; *e; e++) {
 896                        strbuf_addstr(&envblk, *e);
 897                        strbuf_addch(&envblk, '\0');
 898                }
 899                free(sorted_env);
 900        }
 901
 902        memset(&pi, 0, sizeof(pi));
 903        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 904                env ? envblk.buf : NULL, dir, &si, &pi);
 905
 906        if (env)
 907                strbuf_release(&envblk);
 908        strbuf_release(&args);
 909
 910        if (!ret) {
 911                errno = ENOENT;
 912                return -1;
 913        }
 914        CloseHandle(pi.hThread);
 915
 916        /*
 917         * The process ID is the human-readable identifier of the process
 918         * that we want to present in log and error messages. The handle
 919         * is not useful for this purpose. But we cannot close it, either,
 920         * because it is not possible to turn a process ID into a process
 921         * handle after the process terminated.
 922         * Keep the handle in a list for waitpid.
 923         */
 924        EnterCriticalSection(&pinfo_cs);
 925        {
 926                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 927                info->pid = pi.dwProcessId;
 928                info->proc = pi.hProcess;
 929                info->next = pinfo;
 930                pinfo = info;
 931        }
 932        LeaveCriticalSection(&pinfo_cs);
 933
 934        return (pid_t)pi.dwProcessId;
 935}
 936
 937static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 938                           int prepend_cmd)
 939{
 940        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 941}
 942
 943pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 944                     const char *dir,
 945                     int fhin, int fhout, int fherr)
 946{
 947        pid_t pid;
 948        char **path = get_path_split();
 949        char *prog = path_lookup(cmd, path, 0);
 950
 951        if (!prog) {
 952                errno = ENOENT;
 953                pid = -1;
 954        }
 955        else {
 956                const char *interpr = parse_interpreter(prog);
 957
 958                if (interpr) {
 959                        const char *argv0 = argv[0];
 960                        char *iprog = path_lookup(interpr, path, 1);
 961                        argv[0] = prog;
 962                        if (!iprog) {
 963                                errno = ENOENT;
 964                                pid = -1;
 965                        }
 966                        else {
 967                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 968                                                       fhin, fhout, fherr);
 969                                free(iprog);
 970                        }
 971                        argv[0] = argv0;
 972                }
 973                else
 974                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 975                                               fhin, fhout, fherr);
 976                free(prog);
 977        }
 978        free_path_split(path);
 979        return pid;
 980}
 981
 982static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 983{
 984        const char *interpr = parse_interpreter(cmd);
 985        char **path;
 986        char *prog;
 987        int pid = 0;
 988
 989        if (!interpr)
 990                return 0;
 991        path = get_path_split();
 992        prog = path_lookup(interpr, path, 1);
 993        if (prog) {
 994                int argc = 0;
 995                const char **argv2;
 996                while (argv[argc]) argc++;
 997                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 998                argv2[0] = (char *)cmd; /* full path to the script file */
 999                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
1000                pid = mingw_spawnve(prog, argv2, env, 1);
1001                if (pid >= 0) {
1002                        int status;
1003                        if (waitpid(pid, &status, 0) < 0)
1004                                status = 255;
1005                        exit(status);
1006                }
1007                pid = 1;        /* indicate that we tried but failed */
1008                free(prog);
1009                free(argv2);
1010        }
1011        free_path_split(path);
1012        return pid;
1013}
1014
1015static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1016{
1017        /* check if git_command is a shell script */
1018        if (!try_shell_exec(cmd, argv, (char **)env)) {
1019                int pid, status;
1020
