Andrew's git / gitweb.git / compat/mingw.c
?
compat / mingw.con commit Merge branch 'wp/merge-tree-fix' (ea56a7e)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5
   6int err_win_to_posix(DWORD winerr)
   7{
   8        int error = ENOSYS;
   9        switch(winerr) {
  10        case ERROR_ACCESS_DENIED: error = EACCES; break;
  11        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  12        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  13        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  14        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  15        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  16        case ERROR_BAD_COMMAND: error = EIO; break;
  17        case ERROR_BAD_DEVICE: error = ENODEV; break;
  18        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  19        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  20        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  21        case ERROR_BAD_LENGTH: error = EINVAL; break;
  22        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  23        case ERROR_BAD_PIPE: error = EPIPE; break;
  24        case ERROR_BAD_UNIT: error = ENODEV; break;
  25        case ERROR_BAD_USERNAME: error = EINVAL; break;
  26        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  27        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  28        case ERROR_BUSY: error = EBUSY; break;
  29        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  30        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  31        case ERROR_CANNOT_MAKE: error = EACCES; break;
  32        case ERROR_CANTOPEN: error = EIO; break;
  33        case ERROR_CANTREAD: error = EIO; break;
  34        case ERROR_CANTWRITE: error = EIO; break;
  35        case ERROR_CRC: error = EIO; break;
  36        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  37        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  38        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  39        case ERROR_DIRECTORY: error = EINVAL; break;
  40        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  41        case ERROR_DISK_CHANGE: error = EIO; break;
  42        case ERROR_DISK_FULL: error = ENOSPC; break;
  43        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  44        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  45        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  46        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  47        case ERROR_FILE_EXISTS: error = EEXIST; break;
  48        case ERROR_FILE_INVALID: error = ENODEV; break;
  49        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  50        case ERROR_GEN_FAILURE: error = EIO; break;
  51        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  52        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  53        case ERROR_INVALID_ACCESS: error = EACCES; break;
  54        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  55        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  56        case ERROR_INVALID_DATA: error = EINVAL; break;
  57        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  58        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  59        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  60        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  61        case ERROR_INVALID_HANDLE: error = EBADF; break;
  62        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  63        case ERROR_INVALID_NAME: error = EINVAL; break;
  64        case ERROR_INVALID_OWNER: error = EINVAL; break;
  65        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  66        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  67        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  68        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  69        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  70        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  71        case ERROR_IO_DEVICE: error = EIO; break;
  72        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  73        case ERROR_LOCKED: error = EBUSY; break;
  74        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  75        case ERROR_LOGON_FAILURE: error = EACCES; break;
  76        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  77        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  78        case ERROR_MORE_DATA: error = EPIPE; break;
  79        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  80        case ERROR_NOACCESS: error = EFAULT; break;
  81        case ERROR_NONE_MAPPED: error = EINVAL; break;
  82        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  83        case ERROR_NOT_READY: error = EAGAIN; break;
  84        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  85        case ERROR_NO_DATA: error = EPIPE; break;
  86        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  87        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  88        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  89        case ERROR_OPEN_FAILED: error = EIO; break;
  90        case ERROR_OPEN_FILES: error = EBUSY; break;
  91        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  92        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  93        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  94        case ERROR_PATH_BUSY: error = EBUSY; break;
  95        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  96        case ERROR_PIPE_BUSY: error = EBUSY; break;
  97        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
  98        case ERROR_PIPE_LISTENING: error = EPIPE; break;
  99        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 100        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 101        case ERROR_READ_FAULT: error = EIO; break;
 102        case ERROR_SEEK: error = EIO; break;
 103        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 104        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 105        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 106        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 107        case ERROR_SWAPERROR: error = ENOENT; break;
 108        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 109        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 110        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 111        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 112        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 113        case ERROR_WRITE_FAULT: error = EIO; break;
 114        case ERROR_WRITE_PROTECT: error = EROFS; break;
 115        }
 116        return error;
 117}
 118
 119#undef open
 120int mingw_open (const char *filename, int oflags, ...)
 121{
 122        va_list args;
 123        unsigned mode;
 124        int fd;
 125
 126        va_start(args, oflags);
 127        mode = va_arg(args, int);
 128        va_end(args);
 129
 130        if (!strcmp(filename, "/dev/null"))
 131                filename = "nul";
 132
 133        fd = open(filename, oflags, mode);
 134
 135        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 136                DWORD attrs = GetFileAttributes(filename);
 137                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 138                        errno = EISDIR;
 139        }
 140        return fd;
 141}
 142
 143#undef write
 144ssize_t mingw_write(int fd, const void *buf, size_t count)
 145{
 146        /*
 147         * While write() calls to a file on a local disk are translated
 148         * into WriteFile() calls with a maximum size of 64KB on Windows
 149         * XP and 256KB on Vista, no such cap is placed on writes to
 150         * files over the network on Windows XP.  Unfortunately, there
 151         * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 152         * bigger writes fail on Windows XP.
 153         * So we cap to a nice 31MB here to avoid write failures over
 154         * the net without changing the number of WriteFile() calls in
 155         * the local case.
