Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit Merge branch 'sz/maint-curl-multi-timeout' (23a50a1)
   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                        break;
 260                if (!is_dir_empty(pathname)) {
 261                        errno = ENOTEMPTY;
 262                        break;
 263                }
 264                /*
 265                 * We assume that some other process had the source or
 266                 * destination file open at the wrong moment and retry.
 267                 * In order to give the other process a higher chance to
 268                 * complete its operation, we give up our time slice now.
 269                 * If we have to retry again, we do sleep a bit.
 270                 */
 271                Sleep(delay[tries]);
 272                tries++;
 273        }
 274        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 275               ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 276                        "Should I try again?", pathname))
 277               ret = rmdir(pathname);
 278        return ret;
 279}
 280
 281#undef open
 282int mingw_open (const char *filename, int oflags, ...)
 283{
 284        va_list args;
 285        unsigned mode;
 286        int fd;
 287
 288        va_start(args, oflags);
 289        mode = va_arg(args, int);
 290        va_end(args);
 291
 292        if (filename && !strcmp(filename, "/dev/null"))
 293                filename = "nul";
 294
 295        fd = open(filename, oflags, mode);
 296
 297        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 298                DWORD attrs = GetFileAttributes(filename);
 299                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 300                        errno = EISDIR;
 301        }
 302        return fd;
 303}
 304
 305#undef write
 306ssize_t mingw_write(int fd, const void *buf, size_t count)
 307{
 308        /*
 309         * While write() calls to a file on a local disk are translated
 310         * into WriteFile() calls with a maximum size of 64KB on Windows
 311         * XP and 256KB on Vista, no such cap is placed on writes to
 312         * files over the network on Windows XP.  Unfortunately, there
 313         * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 314         * bigger writes fail on Windows XP.
 315         * So we cap to a nice 31MB here to avoid write failures over
 316         * the net without changing the number of WriteFile() calls in
 317         * the local case.
 318         */
 319        return write(fd, buf, min(count, 31 * 1024 * 1024));
 320}
 321
 322#undef fopen
 323FILE *mingw_fopen (const char *filename, const char *otype)
 324{
 325        if (filename && !strcmp(filename, "/dev/null"))
 326                filename = "nul";
 327        return fopen(filename, otype);
 328}
 329
 330#undef freopen
 331FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 332{
 333        if (filename && !strcmp(filename, "/dev/null"))
 334                filename = "nul";
 335        return freopen(filename, otype, stream);
 336}
 337
 338#undef fflush
 339int mingw_fflush(FILE *stream)
 340{
 341        int ret = fflush(stream);
 342
 343        /*
 344         * write() is used behind the scenes of stdio output functions.
 345         * Since git code does not check for errors after each stdio write
 346         * operation, it can happen that write() is called by a later
 347         * stdio function even if an earlier write() call failed. In the
 348         * case of a pipe whose readable end was closed, only the first
 349         * call to write() reports EPIPE on Windows. Subsequent write()
 350         * calls report EINVAL. It is impossible to notice whether this
 351         * fflush invocation triggered such a case, therefore, we have to
 352         * catch all EINVAL errors whole-sale.
 353         */
 354        if (ret && errno == EINVAL)
 355                errno = EPIPE;
 356
 357        return ret;
 358}
 359
 360/*
 361 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 362 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 363 */
 364static inline long long filetime_to_hnsec(const FILETIME *ft)
 365{
 366        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 367        /* Windows to Unix Epoch conversion */
 368        return winTime - 116444736000000000LL;
 369}
 370
 371static inline time_t filetime_to_time_t(const FILETIME *ft)
 372{
 373        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 374}
 375
 376/* We keep the do_lstat code in a separate function to avoid recursion.
 377 * When a path ends with a slash, the stat will fail with ENOENT. In
 378 * this case, we strip the trailing slashes and stat again.
 379 *
 380 * If follow is true then act like stat() and report on the link
 381 * target. Otherwise report on the link itself.
 382 */
 383static int do_lstat(int follow, const char *file_name, struct stat *buf)
 384{
 385        int err;
 386        WIN32_FILE_ATTRIBUTE_DATA fdata;
 387
 388        if (!(err = get_file_attr(file_name, &fdata))) {
 389                buf->st_ino = 0;
 390                buf->st_gid = 0;
 391                buf->st_uid = 0;
 392                buf->st_nlink = 1;
 393                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 394                buf->st_size = fdata.nFileSizeLow |
 395                        (((off_t)fdata.nFileSizeHigh)<<32);
 396                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 397                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 398                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 399                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 400                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 401                        WIN32_FIND_DATAA findbuf;
 402                        HANDLE handle = FindFirstFileA(file_name, &findbuf);
 403                        if (handle != INVALID_HANDLE_VALUE) {
 404                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 405                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 406                                        if (follow) {
 407                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 408                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 409                                        } else {
 410                                                buf->st_mode = S_IFLNK;
 411                                        }
 412                                        buf->st_mode |= S_IREAD;
 413                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 414                                                buf->st_mode |= S_IWRITE;
 415                                }
 416                                FindClose(handle);
 417                        }
 418                }
 419                return 0;
 420        }
 421        errno = err;
 422        return -1;
 423}
 424
 425/* We provide our own lstat/fstat functions, since the provided
 426 * lstat/fstat functions are so slow. These stat functions are
 427 * tailored for Git's usage (read: fast), and are not meant to be
 428 * complete. Note that Git stat()s are redirected to mingw_lstat()
 429 * too, since Windows doesn't really handle symlinks that well.
