Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit Merge branch 'sn/doc-update-index-assume-unchanged' into maint-1.7.3 (eb4e672)
   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        int err;
 199        WIN32_FILE_ATTRIBUTE_DATA fdata;
 200
 201        if (!(err = get_file_attr(file_name, &fdata))) {
 202                buf->st_ino = 0;
 203                buf->st_gid = 0;
 204                buf->st_uid = 0;
 205                buf->st_nlink = 1;
 206                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 207                buf->st_size = fdata.nFileSizeLow |
 208                        (((off_t)fdata.nFileSizeHigh)<<32);
 209                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 210                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 211                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 212                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 213                return 0;
 214        }
 215        errno = err;
 216        return -1;
 217}
 218
 219/* We provide our own lstat/fstat functions, since the provided
 220 * lstat/fstat functions are so slow. These stat functions are
 221 * tailored for Git's usage (read: fast), and are not meant to be
 222 * complete. Note that Git stat()s are redirected to mingw_lstat()
 223 * too, since Windows doesn't really handle symlinks that well.
 224 */
 225int mingw_lstat(const char *file_name, struct stat *buf)
 226{
 227        int namelen;
 228        static char alt_name[PATH_MAX];
 229
 230        if (!do_lstat(file_name, buf))
 231                return 0;
 232
 233        /* if file_name ended in a '/', Windows returned ENOENT;
 234         * try again without trailing slashes
 235         */
 236        if (errno != ENOENT)
 237                return -1;
 238
 239        namelen = strlen(file_name);
 240        if (namelen && file_name[namelen-1] != '/')
 241                return -1;
 242        while (namelen && file_name[namelen-1] == '/')
 243                --namelen;
 244        if (!namelen || namelen >= PATH_MAX)
 245                return -1;
 246
 247        memcpy(alt_name, file_name, namelen);
 248        alt_name[namelen] = 0;
 249        return do_lstat(alt_name, buf);
 250}
 251
 252#undef fstat
 253int mingw_fstat(int fd, struct stat *buf)
 254{
 255        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 256        BY_HANDLE_FILE_INFORMATION fdata;
 257
 258        if (fh == INVALID_HANDLE_VALUE) {
 259                errno = EBADF;
 260                return -1;
 261        }
 262        /* direct non-file handles to MS's fstat() */
 263        if (GetFileType(fh) != FILE_TYPE_DISK)
 264                return _fstati64(fd, buf);
 265
 266        if (GetFileInformationByHandle(fh, &fdata)) {
 267                buf->st_ino = 0;
 268                buf->st_gid = 0;
 269                buf->st_uid = 0;
 270                buf->st_nlink = 1;
 271                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 272                buf->st_size = fdata.nFileSizeLow |
 273                        (((off_t)fdata.nFileSizeHigh)<<32);
 274                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 275                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 276                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 277                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 278                return 0;
 279        }
 280        errno = EBADF;
 281        return -1;
 282}
 283
 284static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 285{
 286        long long winTime = t * 10000000LL + 116444736000000000LL;
 287        ft->dwLowDateTime = winTime;
 288        ft->dwHighDateTime = winTime >> 32;
 289}
 290
 291int mingw_utime (const char *file_name, const struct utimbuf *times)
 292{
 293        FILETIME mft, aft;
 294        int fh, rc;
 295
 296        /* must have write permission */
 297        DWORD attrs = GetFileAttributes(file_name);
 298        if (attrs != INVALID_FILE_ATTRIBUTES &&
 299            (attrs & FILE_ATTRIBUTE_READONLY)) {
 300                /* ignore errors here; open() will report them */
 301                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 302        }
 303
 304        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 305                rc = -1;
 306                goto revert_attrs;
 307        }
 308
 309        if (times) {
 310                time_t_to_filetime(times->modtime, &mft);
 311                time_t_to_filetime(times->actime, &aft);
 312        } else {
 313                GetSystemTimeAsFileTime(&mft);
 314                aft = mft;
 315        }
 316        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 317                errno = EINVAL;
 318                rc = -1;
 319        } else
 320                rc = 0;
 321        close(fh);
 322
 323revert_attrs:
 324        if (attrs != INVALID_FILE_ATTRIBUTES &&
 325            (attrs & FILE_ATTRIBUTE_READONLY)) {
 326                /* ignore errors again */
 327                SetFileAttributes(file_name, attrs);
 328        }
 329        return rc;
 330}
 331
 332unsigned int sleep (unsigned int seconds)
 333{
 334        Sleep(seconds*1000);
 335        return 0;
 336}
 337
 338int mkstemp(char *template)
 339{
 340        char *filename = mktemp(template);
 341        if (filename == NULL)
 342                return -1;
 343        return open(filename, O_RDWR | O_CREAT, 0600);
 344}
 345
 346int gettimeofday(struct timeval *tv, void *tz)
 347{
 348        FILETIME ft;
 349        long long hnsec;
 350
 351        GetSystemTimeAsFileTime(&ft);
 352        hnsec = filetime_to_hnsec(&ft);
 353        tv->tv_sec = hnsec / 10000000;
 354        tv->tv_usec = (hnsec % 10000000) / 10;
 355        return 0;
 356}
 357
 358int pipe(int filedes[2])
 359{
 360        HANDLE h[2];
 361
 362        /* this creates non-inheritable handles */
 363        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 364                errno = err_win_to_posix(GetLastError());
 365                return -1;
 366        }
 367        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 368        if (filedes[0] < 0) {
 369                CloseHandle(h[0]);
 370                CloseHandle(h[1]);
 371                return -1;
 372        }
 373        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 374        if (filedes[0] < 0) {
 375                close(filedes[0]);
 376                CloseHandle(h[1]);
 377                return -1;
 378        }
 379        return 0;
 380}
 381
 382int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 383{
 384        int i, pending;
 385
 386        if (timeout >= 0) {
 387                if (nfds == 0) {
 388                        Sleep(timeout);
 389                        return 0;
 390                }
 391                return errno = EINVAL, error("poll timeout not supported");
 392        }
 393
 394        /* When there is only one fd to wait for, then we pretend that
 395         * input is available and let the actual wait happen when the
 396         * caller invokes read().