 156         */
 157        return write(fd, buf, min(count, 31 * 1024 * 1024));
 158}
 159
 160#undef fopen
 161FILE *mingw_fopen (const char *filename, const char *otype)
 162{
 163        if (!strcmp(filename, "/dev/null"))
 164                filename = "nul";
 165        return fopen(filename, otype);
 166}
 167
 168#undef freopen
 169FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 170{
 171        if (filename && !strcmp(filename, "/dev/null"))
 172                filename = "nul";
 173        return freopen(filename, otype, stream);
 174}
 175
 176/*
 177 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 178 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 179 */
 180static inline long long filetime_to_hnsec(const FILETIME *ft)
 181{
 182        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 183        /* Windows to Unix Epoch conversion */
 184        return winTime - 116444736000000000LL;
 185}
 186
 187static inline time_t filetime_to_time_t(const FILETIME *ft)
 188{
 189        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 190}
 191
 192/* We keep the do_lstat code in a separate function to avoid recursion.
 193 * When a path ends with a slash, the stat will fail with ENOENT. In
 194 * this case, we strip the trailing slashes and stat again.
 195 */
 196static int do_lstat(const char *file_name, struct stat *buf)
 197{
 198        WIN32_FILE_ATTRIBUTE_DATA fdata;
 199
 200        if (!(errno = get_file_attr(file_name, &fdata))) {
 201                buf->st_ino = 0;
 202                buf->st_gid = 0;
 203                buf->st_uid = 0;
 204                buf->st_nlink = 1;
 205                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 206                buf->st_size = fdata.nFileSizeLow |
 207                        (((off_t)fdata.nFileSizeHigh)<<32);
 208                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 209                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 210                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 211                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 212                return 0;
 213        }
 214        return -1;
 215}
 216
 217/* We provide our own lstat/fstat functions, since the provided
 218 * lstat/fstat functions are so slow. These stat functions are
 219 * tailored for Git's usage (read: fast), and are not meant to be
 220 * complete. Note that Git stat()s are redirected to mingw_lstat()
 221 * too, since Windows doesn't really handle symlinks that well.
 222 */
 223int mingw_lstat(const char *file_name, struct stat *buf)
 224{
 225        int namelen;
 226        static char alt_name[PATH_MAX];
 227
 228        if (!do_lstat(file_name, buf))
 229                return 0;
 230
 231        /* if file_name ended in a '/', Windows returned ENOENT;
 232         * try again without trailing slashes
 233         */
 234        if (errno != ENOENT)
 235                return -1;
 236
 237        namelen = strlen(file_name);
 238        if (namelen && file_name[namelen-1] != '/')
 239                return -1;
 240        while (namelen && file_name[namelen-1] == '/')
 241                --namelen;
 242        if (!namelen || namelen >= PATH_MAX)
 243                return -1;
 244
 245        memcpy(alt_name, file_name, namelen);
 246        alt_name[namelen] = 0;
 247        return do_lstat(alt_name, buf);
 248}
 249
 250#undef fstat
 251int mingw_fstat(int fd, struct stat *buf)
 252{
 253        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 254        BY_HANDLE_FILE_INFORMATION fdata;
 255
 256        if (fh == INVALID_HANDLE_VALUE) {
 257                errno = EBADF;
 258                return -1;
 259        }
 260        /* direct non-file handles to MS's fstat() */
 261        if (GetFileType(fh) != FILE_TYPE_DISK)
 262                return _fstati64(fd, buf);
 263
 264        if (GetFileInformationByHandle(fh, &fdata)) {
 265                buf->st_ino = 0;
 266                buf->st_gid = 0;
 267                buf->st_uid = 0;
 268                buf->st_nlink = 1;
 269                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 270                buf->st_size = fdata.nFileSizeLow |
 271                        (((off_t)fdata.nFileSizeHigh)<<32);
 272                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 273                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 274                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 275                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 276                return 0;
 277        }
 278        errno = EBADF;
 279        return -1;
 280}
 281
 282static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 283{
 284        long long winTime = t * 10000000LL + 116444736000000000LL;
 285        ft->dwLowDateTime = winTime;
 286        ft->dwHighDateTime = winTime >> 32;
 287}
 288
 289int mingw_utime (const char *file_name, const struct utimbuf *times)
 290{
 291        FILETIME mft, aft;
 292        int fh, rc;
 293
 294        /* must have write permission */
 295        DWORD attrs = GetFileAttributes(file_name);
 296        if (attrs != INVALID_FILE_ATTRIBUTES &&
 297            (attrs & FILE_ATTRIBUTE_READONLY)) {
 298                /* ignore errors here; open() will report them */
 299                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 300        }
 301
 302        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 303                rc = -1;
 304                goto revert_attrs;
 305        }
 306
 307        time_t_to_filetime(times->modtime, &mft);
 308        time_t_to_filetime(times->actime, &aft);
 309        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 310                errno = EINVAL;
 311                rc = -1;
 312        } else
 313                rc = 0;
 314        close(fh);
 315
 316revert_attrs:
 317        if (attrs != INVALID_FILE_ATTRIBUTES &&
 318            (attrs & FILE_ATTRIBUTE_READONLY)) {
 319                /* ignore errors again */
 320                SetFileAttributes(file_name, attrs);
 321        }
 322        return rc;
 323}
 324
 325unsigned int sleep (unsigned int seconds)
 326{
 327        Sleep(seconds*1000);
 328        return 0;
 329}
 330
 331int mkstemp(char *template)
 332{
 333        char *filename = mktemp(template);
 334        if (filename == NULL)
 335                return -1;
 336        return open(filename, O_RDWR | O_CREAT, 0600);
 337}
 338
 339int gettimeofday(struct timeval *tv, void *tz)
 340{
 341        FILETIME ft;
 342        long long hnsec;
 343
 344        GetSystemTimeAsFileTime(&ft);
 345        hnsec = filetime_to_hnsec(&ft);
 346        tv->tv_sec = hnsec / 10000000;
 347        tv->tv_usec = (hnsec % 10000000) / 10;
 348        return 0;
 349}
 350
 351int pipe(int filedes[2])
 352{
 353        HANDLE h[2];
 354
 355        /* this creates non-inheritable handles */
 356        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 357                errno = err_win_to_posix(GetLastError());
 358                return -1;
 359        }
 360        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 361        if (filedes[0] < 0) {
 362                CloseHandle(h[0]);
 363                CloseHandle(h[1]);
 364                return -1;
 365        }
 366        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 367        if (filedes[0] < 0) {
 368                close(filedes[0]);
 369                CloseHandle(h[1]);
 370                return -1;
 371        }
 372        return 0;
 373}
 374
 375int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 376{
 377        int i, pending;
 378
 379        if (timeout >= 0) {
 380                if (nfds == 0) {
 381                        Sleep(timeout);
 382                        return 0;
 383                }
 384                return errno = EINVAL, error("poll timeout not supported");
 385        }
 386
 387        /* When there is only one fd to wait for, then we pretend that
 388         * input is available and let the actual wait happen when the
 389         * caller invokes read().
