Andrew's git / gitweb.git / compat/mingw.c
?
compat / mingw.con commit Windows: boost startup by avoiding a static dependency on shell32.dll (928500e)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5
   6static int 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
 143static inline time_t filetime_to_time_t(const FILETIME *ft)
 144{
 145        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 146        winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
 147        winTime /= 10000000;             /* Nano to seconds resolution */
 148        return (time_t)winTime;
 149}
 150
 151/* We keep the do_lstat code in a separate function to avoid recursion.
 152 * When a path ends with a slash, the stat will fail with ENOENT. In
 153 * this case, we strip the trailing slashes and stat again.
 154 */
 155static int do_lstat(const char *file_name, struct stat *buf)
 156{
 157        WIN32_FILE_ATTRIBUTE_DATA fdata;
 158
 159        if (!(errno = get_file_attr(file_name, &fdata))) {
 160                buf->st_ino = 0;
 161                buf->st_gid = 0;
 162                buf->st_uid = 0;
 163                buf->st_nlink = 1;
 164                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 165                buf->st_size = fdata.nFileSizeLow |
 166                        (((off_t)fdata.nFileSizeHigh)<<32);
 167                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 168                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 169                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 170                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 171                return 0;
 172        }
 173        return -1;
 174}
 175
 176/* We provide our own lstat/fstat functions, since the provided
 177 * lstat/fstat functions are so slow. These stat functions are
 178 * tailored for Git's usage (read: fast), and are not meant to be
 179 * complete. Note that Git stat()s are redirected to mingw_lstat()
 180 * too, since Windows doesn't really handle symlinks that well.
 181 */
 182int mingw_lstat(const char *file_name, struct stat *buf)
 183{
 184        int namelen;
 185        static char alt_name[PATH_MAX];
 186
 187        if (!do_lstat(file_name, buf))
 188                return 0;
 189
 190        /* if file_name ended in a '/', Windows returned ENOENT;
 191         * try again without trailing slashes
 192         */
 193        if (errno != ENOENT)
 194                return -1;
 195
 196        namelen = strlen(file_name);
 197        if (namelen && file_name[namelen-1] != '/')
 198                return -1;
 199        while (namelen && file_name[namelen-1] == '/')
 200                --namelen;
 201        if (!namelen || namelen >= PATH_MAX)
 202                return -1;
 203
 204        memcpy(alt_name, file_name, namelen);
 205        alt_name[namelen] = 0;
 206        return do_lstat(alt_name, buf);
 207}
 208
 209#undef fstat
 210int mingw_fstat(int fd, struct stat *buf)
 211{
 212        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 213        BY_HANDLE_FILE_INFORMATION fdata;
 214
 215        if (fh == INVALID_HANDLE_VALUE) {
 216                errno = EBADF;
 217                return -1;
 218        }
 219        /* direct non-file handles to MS's fstat() */
 220        if (GetFileType(fh) != FILE_TYPE_DISK)
 221                return _fstati64(fd, buf);
 222
 223        if (GetFileInformationByHandle(fh, &fdata)) {
 224                buf->st_ino = 0;
 225                buf->st_gid = 0;
 226                buf->st_uid = 0;
 227                buf->st_nlink = 1;
 228                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 229                buf->st_size = fdata.nFileSizeLow |
 230                        (((off_t)fdata.nFileSizeHigh)<<32);
 231                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 232                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 233                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 234                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 235                return 0;
 236        }
 237        errno = EBADF;
 238        return -1;
 239}
 240
 241static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 242{
 243        long long winTime = t * 10000000LL + 116444736000000000LL;
 244        ft->dwLowDateTime = winTime;
 245        ft->dwHighDateTime = winTime >> 32;
 246}
 247
 248int mingw_utime (const char *file_name, const struct utimbuf *times)
 249{
 250        FILETIME mft, aft;
 251        int fh, rc;
 252
 253        /* must have write permission */
 254        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0)
 255                return -1;
 256
 257        time_t_to_filetime(times->modtime, &mft);
 258        time_t_to_filetime(times->actime, &aft);
 259        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 260                errno = EINVAL;
 261                rc = -1;
 262        } else
 263                rc = 0;