 397         */
 398        if (nfds == 1) {
 399                if (!(ufds[0].events & POLLIN))
 400                        return errno = EINVAL, error("POLLIN not set");
 401                ufds[0].revents = POLLIN;
 402                return 0;
 403        }
 404
 405repeat:
 406        pending = 0;
 407        for (i = 0; i < nfds; i++) {
 408                DWORD avail = 0;
 409                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 410                if (h == INVALID_HANDLE_VALUE)
 411                        return -1;      /* errno was set */
 412
 413                if (!(ufds[i].events & POLLIN))
 414                        return errno = EINVAL, error("POLLIN not set");
 415
 416                /* this emulation works only for pipes */
 417                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 418                        int err = GetLastError();
 419                        if (err == ERROR_BROKEN_PIPE) {
 420                                ufds[i].revents = POLLHUP;
 421                                pending++;
 422                        } else {
 423                                errno = EINVAL;
 424                                return error("PeekNamedPipe failed,"
 425                                        " GetLastError: %u", err);
 426                        }
 427                } else if (avail) {
 428                        ufds[i].revents = POLLIN;
 429                        pending++;
 430                } else
 431                        ufds[i].revents = 0;
 432        }
 433        if (!pending) {
 434                /* The only times that we spin here is when the process
 435                 * that is connected through the pipes is waiting for
 436                 * its own input data to become available. But since
 437                 * the process (pack-objects) is itself CPU intensive,
 438                 * it will happily pick up the time slice that we are
 439                 * relinquishing here.
 440                 */
 441                Sleep(0);
 442                goto repeat;
 443        }
 444        return 0;
 445}
 446
 447struct tm *gmtime_r(const time_t *timep, struct tm *result)
 448{
 449        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 450        memcpy(result, gmtime(timep), sizeof(struct tm));
 451        return result;
 452}
 453
 454struct tm *localtime_r(const time_t *timep, struct tm *result)
 455{
 456        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 457        memcpy(result, localtime(timep), sizeof(struct tm));
 458        return result;
 459}
 460
 461#undef getcwd
 462char *mingw_getcwd(char *pointer, int len)
 463{
 464        int i;
 465        char *ret = getcwd(pointer, len);
 466        if (!ret)
 467                return ret;
 468        for (i = 0; pointer[i]; i++)
 469                if (pointer[i] == '\\')
 470                        pointer[i] = '/';
 471        return ret;
 472}
 473
 474#undef getenv
 475char *mingw_getenv(const char *name)
 476{
 477        char *result = getenv(name);
 478        if (!result && !strcmp(name, "TMPDIR")) {
 479                /* on Windows it is TMP and TEMP */
 480                result = getenv("TMP");
 481                if (!result)
 482                        result = getenv("TEMP");
 483        }
 484        return result;
 485}
 486
 487/*
 488 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 489 * (Parsing C++ Command-Line Arguments)
 490 */
 491static const char *quote_arg(const char *arg)
 492{
 493        /* count chars to quote */
 494        int len = 0, n = 0;
 495        int force_quotes = 0;
 496        char *q, *d;
 497        const char *p = arg;
 498        if (!*p) force_quotes = 1;
 499        while (*p) {
 500                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 501                        force_quotes = 1;
 502                else if (*p == '"')
 503                        n++;
 504                else if (*p == '\\') {
 505                        int count = 0;
 506                        while (*p == '\\') {
 507                                count++;
 508                                p++;
 509                                len++;
 510                        }
 511                        if (*p == '"')
 512                                n += count*2 + 1;
 513                        continue;
 514                }
 515                len++;
 516                p++;
 517        }
 518        if (!force_quotes && n == 0)
 519                return arg;
 520
 521        /* insert \ where necessary */
 522        d = q = xmalloc(len+n+3);
 523        *d++ = '"';
 524        while (*arg) {
 525                if (*arg == '"')
 526                        *d++ = '\\';
 527                else if (*arg == '\\') {
 528                        int count = 0;
 529                        while (*arg == '\\') {
 530                                count++;
 531                                *d++ = *arg++;
