Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit Merge branch 'jc/conflict-marker-size' into maint (daaf2e8)
   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/*
 144 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 145 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 146 */
 147static inline long long filetime_to_hnsec(const FILETIME *ft)
 148{
 149        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 150        /* Windows to Unix Epoch conversion */
 151        return winTime - 116444736000000000LL;
 152}
 153
 154static inline time_t filetime_to_time_t(const FILETIME *ft)
 155{
 156        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 157}
 158
 159/* We keep the do_lstat code in a separate function to avoid recursion.
 160 * When a path ends with a slash, the stat will fail with ENOENT. In
 161 * this case, we strip the trailing slashes and stat again.
 162 */
 163static int do_lstat(const char *file_name, struct stat *buf)
 164{
 165        WIN32_FILE_ATTRIBUTE_DATA fdata;
 166
 167        if (!(errno = get_file_attr(file_name, &fdata))) {
 168                buf->st_ino = 0;
 169                buf->st_gid = 0;
 170                buf->st_uid = 0;
 171                buf->st_nlink = 1;
 172                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 173                buf->st_size = fdata.nFileSizeLow |
 174                        (((off_t)fdata.nFileSizeHigh)<<32);
 175                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 176                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 177                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 178                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 179                return 0;
 180        }
 181        return -1;
 182}
 183
 184/* We provide our own lstat/fstat functions, since the provided
 185 * lstat/fstat functions are so slow. These stat functions are
 186 * tailored for Git's usage (read: fast), and are not meant to be
 187 * complete. Note that Git stat()s are redirected to mingw_lstat()
 188 * too, since Windows doesn't really handle symlinks that well.
 189 */
 190int mingw_lstat(const char *file_name, struct stat *buf)
 191{
 192        int namelen;
 193        static char alt_name[PATH_MAX];
 194
 195        if (!do_lstat(file_name, buf))
 196                return 0;
 197
 198        /* if file_name ended in a '/', Windows returned ENOENT;
 199         * try again without trailing slashes
 200         */
 201        if (errno != ENOENT)
 202                return -1;
 203
 204        namelen = strlen(file_name);
 205        if (namelen && file_name[namelen-1] != '/')
 206                return -1;
 207        while (namelen && file_name[namelen-1] == '/')
 208                --namelen;
 209        if (!namelen || namelen >= PATH_MAX)
 210                return -1;
 211
 212        memcpy(alt_name, file_name, namelen);
 213        alt_name[namelen] = 0;
 214        return do_lstat(alt_name, buf);
 215}
 216
 217#undef fstat
 218int mingw_fstat(int fd, struct stat *buf)
 219{
 220        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 221        BY_HANDLE_FILE_INFORMATION fdata;
 222
 223        if (fh == INVALID_HANDLE_VALUE) {
 224                errno = EBADF;
 225                return -1;
 226        }
 227        /* direct non-file handles to MS's fstat() */
 228        if (GetFileType(fh) != FILE_TYPE_DISK)
 229                return _fstati64(fd, buf);
 230
 231        if (GetFileInformationByHandle(fh, &fdata)) {
 232                buf->st_ino = 0;
 233                buf->st_gid = 0;
 234                buf->st_uid = 0;
 235                buf->st_nlink = 1;
 236                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 237                buf->st_size = fdata.nFileSizeLow |
 238                        (((off_t)fdata.nFileSizeHigh)<<32);
 239                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 240                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 241                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 242                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 243                return 0;
 244        }
 245        errno = EBADF;
 246        return -1;
 247}
 248
 249static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 250{
 251        long long winTime = t * 10000000LL + 116444736000000000LL;
 252        ft->dwLowDateTime = winTime;
 253        ft->dwHighDateTime = winTime >> 32;
 254}
 255
 256int mingw_utime (const char *file_name, const struct utimbuf *times)
 257{
 258        FILETIME mft, aft;
 259        int fh, rc;
 260
 261        /* must have write permission */
 262        DWORD attrs = GetFileAttributes(file_name);
 263        if (attrs != INVALID_FILE_ATTRIBUTES &&
 264            (attrs & FILE_ATTRIBUTE_READONLY)) {
 265                /* ignore errors here; open() will report them */
 266                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 267        }
 268
 269        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 270                rc = -1;
 271                goto revert_attrs;
 272        }
 273
 274        time_t_to_filetime(times->modtime, &mft);
 275        time_t_to_filetime(times->actime, &aft);
 276        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 277                errno = EINVAL;
 278                rc = -1;
 279        } else
 280                rc = 0;
 281        close(fh);
 282
 283revert_attrs:
 284        if (attrs != INVALID_FILE_ATTRIBUTES &&
 285            (attrs & FILE_ATTRIBUTE_READONLY)) {
 286                /* ignore errors again */
 287                SetFileAttributes(file_name, attrs);
 288        }
 289        return rc;
 290}
 291
 292unsigned int sleep (unsigned int seconds)
 293{
 294        Sleep(seconds*1000);
 295        return 0;
 296}