1021                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1022                if (pid < 0)
1023                        return;
1024                if (waitpid(pid, &status, 0) < 0)
1025                        status = 255;
1026                exit(status);
1027        }
1028}
1029
1030int mingw_execvp(const char *cmd, char *const *argv)
1031{
1032        char **path = get_path_split();
1033        char *prog = path_lookup(cmd, path, 0);
1034
1035        if (prog) {
1036                mingw_execve(prog, argv, environ);
1037                free(prog);
1038        } else
1039                errno = ENOENT;
1040
1041        free_path_split(path);
1042        return -1;
1043}
1044
1045int mingw_execv(const char *cmd, char *const *argv)
1046{
1047        mingw_execve(cmd, argv, environ);
1048        return -1;
1049}
1050
1051int mingw_kill(pid_t pid, int sig)
1052{
1053        if (pid > 0 && sig == SIGTERM) {
1054                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1055
1056                if (TerminateProcess(h, -1)) {
1057                        CloseHandle(h);
1058                        return 0;
1059                }
1060
1061                errno = err_win_to_posix(GetLastError());
1062                CloseHandle(h);
1063                return -1;
1064        }
1065
1066        errno = EINVAL;
1067        return -1;
1068}
1069
1070static char **copy_environ(void)
1071{
1072        char **env;
1073        int i = 0;
1074        while (environ[i])
1075                i++;
1076        env = xmalloc((i+1)*sizeof(*env));
1077        for (i = 0; environ[i]; i++)
1078                env[i] = xstrdup(environ[i]);
1079        env[i] = NULL;
1080        return env;
1081}
1082
1083void free_environ(char **env)
1084{
1085        int i;
1086        for (i = 0; env[i]; i++)
1087                free(env[i]);
1088        free(env);
1089}
1090
1091static int lookup_env(char **env, const char *name, size_t nmln)
1092{
1093        int i;
1094
1095        for (i = 0; env[i]; i++) {
1096                if (0 == strncmp(env[i], name, nmln)
1097                    && '=' == env[i][nmln])
1098                        /* matches */
1099                        return i;
1100        }
1101        return -1;
1102}
1103
1104/*
1105 * If name contains '=', then sets the variable, otherwise it unsets it
1106 */
1107static char **env_setenv(char **env, const char *name)
1108{
1109        char *eq = strchrnul(name, '=');
1110        int i = lookup_env(env, name, eq-name);
1111
1112        if (i < 0) {
1113                if (*eq) {
1114                        for (i = 0; env[i]; i++)
1115                                ;
1116                        env = xrealloc(env, (i+2)*sizeof(*env));
1117                        env[i] = xstrdup(name);
1118                        env[i+1] = NULL;
1119                }
1120        }
1121        else {
1122                free(env[i]);
1123                if (*eq)
1124                        env[i] = xstrdup(name);
1125                else
1126                        for (; env[i]; i++)
1127                                env[i] = env[i+1];
1128        }
1129        return env;
1130}
1131
1132/*
1133 * Copies global environ and adjusts variables as specified by vars.
1134 */
1135char **make_augmented_environ(const char *const *vars)
1136{
1137        char **env = copy_environ();
1138
1139        while (*vars)
1140                env = env_setenv(env, *vars++);
1141        return env;
1142}
1143
1144#undef getenv
1145
1146/*
1147 * The system's getenv looks up the name in a case-insensitive manner.
1148 * This version tries a case-sensitive lookup and falls back to
1149 * case-insensitive if nothing was found.  This is necessary because,
1150 * as a prominent example, CMD sets 'Path', but not 'PATH'.
1151 * Warning: not thread-safe.
1152 */
1153static char *getenv_cs(const char *name)
1154{
1155        size_t len = strlen(name);
1156        int i = lookup_env(environ, name, len);
1157        if (i >= 0)
1158                return environ[i] + len + 1;    /* skip past name and '=' */
1159        return getenv(name);
1160}
1161
1162char *mingw_getenv(const char *name)
1163{
1164        char *result = getenv_cs(name);
1165        if (!result && !strcmp(name, "TMPDIR")) {
1166                /* on Windows it is TMP and TEMP */
1167                result = getenv_cs("TMP");
1168                if (!result)
1169                        result = getenv_cs("TEMP");
1170        }
1171        return result;
1172}
1173
1174/*
1175 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1176 * that service contains a numerical port, or that it is null. It
1177 * does a simple search using gethostbyname, and returns one IPv4 host
1178 * if one was found.