 532                        }
 533                        if (*arg == '"') {
 534                                while (count-- > 0)
 535                                        *d++ = '\\';
 536                                *d++ = '\\';
 537                        }
 538                }
 539                *d++ = *arg++;
 540        }
 541        *d++ = '"';
 542        *d++ = 0;
 543        return q;
 544}
 545
 546static const char *parse_interpreter(const char *cmd)
 547{
 548        static char buf[100];
 549        char *p, *opt;
 550        int n, fd;
 551
 552        /* don't even try a .exe */
 553        n = strlen(cmd);
 554        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 555                return NULL;
 556
 557        fd = open(cmd, O_RDONLY);
 558        if (fd < 0)
 559                return NULL;
 560        n = read(fd, buf, sizeof(buf)-1);
 561        close(fd);
 562        if (n < 4)      /* at least '#!/x' and not error */
 563                return NULL;
 564
 565        if (buf[0] != '#' || buf[1] != '!')
 566                return NULL;
 567        buf[n] = '\0';
 568        p = buf + strcspn(buf, "\r\n");
 569        if (!*p)
 570                return NULL;
 571
 572        *p = '\0';
 573        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 574                return NULL;
 575        /* strip options */
 576        if ((opt = strchr(p+1, ' ')))
 577                *opt = '\0';
 578        return p+1;
 579}
 580
 581/*
 582 * Splits the PATH into parts.
 583 */
 584static char **get_path_split(void)
 585{
 586        char *p, **path, *envpath = getenv("PATH");
 587        int i, n = 0;
 588
 589        if (!envpath || !*envpath)
 590                return NULL;
 591
 592        envpath = xstrdup(envpath);
 593        p = envpath;
 594        while (p) {
 595                char *dir = p;
 596                p = strchr(p, ';');
 597                if (p) *p++ = '\0';
 598                if (*dir) {     /* not earlier, catches series of ; */
 599                        ++n;
 600                }
 601        }
 602        if (!n)
 603                return NULL;
 604
 605        path = xmalloc((n+1)*sizeof(char *));
 606        p = envpath;
 607        i = 0;
 608        do {
 609                if (*p)
 610                        path[i++] = xstrdup(p);
 611                p = p+strlen(p)+1;
 612        } while (i < n);
 613        path[i] = NULL;
 614
 615        free(envpath);
 616
 617        return path;
 618}
 619
 620static void free_path_split(char **path)
 621{
 622        char **p = path;
 623
 624        if (!path)
 625                return;
 626
 627        while (*p)
 628                free(*p++);
 629        free(path);
 630}
 631
 632/*
 633 * exe_only means that we only want to detect .exe files, but not scripts
 634 * (which do not have an extension)
 635 */
 636static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 637{
 638        char path[MAX_PATH];
 639        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 640
 641        if (!isexe && access(path, F_OK) == 0)
 642                return xstrdup(path);
 643        path[strlen(path)-4] = '\0';
 644        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 645                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 646                        return xstrdup(path);
 647        return NULL;
 648}
 649
 650/*
 651 * Determines the absolute path of cmd using the split path in path.
 652 * If cmd contains a slash or backslash, no lookup is performed.
 653 */
 654static char *path_lookup(const char *cmd, char **path, int exe_only)
 655{
 656        char *prog = NULL;
 657        int len = strlen(cmd);
 658        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 659
 660        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 661                prog = xstrdup(cmd);
 662
 663        while (!prog && *path)
 664                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 665
 666        return prog;
 667}
 668
 669static int env_compare(const void *a, const void *b)
 670{
 671        char *const *ea = a;
 672        char *const *eb = b;
 673        return strcasecmp(*ea, *eb);
 674}
 675
 676static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 677                              const char *dir,
 678                              int prepend_cmd, int fhin, int fhout, int fherr)
 679{
 680        STARTUPINFO si;
 681        PROCESS_INFORMATION pi;
 682        struct strbuf envblk, args;
 683        unsigned flags;
 684        BOOL ret;
 685
 686        /* Determine whether or not we are associated to a console */
 687        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 688                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 689                        FILE_ATTRIBUTE_NORMAL, NULL);
 690        if (cons == INVALID_HANDLE_VALUE) {
 691                /* There is no console associated with this process.