 430 */
 431static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 432{
 433        int namelen;
 434        static char alt_name[PATH_MAX];
 435
 436        if (!do_lstat(follow, file_name, buf))
 437                return 0;
 438
 439        /* if file_name ended in a '/', Windows returned ENOENT;
 440         * try again without trailing slashes
 441         */
 442        if (errno != ENOENT)
 443                return -1;
 444
 445        namelen = strlen(file_name);
 446        if (namelen && file_name[namelen-1] != '/')
 447                return -1;
 448        while (namelen && file_name[namelen-1] == '/')
 449                --namelen;
 450        if (!namelen || namelen >= PATH_MAX)
 451                return -1;
 452
 453        memcpy(alt_name, file_name, namelen);
 454        alt_name[namelen] = 0;
 455        return do_lstat(follow, alt_name, buf);
 456}
 457
 458int mingw_lstat(const char *file_name, struct stat *buf)
 459{
 460        return do_stat_internal(0, file_name, buf);
 461}
 462int mingw_stat(const char *file_name, struct stat *buf)
 463{
 464        return do_stat_internal(1, file_name, buf);
 465}
 466
 467#undef fstat
 468int mingw_fstat(int fd, struct stat *buf)
 469{
 470        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 471        BY_HANDLE_FILE_INFORMATION fdata;
 472
 473        if (fh == INVALID_HANDLE_VALUE) {
 474                errno = EBADF;
 475                return -1;
 476        }
 477        /* direct non-file handles to MS's fstat() */
 478        if (GetFileType(fh) != FILE_TYPE_DISK)
 479                return _fstati64(fd, buf);
 480
 481        if (GetFileInformationByHandle(fh, &fdata)) {
 482                buf->st_ino = 0;
 483                buf->st_gid = 0;
 484                buf->st_uid = 0;
 485                buf->st_nlink = 1;
 486                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 487                buf->st_size = fdata.nFileSizeLow |
 488                        (((off_t)fdata.nFileSizeHigh)<<32);
 489                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 490                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 491                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 492                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 493                return 0;
 494        }
 495        errno = EBADF;
 496        return -1;
 497}
 498
 499static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 500{
 501        long long winTime = t * 10000000LL + 116444736000000000LL;
 502        ft->dwLowDateTime = winTime;
 503        ft->dwHighDateTime = winTime >> 32;
 504}
 505
 506int mingw_utime (const char *file_name, const struct utimbuf *times)
 507{
 508        FILETIME mft, aft;
 509        int fh, rc;
 510
 511        /* must have write permission */
 512        DWORD attrs = GetFileAttributes(file_name);
 513        if (attrs != INVALID_FILE_ATTRIBUTES &&
 514            (attrs & FILE_ATTRIBUTE_READONLY)) {
 515                /* ignore errors here; open() will report them */
 516                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 517        }
 518
 519        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 520                rc = -1;
 521                goto revert_attrs;
 522        }
 523
 524        if (times) {
 525                time_t_to_filetime(times->modtime, &mft);
 526                time_t_to_filetime(times->actime, &aft);
 527        } else {
 528                GetSystemTimeAsFileTime(&mft);
 529                aft = mft;
 530        }
 531        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 532                errno = EINVAL;
 533                rc = -1;
 534        } else
 535                rc = 0;
 536        close(fh);
 537
 538revert_attrs:
 539        if (attrs != INVALID_FILE_ATTRIBUTES &&
 540            (attrs & FILE_ATTRIBUTE_READONLY)) {
 541                /* ignore errors again */
 542                SetFileAttributes(file_name, attrs);
 543        }
 544        return rc;
 545}
 546
 547unsigned int sleep (unsigned int seconds)
 548{
 549        Sleep(seconds*1000);
 550        return 0;
 551}
 552
 553int mkstemp(char *template)
 554{
 555        char *filename = mktemp(template);
 556        if (filename == NULL)
 557                return -1;
 558        return open(filename, O_RDWR | O_CREAT, 0600);
 559}
 560
 561int gettimeofday(struct timeval *tv, void *tz)
 562{
 563        FILETIME ft;
 564        long long hnsec;
 565
 566        GetSystemTimeAsFileTime(&ft);
 567        hnsec = filetime_to_hnsec(&ft);
 568        tv->tv_sec = hnsec / 10000000;
 569        tv->tv_usec = (hnsec % 10000000) / 10;
 570        return 0;
 571}
 572
 573int pipe(int filedes[2])
 574{
 575        HANDLE h[2];
 576
 577        /* this creates non-inheritable handles */
 578        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 579                errno = err_win_to_posix(GetLastError());
 580                return -1;
 581        }
 582        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 583        if (filedes[0] < 0) {
 584                CloseHandle(h[0]);
 585                CloseHandle(h[1]);
 586                return -1;
 587        }
 588        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 589        if (filedes[0] < 0) {
 590                close(filedes[0]);
 591                CloseHandle(h[1]);
 592                return -1;
 593        }
 594        return 0;
 595}
 596
 597struct tm *gmtime_r(const time_t *timep, struct tm *result)
 598{
 599        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 600        memcpy(result, gmtime(timep), sizeof(struct tm));
 601        return result;
 602}
 603
 604struct tm *localtime_r(const time_t *timep, struct tm *result)
 605{
 606        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 607        memcpy(result, localtime(timep), sizeof(struct tm));
 608        return result;
 609}
 610
 611#undef getcwd
 612char *mingw_getcwd(char *pointer, int len)
 613{
 614        int i;
 615        char *ret = getcwd(pointer, len);
 616        if (!ret)
 617                return ret;
 618        for (i = 0; pointer[i]; i++)
 619                if (pointer[i] == '\\')
 620                        pointer[i] = '/';
 621        return ret;
 622}
 623
 624/*
 625 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 626 * (Parsing C++ Command-Line Arguments)
 627 */
 628static const char *quote_arg(const char *arg)
 629{
 630        /* count chars to quote */
 631        int len = 0, n = 0;