 297
 298int mkstemp(char *template)
 299{
 300        char *filename = mktemp(template);
 301        if (filename == NULL)
 302                return -1;
 303        return open(filename, O_RDWR | O_CREAT, 0600);
 304}
 305
 306int gettimeofday(struct timeval *tv, void *tz)
 307{
 308        FILETIME ft;
 309        long long hnsec;
 310
 311        GetSystemTimeAsFileTime(&ft);
 312        hnsec = filetime_to_hnsec(&ft);
 313        tv->tv_sec = hnsec / 10000000;
 314        tv->tv_usec = (hnsec % 10000000) / 10;
 315        return 0;
 316}
 317
 318int pipe(int filedes[2])
 319{
 320        HANDLE h[2];
 321
 322        /* this creates non-inheritable handles */
 323        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 324                errno = err_win_to_posix(GetLastError());
 325                return -1;
 326        }
 327        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 328        if (filedes[0] < 0) {
 329                CloseHandle(h[0]);
 330                CloseHandle(h[1]);
 331                return -1;
 332        }
 333        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 334        if (filedes[0] < 0) {
 335                close(filedes[0]);
 336                CloseHandle(h[1]);
 337                return -1;
 338        }
 339        return 0;
 340}
 341
 342int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 343{
 344        int i, pending;
 345
 346        if (timeout >= 0) {
 347                if (nfds == 0) {
 348                        Sleep(timeout);
 349                        return 0;
 350                }
 351                return errno = EINVAL, error("poll timeout not supported");
 352        }
 353
 354        /* When there is only one fd to wait for, then we pretend that
 355         * input is available and let the actual wait happen when the
 356         * caller invokes read().
 357         */
 358        if (nfds == 1) {
 359                if (!(ufds[0].events & POLLIN))
 360                        return errno = EINVAL, error("POLLIN not set");
 361                ufds[0].revents = POLLIN;
 362                return 0;
 363        }
 364
 365repeat:
 366        pending = 0;
 367        for (i = 0; i < nfds; i++) {
 368                DWORD avail = 0;
 369                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 370                if (h == INVALID_HANDLE_VALUE)
 371                        return -1;      /* errno was set */
 372
 373                if (!(ufds[i].events & POLLIN))
 374                        return errno = EINVAL, error("POLLIN not set");
 375
 376                /* this emulation works only for pipes */
 377                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 378                        int err = GetLastError();
 379                        if (err == ERROR_BROKEN_PIPE) {
 380                                ufds[i].revents = POLLHUP;
 381                                pending++;
 382                        } else {
 383                                errno = EINVAL;
 384                                return error("PeekNamedPipe failed,"
 385                                        " GetLastError: %u", err);
 386                        }
 387                } else if (avail) {
 388                        ufds[i].revents = POLLIN;
 389                        pending++;
 390                } else
 391                        ufds[i].revents = 0;
 392        }
 393        if (!pending) {
 394                /* The only times that we spin here is when the process
 395                 * that is connected through the pipes is waiting for
 396                 * its own input data to become available. But since
 397                 * the process (pack-objects) is itself CPU intensive,
 398                 * it will happily pick up the time slice that we are
 399                 * relinquishing here.
 400                 */
 401                Sleep(0);
 402                goto repeat;
 403        }
 404        return 0;
 405}
 406
 407struct tm *gmtime_r(const time_t *timep, struct tm *result)
 408{
 409        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 410        memcpy(result, gmtime(timep), sizeof(struct tm));
 411        return result;
 412}
 413
 414struct tm *localtime_r(const time_t *timep, struct tm *result)
 415{
 416        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 417        memcpy(result, localtime(timep), sizeof(struct tm));
 418        return result;
 419}
 420
 421#undef getcwd
 422char *mingw_getcwd(char *pointer, int len)
 423{
 424        int i;
 425        char *ret = getcwd(pointer, len);
 426        if (!ret)
 427                return ret;
 428        for (i = 0; pointer[i]; i++)
 429                if (pointer[i] == '\\')
 430                        pointer[i] = '/';
 431        return ret;
 432}
 433
 434#undef getenv
 435char *mingw_getenv(const char *name)
 436{
 437        char *result = getenv(name);
 438        if (!result && !strcmp(name, "TMPDIR")) {
 439                /* on Windows it is TMP and TEMP */
 440                result = getenv("TMP");
 441                if (!result)
 442                        result = getenv("TEMP");
 443        }
 444        return result;
 445}
 446
 447/*
 448 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 449 * (Parsing C++ Command-Line Arguments)
 450 */
 451static const char *quote_arg(const char *arg)
 452{
 453        /* count chars to quote */
 454        int len = 0, n = 0;
 455        int force_quotes = 0;
 456        char *q, *d;
 457        const char *p = arg;
 458        if (!*p) force_quotes = 1;
 459        while (*p) {
 460                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 461                        force_quotes = 1;
 462                else if (*p == '"')
 463                        n++;
 464                else if (*p == '\\') {