 264        close(fh);
 265        return rc;
 266}
 267
 268unsigned int sleep (unsigned int seconds)
 269{
 270        Sleep(seconds*1000);
 271        return 0;
 272}
 273
 274int mkstemp(char *template)
 275{
 276        char *filename = mktemp(template);
 277        if (filename == NULL)
 278                return -1;
 279        return open(filename, O_RDWR | O_CREAT, 0600);
 280}
 281
 282int gettimeofday(struct timeval *tv, void *tz)
 283{
 284        SYSTEMTIME st;
 285        struct tm tm;
 286        GetSystemTime(&st);
 287        tm.tm_year = st.wYear-1900;
 288        tm.tm_mon = st.wMonth-1;
 289        tm.tm_mday = st.wDay;
 290        tm.tm_hour = st.wHour;
 291        tm.tm_min = st.wMinute;
 292        tm.tm_sec = st.wSecond;
 293        tv->tv_sec = tm_to_time_t(&tm);
 294        if (tv->tv_sec < 0)
 295                return -1;
 296        tv->tv_usec = st.wMilliseconds*1000;
 297        return 0;
 298}
 299
 300int pipe(int filedes[2])
 301{
 302        int fd;
 303        HANDLE h[2], parent;
 304
 305        if (_pipe(filedes, 8192, 0) < 0)
 306                return -1;
 307
 308        parent = GetCurrentProcess();
 309
 310        if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[0]),
 311                        parent, &h[0], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 312                close(filedes[0]);
 313                close(filedes[1]);
 314                return -1;
 315        }
 316        if (!DuplicateHandle (parent, (HANDLE)_get_osfhandle(filedes[1]),
 317                        parent, &h[1], 0, FALSE, DUPLICATE_SAME_ACCESS)) {
 318                close(filedes[0]);
 319                close(filedes[1]);
 320                CloseHandle(h[0]);
 321                return -1;
 322        }
 323        fd = _open_osfhandle((int)h[0], O_NOINHERIT);
 324        if (fd < 0) {
 325                close(filedes[0]);
 326                close(filedes[1]);
 327                CloseHandle(h[0]);
 328                CloseHandle(h[1]);
 329                return -1;
 330        }
 331        close(filedes[0]);
 332        filedes[0] = fd;
 333        fd = _open_osfhandle((int)h[1], O_NOINHERIT);
 334        if (fd < 0) {
 335                close(filedes[0]);
 336                close(filedes[1]);
 337                CloseHandle(h[1]);
 338                return -1;
 339        }
 340        close(filedes[1]);
 341        filedes[1] = fd;
 342        return 0;
 343}
 344
 345int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 346{
 347        int i, pending;
 348
 349        if (timeout >= 0) {
 350                if (nfds == 0) {
 351                        Sleep(timeout);
 352                        return 0;
 353                }
 354                return errno = EINVAL, error("poll timeout not supported");
 355        }
 356
 357        /* When there is only one fd to wait for, then we pretend that
 358         * input is available and let the actual wait happen when the
 359         * caller invokes read().
 360         */
 361        if (nfds == 1) {
 362                if (!(ufds[0].events & POLLIN))
 363                        return errno = EINVAL, error("POLLIN not set");
 364                ufds[0].revents = POLLIN;
 365                return 0;
 366        }
 367
 368repeat:
 369        pending = 0;
 370        for (i = 0; i < nfds; i++) {
 371                DWORD avail = 0;
 372                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 373                if (h == INVALID_HANDLE_VALUE)
 374                        return -1;      /* errno was set */
 375
 376                if (!(ufds[i].events & POLLIN))
 377                        return errno = EINVAL, error("POLLIN not set");
 378
 379                /* this emulation works only for pipes */
 380                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 381                        int err = GetLastError();
 382                        if (err == ERROR_BROKEN_PIPE) {
 383                                ufds[i].revents = POLLHUP;
 384                                pending++;
 385                        } else {
 386                                errno = EINVAL;
 387                                return error("PeekNamedPipe failed,"
 388                                        " GetLastError: %u", err);
 389                        }
 390                } else if (avail) {
 391                        ufds[i].revents = POLLIN;
 392                        pending++;
 393                } else
 394                        ufds[i].revents = 0;
 395        }
 396        if (!pending) {
 397                /* The only times that we spin here is when the process
 398                 * that is connected through the pipes is waiting for
 399                 * its own input data to become available. But since
 400                 * the process (pack-objects) is itself CPU intensive,
 401                 * it will happily pick up the time slice that we are
 402                 * relinquishing here.