 632        int force_quotes = 0;
 633        char *q, *d;
 634        const char *p = arg;
 635        if (!*p) force_quotes = 1;
 636        while (*p) {
 637                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 638                        force_quotes = 1;
 639                else if (*p == '"')
 640                        n++;
 641                else if (*p == '\\') {
 642                        int count = 0;
 643                        while (*p == '\\') {
 644                                count++;
 645                                p++;
 646                                len++;
 647                        }
 648                        if (*p == '"')
 649                                n += count*2 + 1;
 650                        continue;
 651                }
 652                len++;
 653                p++;
 654        }
 655        if (!force_quotes && n == 0)
 656                return arg;
 657
 658        /* insert \ where necessary */
 659        d = q = xmalloc(len+n+3);
 660        *d++ = '"';
 661        while (*arg) {
 662                if (*arg == '"')
 663                        *d++ = '\\';
 664                else if (*arg == '\\') {
 665                        int count = 0;
 666                        while (*arg == '\\') {
 667                                count++;
 668                                *d++ = *arg++;
 669                        }
 670                        if (*arg == '"') {
 671                                while (count-- > 0)
 672                                        *d++ = '\\';
 673                                *d++ = '\\';
 674                        }
 675                }
 676                *d++ = *arg++;
 677        }
 678        *d++ = '"';
 679        *d++ = 0;
 680        return q;
 681}
 682
 683static const char *parse_interpreter(const char *cmd)
 684{
 685        static char buf[100];
 686        char *p, *opt;
 687        int n, fd;
 688
 689        /* don't even try a .exe */
 690        n = strlen(cmd);
 691        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 692                return NULL;
 693
 694        fd = open(cmd, O_RDONLY);
 695        if (fd < 0)
 696                return NULL;
 697        n = read(fd, buf, sizeof(buf)-1);
 698        close(fd);
 699        if (n < 4)      /* at least '#!/x' and not error */
 700                return NULL;
 701
 702        if (buf[0] != '#' || buf[1] != '!')
 703                return NULL;
 704        buf[n] = '\0';
 705        p = buf + strcspn(buf, "\r\n");
 706        if (!*p)
 707                return NULL;
 708
 709        *p = '\0';
 710        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 711                return NULL;
 712        /* strip options */
 713        if ((opt = strchr(p+1, ' ')))
 714                *opt = '\0';
 715        return p+1;
 716}
 717
 718/*
 719 * Splits the PATH into parts.
 720 */
 721static char **get_path_split(void)
 722{
 723        char *p, **path, *envpath = mingw_getenv("PATH");
 724        int i, n = 0;
 725
 726        if (!envpath || !*envpath)
 727                return NULL;
 728
 729        envpath = xstrdup(envpath);
 730        p = envpath;
 731        while (p) {
 732                char *dir = p;
 733                p = strchr(p, ';');
 734                if (p) *p++ = '\0';
 735                if (*dir) {     /* not earlier, catches series of ; */
 736                        ++n;
 737                }
 738        }
 739        if (!n)
 740                return NULL;
 741
 742        path = xmalloc((n+1)*sizeof(char *));
 743        p = envpath;
 744        i = 0;
 745        do {
 746                if (*p)
 747                        path[i++] = xstrdup(p);
 748                p = p+strlen(p)+1;
 749        } while (i < n);
 750        path[i] = NULL;
 751
 752        free(envpath);
 753
 754        return path;
 755}
 756
 757static void free_path_split(char **path)
 758{
 759        char **p = path;
 760
 761        if (!path)
 762                return;
 763
 764        while (*p)
 765                free(*p++);
 766        free(path);
 767}
 768
 769/*
 770 * exe_only means that we only want to detect .exe files, but not scripts
 771 * (which do not have an extension)
 772 */
 773static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 774{
 775        char path[MAX_PATH];
 776        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 777
 778        if (!isexe && access(path, F_OK) == 0)
 779                return xstrdup(path);
 780        path[strlen(path)-4] = '\0';
 781        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 782                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 783                        return xstrdup(path);
 784        return NULL;
 785}
 786
 787/*
 788 * Determines the absolute path of cmd using the split path in path.
 789 * If cmd contains a slash or backslash, no lookup is performed.
 790 */
 791static char *path_lookup(const char *cmd, char **path, int exe_only)
 792{
 793        char *prog = NULL;
 794        int len = strlen(cmd);
 795        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 796
 797        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 798                prog = xstrdup(cmd);
 799
 800        while (!prog && *path)
 801                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 802
 803        return prog;
 804}
 805
 806static int env_compare(const void *a, const void *b)
 807{
 808        char *const *ea = a;
 809        char *const *eb = b;
 810        return strcasecmp(*ea, *eb);
 811}
 812
 813struct pinfo_t {
 814        struct pinfo_t *next;
 815        pid_t pid;
 816        HANDLE proc;
 817} pinfo_t;
 818struct pinfo_t *pinfo = NULL;
 819CRITICAL_SECTION pinfo_cs;
 820
 821static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 822                              const char *dir,
 823                              int prepend_cmd, int fhin, int fhout, int fherr)
 824{
 825        STARTUPINFO si;
 826        PROCESS_INFORMATION pi;
 827        struct strbuf envblk, args;
 828        unsigned flags;
 829        BOOL ret;
 830
 831        /* Determine whether or not we are associated to a console */
 832        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 833                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 834                        FILE_ATTRIBUTE_NORMAL, NULL);
 835        if (cons == INVALID_HANDLE_VALUE) {
 836                /* There is no console associated with this process.