 692                 * Since the child is a console process, Windows
 693                 * would normally create a console window. But
 694                 * since we'll be redirecting std streams, we do
 695                 * not need the console.
 696                 * It is necessary to use DETACHED_PROCESS
 697                 * instead of CREATE_NO_WINDOW to make ssh
 698                 * recognize that it has no console.
 699                 */
 700                flags = DETACHED_PROCESS;
 701        } else {
 702                /* There is already a console. If we specified
 703                 * DETACHED_PROCESS here, too, Windows would
 704                 * disassociate the child from the console.
 705                 * The same is true for CREATE_NO_WINDOW.
 706                 * Go figure!
 707                 */
 708                flags = 0;
 709                CloseHandle(cons);
 710        }
 711        memset(&si, 0, sizeof(si));
 712        si.cb = sizeof(si);
 713        si.dwFlags = STARTF_USESTDHANDLES;
 714        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 715        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 716        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 717
 718        /* concatenate argv, quoting args as we go */
 719        strbuf_init(&args, 0);
 720        if (prepend_cmd) {
 721                char *quoted = (char *)quote_arg(cmd);
 722                strbuf_addstr(&args, quoted);
 723                if (quoted != cmd)
 724                        free(quoted);
 725        }
 726        for (; *argv; argv++) {
 727                char *quoted = (char *)quote_arg(*argv);
 728                if (*args.buf)
 729                        strbuf_addch(&args, ' ');
 730                strbuf_addstr(&args, quoted);
 731                if (quoted != *argv)
 732                        free(quoted);
 733        }
 734
 735        if (env) {
 736                int count = 0;
 737                char **e, **sorted_env;
 738
 739                for (e = env; *e; e++)
 740                        count++;
 741
 742                /* environment must be sorted */
 743                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 744                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 745                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 746
 747                strbuf_init(&envblk, 0);
 748                for (e = sorted_env; *e; e++) {
 749                        strbuf_addstr(&envblk, *e);
 750                        strbuf_addch(&envblk, '\0');
 751                }
 752                free(sorted_env);
 753        }
 754
 755        memset(&pi, 0, sizeof(pi));
 756        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 757                env ? envblk.buf : NULL, dir, &si, &pi);
 758
 759        if (env)
 760                strbuf_release(&envblk);
 761        strbuf_release(&args);
 762
 763        if (!ret) {
 764                errno = ENOENT;
 765                return -1;
 766        }
 767        CloseHandle(pi.hThread);
 768        return (pid_t)pi.hProcess;
 769}
 770
 771static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 772                           int prepend_cmd)
 773{
 774        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 775}
 776
 777pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 778                     const char *dir,
 779                     int fhin, int fhout, int fherr)
 780{
 781        pid_t pid;
 782        char **path = get_path_split();
 783        char *prog = path_lookup(cmd, path, 0);
 784
 785        if (!prog) {
 786                errno = ENOENT;
 787                pid = -1;
 788        }
 789        else {
 790                const char *interpr = parse_interpreter(prog);
 791
 792                if (interpr) {
 793                        const char *argv0 = argv[0];
 794                        char *iprog = path_lookup(interpr, path, 1);
 795                        argv[0] = prog;
 796                        if (!iprog) {
 797                                errno = ENOENT;
 798                                pid = -1;
 799                        }
 800                        else {
 801                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 802                                                       fhin, fhout, fherr);
 803                                free(iprog);
 804                        }
 805                        argv[0] = argv0;
 806                }
 807                else
 808                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 809                                               fhin, fhout, fherr);
 810                free(prog);
 811        }
 812        free_path_split(path);
 813        return pid;
 814}
 815
 816static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 817{
 818        const char *interpr = parse_interpreter(cmd);
 819        char **path;
 820        char *prog;
 821        int pid = 0;
 822
 823        if (!interpr)
 824                return 0;
 825        path = get_path_split();
 826        prog = path_lookup(interpr, path, 1);
 827        if (prog) {
 828                int argc = 0;
 829                const char **argv2;
 830                while (argv[argc]) argc++;
 831                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 832                argv2[0] = (char *)cmd; /* full path to the script file */
 833                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 834                pid = mingw_spawnve(prog, argv2, env, 1);
 835                if (pid >= 0) {
 836                        int status;
 837                        if (waitpid(pid, &status, 0) < 0)
 838                                status = 255;
 839                        exit(status);
 840                }
 841                pid = 1;        /* indicate that we tried but failed */
 842                free(prog);
 843                free(argv2);
 844        }
 845        free_path_split(path);
 846        return pid;
 847}
 848
 849static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 850{
 851        /* check if git_command is a shell script */
 852        if (!try_shell_exec(cmd, argv, (char **)env)) {
 853                int pid, status;
 854
 855                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 856                if (pid < 0)
 857                        return;
 858                if (waitpid(pid, &status, 0) < 0)
 859                        status = 255;
 860                exit(status);
 861        }
 862}