 465                        int count = 0;
 466                        while (*p == '\\') {
 467                                count++;
 468                                p++;
 469                                len++;
 470                        }
 471                        if (*p == '"')
 472                                n += count*2 + 1;
 473                        continue;
 474                }
 475                len++;
 476                p++;
 477        }
 478        if (!force_quotes && n == 0)
 479                return arg;
 480
 481        /* insert \ where necessary */
 482        d = q = xmalloc(len+n+3);
 483        *d++ = '"';
 484        while (*arg) {
 485                if (*arg == '"')
 486                        *d++ = '\\';
 487                else if (*arg == '\\') {
 488                        int count = 0;
 489                        while (*arg == '\\') {
 490                                count++;
 491                                *d++ = *arg++;
 492                        }
 493                        if (*arg == '"') {
 494                                while (count-- > 0)
 495                                        *d++ = '\\';
 496                                *d++ = '\\';
 497                        }
 498                }
 499                *d++ = *arg++;
 500        }
 501        *d++ = '"';
 502        *d++ = 0;
 503        return q;
 504}
 505
 506static const char *parse_interpreter(const char *cmd)
 507{
 508        static char buf[100];
 509        char *p, *opt;
 510        int n, fd;
 511
 512        /* don't even try a .exe */
 513        n = strlen(cmd);
 514        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 515                return NULL;
 516
 517        fd = open(cmd, O_RDONLY);
 518        if (fd < 0)
 519                return NULL;
 520        n = read(fd, buf, sizeof(buf)-1);
 521        close(fd);
 522        if (n < 4)      /* at least '#!/x' and not error */
 523                return NULL;
 524
 525        if (buf[0] != '#' || buf[1] != '!')
 526                return NULL;
 527        buf[n] = '\0';
 528        p = buf + strcspn(buf, "\r\n");
 529        if (!*p)
 530                return NULL;
 531
 532        *p = '\0';
 533        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 534                return NULL;
 535        /* strip options */
 536        if ((opt = strchr(p+1, ' ')))
 537                *opt = '\0';
 538        return p+1;
 539}
 540
 541/*
 542 * Splits the PATH into parts.
 543 */
 544static char **get_path_split(void)
 545{
 546        char *p, **path, *envpath = getenv("PATH");
 547        int i, n = 0;
 548
 549        if (!envpath || !*envpath)
 550                return NULL;
 551
 552        envpath = xstrdup(envpath);
 553        p = envpath;
 554        while (p) {
 555                char *dir = p;
 556                p = strchr(p, ';');
 557                if (p) *p++ = '\0';
 558                if (*dir) {     /* not earlier, catches series of ; */
 559                        ++n;
 560                }
 561        }
 562        if (!n)
 563                return NULL;
 564
 565        path = xmalloc((n+1)*sizeof(char *));
 566        p = envpath;
 567        i = 0;
 568        do {
 569                if (*p)
 570                        path[i++] = xstrdup(p);
 571                p = p+strlen(p)+1;
 572        } while (i < n);
 573        path[i] = NULL;
 574
 575        free(envpath);
 576
 577        return path;
 578}
 579
 580static void free_path_split(char **path)
 581{
 582        char **p = path;
 583
 584        if (!path)
 585                return;
 586
 587        while (*p)
 588                free(*p++);
 589        free(path);
 590}
 591
 592/*
 593 * exe_only means that we only want to detect .exe files, but not scripts
 594 * (which do not have an extension)
 595 */
 596static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 597{
 598        char path[MAX_PATH];
 599        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 600
 601        if (!isexe && access(path, F_OK) == 0)
 602                return xstrdup(path);
 603        path[strlen(path)-4] = '\0';
 604        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 605                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 606                        return xstrdup(path);
 607        return NULL;
 608}
 609
 610/*
 611 * Determines the absolute path of cmd using the the split path in path.
 612 * If cmd contains a slash or backslash, no lookup is performed.
 613 */
 614static char *path_lookup(const char *cmd, char **path, int exe_only)
 615{
 616        char *prog = NULL;
 617        int len = strlen(cmd);
 618        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 619
 620        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 621                prog = xstrdup(cmd);
 622
 623        while (!prog && *path)
 624                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 625
 626        return prog;
 627}
 628
 629static int env_compare(const void *a, const void *b)
 630{
 631        char *const *ea = a;
 632        char *const *eb = b;
 633        return strcasecmp(*ea, *eb);
 634}
 635
 636static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 637                              int prepend_cmd, int fhin, int fhout, int fherr)
 638{
 639        STARTUPINFO si;
 640        PROCESS_INFORMATION pi;
 641        struct strbuf envblk, args;
 642        unsigned flags;
 643        BOOL ret;
 644
 645        /* Determine whether or not we are associated to a console */
 646        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 647                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 648                        FILE_ATTRIBUTE_NORMAL, NULL);
 649        if (cons == INVALID_HANDLE_VALUE) {
 650                /* There is no console associated with this process.