 837                 * Since the child is a console process, Windows
 838                 * would normally create a console window. But
 839                 * since we'll be redirecting std streams, we do
 840                 * not need the console.
 841                 * It is necessary to use DETACHED_PROCESS
 842                 * instead of CREATE_NO_WINDOW to make ssh
 843                 * recognize that it has no console.
 844                 */
 845                flags = DETACHED_PROCESS;
 846        } else {
 847                /* There is already a console. If we specified
 848                 * DETACHED_PROCESS here, too, Windows would
 849                 * disassociate the child from the console.
 850                 * The same is true for CREATE_NO_WINDOW.
 851                 * Go figure!
 852                 */
 853                flags = 0;
 854                CloseHandle(cons);
 855        }
 856        memset(&si, 0, sizeof(si));
 857        si.cb = sizeof(si);
 858        si.dwFlags = STARTF_USESTDHANDLES;
 859        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 860        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 861        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 862
 863        /* concatenate argv, quoting args as we go */
 864        strbuf_init(&args, 0);
 865        if (prepend_cmd) {
 866                char *quoted = (char *)quote_arg(cmd);
 867                strbuf_addstr(&args, quoted);
 868                if (quoted != cmd)
 869                        free(quoted);
 870        }
 871        for (; *argv; argv++) {
 872                char *quoted = (char *)quote_arg(*argv);
 873                if (*args.buf)
 874                        strbuf_addch(&args, ' ');
 875                strbuf_addstr(&args, quoted);
 876                if (quoted != *argv)
 877                        free(quoted);
 878        }
 879
 880        if (env) {
 881                int count = 0;
 882                char **e, **sorted_env;
 883
 884                for (e = env; *e; e++)
 885                        count++;
 886
 887                /* environment must be sorted */
 888                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 889                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 890                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 891
 892                strbuf_init(&envblk, 0);
 893                for (e = sorted_env; *e; e++) {
 894                        strbuf_addstr(&envblk, *e);
 895                        strbuf_addch(&envblk, '\0');
 896                }
 897                free(sorted_env);
 898        }
 899
 900        memset(&pi, 0, sizeof(pi));
 901        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 902                env ? envblk.buf : NULL, dir, &si, &pi);
 903
 904        if (env)
 905                strbuf_release(&envblk);
 906        strbuf_release(&args);
 907
 908        if (!ret) {
 909                errno = ENOENT;
 910                return -1;
 911        }
 912        CloseHandle(pi.hThread);
 913
 914        /*
 915         * The process ID is the human-readable identifier of the process
 916         * that we want to present in log and error messages. The handle
 917         * is not useful for this purpose. But we cannot close it, either,
 918         * because it is not possible to turn a process ID into a process
 919         * handle after the process terminated.
 920         * Keep the handle in a list for waitpid.
 921         */
 922        EnterCriticalSection(&pinfo_cs);
 923        {
 924                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 925                info->pid = pi.dwProcessId;
 926                info->proc = pi.hProcess;
 927                info->next = pinfo;
 928                pinfo = info;
 929        }
 930        LeaveCriticalSection(&pinfo_cs);
 931
 932        return (pid_t)pi.dwProcessId;
 933}
 934
 935static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 936                           int prepend_cmd)
 937{
 938        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 939}
 940
 941pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 942                     const char *dir,
 943                     int fhin, int fhout, int fherr)
 944{
 945        pid_t pid;
 946        char **path = get_path_split();
 947        char *prog = path_lookup(cmd, path, 0);
 948
 949        if (!prog) {
 950                errno = ENOENT;
 951                pid = -1;
 952        }
 953        else {
 954                const char *interpr = parse_interpreter(prog);
 955
 956                if (interpr) {
 957                        const char *argv0 = argv[0];
 958                        char *iprog = path_lookup(interpr, path, 1);
 959                        argv[0] = prog;
 960                        if (!iprog) {
 961                                errno = ENOENT;
 962                                pid = -1;
 963                        }
 964                        else {
 965                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 966                                                       fhin, fhout, fherr);
 967                                free(iprog);
 968                        }
 969                        argv[0] = argv0;
 970                }
 971                else
 972                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 973                                               fhin, fhout, fherr);
 974                free(prog);
 975        }
 976        free_path_split(path);
 977        return pid;
 978}
 979
 980static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 981{
 982        const char *interpr = parse_interpreter(cmd);
 983        char **path;
 984        char *prog;
 985        int pid = 0;
 986
 987        if (!interpr)
 988                return 0;
 989        path = get_path_split();