 390         */
 391        if (nfds == 1) {
 392                if (!(ufds[0].events & POLLIN))
 393                        return errno = EINVAL, error("POLLIN not set");
 394                ufds[0].revents = POLLIN;
 395                return 0;
 396        }
 397
 398repeat:
 399        pending = 0;
 400        for (i = 0; i < nfds; i++) {
 401                DWORD avail = 0;
 402                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 403                if (h == INVALID_HANDLE_VALUE)
 404                        return -1;      /* errno was set */
 405
 406                if (!(ufds[i].events & POLLIN))
 407                        return errno = EINVAL, error("POLLIN not set");
 408
 409                /* this emulation works only for pipes */
 410                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 411                        int err = GetLastError();
 412                        if (err == ERROR_BROKEN_PIPE) {
 413                                ufds[i].revents = POLLHUP;
 414                                pending++;
 415                        } else {
 416                                errno = EINVAL;
 417                                return error("PeekNamedPipe failed,"
 418                                        " GetLastError: %u", err);
 419                        }
 420                } else if (avail) {
 421                        ufds[i].revents = POLLIN;
 422                        pending++;
 423                } else
 424                        ufds[i].revents = 0;
 425        }
 426        if (!pending) {
 427                /* The only times that we spin here is when the process
 428                 * that is connected through the pipes is waiting for
 429                 * its own input data to become available. But since
 430                 * the process (pack-objects) is itself CPU intensive,
 431                 * it will happily pick up the time slice that we are
 432                 * relinquishing here.
 433                 */
 434                Sleep(0);
 435                goto repeat;
 436        }
 437        return 0;
 438}
 439
 440struct tm *gmtime_r(const time_t *timep, struct tm *result)
 441{
 442        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 443        memcpy(result, gmtime(timep), sizeof(struct tm));
 444        return result;
 445}
 446
 447struct tm *localtime_r(const time_t *timep, struct tm *result)
 448{
 449        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 450        memcpy(result, localtime(timep), sizeof(struct tm));
 451        return result;
 452}
 453
 454#undef getcwd
 455char *mingw_getcwd(char *pointer, int len)
 456{
 457        int i;
 458        char *ret = getcwd(pointer, len);
 459        if (!ret)
 460                return ret;
 461        for (i = 0; pointer[i]; i++)
 462                if (pointer[i] == '\\')
 463                        pointer[i] = '/';
 464        return ret;
 465}
 466
 467#undef getenv
 468char *mingw_getenv(const char *name)
 469{
 470        char *result = getenv(name);
 471        if (!result && !strcmp(name, "TMPDIR")) {
 472                /* on Windows it is TMP and TEMP */
 473                result = getenv("TMP");
 474                if (!result)
 475                        result = getenv("TEMP");
 476        }
 477        return result;
 478}
 479
 480/*
 481 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 482 * (Parsing C++ Command-Line Arguments)
 483 */
 484static const char *quote_arg(const char *arg)
 485{
 486        /* count chars to quote */
 487        int len = 0, n = 0;
 488        int force_quotes = 0;
 489        char *q, *d;
 490        const char *p = arg;
 491        if (!*p) force_quotes = 1;
 492        while (*p) {
 493                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 494                        force_quotes = 1;
 495                else if (*p == '"')
 496                        n++;
 497                else if (*p == '\\') {
 498                        int count = 0;
 499                        while (*p == '\\') {
 500                                count++;
 501                                p++;
 502                                len++;
 503                        }
 504                        if (*p == '"')
 505                                n += count*2 + 1;
 506                        continue;
 507                }
 508                len++;
 509                p++;
 510        }
 511        if (!force_quotes && n == 0)
 512                return arg;
 513
 514        /* insert \ where necessary */
 515        d = q = xmalloc(len+n+3);
 516        *d++ = '"';
 517        while (*arg) {
 518                if (*arg == '"')
 519                        *d++ = '\\';
 520                else if (*arg == '\\') {
 521                        int count = 0;
 522                        while (*arg == '\\') {
 523                                count++;
 524                                *d++ = *arg++;
 525                        }
 526                        if (*arg == '"') {
 527                                while (count-- > 0)
 528                                        *d++ = '\\';
 529                                *d++ = '\\';
 530                        }
 531                }
 532                *d++ = *arg++;
 533        }
 534        *d++ = '"';
 535        *d++ = 0;
 536        return q;
 537}
 538
 539static const char *parse_interpreter(const char *cmd)
 540{
 541        static char buf[100];
 542        char *p, *opt;
 543        int n, fd;
 544
 545        /* don't even try a .exe */
 546        n = strlen(cmd);
 547        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 548                return NULL;
 549
 550        fd = open(cmd, O_RDONLY);
 551        if (fd < 0)
 552                return NULL;
 553        n = read(fd, buf, sizeof(buf)-1);
 554        close(fd);
 555        if (n < 4)      /* at least '#!/x' and not error */
 556                return NULL;
 557
 558        if (buf[0] != '#' || buf[1] != '!')