 651                 * Since the child is a console process, Windows
 652                 * would normally create a console window. But
 653                 * since we'll be redirecting std streams, we do
 654                 * not need the console.
 655                 * It is necessary to use DETACHED_PROCESS
 656                 * instead of CREATE_NO_WINDOW to make ssh
 657                 * recognize that it has no console.
 658                 */
 659                flags = DETACHED_PROCESS;
 660        } else {
 661                /* There is already a console. If we specified
 662                 * DETACHED_PROCESS here, too, Windows would
 663                 * disassociate the child from the console.
 664                 * The same is true for CREATE_NO_WINDOW.
 665                 * Go figure!
 666                 */
 667                flags = 0;
 668                CloseHandle(cons);
 669        }
 670        memset(&si, 0, sizeof(si));
 671        si.cb = sizeof(si);
 672        si.dwFlags = STARTF_USESTDHANDLES;
 673        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 674        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 675        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 676
 677        /* concatenate argv, quoting args as we go */
 678        strbuf_init(&args, 0);
 679        if (prepend_cmd) {
 680                char *quoted = (char *)quote_arg(cmd);
 681                strbuf_addstr(&args, quoted);
 682                if (quoted != cmd)
 683                        free(quoted);
 684        }
 685        for (; *argv; argv++) {
 686                char *quoted = (char *)quote_arg(*argv);
 687                if (*args.buf)
 688                        strbuf_addch(&args, ' ');
 689                strbuf_addstr(&args, quoted);
 690                if (quoted != *argv)
 691                        free(quoted);
 692        }
 693
 694        if (env) {
 695                int count = 0;
 696                char **e, **sorted_env;
 697
 698                for (e = env; *e; e++)
 699                        count++;
 700
 701                /* environment must be sorted */
 702                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 703                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 704                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 705
 706                strbuf_init(&envblk, 0);
 707                for (e = sorted_env; *e; e++) {
 708                        strbuf_addstr(&envblk, *e);
 709                        strbuf_addch(&envblk, '\0');
 710                }
 711                free(sorted_env);
 712        }
 713
 714        memset(&pi, 0, sizeof(pi));
 715        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 716                env ? envblk.buf : NULL, NULL, &si, &pi);
 717
 718        if (env)
 719                strbuf_release(&envblk);
 720        strbuf_release(&args);
 721
 722        if (!ret) {
 723                errno = ENOENT;
 724                return -1;
 725        }
 726        CloseHandle(pi.hThread);
 727        return (pid_t)pi.hProcess;
 728}
 729
 730static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 731                           int prepend_cmd)
 732{
 733        return mingw_spawnve_fd(cmd, argv, env, prepend_cmd, 0, 1, 2);
 734}
 735
 736pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 737                     int fhin, int fhout, int fherr)
 738{
 739        pid_t pid;
 740        char **path = get_path_split();
 741        char *prog = path_lookup(cmd, path, 0);
 742
 743        if (!prog) {
 744                errno = ENOENT;
 745                pid = -1;
 746        }
 747        else {
 748                const char *interpr = parse_interpreter(prog);
 749
 750                if (interpr) {
 751                        const char *argv0 = argv[0];
 752                        char *iprog = path_lookup(interpr, path, 1);
 753                        argv[0] = prog;
 754                        if (!iprog) {
 755                                errno = ENOENT;
 756                                pid = -1;
 757                        }
 758                        else {
 759                                pid = mingw_spawnve_fd(iprog, argv, env, 1,
 760                                                       fhin, fhout, fherr);
 761                                free(iprog);
 762                        }
 763                        argv[0] = argv0;
 764                }
 765                else
 766                        pid = mingw_spawnve_fd(prog, argv, env, 0,
 767                                               fhin, fhout, fherr);
 768                free(prog);
 769        }
 770        free_path_split(path);
 771        return pid;
 772}
 773
 774static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 775{
 776        const char *interpr = parse_interpreter(cmd);
 777        char **path;
 778        char *prog;
 779        int pid = 0;
 780
 781        if (!interpr)
 782                return 0;
 783        path = get_path_split();
 784        prog = path_lookup(interpr, path, 1);
 785        if (prog) {
 786                int argc = 0;
 787                const char **argv2;
 788                while (argv[argc]) argc++;
 789                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 790                argv2[0] = (char *)cmd; /* full path to the script file */
 791                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 792                pid = mingw_spawnve(prog, argv2, env, 1);
 793                if (pid >= 0) {
 794                        int status;
 795                        if (waitpid(pid, &status, 0) < 0)
 796                                status = 255;
 797                        exit(status);
 798                }
 799                pid = 1;        /* indicate that we tried but failed */
 800                free(prog);
 801                free(argv2);
 802        }
 803        free_path_split(path);
 804        return pid;
 805}
 806
 807static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 808{
 809        /* check if git_command is a shell script */
 810        if (!try_shell_exec(cmd, argv, (char **)env)) {
 811                int pid, status;
 812
 813                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 814                if (pid < 0)
 815                        return;
 816                if (waitpid(pid, &status, 0) < 0)
 817                        status = 255;
 818                exit(status);
 819        }
 820}
 821