 990        prog = path_lookup(interpr, path, 1);
 991        if (prog) {
 992                int argc = 0;
 993                const char **argv2;
 994                while (argv[argc]) argc++;
 995                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 996                argv2[0] = (char *)cmd; /* full path to the script file */
 997                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 998                pid = mingw_spawnve(prog, argv2, env, 1);
 999                if (pid >= 0) {
1000                        int status;
1001                        if (waitpid(pid, &status, 0) < 0)
1002                                status = 255;
1003                        exit(status);
1004                }
1005                pid = 1;        /* indicate that we tried but failed */
1006                free(prog);
1007                free(argv2);
1008        }
1009        free_path_split(path);
1010        return pid;
1011}
1012
1013static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1014{
1015        /* check if git_command is a shell script */
1016        if (!try_shell_exec(cmd, argv, (char **)env)) {
1017                int pid, status;
1018
1019                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1020                if (pid < 0)
1021                        return;
1022                if (waitpid(pid, &status, 0) < 0)
1023                        status = 255;
1024                exit(status);
1025        }
1026}
1027
1028int mingw_execvp(const char *cmd, char *const *argv)
1029{
1030        char **path = get_path_split();
1031        char *prog = path_lookup(cmd, path, 0);
1032
1033        if (prog) {
1034                mingw_execve(prog, argv, environ);
1035                free(prog);
1036        } else
1037                errno = ENOENT;
1038
1039        free_path_split(path);
1040        return -1;
1041}
1042
1043int mingw_execv(const char *cmd, char *const *argv)
1044{
1045        mingw_execve(cmd, argv, environ);
1046        return -1;
1047}
1048
1049int mingw_kill(pid_t pid, int sig)
1050{
1051        if (pid > 0 && sig == SIGTERM) {
1052                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1053
1054                if (TerminateProcess(h, -1)) {
1055                        CloseHandle(h);
1056                        return 0;
1057                }
1058
1059                errno = err_win_to_posix(GetLastError());
1060                CloseHandle(h);
1061                return -1;
1062        }
1063
1064        errno = EINVAL;
1065        return -1;
1066}
1067
1068static char **copy_environ(void)
1069{
1070        char **env;
1071        int i = 0;
1072        while (environ[i])
1073                i++;
1074        env = xmalloc((i+1)*sizeof(*env));
1075        for (i = 0; environ[i]; i++)
1076                env[i] = xstrdup(environ[i]);
1077        env[i] = NULL;
1078        return env;
1079}
1080
1081void free_environ(char **env)
1082{
1083        int i;
1084        for (i = 0; env[i]; i++)
1085                free(env[i]);
1086        free(env);
1087}
1088
1089static int lookup_env(char **env, const char *name, size_t nmln)
1090{
1091        int i;
1092
1093        for (i = 0; env[i]; i++) {
1094                if (0 == strncmp(env[i], name, nmln)
1095                    && '=' == env[i][nmln])
1096                        /* matches */
1097                        return i;
1098        }
1099        return -1;
1100}
1101
1102/*
1103 * If name contains '=', then sets the variable, otherwise it unsets it
1104 */
1105static char **env_setenv(char **env, const char *name)
1106{
1107        char *eq = strchrnul(name, '=');
1108        int i = lookup_env(env, name, eq-name);
1109
1110        if (i < 0) {
1111                if (*eq) {
1112                        for (i = 0; env[i]; i++)
1113                                ;
1114                        env = xrealloc(env, (i+2)*sizeof(*env));
1115                        env[i] = xstrdup(name);
1116                        env[i+1] = NULL;
1117                }
1118        }
1119        else {
1120                free(env[i]);
1121                if (*eq)
1122                        env[i] = xstrdup(name);
1123                else
1124                        for (; env[i]; i++)
1125                                env[i] = env[i+1];
1126        }
1127        return env;
1128}
1129
1130/*
1131 * Copies global environ and adjusts variables as specified by vars.
1132 */
1133char **make_augmented_environ(const char *const *vars)
1134{
1135        char **env = copy_environ();
1136
1137        while (*vars)
1138                env = env_setenv(env, *vars++);
1139        return env;
1140}
1141
1142#undef getenv
1143
1144/*
1145 * The system's getenv looks up the name in a case-insensitive manner.
1146 * This version tries a case-sensitive lookup and falls back to
1147 * case-insensitive if nothing was found.  This is necessary because,
1148 * as a prominent example, CMD sets 'Path', but not 'PATH'.
1149 * Warning: not thread-safe.
1150 */
1151static char *getenv_cs(const char *name)
1152{
1153        size_t len = strlen(name);
1154        int i = lookup_env(environ, name, len);
1155        if (i >= 0)
1156                return environ[i] + len + 1;    /* skip past name and '=' */
1157        return getenv(name);
1158}
1159
1160char *mingw_getenv(const char *name)
1161{
1162        char *result = getenv_cs(name);
1163        if (!result && !strcmp(name, "TMPDIR")) {
1164                /* on Windows it is TMP and TEMP */
1165                result = getenv_cs("TMP");
1166                if (!result)
1167                        result = getenv_cs("TEMP");
1168        }
1169        return result;
1170}
1171
1172/*
1173 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1174 * that service contains a numerical port, or that it is null. It
1175 * does a simple search using gethostbyname, and returns one IPv4 host
1176 * if one was found.