 559                return NULL;
 560        buf[n] = '\0';
 561        p = buf + strcspn(buf, "\r\n");
 562        if (!*p)
 563                return NULL;
 564
 565        *p = '\0';
 566        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 567                return NULL;
 568        /* strip options */
 569        if ((opt = strchr(p+1, ' ')))
 570                *opt = '\0';
 571        return p+1;
 572}
 573
 574/*
 575 * Splits the PATH into parts.
 576 */
 577static char **get_path_split(void)
 578{
 579        char *p, **path, *envpath = getenv("PATH");
 580        int i, n = 0;
 581
 582        if (!envpath || !*envpath)
 583                return NULL;
 584
 585        envpath = xstrdup(envpath);
 586        p = envpath;
 587        while (p) {
 588                char *dir = p;
 589                p = strchr(p, ';');
 590                if (p) *p++ = '\0';
 591                if (*dir) {     /* not earlier, catches series of ; */
 592                        ++n;
 593                }
 594        }
 595        if (!n)
 596                return NULL;
 597
 598        path = xmalloc((n+1)*sizeof(char *));
 599        p = envpath;
 600        i = 0;
 601        do {
 602                if (*p)
 603                        path[i++] = xstrdup(p);
 604                p = p+strlen(p)+1;
 605        } while (i < n);
 606        path[i] = NULL;
 607
 608        free(envpath);
 609
 610        return path;
 611}
 612
 613static void free_path_split(char **path)
 614{
 615        char **p = path;
 616
 617        if (!path)
 618                return;
 619
 620        while (*p)
 621                free(*p++);
 622        free(path);
 623}
 624
 625/*
 626 * exe_only means that we only want to detect .exe files, but not scripts
 627 * (which do not have an extension)
 628 */
 629static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 630{
 631        char path[MAX_PATH];
 632        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 633
 634        if (!isexe && access(path, F_OK) == 0)
 635                return xstrdup(path);
 636        path[strlen(path)-4] = '\0';
 637        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 638                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 639                        return xstrdup(path);
 640        return NULL;
 641}
 642
 643/*
 644 * Determines the absolute path of cmd using the the split path in path.
 645 * If cmd contains a slash or backslash, no lookup is performed.
 646 */
 647static char *path_lookup(const char *cmd, char **path, int exe_only)
 648{
 649        char *prog = NULL;
 650        int len = strlen(cmd);
 651        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 652
 653        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 654                prog = xstrdup(cmd);
 655
 656        while (!prog && *path)
 657                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 658
 659        return prog;
 660}
 661
 662static int env_compare(const void *a, const void *b)
 663{
 664        char *const *ea = a;
 665        char *const *eb = b;
 666        return strcasecmp(*ea, *eb);
 667}
 668
 669static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 670                              const char *dir,
 671                              int prepend_cmd, int fhin, int fhout, int fherr)
 672{
 673        STARTUPINFO si;
 674        PROCESS_INFORMATION pi;
 675        struct strbuf envblk, args;
 676        unsigned flags;
 677        BOOL ret;
 678
 679        /* Determine whether or not we are associated to a console */
 680        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 681                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 682                        FILE_ATTRIBUTE_NORMAL, NULL);
 683        if (cons == INVALID_HANDLE_VALUE) {
 684                /* There is no console associated with this process.
 685                 * Since the child is a console process, Windows
 686                 * would normally create a console window. But
 687                 * since we'll be redirecting std streams, we do
 688                 * not need the console.
 689                 * It is necessary to use DETACHED_PROCESS
 690                 * instead of CREATE_NO_WINDOW to make ssh
 691                 * recognize that it has no console.
 692                 */
 693                flags = DETACHED_PROCESS;
 694        } else {
 695                /* There is already a console. If we specified
 696                 * DETACHED_PROCESS here, too, Windows would
 697                 * disassociate the child from the console.
 698                 * The same is true for CREATE_NO_WINDOW.
 699                 * Go figure!