 863
 864void mingw_execvp(const char *cmd, char *const *argv)
 865{
 866        char **path = get_path_split();
 867        char *prog = path_lookup(cmd, path, 0);
 868
 869        if (prog) {
 870                mingw_execve(prog, argv, environ);
 871                free(prog);
 872        } else
 873                errno = ENOENT;
 874
 875        free_path_split(path);
 876}
 877
 878static char **copy_environ(void)
 879{
 880        char **env;
 881        int i = 0;
 882        while (environ[i])
 883                i++;
 884        env = xmalloc((i+1)*sizeof(*env));
 885        for (i = 0; environ[i]; i++)
 886                env[i] = xstrdup(environ[i]);
 887        env[i] = NULL;
 888        return env;
 889}
 890
 891void free_environ(char **env)
 892{
 893        int i;
 894        for (i = 0; env[i]; i++)
 895                free(env[i]);
 896        free(env);
 897}
 898
 899static int lookup_env(char **env, const char *name, size_t nmln)
 900{
 901        int i;
 902
 903        for (i = 0; env[i]; i++) {
 904                if (0 == strncmp(env[i], name, nmln)
 905                    && '=' == env[i][nmln])
 906                        /* matches */
 907                        return i;
 908        }
 909        return -1;
 910}
 911
 912/*
 913 * If name contains '=', then sets the variable, otherwise it unsets it
 914 */
 915static char **env_setenv(char **env, const char *name)
 916{
 917        char *eq = strchrnul(name, '=');
 918        int i = lookup_env(env, name, eq-name);
 919
 920        if (i < 0) {
 921                if (*eq) {
 922                        for (i = 0; env[i]; i++)
 923                                ;
 924                        env = xrealloc(env, (i+2)*sizeof(*env));
 925                        env[i] = xstrdup(name);
 926                        env[i+1] = NULL;
 927                }
 928        }
 929        else {
 930                free(env[i]);
 931                if (*eq)
 932                        env[i] = xstrdup(name);
 933                else
 934                        for (; env[i]; i++)
 935                                env[i] = env[i+1];
 936        }
 937        return env;
 938}
 939
 940/*
 941 * Copies global environ and adjusts variables as specified by vars.
 942 */
 943char **make_augmented_environ(const char *const *vars)
 944{
 945        char **env = copy_environ();
 946
 947        while (*vars)
 948                env = env_setenv(env, *vars++);
 949        return env;
 950}
 951
 952/*
 953 * Note, this isn't a complete replacement for getaddrinfo. It assumes
 954 * that service contains a numerical port, or that it it is null. It
 955 * does a simple search using gethostbyname, and returns one IPv4 host
 956 * if one was found.
 957 */
 958static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 959                                   const struct addrinfo *hints,
 960                                   struct addrinfo **res)
 961{
 962        struct hostent *h = gethostbyname(node);
 963        struct addrinfo *ai;
 964        struct sockaddr_in *sin;
 965
 966        if (!h)
 967                return WSAGetLastError();
 968
 969        ai = xmalloc(sizeof(struct addrinfo));
 970        *res = ai;
 971        ai->ai_flags = 0;
 972        ai->ai_family = AF_INET;
 973        ai->ai_socktype = hints->ai_socktype;
 974        switch (hints->ai_socktype) {
 975        case SOCK_STREAM:
 976                ai->ai_protocol = IPPROTO_TCP;
 977                break;
 978        case SOCK_DGRAM:
 979                ai->ai_protocol = IPPROTO_UDP;
 980                break;
 981        default:
 982                ai->ai_protocol = 0;
 983                break;
 984        }
 985        ai->ai_addrlen = sizeof(struct sockaddr_in);
 986        ai->ai_canonname = strdup(h->h_name);
 987
 988        sin = xmalloc(ai->ai_addrlen);
 989        memset(sin, 0, ai->ai_addrlen);
 990        sin->sin_family = AF_INET;
 991        if (service)
 992                sin->sin_port = htons(atoi(service));
 993        sin->sin_addr = *(struct in_addr *)h->h_addr;
 994        ai->ai_addr = (struct sockaddr *)sin;
 995        ai->ai_next = 0;
 996        return 0;
 997}
 998
 999static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1000{
1001        free(res->ai_canonname);
1002        free(res->ai_addr);
1003        free(res);
1004}
1005
1006static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1007                                   char *host, DWORD hostlen,
1008                                   char *serv, DWORD servlen, int flags)
1009{
1010        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1011        if (sa->sa_family != AF_INET)
1012                return EAI_FAMILY;
1013        if (!host && !serv)
1014                return EAI_NONAME;
1015
1016        if (host && hostlen > 0) {
1017                struct hostent *ent = NULL;
1018                if (!(flags & NI_NUMERICHOST))
1019                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1020                                            sizeof(sin->sin_addr), AF_INET);
1021
1022                if (ent)
1023                        snprintf(host, hostlen, "%s", ent->h_name);
1024                else if (flags & NI_NAMEREQD)
1025                        return EAI_NONAME;
1026                else
1027                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1028        }
1029
1030        if (serv && servlen > 0) {
1031                struct servent *ent = NULL;
1032                if (!(flags & NI_NUMERICSERV))
1033                        ent = getservbyport(sin->sin_port,
1034                                            flags & NI_DGRAM ? "udp" : "tcp");
1035
1036                if (ent)
1037                        snprintf(serv, servlen, "%s", ent->s_name);
1038                else
1039                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1040        }
1041
1042        return 0;
1043}
1044
1045static HMODULE ipv6_dll = NULL;
1046static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1047static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1048                                      const struct addrinfo *hints,
1049                                      struct addrinfo **res);
1050static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1051                                      char *host, DWORD hostlen,
1052                                      char *serv, DWORD servlen, int flags);
1053/*
1054 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1055 * don't need to try to load that one dynamically.