 822void mingw_execvp(const char *cmd, char *const *argv)
 823{
 824        char **path = get_path_split();
 825        char *prog = path_lookup(cmd, path, 0);
 826
 827        if (prog) {
 828                mingw_execve(prog, argv, environ);
 829                free(prog);
 830        } else
 831                errno = ENOENT;
 832
 833        free_path_split(path);
 834}
 835
 836static char **copy_environ(void)
 837{
 838        char **env;
 839        int i = 0;
 840        while (environ[i])
 841                i++;
 842        env = xmalloc((i+1)*sizeof(*env));
 843        for (i = 0; environ[i]; i++)
 844                env[i] = xstrdup(environ[i]);
 845        env[i] = NULL;
 846        return env;
 847}
 848
 849void free_environ(char **env)
 850{
 851        int i;
 852        for (i = 0; env[i]; i++)
 853                free(env[i]);
 854        free(env);
 855}
 856
 857static int lookup_env(char **env, const char *name, size_t nmln)
 858{
 859        int i;
 860
 861        for (i = 0; env[i]; i++) {
 862                if (0 == strncmp(env[i], name, nmln)
 863                    && '=' == env[i][nmln])
 864                        /* matches */
 865                        return i;
 866        }
 867        return -1;
 868}
 869
 870/*
 871 * If name contains '=', then sets the variable, otherwise it unsets it
 872 */
 873static char **env_setenv(char **env, const char *name)
 874{
 875        char *eq = strchrnul(name, '=');
 876        int i = lookup_env(env, name, eq-name);
 877
 878        if (i < 0) {
 879                if (*eq) {
 880                        for (i = 0; env[i]; i++)
 881                                ;
 882                        env = xrealloc(env, (i+2)*sizeof(*env));
 883                        env[i] = xstrdup(name);
 884                        env[i+1] = NULL;
 885                }
 886        }
 887        else {
 888                free(env[i]);
 889                if (*eq)
 890                        env[i] = xstrdup(name);
 891                else
 892                        for (; env[i]; i++)
 893                                env[i] = env[i+1];
 894        }
 895        return env;
 896}
 897
 898/*
 899 * Copies global environ and adjusts variables as specified by vars.
 900 */
 901char **make_augmented_environ(const char *const *vars)
 902{
 903        char **env = copy_environ();
 904
 905        while (*vars)
 906                env = env_setenv(env, *vars++);
 907        return env;
 908}
 909
 910/*
 911 * Note, this isn't a complete replacement for getaddrinfo. It assumes
 912 * that service contains a numerical port, or that it it is null. It
 913 * does a simple search using gethostbyname, and returns one IPv4 host
 914 * if one was found.
 915 */
 916static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 917                                   const struct addrinfo *hints,
 918                                   struct addrinfo **res)
 919{
 920        struct hostent *h = gethostbyname(node);
 921        struct addrinfo *ai;
 922        struct sockaddr_in *sin;
 923
 924        if (!h)
 925                return WSAGetLastError();
 926
 927        ai = xmalloc(sizeof(struct addrinfo));
 928        *res = ai;
 929        ai->ai_flags = 0;
 930        ai->ai_family = AF_INET;
 931        ai->ai_socktype = hints->ai_socktype;
 932        switch (hints->ai_socktype) {
 933        case SOCK_STREAM:
 934                ai->ai_protocol = IPPROTO_TCP;
 935                break;
 936        case SOCK_DGRAM:
 937                ai->ai_protocol = IPPROTO_UDP;
 938                break;
 939        default:
 940                ai->ai_protocol = 0;
 941                break;
 942        }
 943        ai->ai_addrlen = sizeof(struct sockaddr_in);
 944        ai->ai_canonname = strdup(h->h_name);
 945
 946        sin = xmalloc(ai->ai_addrlen);
 947        memset(sin, 0, ai->ai_addrlen);
 948        sin->sin_family = AF_INET;
 949        if (service)
 950                sin->sin_port = htons(atoi(service));
 951        sin->sin_addr = *(struct in_addr *)h->h_addr;
 952        ai->ai_addr = (struct sockaddr *)sin;
 953        ai->ai_next = 0;
 954        return 0;
 955}
 956
 957static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 958{
 959        free(res->ai_canonname);
 960        free(res->ai_addr);
 961        free(res);
 962}
 963
 964static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
 965                                   char *host, DWORD hostlen,
 966                                   char *serv, DWORD servlen, int flags)
 967{
 968        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 969        if (sa->sa_family != AF_INET)
 970                return EAI_FAMILY;
 971        if (!host && !serv)
 972                return EAI_NONAME;
 973
 974        if (host && hostlen > 0) {
 975                struct hostent *ent = NULL;
 976                if (!(flags & NI_NUMERICHOST))
 977                        ent = gethostbyaddr((const char *)&sin->sin_addr,
 978                                            sizeof(sin->sin_addr), AF_INET);
 979
 980                if (ent)
 981                        snprintf(host, hostlen, "%s", ent->h_name);
 982                else if (flags & NI_NAMEREQD)
 983                        return EAI_NONAME;
 984                else
 985                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
 986        }
 987
 988        if (serv && servlen > 0) {
 989                struct servent *ent = NULL;
 990                if (!(flags & NI_NUMERICSERV))
 991                        ent = getservbyport(sin->sin_port,
 992                                            flags & NI_DGRAM ? "udp" : "tcp");
 993
 994                if (ent)
 995                        snprintf(serv, servlen, "%s", ent->s_name);
 996                else
 997                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
 998        }
 999
1000        return 0;
1001}
1002
1003static HMODULE ipv6_dll = NULL;
1004static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1005static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1006                                      const struct addrinfo *hints,
1007                                      struct addrinfo **res);
1008static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1009                                      char *host, DWORD hostlen,
1010                                      char *serv, DWORD servlen, int flags);
1011/*
1012 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1013 * don't need to try to load that one dynamically.