 700                 */
 701                flags = 0;
 702                CloseHandle(cons);
 703        }
 704        memset(&si, 0, sizeof(si));
 705        si.cb = sizeof(si);
 706        si.dwFlags = STARTF_USESTDHANDLES;
 707        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 708        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 709        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 710
 711        /* concatenate argv, quoting args as we go */
 712        strbuf_init(&args, 0);
 713        if (prepend_cmd) {
 714                char *quoted = (char *)quote_arg(cmd);
 715                strbuf_addstr(&args, quoted);
 716                if (quoted != cmd)
 717                        free(quoted);
 718        }
 719        for (; *argv; argv++) {
 720                char *quoted = (char *)quote_arg(*argv);
 721                if (*args.buf)
 722                        strbuf_addch(&args, ' ');
 723                strbuf_addstr(&args, quoted);
 724                if (quoted != *argv)
 725                        free(quoted);
 726        }
 727
 728        if (env) {
 729                int count = 0;
 730                char **e, **sorted_env;
 731
 732                for (e = env; *e; e++)
 733                        count++;
 734
 735                /* environment must be sorted */
 736                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 737                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 738                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 739
 740                strbuf_init(&envblk, 0);
 741                for (e = sorted_env; *e; e++) {
 742                        strbuf_addstr(&envblk, *e);
 743                        strbuf_addch(&envblk, '\0');
 744                }
 745                free(sorted_env);
 746        }
 747
 748        memset(&pi, 0, sizeof(pi));
 749        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 750                env ? envblk.buf : NULL, dir, &si, &pi);
 751
 752        if (env)
 753                strbuf_release(&envblk);
 754        strbuf_release(&args);
 755
 756        if (!ret) {
 757                errno = ENOENT;
 758                return -1;
 759        }
 760        CloseHandle(pi.hThread);
 761        return (pid_t)pi.hProcess;
 762}
 763
 764static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 765                           int prepend_cmd)
 766{
 767        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 768}
 769
 770pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 771                     const char *dir,
 772                     int fhin, int fhout, int fherr)
 773{
 774        pid_t pid;
 775        char **path = get_path_split();
 776        char *prog = path_lookup(cmd, path, 0);
 777
 778        if (!prog) {
 779                errno = ENOENT;
 780                pid = -1;
 781        }
 782        else {
 783                const char *interpr = parse_interpreter(prog);
 784
 785                if (interpr) {
 786                        const char *argv0 = argv[0];
 787                        char *iprog = path_lookup(interpr, path, 1);
 788                        argv[0] = prog;
 789                        if (!iprog) {
 790                                errno = ENOENT;
 791                                pid = -1;
 792                        }
 793                        else {
 794                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 795                                                       fhin, fhout, fherr);
 796                                free(iprog);
 797                        }
 798                        argv[0] = argv0;
 799                }
 800                else
 801                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 802                                               fhin, fhout, fherr);
 803                free(prog);
 804        }
 805        free_path_split(path);
 806        return pid;
 807}
 808
 809static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 810{
 811        const char *interpr = parse_interpreter(cmd);
 812        char **path;
 813        char *prog;
 814        int pid = 0;
 815
 816        if (!interpr)
 817                return 0;
 818        path = get_path_split();
 819        prog = path_lookup(interpr, path, 1);
 820        if (prog) {
 821                int argc = 0;
 822                const char **argv2;
 823                while (argv[argc]) argc++;
 824                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 825                argv2[0] = (char *)cmd; /* full path to the script file */
 826                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 827                pid = mingw_spawnve(prog, argv2, env, 1);
 828                if (pid >= 0) {
 829                        int status;
 830                        if (waitpid(pid, &status, 0) < 0)
 831                                status = 255;
 832                        exit(status);
 833                }
 834                pid = 1;        /* indicate that we tried but failed */
 835                free(prog);
 836                free(argv2);
 837        }
 838        free_path_split(path);
 839        return pid;
 840}
 841
 842static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 843{
 844        /* check if git_command is a shell script */
 845        if (!try_shell_exec(cmd, argv, (char **)env)) {
 846                int pid, status;
 847
 848                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 849                if (pid < 0)
 850                        return;
 851                if (waitpid(pid, &status, 0) < 0)
 852                        status = 255;
 853                exit(status);
 854        }
 855}
 856
 857void mingw_execvp(const char *cmd, char *const *argv)
 858{
 859        char **path = get_path_split();
 860        char *prog = path_lookup(cmd, path, 0);
 861
 862        if (prog) {
 863                mingw_execve(prog, argv, environ);
 864                free(prog);
 865        } else
 866                errno = ENOENT;
 867
 868        free_path_split(path);
 869}
 870
 871static char **copy_environ(void)
 872{
 873        char **env;
 874        int i = 0;
 875        while (environ[i])
 876                i++;
 877        env = xmalloc((i+1)*sizeof(*env));
 878        for (i = 0; environ[i]; i++)
 879                env[i] = xstrdup(environ[i]);
 880        env[i] = NULL;
 881        return env;
 882}
 883
 884void free_environ(char **env)
 885{
 886        int i;
 887        for (i = 0; env[i]; i++)
 888                free(env[i]);
 889        free(env);
 890}
 891
 892static int lookup_env(char **env, const char *name, size_t nmln)
 893{
 894        int i;
 895
 896        for (i = 0; env[i]; i++) {
 897                if (0 == strncmp(env[i], name, nmln)
 898                    && '=' == env[i][nmln])
 899                        /* matches */
 900                        return i;
 901        }
 902        return -1;
 903}
 904
 905/*
 906 * If name contains '=', then sets the variable, otherwise it unsets it
 907 */
 908static char **env_setenv(char **env, const char *name)
 909{
 910        char *eq = strchrnul(name, '=');
 911        int i = lookup_env(env, name, eq-name);
 912
 913        if (i < 0) {
 914                if (*eq) {
 915                        for (i = 0; env[i]; i++)
 916                                ;
 917                        env = xrealloc(env, (i+2)*sizeof(*env));
 918                        env[i] = xstrdup(name);
 919                        env[i+1] = NULL;
 920                }
 921        }
 922        else {
 923                free(env[i]);
 924                if (*eq)
 925                        env[i] = xstrdup(name);
 926                else
 927                        for (; env[i]; i++)
 928                                env[i] = env[i+1];
 929        }
 930        return env;
 931}
 932
 933/*
 934 * Copies global environ and adjusts variables as specified by vars.
 935 */
 936char **make_augmented_environ(const char *const *vars)
 937{
 938        char **env = copy_environ();
 939
 940        while (*vars)
 941                env = env_setenv(env, *vars++);
 942        return env;
 943}
 944
 945/*
 946 * Note, this isn't a complete replacement for getaddrinfo. It assumes
 947 * that service contains a numerical port, or that it it is null. It
 948 * does a simple search using gethostbyname, and returns one IPv4 host
 949 * if one was found.