1179 */
1180static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1181                                   const struct addrinfo *hints,
1182                                   struct addrinfo **res)
1183{
1184        struct hostent *h = NULL;
1185        struct addrinfo *ai;
1186        struct sockaddr_in *sin;
1187
1188        if (node) {
1189                h = gethostbyname(node);
1190                if (!h)
1191                        return WSAGetLastError();
1192        }
1193
1194        ai = xmalloc(sizeof(struct addrinfo));
1195        *res = ai;
1196        ai->ai_flags = 0;
1197        ai->ai_family = AF_INET;
1198        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1199        switch (ai->ai_socktype) {
1200        case SOCK_STREAM:
1201                ai->ai_protocol = IPPROTO_TCP;
1202                break;
1203        case SOCK_DGRAM:
1204                ai->ai_protocol = IPPROTO_UDP;
1205                break;
1206        default:
1207                ai->ai_protocol = 0;
1208                break;
1209        }
1210        ai->ai_addrlen = sizeof(struct sockaddr_in);
1211        if (hints && (hints->ai_flags & AI_CANONNAME))
1212                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1213        else
1214                ai->ai_canonname = NULL;
1215
1216        sin = xmalloc(ai->ai_addrlen);
1217        memset(sin, 0, ai->ai_addrlen);
1218        sin->sin_family = AF_INET;
1219        /* Note: getaddrinfo is supposed to allow service to be a string,
1220         * which should be looked up using getservbyname. This is
1221         * currently not implemented */
1222        if (service)
1223                sin->sin_port = htons(atoi(service));
1224        if (h)
1225                sin->sin_addr = *(struct in_addr *)h->h_addr;
1226        else if (hints && (hints->ai_flags & AI_PASSIVE))
1227                sin->sin_addr.s_addr = INADDR_ANY;
1228        else
1229                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1230        ai->ai_addr = (struct sockaddr *)sin;
1231        ai->ai_next = 0;
1232        return 0;
1233}
1234
1235static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1236{
1237        free(res->ai_canonname);
1238        free(res->ai_addr);
1239        free(res);
1240}
1241
1242static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1243                                   char *host, DWORD hostlen,
1244                                   char *serv, DWORD servlen, int flags)
1245{
1246        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1247        if (sa->sa_family != AF_INET)
1248                return EAI_FAMILY;
1249        if (!host && !serv)
1250                return EAI_NONAME;
1251
1252        if (host && hostlen > 0) {
1253                struct hostent *ent = NULL;
1254                if (!(flags & NI_NUMERICHOST))
1255                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1256                                            sizeof(sin->sin_addr), AF_INET);
1257
1258                if (ent)
1259                        snprintf(host, hostlen, "%s", ent->h_name);
1260                else if (flags & NI_NAMEREQD)
1261                        return EAI_NONAME;
1262                else
1263                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1264        }
1265
1266        if (serv && servlen > 0) {
1267                struct servent *ent = NULL;
1268                if (!(flags & NI_NUMERICSERV))
1269                        ent = getservbyport(sin->sin_port,
1270                                            flags & NI_DGRAM ? "udp" : "tcp");
1271
1272                if (ent)
1273                        snprintf(serv, servlen, "%s", ent->s_name);
1274                else
1275                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1276        }
1277
1278        return 0;
1279}
1280
1281static HMODULE ipv6_dll = NULL;
1282static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1283static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1284                                      const struct addrinfo *hints,
1285                                      struct addrinfo **res);
1286static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1287                                      char *host, DWORD hostlen,
1288                                      char *serv, DWORD servlen, int flags);
1289/*
1290 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1291 * don't need to try to load that one dynamically.