1014 */
1015
1016static void socket_cleanup(void)
1017{
1018        WSACleanup();
1019        if (ipv6_dll)
1020                FreeLibrary(ipv6_dll);
1021        ipv6_dll = NULL;
1022        ipv6_freeaddrinfo = freeaddrinfo_stub;
1023        ipv6_getaddrinfo = getaddrinfo_stub;
1024        ipv6_getnameinfo = getnameinfo_stub;
1025}
1026
1027static void ensure_socket_initialization(void)
1028{
1029        WSADATA wsa;
1030        static int initialized = 0;
1031        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1032        const char **name;
1033
1034        if (initialized)
1035                return;
1036
1037        if (WSAStartup(MAKEWORD(2,2), &wsa))
1038                die("unable to initialize winsock subsystem, error %d",
1039                        WSAGetLastError());
1040
1041        for (name = libraries; *name; name++) {
1042                ipv6_dll = LoadLibrary(*name);
1043                if (!ipv6_dll)
1044                        continue;
1045
1046                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1047                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1048                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1049                                                   const struct addrinfo *,
1050                                                   struct addrinfo **))
1051                        GetProcAddress(ipv6_dll, "getaddrinfo");
1052                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1053                                                   socklen_t, char *, DWORD,
1054                                                   char *, DWORD, int))
1055                        GetProcAddress(ipv6_dll, "getnameinfo");
1056                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1057                        FreeLibrary(ipv6_dll);
1058                        ipv6_dll = NULL;
1059                } else
1060                        break;
1061        }
1062        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1063                ipv6_freeaddrinfo = freeaddrinfo_stub;
1064                ipv6_getaddrinfo = getaddrinfo_stub;
1065                ipv6_getnameinfo = getnameinfo_stub;
1066        }
1067
1068        atexit(socket_cleanup);
1069        initialized = 1;
1070}
1071
1072#undef gethostbyname
1073struct hostent *mingw_gethostbyname(const char *host)
1074{
1075        ensure_socket_initialization();
1076        return gethostbyname(host);
1077}
1078
1079void mingw_freeaddrinfo(struct addrinfo *res)
1080{
1081        ipv6_freeaddrinfo(res);
1082}
1083
1084int mingw_getaddrinfo(const char *node, const char *service,
1085                      const struct addrinfo *hints, struct addrinfo **res)
1086{
1087        ensure_socket_initialization();
1088        return ipv6_getaddrinfo(node, service, hints, res);
1089}
1090
1091int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1092                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1093                      int flags)
1094{
1095        ensure_socket_initialization();
1096        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1097}
1098
1099int mingw_socket(int domain, int type, int protocol)
1100{
1101        int sockfd;
1102        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1103        if (s == INVALID_SOCKET) {
1104                /*
1105                 * WSAGetLastError() values are regular BSD error codes
1106                 * biased by WSABASEERR.
1107                 * However, strerror() does not know about networking
1108                 * specific errors, which are values beginning at 38 or so.
1109                 * Therefore, we choose to leave the biased error code
1110                 * in errno so that _if_ someone looks up the code somewhere,
1111                 * then it is at least the number that are usually listed.
1112                 */
1113                errno = WSAGetLastError();
1114                return -1;
1115        }
1116        /* convert into a file descriptor */
1117        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1118                closesocket(s);
1119                return error("unable to make a socket file descriptor: %s",
1120                        strerror(errno));
1121        }
1122        return sockfd;
1123}
1124
1125#undef connect
1126int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1127{
1128        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1129        return connect(s, sa, sz);
1130}
1131
1132#undef rename
1133int mingw_rename(const char *pold, const char *pnew)
1134{
1135        DWORD attrs, gle;
1136        int tries = 0;
1137        static const int delay[] = { 0, 1, 10, 20, 40 };
1138
1139        /*
1140         * Try native rename() first to get errno right.