1056 */
1057
1058static void socket_cleanup(void)
1059{
1060        WSACleanup();
1061        if (ipv6_dll)
1062                FreeLibrary(ipv6_dll);
1063        ipv6_dll = NULL;
1064        ipv6_freeaddrinfo = freeaddrinfo_stub;
1065        ipv6_getaddrinfo = getaddrinfo_stub;
1066        ipv6_getnameinfo = getnameinfo_stub;
1067}
1068
1069static void ensure_socket_initialization(void)
1070{
1071        WSADATA wsa;
1072        static int initialized = 0;
1073        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1074        const char **name;
1075
1076        if (initialized)
1077                return;
1078
1079        if (WSAStartup(MAKEWORD(2,2), &wsa))
1080                die("unable to initialize winsock subsystem, error %d",
1081                        WSAGetLastError());
1082
1083        for (name = libraries; *name; name++) {
1084                ipv6_dll = LoadLibrary(*name);
1085                if (!ipv6_dll)
1086                        continue;
1087
1088                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1089                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1090                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1091                                                   const struct addrinfo *,
1092                                                   struct addrinfo **))
1093                        GetProcAddress(ipv6_dll, "getaddrinfo");
1094                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1095                                                   socklen_t, char *, DWORD,
1096                                                   char *, DWORD, int))
1097                        GetProcAddress(ipv6_dll, "getnameinfo");
1098                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1099                        FreeLibrary(ipv6_dll);
1100                        ipv6_dll = NULL;
1101                } else
1102                        break;
1103        }
1104        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1105                ipv6_freeaddrinfo = freeaddrinfo_stub;
1106                ipv6_getaddrinfo = getaddrinfo_stub;
1107                ipv6_getnameinfo = getnameinfo_stub;
1108        }
1109
1110        atexit(socket_cleanup);
1111        initialized = 1;
1112}
1113
1114#undef gethostbyname
1115struct hostent *mingw_gethostbyname(const char *host)
1116{
1117        ensure_socket_initialization();
1118        return gethostbyname(host);
1119}
1120
1121void mingw_freeaddrinfo(struct addrinfo *res)
1122{
1123        ipv6_freeaddrinfo(res);
1124}
1125
1126int mingw_getaddrinfo(const char *node, const char *service,
1127                      const struct addrinfo *hints, struct addrinfo **res)
1128{
1129        ensure_socket_initialization();
1130        return ipv6_getaddrinfo(node, service, hints, res);
1131}
1132
1133int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1134                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1135                      int flags)
1136{
1137        ensure_socket_initialization();
1138        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1139}
1140
1141int mingw_socket(int domain, int type, int protocol)
1142{
1143        int sockfd;
1144        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1145        if (s == INVALID_SOCKET) {
1146                /*
1147                 * WSAGetLastError() values are regular BSD error codes
1148                 * biased by WSABASEERR.
1149                 * However, strerror() does not know about networking
1150                 * specific errors, which are values beginning at 38 or so.
1151                 * Therefore, we choose to leave the biased error code
1152                 * in errno so that _if_ someone looks up the code somewhere,
1153                 * then it is at least the number that are usually listed.
1154                 */
1155                errno = WSAGetLastError();
1156                return -1;
1157        }
1158        /* convert into a file descriptor */
1159        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1160                closesocket(s);
1161                return error("unable to make a socket file descriptor: %s",
1162                        strerror(errno));
1163        }
1164        return sockfd;
1165}
1166
1167#undef connect
1168int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1169{
1170        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1171        return connect(s, sa, sz);
1172}
1173
1174#undef rename
1175int mingw_rename(const char *pold, const char *pnew)
1176{
1177        DWORD attrs, gle;
1178        int tries = 0;
1179        static const int delay[] = { 0, 1, 10, 20, 40 };
1180
1181        /*
1182         * Try native rename() first to get errno right.