1177 */
1178static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1179                                   const struct addrinfo *hints,
1180                                   struct addrinfo **res)
1181{
1182        struct hostent *h = NULL;
1183        struct addrinfo *ai;
1184        struct sockaddr_in *sin;
1185
1186        if (node) {
1187                h = gethostbyname(node);
1188                if (!h)
1189                        return WSAGetLastError();
1190        }
1191
1192        ai = xmalloc(sizeof(struct addrinfo));
1193        *res = ai;
1194        ai->ai_flags = 0;
1195        ai->ai_family = AF_INET;
1196        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1197        switch (ai->ai_socktype) {
1198        case SOCK_STREAM:
1199                ai->ai_protocol = IPPROTO_TCP;
1200                break;
1201        case SOCK_DGRAM:
1202                ai->ai_protocol = IPPROTO_UDP;
1203                break;
1204        default:
1205                ai->ai_protocol = 0;
1206                break;
1207        }
1208        ai->ai_addrlen = sizeof(struct sockaddr_in);
1209        if (hints && (hints->ai_flags & AI_CANONNAME))
1210                ai->ai_canonname = h ? xstrdup(h->h_name) : NULL;
1211        else
1212                ai->ai_canonname = NULL;
1213
1214        sin = xmalloc(ai->ai_addrlen);
1215        memset(sin, 0, ai->ai_addrlen);
1216        sin->sin_family = AF_INET;
1217        /* Note: getaddrinfo is supposed to allow service to be a string,
1218         * which should be looked up using getservbyname. This is
1219         * currently not implemented */
1220        if (service)
1221                sin->sin_port = htons(atoi(service));
1222        if (h)
1223                sin->sin_addr = *(struct in_addr *)h->h_addr;
1224        else if (hints && (hints->ai_flags & AI_PASSIVE))
1225                sin->sin_addr.s_addr = INADDR_ANY;
1226        else
1227                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1228        ai->ai_addr = (struct sockaddr *)sin;
1229        ai->ai_next = 0;
1230        return 0;
1231}
1232
1233static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1234{
1235        free(res->ai_canonname);
1236        free(res->ai_addr);
1237        free(res);
1238}
1239
1240static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1241                                   char *host, DWORD hostlen,
1242                                   char *serv, DWORD servlen, int flags)
1243{
1244        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1245        if (sa->sa_family != AF_INET)
1246                return EAI_FAMILY;
1247        if (!host && !serv)
1248                return EAI_NONAME;
1249
1250        if (host && hostlen > 0) {
1251                struct hostent *ent = NULL;
1252                if (!(flags & NI_NUMERICHOST))
1253                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1254                                            sizeof(sin->sin_addr), AF_INET);
1255
1256                if (ent)
1257                        snprintf(host, hostlen, "%s", ent->h_name);
1258                else if (flags & NI_NAMEREQD)
1259                        return EAI_NONAME;
1260                else
1261                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1262        }
1263
1264        if (serv && servlen > 0) {
1265                struct servent *ent = NULL;
1266                if (!(flags & NI_NUMERICSERV))
1267                        ent = getservbyport(sin->sin_port,
1268                                            flags & NI_DGRAM ? "udp" : "tcp");
1269
1270                if (ent)
1271                        snprintf(serv, servlen, "%s", ent->s_name);
1272                else
1273                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1274        }
1275
1276        return 0;
1277}
1278
1279static HMODULE ipv6_dll = NULL;
1280static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1281static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1282                                      const struct addrinfo *hints,
1283                                      struct addrinfo **res);
1284static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1285                                      char *host, DWORD hostlen,
1286                                      char *serv, DWORD servlen, int flags);
1287/*
1288 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1289 * don't need to try to load that one dynamically.
1290 */
1291
1292static void socket_cleanup(void)
1293{
1294        WSACleanup();
1295        if (ipv6_dll)
1296                FreeLibrary(ipv6_dll);
1297        ipv6_dll = NULL;
1298        ipv6_freeaddrinfo = freeaddrinfo_stub;
1299        ipv6_getaddrinfo = getaddrinfo_stub;
1300        ipv6_getnameinfo = getnameinfo_stub;
1301}
1302
1303static void ensure_socket_initialization(void)
1304{
1305        WSADATA wsa;
1306        static int initialized = 0;
1307        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1308        const char **name;
1309
1310        if (initialized)
1311                return;
1312
1313        if (WSAStartup(MAKEWORD(2,2), &wsa))
1314                die("unable to initialize winsock subsystem, error %d",
1315                        WSAGetLastError());
1316
1317        for (name = libraries; *name; name++) {
1318                ipv6_dll = LoadLibrary(*name);
1319                if (!ipv6_dll)
1320                        continue;
1321
1322                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1323                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1324                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1325                                                   const struct addrinfo *,
1326                                                   struct addrinfo **))
1327                        GetProcAddress(ipv6_dll, "getaddrinfo");
1328                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1329                                                   socklen_t, char *, DWORD,
1330                                                   char *, DWORD, int))
1331                        GetProcAddress(ipv6_dll, "getnameinfo");
1332                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1333                        FreeLibrary(ipv6_dll);
1334                        ipv6_dll = NULL;
1335                } else
1336                        break;
1337        }
1338        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1339                ipv6_freeaddrinfo = freeaddrinfo_stub;
1340                ipv6_getaddrinfo = getaddrinfo_stub;
1341                ipv6_getnameinfo = getnameinfo_stub;
1342        }
1343
1344        atexit(socket_cleanup);
1345        initialized = 1;
1346}
1347
1348#undef gethostname
1349int mingw_gethostname(char *name, int namelen)
1350{
1351    ensure_socket_initialization();
1352    return gethostname(name, namelen);
1353}
1354
1355#undef gethostbyname
1356struct hostent *mingw_gethostbyname(const char *host)
1357{
1358        ensure_socket_initialization();
1359        return gethostbyname(host);
1360}
1361
1362void mingw_freeaddrinfo(struct addrinfo *res)
1363{
1364        ipv6_freeaddrinfo(res);
1365}
1366
1367int mingw_getaddrinfo(const char *node, const char *service,
1368                      const struct addrinfo *hints, struct addrinfo **res)
1369{
1370        ensure_socket_initialization();
1371        return ipv6_getaddrinfo(node, service, hints, res);
1372}
1373
1374int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1375                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1376                      int flags)
1377{
1378        ensure_socket_initialization();
1379        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1380}
1381
1382int mingw_socket(int domain, int type, int protocol)
1383{
1384        int sockfd;
1385        SOCKET s;
1386
1387        ensure_socket_initialization();
1388        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1389        if (s == INVALID_SOCKET) {
1390                /*
1391                 * WSAGetLastError() values are regular BSD error codes
1392                 * biased by WSABASEERR.