1292 */
1293
1294static void socket_cleanup(void)
1295{
1296        WSACleanup();
1297        if (ipv6_dll)
1298                FreeLibrary(ipv6_dll);
1299        ipv6_dll = NULL;
1300        ipv6_freeaddrinfo = freeaddrinfo_stub;
1301        ipv6_getaddrinfo = getaddrinfo_stub;
1302        ipv6_getnameinfo = getnameinfo_stub;
1303}
1304
1305static void ensure_socket_initialization(void)
1306{
1307        WSADATA wsa;
1308        static int initialized = 0;
1309        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1310        const char **name;
1311
1312        if (initialized)
1313                return;
1314
1315        if (WSAStartup(MAKEWORD(2,2), &wsa))
1316                die("unable to initialize winsock subsystem, error %d",
1317                        WSAGetLastError());
1318
1319        for (name = libraries; *name; name++) {
1320                ipv6_dll = LoadLibrary(*name);
1321                if (!ipv6_dll)
1322                        continue;
1323
1324                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1325                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1326                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1327                                                   const struct addrinfo *,
1328                                                   struct addrinfo **))
1329                        GetProcAddress(ipv6_dll, "getaddrinfo");
1330                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1331                                                   socklen_t, char *, DWORD,
1332                                                   char *, DWORD, int))
1333                        GetProcAddress(ipv6_dll, "getnameinfo");
1334                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1335                        FreeLibrary(ipv6_dll);
1336                        ipv6_dll = NULL;
1337                } else
1338                        break;
1339        }
1340        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1341                ipv6_freeaddrinfo = freeaddrinfo_stub;
1342                ipv6_getaddrinfo = getaddrinfo_stub;
1343                ipv6_getnameinfo = getnameinfo_stub;
1344        }
1345
1346        atexit(socket_cleanup);
1347        initialized = 1;
1348}
1349
1350#undef gethostname
1351int mingw_gethostname(char *name, int namelen)
1352{
1353    ensure_socket_initialization();
1354    return gethostname(name, namelen);
1355}
1356
1357#undef gethostbyname
1358struct hostent *mingw_gethostbyname(const char *host)
1359{
1360        ensure_socket_initialization();
1361        return gethostbyname(host);
1362}
1363
1364void mingw_freeaddrinfo(struct addrinfo *res)
1365{
1366        ipv6_freeaddrinfo(res);
1367}
1368
1369int mingw_getaddrinfo(const char *node, const char *service,
1370                      const struct addrinfo *hints, struct addrinfo **res)
1371{
1372        ensure_socket_initialization();
1373        return ipv6_getaddrinfo(node, service, hints, res);
1374}
1375
1376int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1377                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1378                      int flags)
1379{
1380        ensure_socket_initialization();
1381        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1382}
1383
1384int mingw_socket(int domain, int type, int protocol)
1385{
1386        int sockfd;
1387        SOCKET s;
1388
1389        ensure_socket_initialization();
1390        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1391        if (s == INVALID_SOCKET) {
1392                /*
1393                 * WSAGetLastError() values are regular BSD error codes
1394                 * biased by WSABASEERR.
1395                 * However, strerror() does not know about networking
1396                 * specific errors, which are values beginning at 38 or so.
1397                 * Therefore, we choose to leave the biased error code
1398                 * in errno so that _if_ someone looks up the code somewhere,
1399                 * then it is at least the number that are usually listed.
1400                 */
1401                errno = WSAGetLastError();
1402                return -1;
1403        }
1404        /* convert into a file descriptor */
1405        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1406                closesocket(s);
1407                return error("unable to make a socket file descriptor: %s",
1408                        strerror(errno));
1409        }
1410        return sockfd;
1411}
1412
1413#undef connect
1414int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1415{
1416        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1417        return connect(s, sa, sz);
1418}
1419
1420#undef bind
1421int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1422{
1423        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1424        return bind(s, sa, sz);
1425}
1426
1427#undef setsockopt
1428int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1429{
1430        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1431        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1432}
1433
1434#undef shutdown
1435int mingw_shutdown(int sockfd, int how)
1436{
1437        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1438        return shutdown(s, how);
1439}
1440
1441#undef listen
1442int mingw_listen(int sockfd, int backlog)
1443{
1444        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1445        return listen(s, backlog);
1446}
1447
1448#undef accept
1449int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1450{
1451        int sockfd2;
1452
1453        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1454        SOCKET s2 = accept(s1, sa, sz);
1455
1456        /* convert into a file descriptor */
1457        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1458                int err = errno;
1459                closesocket(s2);
1460                return error("unable to make a socket file descriptor: %s",
1461                        strerror(err));
1462        }
1463        return sockfd2;
1464}
1465
1466#undef rename
1467int mingw_rename(const char *pold, const char *pnew)
1468{
1469        DWORD attrs, gle;
1470        int tries = 0;
1471
1472        /*
1473         * Try native rename() first to get errno right.
1474         * It is based on MoveFile(), which cannot overwrite existing files.
1475         */
1476        if (!rename(pold, pnew))
1477                return 0;
1478        if (errno != EEXIST)
1479                return -1;
1480repeat:
1481        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1482                return 0;
1483        /* TODO: translate more errors */
1484        gle = GetLastError();
1485        if (gle == ERROR_ACCESS_DENIED &&
1486            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1487                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1488                        errno = EISDIR;
1489                        return -1;
1490                }
1491                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1492                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1493                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1494                                return 0;
1495                        gle = GetLastError();
1496                        /* revert file attributes on failure */
1497                        SetFileAttributes(pnew, attrs);
1498                }
1499        }
1500        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1501                /*
1502                 * We assume that some other process had the source or
1503                 * destination file open at the wrong moment and retry.