1183         * It is based on MoveFile(), which cannot overwrite existing files.
1184         */
1185        if (!rename(pold, pnew))
1186                return 0;
1187        if (errno != EEXIST)
1188                return -1;
1189repeat:
1190        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1191                return 0;
1192        /* TODO: translate more errors */
1193        gle = GetLastError();
1194        if (gle == ERROR_ACCESS_DENIED &&
1195            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1196                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1197                        errno = EISDIR;
1198                        return -1;
1199                }
1200                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1201                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1202                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1203                                return 0;
1204                        gle = GetLastError();
1205                        /* revert file attributes on failure */
1206                        SetFileAttributes(pnew, attrs);
1207                }
1208        }
1209        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1210                /*
1211                 * We assume that some other process had the source or
1212                 * destination file open at the wrong moment and retry.
1213                 * In order to give the other process a higher chance to
1214                 * complete its operation, we give up our time slice now.
1215                 * If we have to retry again, we do sleep a bit.
1216                 */
1217                Sleep(delay[tries]);
1218                tries++;
1219                goto repeat;
1220        }
1221        errno = EACCES;
1222        return -1;
1223}
1224
1225/*
1226 * Note that this doesn't return the actual pagesize, but
1227 * the allocation granularity. If future Windows specific git code
1228 * needs the real getpagesize function, we need to find another solution.
1229 */
1230int mingw_getpagesize(void)
1231{
1232        SYSTEM_INFO si;
1233        GetSystemInfo(&si);
1234        return si.dwAllocationGranularity;
1235}
1236
1237struct passwd *getpwuid(int uid)
1238{
1239        static char user_name[100];
1240        static struct passwd p;
1241
1242        DWORD len = sizeof(user_name);
1243        if (!GetUserName(user_name, &len))
1244                return NULL;
1245        p.pw_name = user_name;
1246        p.pw_gecos = "unknown";
1247        p.pw_dir = NULL;
1248        return &p;
1249}
1250
1251static HANDLE timer_event;
1252static HANDLE timer_thread;
1253static int timer_interval;
1254static int one_shot;
1255static sig_handler_t timer_fn = SIG_DFL;
1256
1257/* The timer works like this:
1258 * The thread, ticktack(), is a trivial routine that most of the time
1259 * only waits to receive the signal to terminate. The main thread tells
1260 * the thread to terminate by setting the timer_event to the signalled
1261 * state.
1262 * But ticktack() interrupts the wait state after the timer's interval
1263 * length to call the signal handler.
1264 */
1265
1266static unsigned __stdcall ticktack(void *dummy)
1267{
1268        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1269                if (timer_fn == SIG_DFL)
1270                        die("Alarm");
1271                if (timer_fn != SIG_IGN)
1272                        timer_fn(SIGALRM);
1273                if (one_shot)
1274                        break;
1275        }
1276        return 0;
1277}
1278
1279static int start_timer_thread(void)
1280{
1281        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1282        if (timer_event) {
1283                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1284                if (!timer_thread )
1285                        return errno = ENOMEM,
1286                                error("cannot start timer thread");
1287        } else
1288                return errno = ENOMEM,
1289                        error("cannot allocate resources for timer");
1290        return 0;
1291}
1292
1293static void stop_timer_thread(void)
1294{
1295        if (timer_event)
1296                SetEvent(timer_event);  /* tell thread to terminate */
1297        if (timer_thread) {
1298                int rc = WaitForSingleObject(timer_thread, 1000);
1299                if (rc == WAIT_TIMEOUT)
1300                        error("timer thread did not terminate timely");
1301                else if (rc != WAIT_OBJECT_0)
1302                        error("waiting for timer thread failed: %lu",
1303                              GetLastError());
1304                CloseHandle(timer_thread);
1305        }
1306        if (timer_event)
1307                CloseHandle(timer_event);
1308        timer_event = NULL;
1309        timer_thread = NULL;
1310}
1311
1312static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1313{
1314        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1315}
1316
1317int setitimer(int type, struct itimerval *in, struct itimerval *out)
1318{
1319        static const struct timeval zero;
1320        static int atexit_done;
1321
1322        if (out != NULL)
1323                return errno = EINVAL,
1324                        error("setitimer param 3 != NULL not implemented");
1325        if (!is_timeval_eq(&in->it_interval, &zero) &&
1326            !is_timeval_eq(&in->it_interval, &in->it_value))
1327                return errno = EINVAL,
1328                        error("setitimer: it_interval must be zero or eq it_value");
1329
1330        if (timer_thread)
1331                stop_timer_thread();
1332
1333        if (is_timeval_eq(&in->it_value, &zero) &&
1334            is_timeval_eq(&in->it_interval, &zero))
1335                return 0;
1336