1141         * It is based on MoveFile(), which cannot overwrite existing files.
1142         */
1143        if (!rename(pold, pnew))
1144                return 0;
1145        if (errno != EEXIST)
1146                return -1;
1147repeat:
1148        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1149                return 0;
1150        /* TODO: translate more errors */
1151        gle = GetLastError();
1152        if (gle == ERROR_ACCESS_DENIED &&
1153            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1154                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1155                        errno = EISDIR;
1156                        return -1;
1157                }
1158                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1159                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1160                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1161                                return 0;
1162                        gle = GetLastError();
1163                        /* revert file attributes on failure */
1164                        SetFileAttributes(pnew, attrs);
1165                }
1166        }
1167        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1168                /*
1169                 * We assume that some other process had the source or
1170                 * destination file open at the wrong moment and retry.
1171                 * In order to give the other process a higher chance to
1172                 * complete its operation, we give up our time slice now.
1173                 * If we have to retry again, we do sleep a bit.
1174                 */
1175                Sleep(delay[tries]);
1176                tries++;
1177                goto repeat;
1178        }
1179        errno = EACCES;
1180        return -1;
1181}
1182
1183/*
1184 * Note that this doesn't return the actual pagesize, but
1185 * the allocation granularity. If future Windows specific git code
1186 * needs the real getpagesize function, we need to find another solution.
1187 */
1188int mingw_getpagesize(void)
1189{
1190        SYSTEM_INFO si;
1191        GetSystemInfo(&si);
1192        return si.dwAllocationGranularity;
1193}
1194
1195struct passwd *getpwuid(int uid)
1196{
1197        static char user_name[100];
1198        static struct passwd p;
1199
1200        DWORD len = sizeof(user_name);
1201        if (!GetUserName(user_name, &len))
1202                return NULL;
1203        p.pw_name = user_name;
1204        p.pw_gecos = "unknown";
1205        p.pw_dir = NULL;
1206        return &p;
1207}
1208
1209static HANDLE timer_event;
1210static HANDLE timer_thread;
1211static int timer_interval;
1212static int one_shot;
1213static sig_handler_t timer_fn = SIG_DFL;
1214
1215/* The timer works like this:
1216 * The thread, ticktack(), is a trivial routine that most of the time
1217 * only waits to receive the signal to terminate. The main thread tells
1218 * the thread to terminate by setting the timer_event to the signalled
1219 * state.
1220 * But ticktack() interrupts the wait state after the timer's interval
1221 * length to call the signal handler.
1222 */
1223
1224static unsigned __stdcall ticktack(void *dummy)
1225{
1226        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1227                if (timer_fn == SIG_DFL)
1228                        die("Alarm");
1229                if (timer_fn != SIG_IGN)
1230                        timer_fn(SIGALRM);
1231                if (one_shot)
1232                        break;
1233        }
1234        return 0;
1235}
1236
1237static int start_timer_thread(void)
1238{
1239        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1240        if (timer_event) {
1241                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1242                if (!timer_thread )
1243                        return errno = ENOMEM,
1244                                error("cannot start timer thread");
1245        } else
1246                return errno = ENOMEM,
1247                        error("cannot allocate resources for timer");
1248        return 0;
1249}
1250
1251static void stop_timer_thread(void)
1252{
1253        if (timer_event)
1254                SetEvent(timer_event);  /* tell thread to terminate */
1255        if (timer_thread) {
1256                int rc = WaitForSingleObject(timer_thread, 1000);
1257                if (rc == WAIT_TIMEOUT)
1258                        error("timer thread did not terminate timely");
1259                else if (rc != WAIT_OBJECT_0)
1260                        error("waiting for timer thread failed: %lu",
1261                              GetLastError());
1262                CloseHandle(timer_thread);
1263        }
1264        if (timer_event)
1265                CloseHandle(timer_event);
1266        timer_event = NULL;
1267        timer_thread = NULL;
1268}
1269
1270static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1271{
1272        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1273}
1274
1275int setitimer(int type, struct itimerval *in, struct itimerval *out)
1276{
1277        static const struct timeval zero;
1278        static int atexit_done;
1279
1280        if (out != NULL)
1281                return errno = EINVAL,
1282                        error("setitimer param 3 != NULL not implemented");
1283        if (!is_timeval_eq(&in->it_interval, &zero) &&
1284            !is_timeval_eq(&in->it_interval, &in->it_value))
1285                return errno = EINVAL,
1286                        error("setitimer: it_interval must be zero or eq it_value");
1287
1288        if (timer_thread)
1289                stop_timer_thread();
1290
1291        if (is_timeval_eq(&in->it_value, &zero) &&
1292            is_timeval_eq(&in->it_interval, &zero))
1293                return 0;
1294