1393                 * However, strerror() does not know about networking
1394                 * specific errors, which are values beginning at 38 or so.
1395                 * Therefore, we choose to leave the biased error code
1396                 * in errno so that _if_ someone looks up the code somewhere,
1397                 * then it is at least the number that are usually listed.
1398                 */
1399                errno = WSAGetLastError();
1400                return -1;
1401        }
1402        /* convert into a file descriptor */
1403        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1404                closesocket(s);
1405                return error("unable to make a socket file descriptor: %s",
1406                        strerror(errno));
1407        }
1408        return sockfd;
1409}
1410
1411#undef connect
1412int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1413{
1414        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1415        return connect(s, sa, sz);
1416}
1417
1418#undef bind
1419int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1420{
1421        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1422        return bind(s, sa, sz);
1423}
1424
1425#undef setsockopt
1426int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1427{
1428        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1429        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1430}
1431
1432#undef shutdown
1433int mingw_shutdown(int sockfd, int how)
1434{
1435        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1436        return shutdown(s, how);
1437}
1438
1439#undef listen
1440int mingw_listen(int sockfd, int backlog)
1441{
1442        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1443        return listen(s, backlog);
1444}
1445
1446#undef accept
1447int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1448{
1449        int sockfd2;
1450
1451        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1452        SOCKET s2 = accept(s1, sa, sz);
1453
1454        /* convert into a file descriptor */
1455        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1456                int err = errno;
1457                closesocket(s2);
1458                return error("unable to make a socket file descriptor: %s",
1459                        strerror(err));
1460        }
1461        return sockfd2;
1462}
1463
1464#undef rename
1465int mingw_rename(const char *pold, const char *pnew)
1466{
1467        DWORD attrs, gle;
1468        int tries = 0;
1469
1470        /*
1471         * Try native rename() first to get errno right.
1472         * It is based on MoveFile(), which cannot overwrite existing files.
1473         */
1474        if (!rename(pold, pnew))
1475                return 0;
1476        if (errno != EEXIST)
1477                return -1;
1478repeat:
1479        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1480                return 0;
1481        /* TODO: translate more errors */
1482        gle = GetLastError();
1483        if (gle == ERROR_ACCESS_DENIED &&
1484            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1485                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1486                        errno = EISDIR;
1487                        return -1;
1488                }
1489                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1490                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1491                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1492                                return 0;
1493                        gle = GetLastError();
1494                        /* revert file attributes on failure */
1495                        SetFileAttributes(pnew, attrs);
1496                }
1497        }
1498        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1499                /*
1500                 * We assume that some other process had the source or
1501                 * destination file open at the wrong moment and retry.
1502                 * In order to give the other process a higher chance to
1503                 * complete its operation, we give up our time slice now.
1504                 * If we have to retry again, we do sleep a bit.
1505                 */
1506                Sleep(delay[tries]);
1507                tries++;
1508                goto repeat;
1509        }
1510        if (gle == ERROR_ACCESS_DENIED &&
1511               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1512                       "Should I try again?", pold, pnew))
1513                goto repeat;
1514
1515        errno = EACCES;
1516        return -1;
1517}
1518
1519/*
1520 * Note that this doesn't return the actual pagesize, but
1521 * the allocation granularity. If future Windows specific git code
1522 * needs the real getpagesize function, we need to find another solution.
1523 */
1524int mingw_getpagesize(void)
1525{
1526        SYSTEM_INFO si;
1527        GetSystemInfo(&si);
1528        return si.dwAllocationGranularity;
1529}
1530
1531struct passwd *getpwuid(int uid)
1532{
1533        static char user_name[100];
1534        static struct passwd p;
1535
1536        DWORD len = sizeof(user_name);
1537        if (!GetUserName(user_name, &len))
1538                return NULL;
1539        p.pw_name = user_name;
1540        p.pw_gecos = "unknown";
1541        p.pw_dir = NULL;
1542        return &p;
1543}
1544
1545static HANDLE timer_event;
1546static HANDLE timer_thread;
1547static int timer_interval;
1548static int one_shot;
1549static sig_handler_t timer_fn = SIG_DFL;
1550
1551/* The timer works like this:
1552 * The thread, ticktack(), is a trivial routine that most of the time
1553 * only waits to receive the signal to terminate. The main thread tells
1554 * the thread to terminate by setting the timer_event to the signalled
1555 * state.
1556 * But ticktack() interrupts the wait state after the timer's interval
1557 * length to call the signal handler.