1504                 * In order to give the other process a higher chance to
1505                 * complete its operation, we give up our time slice now.
1506                 * If we have to retry again, we do sleep a bit.
1507                 */
1508                Sleep(delay[tries]);
1509                tries++;
1510                goto repeat;
1511        }
1512        if (gle == ERROR_ACCESS_DENIED &&
1513               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1514                       "Should I try again?", pold, pnew))
1515                goto repeat;
1516
1517        errno = EACCES;
1518        return -1;
1519}
1520
1521/*
1522 * Note that this doesn't return the actual pagesize, but
1523 * the allocation granularity. If future Windows specific git code
1524 * needs the real getpagesize function, we need to find another solution.
1525 */
1526int mingw_getpagesize(void)
1527{
1528        SYSTEM_INFO si;
1529        GetSystemInfo(&si);
1530        return si.dwAllocationGranularity;
1531}
1532
1533struct passwd *getpwuid(int uid)
1534{
1535        static char user_name[100];
1536        static struct passwd p;
1537
1538        DWORD len = sizeof(user_name);
1539        if (!GetUserName(user_name, &len))
1540                return NULL;
1541        p.pw_name = user_name;
1542        p.pw_gecos = "unknown";
1543        p.pw_dir = NULL;
1544        return &p;
1545}
1546
1547static HANDLE timer_event;
1548static HANDLE timer_thread;
1549static int timer_interval;
1550static int one_shot;
1551static sig_handler_t timer_fn = SIG_DFL;
1552
1553/* The timer works like this:
1554 * The thread, ticktack(), is a trivial routine that most of the time
1555 * only waits to receive the signal to terminate. The main thread tells
1556 * the thread to terminate by setting the timer_event to the signalled
1557 * state.
1558 * But ticktack() interrupts the wait state after the timer's interval
1559 * length to call the signal handler.
1560 */
1561
1562static unsigned __stdcall ticktack(void *dummy)
1563{
1564        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1565                if (timer_fn == SIG_DFL)
1566                        die("Alarm");
1567                if (timer_fn != SIG_IGN)
1568                        timer_fn(SIGALRM);
1569                if (one_shot)
1570                        break;
1571        }
1572        return 0;
1573}
1574
1575static int start_timer_thread(void)
1576{
1577        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1578        if (timer_event) {
1579                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1580                if (!timer_thread )
1581                        return errno = ENOMEM,
1582                                error("cannot start timer thread");
1583        } else
1584                return errno = ENOMEM,
1585                        error("cannot allocate resources for timer");
1586        return 0;
1587}
1588
1589static void stop_timer_thread(void)
1590{
1591        if (timer_event)
1592                SetEvent(timer_event);  /* tell thread to terminate */
1593        if (timer_thread) {
1594                int rc = WaitForSingleObject(timer_thread, 1000);
1595                if (rc == WAIT_TIMEOUT)
1596                        error("timer thread did not terminate timely");
1597                else if (rc != WAIT_OBJECT_0)
1598                        error("waiting for timer thread failed: %lu",
1599                              GetLastError());
1600                CloseHandle(timer_thread);
1601        }
1602        if (timer_event)
1603                CloseHandle(timer_event);
1604        timer_event = NULL;
1605        timer_thread = NULL;
1606}
1607
1608static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1609{
1610        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1611}
1612
1613int setitimer(int type, struct itimerval *in, struct itimerval *out)
1614{
1615        static const struct timeval zero;
1616        static int atexit_done;
1617
1618        if (out != NULL)
1619                return errno = EINVAL,
1620                        error("setitimer param 3 != NULL not implemented");
1621        if (!is_timeval_eq(&in->it_interval, &zero) &&
1622            !is_timeval_eq(&in->it_interval, &in->it_value))
1623                return errno = EINVAL,
1624                        error("setitimer: it_interval must be zero or eq it_value");
1625
1626        if (timer_thread)
1627                stop_timer_thread();
1628
1629        if (is_timeval_eq(&in->it_value, &zero) &&
1630            is_timeval_eq(&in->it_interval, &zero))
1631                return 0;
1632
1633        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1634        one_shot = is_timeval_eq(&in->it_interval, &zero);
1635        if (!atexit_done) {
1636                atexit(stop_timer_thread);
1637                atexit_done = 1;
1638        }
1639        return start_timer_thread();
1640}
1641
1642int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1643{