 950 */
 951static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 952                                   const struct addrinfo *hints,
 953                                   struct addrinfo **res)
 954{
 955        struct hostent *h = gethostbyname(node);
 956        struct addrinfo *ai;
 957        struct sockaddr_in *sin;
 958
 959        if (!h)
 960                return WSAGetLastError();
 961
 962        ai = xmalloc(sizeof(struct addrinfo));
 963        *res = ai;
 964        ai->ai_flags = 0;
 965        ai->ai_family = AF_INET;
 966        ai->ai_socktype = hints->ai_socktype;
 967        switch (hints->ai_socktype) {
 968        case SOCK_STREAM:
 969                ai->ai_protocol = IPPROTO_TCP;
 970                break;
 971        case SOCK_DGRAM:
 972                ai->ai_protocol = IPPROTO_UDP;
 973                break;
 974        default:
 975                ai->ai_protocol = 0;
 976                break;
 977        }
 978        ai->ai_addrlen = sizeof(struct sockaddr_in);
 979        ai->ai_canonname = strdup(h->h_name);
 980
 981        sin = xmalloc(ai->ai_addrlen);
 982        memset(sin, 0, ai->ai_addrlen);
 983        sin->sin_family = AF_INET;
 984        if (service)
 985                sin->sin_port = htons(atoi(service));
 986        sin->sin_addr = *(struct in_addr *)h->h_addr;
 987        ai->ai_addr = (struct sockaddr *)sin;
 988        ai->ai_next = 0;
 989        return 0;
 990}
 991
 992static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 993{
 994        free(res->ai_canonname);
 995        free(res->ai_addr);
 996        free(res);
 997}
 998
 999static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1000                                   char *host, DWORD hostlen,
1001                                   char *serv, DWORD servlen, int flags)
1002{
1003        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1004        if (sa->sa_family != AF_INET)
1005                return EAI_FAMILY;
1006        if (!host && !serv)
1007                return EAI_NONAME;
1008
1009        if (host && hostlen > 0) {
1010                struct hostent *ent = NULL;
1011                if (!(flags & NI_NUMERICHOST))
1012                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1013                                            sizeof(sin->sin_addr), AF_INET);
1014
1015                if (ent)
1016                        snprintf(host, hostlen, "%s", ent->h_name);
1017                else if (flags & NI_NAMEREQD)
1018                        return EAI_NONAME;
1019                else
1020                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1021        }
1022
1023        if (serv && servlen > 0) {
1024                struct servent *ent = NULL;
1025                if (!(flags & NI_NUMERICSERV))
1026                        ent = getservbyport(sin->sin_port,
1027                                            flags & NI_DGRAM ? "udp" : "tcp");
1028
1029                if (ent)
1030                        snprintf(serv, servlen, "%s", ent->s_name);
1031                else
1032                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1033        }
1034
1035        return 0;
1036}
1037
1038static HMODULE ipv6_dll = NULL;
1039static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1040static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1041                                      const struct addrinfo *hints,
1042                                      struct addrinfo **res);
1043static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1044                                      char *host, DWORD hostlen,
1045                                      char *serv, DWORD servlen, int flags);
1046/*
1047 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1048 * don't need to try to load that one dynamically.
1049 */
1050
1051static void socket_cleanup(void)
1052{
1053        WSACleanup();
1054        if (ipv6_dll)
1055                FreeLibrary(ipv6_dll);
1056        ipv6_dll = NULL;
1057        ipv6_freeaddrinfo = freeaddrinfo_stub;
1058        ipv6_getaddrinfo = getaddrinfo_stub;
1059        ipv6_getnameinfo = getnameinfo_stub;
1060}
1061
1062static void ensure_socket_initialization(void)
1063{
1064        WSADATA wsa;
1065        static int initialized = 0;
1066        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1067        const char **name;
1068
1069        if (initialized)
1070                return;
1071
1072        if (WSAStartup(MAKEWORD(2,2), &wsa))
1073                die("unable to initialize winsock subsystem, error %d",
1074                        WSAGetLastError());
1075
1076        for (name = libraries; *name; name++) {
1077                ipv6_dll = LoadLibrary(*name);
1078                if (!ipv6_dll)
1079                        continue;
1080
1081                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1082                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1083                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1084                                                   const struct addrinfo *,
1085                                                   struct addrinfo **))
1086                        GetProcAddress(ipv6_dll, "getaddrinfo");
1087                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1088                                                   socklen_t, char *, DWORD,
1089                                                   char *, DWORD, int))
1090                        GetProcAddress(ipv6_dll, "getnameinfo");
1091                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1092                        FreeLibrary(ipv6_dll);
1093                        ipv6_dll = NULL;
1094                } else
1095                        break;
1096        }
1097        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1098                ipv6_freeaddrinfo = freeaddrinfo_stub;
1099                ipv6_getaddrinfo = getaddrinfo_stub;
1100                ipv6_getnameinfo = getnameinfo_stub;
1101        }
1102
1103        atexit(socket_cleanup);
1104        initialized = 1;
1105}
1106
1107#undef gethostbyname
1108struct hostent *mingw_gethostbyname(const char *host)
1109{
1110        ensure_socket_initialization();
1111        return gethostbyname(host);
1112}
1113
1114void mingw_freeaddrinfo(struct addrinfo *res)
1115{
1116        ipv6_freeaddrinfo(res);
1117}
1118
1119int mingw_getaddrinfo(const char *node, const char *service,
1120                      const struct addrinfo *hints, struct addrinfo **res)
1121{
1122        ensure_socket_initialization();
1123        return ipv6_getaddrinfo(node, service, hints, res);
1124}
1125
1126int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1127                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1128                      int flags)
1129{
1130        ensure_socket_initialization();
1131        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1132}
1133
1134int mingw_socket(int domain, int type, int protocol)
1135{
1136        int sockfd;
1137        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1138        if (s == INVALID_SOCKET) {
1139                /*
1140                 * WSAGetLastError() values are regular BSD error codes
1141                 * biased by WSABASEERR.