1558 */
1559
1560static unsigned __stdcall ticktack(void *dummy)
1561{
1562        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1563                if (timer_fn == SIG_DFL)
1564                        die("Alarm");
1565                if (timer_fn != SIG_IGN)
1566                        timer_fn(SIGALRM);
1567                if (one_shot)
1568                        break;
1569        }
1570        return 0;
1571}
1572
1573static int start_timer_thread(void)
1574{
1575        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1576        if (timer_event) {
1577                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1578                if (!timer_thread )
1579                        return errno = ENOMEM,
1580                                error("cannot start timer thread");
1581        } else
1582                return errno = ENOMEM,
1583                        error("cannot allocate resources for timer");
1584        return 0;
1585}
1586
1587static void stop_timer_thread(void)
1588{
1589        if (timer_event)
1590                SetEvent(timer_event);  /* tell thread to terminate */
1591        if (timer_thread) {
1592                int rc = WaitForSingleObject(timer_thread, 1000);
1593                if (rc == WAIT_TIMEOUT)
1594                        error("timer thread did not terminate timely");
1595                else if (rc != WAIT_OBJECT_0)
1596                        error("waiting for timer thread failed: %lu",
1597                              GetLastError());
1598                CloseHandle(timer_thread);
1599        }
1600        if (timer_event)
1601                CloseHandle(timer_event);
1602        timer_event = NULL;
1603        timer_thread = NULL;
1604}
1605
1606static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1607{
1608        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1609}
1610
1611int setitimer(int type, struct itimerval *in, struct itimerval *out)
1612{
1613        static const struct timeval zero;
1614        static int atexit_done;
1615
1616        if (out != NULL)
1617                return errno = EINVAL,
1618                        error("setitimer param 3 != NULL not implemented");
1619        if (!is_timeval_eq(&in->it_interval, &zero) &&
1620            !is_timeval_eq(&in->it_interval, &in->it_value))
1621                return errno = EINVAL,
1622                        error("setitimer: it_interval must be zero or eq it_value");
1623
1624        if (timer_thread)
1625                stop_timer_thread();
1626
1627        if (is_timeval_eq(&in->it_value, &zero) &&
1628            is_timeval_eq(&in->it_interval, &zero))
1629                return 0;
1630
1631        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1632        one_shot = is_timeval_eq(&in->it_interval, &zero);
1633        if (!atexit_done) {
1634                atexit(stop_timer_thread);
1635                atexit_done = 1;
1636        }
1637        return start_timer_thread();
1638}
1639
1640int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1641{
1642        if (sig != SIGALRM)
1643                return errno = EINVAL,
1644                        error("sigaction only implemented for SIGALRM");
1645        if (out != NULL)
1646                return errno = EINVAL,
1647                        error("sigaction: param 3 != NULL not implemented");
1648
1649        timer_fn = in->sa_handler;
1650        return 0;
1651}
1652
1653#undef signal
1654sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1655{
1656        sig_handler_t old = timer_fn;
1657        if (sig != SIGALRM)
1658                return signal(sig, handler);
1659        timer_fn = handler;
1660        return old;
1661}
1662
1663static const char *make_backslash_path(const char *path)
1664{
1665        static char buf[PATH_MAX + 1];
1666        char *c;
1667
1668        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1669                die("Too long path: %.*s", 60, path);
1670
1671        for (c = buf; *c; c++) {
1672                if (*c == '/')
1673                        *c = '\\';
1674        }
1675        return buf;
1676}
1677
1678void mingw_open_html(const char *unixpath)
1679{
1680        const char *htmlpath = make_backslash_path(unixpath);
1681        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1682                        const char *, const char *, const char *, INT);
1683        T ShellExecute;
1684        HMODULE shell32;
1685        int r;
1686
1687        shell32 = LoadLibrary("shell32.dll");
1688        if (!shell32)
1689                die("cannot load shell32.dll");
1690        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1691        if (!ShellExecute)
1692                die("cannot run browser");
1693
1694        printf("Launching default browser to display HTML ...\n");
1695        r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1696        FreeLibrary(shell32);
1697        /* see the MSDN documentation referring to the result codes here */
1698        if (r <= 32) {
1699                die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1700        }
1701}
1702
1703int link(const char *oldpath, const char *newpath)
1704{
1705        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1706        static T create_hard_link = NULL;
1707        if (!create_hard_link) {
1708                create_hard_link = (T) GetProcAddress(
1709                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1710                if (!create_hard_link)
1711                        create_hard_link = (T)-1;
1712        }
1713        if (create_hard_link == (T)-1) {
1714                errno = ENOSYS;
1715                return -1;
1716        }
1717        if (!create_hard_link(newpath, oldpath, NULL)) {
1718                errno = err_win_to_posix(GetLastError());
1719                return -1;
1720        }
1721        return 0;
1722}
1723
1724char *getpass(const char *prompt)
1725{
1726        struct strbuf buf = STRBUF_INIT;
1727
1728        fputs(prompt, stderr);
1729        for (;;) {
1730                char c = _getch();
1731                if (c == '\r' || c == '\n')
1732                        break;
1733                strbuf_addch(&buf, c);
1734        }
1735        fputs("\n", stderr);
1736        return strbuf_detach(&buf, NULL);
1737}
1738
1739pid_t waitpid(pid_t pid, int *status, int options)
1740{
1741        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1742            FALSE, pid);
1743        if (!h) {
1744                errno = ECHILD;
1745                return -1;
1746        }
1747
1748        if (pid > 0 && options & WNOHANG) {
1749                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1750                        CloseHandle(h);
1751                        return 0;
1752                }
1753                options &= ~WNOHANG;
1754        }
1755
1756        if (options == 0) {
1757                struct pinfo_t **ppinfo;
1758                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1759                        CloseHandle(h);
1760                        return 0;
1761                }
1762
1763                if (status)
1764                        GetExitCodeProcess(h, (LPDWORD)status);
1765
1766                EnterCriticalSection(&pinfo_cs);
1767
1768                ppinfo = &pinfo;
1769                while (*ppinfo) {
1770                        struct pinfo_t *info = *ppinfo;
1771                        if (info->pid == pid) {
1772                                CloseHandle(info->proc);
1773                                *ppinfo = info->next;
1774                                free(info);
1775                                break;
1776                        }
1777                        ppinfo = &info->next;
1778                }
1779
1780                LeaveCriticalSection(&pinfo_cs);
1781
1782                CloseHandle(h);
1783                return pid;
1784        }
1785        CloseHandle(h);
1786
1787        errno = EINVAL;
1788        return -1;
1789}