1644        if (sig != SIGALRM)
1645                return errno = EINVAL,
1646                        error("sigaction only implemented for SIGALRM");
1647        if (out != NULL)
1648                return errno = EINVAL,
1649                        error("sigaction: param 3 != NULL not implemented");
1650
1651        timer_fn = in->sa_handler;
1652        return 0;
1653}
1654
1655#undef signal
1656sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1657{
1658        sig_handler_t old = timer_fn;
1659        if (sig != SIGALRM)
1660                return signal(sig, handler);
1661        timer_fn = handler;
1662        return old;
1663}
1664
1665static const char *make_backslash_path(const char *path)
1666{
1667        static char buf[PATH_MAX + 1];
1668        char *c;
1669
1670        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1671                die("Too long path: %.*s", 60, path);
1672
1673        for (c = buf; *c; c++) {
1674                if (*c == '/')
1675                        *c = '\\';
1676        }
1677        return buf;
1678}
1679
1680void mingw_open_html(const char *unixpath)
1681{
1682        const char *htmlpath = make_backslash_path(unixpath);
1683        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1684                        const char *, const char *, const char *, INT);
1685        T ShellExecute;
1686        HMODULE shell32;
1687        int r;
1688
1689        shell32 = LoadLibrary("shell32.dll");
1690        if (!shell32)
1691                die("cannot load shell32.dll");
1692        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1693        if (!ShellExecute)
1694                die("cannot run browser");
1695
1696        printf("Launching default browser to display HTML ...\n");
1697        r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1698        FreeLibrary(shell32);
1699        /* see the MSDN documentation referring to the result codes here */
1700        if (r <= 32) {
1701                die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1702        }
1703}
1704
1705int link(const char *oldpath, const char *newpath)
1706{
1707        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1708        static T create_hard_link = NULL;
1709        if (!create_hard_link) {
1710                create_hard_link = (T) GetProcAddress(
1711                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1712                if (!create_hard_link)
1713                        create_hard_link = (T)-1;
1714        }
1715        if (create_hard_link == (T)-1) {
1716                errno = ENOSYS;
1717                return -1;
1718        }
1719        if (!create_hard_link(newpath, oldpath, NULL)) {
1720                errno = err_win_to_posix(GetLastError());
1721                return -1;
1722        }
1723        return 0;
1724}
1725
1726char *getpass(const char *prompt)
1727{
1728        struct strbuf buf = STRBUF_INIT;
1729
1730        fputs(prompt, stderr);
1731        for (;;) {
1732                char c = _getch();
1733                if (c == '\r' || c == '\n')
1734                        break;
1735                strbuf_addch(&buf, c);
1736        }
1737        fputs("\n", stderr);
1738        return strbuf_detach(&buf, NULL);
1739}
1740
1741pid_t waitpid(pid_t pid, int *status, int options)
1742{
1743        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1744            FALSE, pid);
1745        if (!h) {
1746                errno = ECHILD;
1747                return -1;
1748        }
1749
1750        if (pid > 0 && options & WNOHANG) {
1751                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1752                        CloseHandle(h);
1753                        return 0;
1754                }
1755                options &= ~WNOHANG;
1756        }
1757
1758        if (options == 0) {
1759                struct pinfo_t **ppinfo;
1760                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1761                        CloseHandle(h);
1762                        return 0;
1763                }
1764
1765                if (status)
1766                        GetExitCodeProcess(h, (LPDWORD)status);
1767
1768                EnterCriticalSection(&pinfo_cs);
1769
1770                ppinfo = &pinfo;
1771                while (*ppinfo) {
1772                        struct pinfo_t *info = *ppinfo;
1773                        if (info->pid == pid) {
1774                                CloseHandle(info->proc);
1775                                *ppinfo = info->next;
1776                                free(info);
1777                                break;
1778                        }
1779                        ppinfo = &info->next;
1780                }
1781
1782                LeaveCriticalSection(&pinfo_cs);
1783
1784                CloseHandle(h);
1785                return pid;
1786        }
1787        CloseHandle(h);
1788
1789        errno = EINVAL;
1790        return -1;
1791}