1142                 * However, strerror() does not know about networking
1143                 * specific errors, which are values beginning at 38 or so.
1144                 * Therefore, we choose to leave the biased error code
1145                 * in errno so that _if_ someone looks up the code somewhere,
1146                 * then it is at least the number that are usually listed.
1147                 */
1148                errno = WSAGetLastError();
1149                return -1;
1150        }
1151        /* convert into a file descriptor */
1152        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1153                closesocket(s);
1154                return error("unable to make a socket file descriptor: %s",
1155                        strerror(errno));
1156        }
1157        return sockfd;
1158}
1159
1160#undef connect
1161int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1162{
1163        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1164        return connect(s, sa, sz);
1165}
1166
1167#undef rename
1168int mingw_rename(const char *pold, const char *pnew)
1169{
1170        DWORD attrs, gle;
1171        int tries = 0;
1172        static const int delay[] = { 0, 1, 10, 20, 40 };
1173
1174        /*
1175         * Try native rename() first to get errno right.
1176         * It is based on MoveFile(), which cannot overwrite existing files.
1177         */
1178        if (!rename(pold, pnew))
1179                return 0;
1180        if (errno != EEXIST)
1181                return -1;
1182repeat:
1183        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1184                return 0;
1185        /* TODO: translate more errors */
1186        gle = GetLastError();
1187        if (gle == ERROR_ACCESS_DENIED &&
1188            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1189                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1190                        errno = EISDIR;
1191                        return -1;
1192                }
1193                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1194                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1195                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1196                                return 0;
1197                        gle = GetLastError();
1198                        /* revert file attributes on failure */
1199                        SetFileAttributes(pnew, attrs);
1200                }
1201        }
1202        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1203                /*
1204                 * We assume that some other process had the source or
1205                 * destination file open at the wrong moment and retry.
1206                 * In order to give the other process a higher chance to
1207                 * complete its operation, we give up our time slice now.
1208                 * If we have to retry again, we do sleep a bit.
1209                 */
1210                Sleep(delay[tries]);
1211                tries++;
1212                goto repeat;
1213        }
1214        errno = EACCES;
1215        return -1;
1216}
1217
1218/*
1219 * Note that this doesn't return the actual pagesize, but
1220 * the allocation granularity. If future Windows specific git code
1221 * needs the real getpagesize function, we need to find another solution.
1222 */
1223int mingw_getpagesize(void)
1224{
1225        SYSTEM_INFO si;
1226        GetSystemInfo(&si);
1227        return si.dwAllocationGranularity;
1228}
1229
1230struct passwd *getpwuid(int uid)
1231{
1232        static char user_name[100];
1233        static struct passwd p;
1234
1235        DWORD len = sizeof(user_name);
1236        if (!GetUserName(user_name, &len))
1237                return NULL;
1238        p.pw_name = user_name;
1239        p.pw_gecos = "unknown";
1240        p.pw_dir = NULL;
1241        return &p;
1242}
1243
1244static HANDLE timer_event;
1245static HANDLE timer_thread;
1246static int timer_interval;
1247static int one_shot;
1248static sig_handler_t timer_fn = SIG_DFL;
1249
1250/* The timer works like this:
1251 * The thread, ticktack(), is a trivial routine that most of the time
1252 * only waits to receive the signal to terminate. The main thread tells
1253 * the thread to terminate by setting the timer_event to the signalled
1254 * state.
1255 * But ticktack() interrupts the wait state after the timer's interval
1256 * length to call the signal handler.