1295        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1296        one_shot = is_timeval_eq(&in->it_interval, &zero);
1297        if (!atexit_done) {
1298                atexit(stop_timer_thread);
1299                atexit_done = 1;
1300        }
1301        return start_timer_thread();
1302}
1303
1304int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1305{
1306        if (sig != SIGALRM)
1307                return errno = EINVAL,
1308                        error("sigaction only implemented for SIGALRM");
1309        if (out != NULL)
1310                return errno = EINVAL,
1311                        error("sigaction: param 3 != NULL not implemented");
1312
1313        timer_fn = in->sa_handler;
1314        return 0;
1315}
1316
1317#undef signal
1318sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1319{
1320        sig_handler_t old = timer_fn;
1321        if (sig != SIGALRM)
1322                return signal(sig, handler);
1323        timer_fn = handler;
1324        return old;
1325}
1326
1327static const char *make_backslash_path(const char *path)
1328{
1329        static char buf[PATH_MAX + 1];
1330        char *c;
1331
1332        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1333                die("Too long path: %.*s", 60, path);
1334
1335        for (c = buf; *c; c++) {
1336                if (*c == '/')
1337                        *c = '\\';
1338        }
1339        return buf;
1340}
1341
1342void mingw_open_html(const char *unixpath)
1343{
1344        const char *htmlpath = make_backslash_path(unixpath);
1345        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1346                        const char *, const char *, const char *, INT);
1347        T ShellExecute;
1348        HMODULE shell32;
1349
1350        shell32 = LoadLibrary("shell32.dll");
1351        if (!shell32)
1352                die("cannot load shell32.dll");
1353        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1354        if (!ShellExecute)
1355                die("cannot run browser");
1356
1357        printf("Launching default browser to display HTML ...\n");
1358        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1359
1360        FreeLibrary(shell32);
1361}
1362
1363int link(const char *oldpath, const char *newpath)
1364{
1365        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1366        static T create_hard_link = NULL;
1367        if (!create_hard_link) {
1368                create_hard_link = (T) GetProcAddress(
1369                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1370                if (!create_hard_link)
1371                        create_hard_link = (T)-1;
1372        }
1373        if (create_hard_link == (T)-1) {
1374                errno = ENOSYS;
1375                return -1;
1376        }
1377        if (!create_hard_link(newpath, oldpath, NULL)) {
1378                errno = err_win_to_posix(GetLastError());
1379                return -1;
1380        }
1381        return 0;
1382}
1383
1384char *getpass(const char *prompt)
1385{
1386        struct strbuf buf = STRBUF_INIT;
1387
1388        fputs(prompt, stderr);
1389        for (;;) {
1390                char c = _getch();
1391                if (c == '\r' || c == '\n')
1392                        break;
1393                strbuf_addch(&buf, c);
1394        }
1395        fputs("\n", stderr);
1396        return strbuf_detach(&buf, NULL);
1397}
1398
1399#ifndef NO_MINGW_REPLACE_READDIR
1400/* MinGW readdir implementation to avoid extra lstats for Git */
1401struct mingw_DIR
1402{
1403        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1404        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1405        long                    dd_handle;      /* _findnext handle */
1406        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1407        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1408};
1409
1410struct dirent *mingw_readdir(DIR *dir)
1411{
1412        WIN32_FIND_DATAA buf;
1413        HANDLE handle;
1414        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1415
1416        if (!dir->dd_handle) {
1417                errno = EBADF; /* No set_errno for mingw */
1418                return NULL;
1419        }
1420
1421        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1422        {
1423                DWORD lasterr;
1424                handle = FindFirstFileA(dir->dd_name, &buf);
1425                lasterr = GetLastError();
1426                dir->dd_handle = (long)handle;
1427                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1428                        errno = err_win_to_posix(lasterr);
1429                        return NULL;
1430                }
1431        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1432                return NULL;
1433        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1434                DWORD lasterr = GetLastError();
1435                FindClose((HANDLE)dir->dd_handle);
1436                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1437                /* POSIX says you shouldn't set errno when readdir can't
1438                   find any more files; so, if another error we leave it set. */
1439                if (lasterr != ERROR_NO_MORE_FILES)
1440                        errno = err_win_to_posix(lasterr);
1441                return NULL;
1442        }
1443
1444        /* We get here if `buf' contains valid data.  */
1445        strcpy(dir->dd_dir.d_name, buf.cFileName);
1446        ++dir->dd_stat;
1447
1448        /* Set file type, based on WIN32_FIND_DATA */
1449        mdir->dd_dir.d_type = 0;
1450        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1451                mdir->dd_dir.d_type |= DT_DIR;
1452        else
1453                mdir->dd_dir.d_type |= DT_REG;
1454
1455        return (struct dirent*)&dir->dd_dir;
1456}
1457#endif // !NO_MINGW_REPLACE_READDIR