1337        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1338        one_shot = is_timeval_eq(&in->it_interval, &zero);
1339        if (!atexit_done) {
1340                atexit(stop_timer_thread);
1341                atexit_done = 1;
1342        }
1343        return start_timer_thread();
1344}
1345
1346int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1347{
1348        if (sig != SIGALRM)
1349                return errno = EINVAL,
1350                        error("sigaction only implemented for SIGALRM");
1351        if (out != NULL)
1352                return errno = EINVAL,
1353                        error("sigaction: param 3 != NULL not implemented");
1354
1355        timer_fn = in->sa_handler;
1356        return 0;
1357}
1358
1359#undef signal
1360sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1361{
1362        sig_handler_t old = timer_fn;
1363        if (sig != SIGALRM)
1364                return signal(sig, handler);
1365        timer_fn = handler;
1366        return old;
1367}
1368
1369static const char *make_backslash_path(const char *path)
1370{
1371        static char buf[PATH_MAX + 1];
1372        char *c;
1373
1374        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1375                die("Too long path: %.*s", 60, path);
1376
1377        for (c = buf; *c; c++) {
1378                if (*c == '/')
1379                        *c = '\\';
1380        }
1381        return buf;
1382}
1383
1384void mingw_open_html(const char *unixpath)
1385{
1386        const char *htmlpath = make_backslash_path(unixpath);
1387        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1388                        const char *, const char *, const char *, INT);
1389        T ShellExecute;
1390        HMODULE shell32;
1391
1392        shell32 = LoadLibrary("shell32.dll");
1393        if (!shell32)
1394                die("cannot load shell32.dll");
1395        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1396        if (!ShellExecute)
1397                die("cannot run browser");
1398
1399        printf("Launching default browser to display HTML ...\n");
1400        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1401
1402        FreeLibrary(shell32);
1403}
1404
1405int link(const char *oldpath, const char *newpath)
1406{
1407        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1408        static T create_hard_link = NULL;
1409        if (!create_hard_link) {
1410                create_hard_link = (T) GetProcAddress(
1411                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1412                if (!create_hard_link)
1413                        create_hard_link = (T)-1;
1414        }
1415        if (create_hard_link == (T)-1) {
1416                errno = ENOSYS;
1417                return -1;
1418        }
1419        if (!create_hard_link(newpath, oldpath, NULL)) {
1420                errno = err_win_to_posix(GetLastError());
1421                return -1;
1422        }
1423        return 0;
1424}
1425
1426char *getpass(const char *prompt)
1427{
1428        struct strbuf buf = STRBUF_INIT;
1429
1430        fputs(prompt, stderr);
1431        for (;;) {
1432                char c = _getch();
1433                if (c == '\r' || c == '\n')
1434                        break;
1435                strbuf_addch(&buf, c);
1436        }
1437        fputs("\n", stderr);
1438        return strbuf_detach(&buf, NULL);
1439}
1440
1441#ifndef NO_MINGW_REPLACE_READDIR
1442/* MinGW readdir implementation to avoid extra lstats for Git */
1443struct mingw_DIR
1444{
1445        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1446        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1447        long                    dd_handle;      /* _findnext handle */
1448        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1449        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1450};
1451
1452struct dirent *mingw_readdir(DIR *dir)
1453{
1454        WIN32_FIND_DATAA buf;
1455        HANDLE handle;
1456        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1457
1458        if (!dir->dd_handle) {
1459                errno = EBADF; /* No set_errno for mingw */
1460                return NULL;
1461        }
1462
1463        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1464        {
1465                DWORD lasterr;
1466                handle = FindFirstFileA(dir->dd_name, &buf);
1467                lasterr = GetLastError();
1468                dir->dd_handle = (long)handle;
1469                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1470                        errno = err_win_to_posix(lasterr);
1471                        return NULL;
1472                }
1473        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1474                return NULL;
1475        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1476                DWORD lasterr = GetLastError();
1477                FindClose((HANDLE)dir->dd_handle);
1478                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1479                /* POSIX says you shouldn't set errno when readdir can't
1480                   find any more files; so, if another error we leave it set. */
1481                if (lasterr != ERROR_NO_MORE_FILES)
1482                        errno = err_win_to_posix(lasterr);
1483                return NULL;
1484        }
1485
1486        /* We get here if `buf' contains valid data.  */
1487        strcpy(dir->dd_dir.d_name, buf.cFileName);
1488        ++dir->dd_stat;
1489
1490        /* Set file type, based on WIN32_FIND_DATA */
1491        mdir->dd_dir.d_type = 0;
1492        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1493                mdir->dd_dir.d_type |= DT_DIR;
1494        else
1495                mdir->dd_dir.d_type |= DT_REG;
1496
1497        return (struct dirent*)&dir->dd_dir;
1498}
1499#endif // !NO_MINGW_REPLACE_READDIR