1257 */
1258
1259static unsigned __stdcall ticktack(void *dummy)
1260{
1261        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1262                if (timer_fn == SIG_DFL)
1263                        die("Alarm");
1264                if (timer_fn != SIG_IGN)
1265                        timer_fn(SIGALRM);
1266                if (one_shot)
1267                        break;
1268        }
1269        return 0;
1270}
1271
1272static int start_timer_thread(void)
1273{
1274        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1275        if (timer_event) {
1276                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1277                if (!timer_thread )
1278                        return errno = ENOMEM,
1279                                error("cannot start timer thread");
1280        } else
1281                return errno = ENOMEM,
1282                        error("cannot allocate resources for timer");
1283        return 0;
1284}
1285
1286static void stop_timer_thread(void)
1287{
1288        if (timer_event)
1289                SetEvent(timer_event);  /* tell thread to terminate */
1290        if (timer_thread) {
1291                int rc = WaitForSingleObject(timer_thread, 1000);
1292                if (rc == WAIT_TIMEOUT)
1293                        error("timer thread did not terminate timely");
1294                else if (rc != WAIT_OBJECT_0)
1295                        error("waiting for timer thread failed: %lu",
1296                              GetLastError());
1297                CloseHandle(timer_thread);
1298        }
1299        if (timer_event)
1300                CloseHandle(timer_event);
1301        timer_event = NULL;
1302        timer_thread = NULL;
1303}
1304
1305static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1306{
1307        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1308}
1309
1310int setitimer(int type, struct itimerval *in, struct itimerval *out)
1311{
1312        static const struct timeval zero;
1313        static int atexit_done;
1314
1315        if (out != NULL)
1316                return errno = EINVAL,
1317                        error("setitimer param 3 != NULL not implemented");
1318        if (!is_timeval_eq(&in->it_interval, &zero) &&
1319            !is_timeval_eq(&in->it_interval, &in->it_value))
1320                return errno = EINVAL,
1321                        error("setitimer: it_interval must be zero or eq it_value");
1322
1323        if (timer_thread)
1324                stop_timer_thread();
1325
1326        if (is_timeval_eq(&in->it_value, &zero) &&
1327            is_timeval_eq(&in->it_interval, &zero))
1328                return 0;
1329
1330        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1331        one_shot = is_timeval_eq(&in->it_interval, &zero);
1332        if (!atexit_done) {
1333                atexit(stop_timer_thread);
1334                atexit_done = 1;
1335        }
1336        return start_timer_thread();
1337}
1338
1339int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1340{
1341        if (sig != SIGALRM)
1342                return errno = EINVAL,
1343                        error("sigaction only implemented for SIGALRM");
1344        if (out != NULL)
1345                return errno = EINVAL,
1346                        error("sigaction: param 3 != NULL not implemented");
1347
1348        timer_fn = in->sa_handler;
1349        return 0;
1350}
1351
1352#undef signal
1353sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1354{
1355        sig_handler_t old = timer_fn;
1356        if (sig != SIGALRM)
1357                return signal(sig, handler);
1358        timer_fn = handler;
1359        return old;
1360}
1361
1362static const char *make_backslash_path(const char *path)
1363{
1364        static char buf[PATH_MAX + 1];
1365        char *c;
1366
1367        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1368                die("Too long path: %.*s", 60, path);
1369
1370        for (c = buf; *c; c++) {
1371                if (*c == '/')
1372                        *c = '\\';
1373        }
1374        return buf;
1375}
1376
1377void mingw_open_html(const char *unixpath)
1378{
1379        const char *htmlpath = make_backslash_path(unixpath);
1380        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1381                        const char *, const char *, const char *, INT);
1382        T ShellExecute;
1383        HMODULE shell32;
1384
1385        shell32 = LoadLibrary("shell32.dll");
1386        if (!shell32)
1387                die("cannot load shell32.dll");
1388        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1389        if (!ShellExecute)
1390                die("cannot run browser");
1391
1392        printf("Launching default browser to display HTML ...\n");
1393        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1394
1395        FreeLibrary(shell32);
1396}
1397
1398int link(const char *oldpath, const char *newpath)
1399{
1400        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1401        static T create_hard_link = NULL;
1402        if (!create_hard_link) {
1403                create_hard_link = (T) GetProcAddress(
1404                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1405                if (!create_hard_link)
1406                        create_hard_link = (T)-1;
1407        }
1408        if (create_hard_link == (T)-1) {
1409                errno = ENOSYS;
1410                return -1;
1411        }
1412        if (!create_hard_link(newpath, oldpath, NULL)) {
1413                errno = err_win_to_posix(GetLastError());
1414                return -1;
1415        }
1416        return 0;
1417}
1418
1419char *getpass(const char *prompt)
1420{
1421        struct strbuf buf = STRBUF_INIT;
1422
1423        fputs(prompt, stderr);
1424        for (;;) {
1425                char c = _getch();
1426                if (c == '\r' || c == '\n')
1427                        break;
1428                strbuf_addch(&buf, c);
1429        }
1430        fputs("\n", stderr);
1431        return strbuf_detach(&buf, NULL);
1432}
1433
1434#ifndef NO_MINGW_REPLACE_READDIR
1435/* MinGW readdir implementation to avoid extra lstats for Git */
1436struct mingw_DIR
1437{
1438        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1439        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1440        long                    dd_handle;      /* _findnext handle */
1441        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1442        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1443};
1444
1445struct dirent *mingw_readdir(DIR *dir)
1446{
1447        WIN32_FIND_DATAA buf;
1448        HANDLE handle;
1449        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1450
1451        if (!dir->dd_handle) {
1452                errno = EBADF; /* No set_errno for mingw */
1453                return NULL;
1454        }
1455
1456        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1457        {
1458                DWORD lasterr;
1459                handle = FindFirstFileA(dir->dd_name, &buf);
1460                lasterr = GetLastError();
1461                dir->dd_handle = (long)handle;
1462                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1463                        errno = err_win_to_posix(lasterr);
1464                        return NULL;
1465                }
1466        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1467                return NULL;
1468        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1469                DWORD lasterr = GetLastError();
1470                FindClose((HANDLE)dir->dd_handle);
1471                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1472                /* POSIX says you shouldn't set errno when readdir can't
1473                   find any more files; so, if another error we leave it set. */
1474                if (lasterr != ERROR_NO_MORE_FILES)
1475                        errno = err_win_to_posix(lasterr);
1476                return NULL;
1477        }
1478
1479        /* We get here if `buf' contains valid data.  */
1480        strcpy(dir->dd_dir.d_name, buf.cFileName);
1481        ++dir->dd_stat;
1482
1483        /* Set file type, based on WIN32_FIND_DATA */
1484        mdir->dd_dir.d_type = 0;
1485        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1486                mdir->dd_dir.d_type |= DT_DIR;
1487        else
1488                mdir->dd_dir.d_type |= DT_REG;
1489
1490        return (struct dirent*)&dir->dd_dir;
1491}
1492#endif // !NO_MINGW_REPLACE_READDIR