 403                 */
 404                Sleep(0);
 405                goto repeat;
 406        }
 407        return 0;
 408}
 409
 410struct tm *gmtime_r(const time_t *timep, struct tm *result)
 411{
 412        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 413        memcpy(result, gmtime(timep), sizeof(struct tm));
 414        return result;
 415}
 416
 417struct tm *localtime_r(const time_t *timep, struct tm *result)
 418{
 419        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 420        memcpy(result, localtime(timep), sizeof(struct tm));
 421        return result;
 422}
 423
 424#undef getcwd
 425char *mingw_getcwd(char *pointer, int len)
 426{
 427        int i;
 428        char *ret = getcwd(pointer, len);
 429        if (!ret)
 430                return ret;
 431        for (i = 0; pointer[i]; i++)
 432                if (pointer[i] == '\\')
 433                        pointer[i] = '/';
 434        return ret;
 435}
 436
 437#undef getenv
 438char *mingw_getenv(const char *name)
 439{
 440        char *result = getenv(name);
 441        if (!result && !strcmp(name, "TMPDIR")) {
 442                /* on Windows it is TMP and TEMP */
 443                result = getenv("TMP");
 444                if (!result)
 445                        result = getenv("TEMP");
 446        }
 447        return result;
 448}
 449
 450/*
 451 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 452 * (Parsing C++ Command-Line Arguments)
 453 */
 454static const char *quote_arg(const char *arg)
 455{
 456        /* count chars to quote */
 457        int len = 0, n = 0;
 458        int force_quotes = 0;
 459        char *q, *d;
 460        const char *p = arg;
 461        if (!*p) force_quotes = 1;
 462        while (*p) {
 463                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 464                        force_quotes = 1;
 465                else if (*p == '"')
 466                        n++;
 467                else if (*p == '\\') {
 468                        int count = 0;
 469                        while (*p == '\\') {
 470                                count++;
 471                                p++;
 472                                len++;
 473                        }
 474                        if (*p == '"')
 475                                n += count*2 + 1;
 476                        continue;
 477                }
 478                len++;
 479                p++;
 480        }
 481        if (!force_quotes && n == 0)
 482                return arg;
 483
 484        /* insert \ where necessary */
 485        d = q = xmalloc(len+n+3);
 486        *d++ = '"';
 487        while (*arg) {
 488                if (*arg == '"')
 489                        *d++ = '\\';
 490                else if (*arg == '\\') {
 491                        int count = 0;
 492                        while (*arg == '\\') {
 493                                count++;
 494                                *d++ = *arg++;
 495                        }
 496                        if (*arg == '"') {
 497                                while (count-- > 0)
 498                                        *d++ = '\\';
 499                                *d++ = '\\';
 500                        }
 501                }
 502                *d++ = *arg++;
 503        }
 504        *d++ = '"';
 505        *d++ = 0;
 506        return q;
 507}
 508
 509static const char *parse_interpreter(const char *cmd)
 510{
 511        static char buf[100];
 512        char *p, *opt;
 513        int n, fd;
 514
 515        /* don't even try a .exe */
 516        n = strlen(cmd);
 517        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 518                return NULL;
 519
 520        fd = open(cmd, O_RDONLY);
 521        if (fd < 0)
 522                return NULL;
 523        n = read(fd, buf, sizeof(buf)-1);
 524        close(fd);
 525        if (n < 4)      /* at least '#!/x' and not error */
 526                return NULL;
 527
 528        if (buf[0] != '#' || buf[1] != '!')
 529                return NULL;
 530        buf[n] = '\0';
 531        p = buf + strcspn(buf, "\r\n");
 532        if (!*p)
 533                return NULL;
 534
 535        *p = '\0';
 536        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 537                return NULL;
 538        /* strip options */
 539        if ((opt = strchr(p+1, ' ')))
 540                *opt = '\0';
 541        return p+1;
 542}
 543
 544/*
 545 * Splits the PATH into parts.
 546 */
 547static char **get_path_split(void)
 548{
 549        char *p, **path, *envpath = getenv("PATH");
 550        int i, n = 0;
 551
 552        if (!envpath || !*envpath)
 553                return NULL;
 554
 555        envpath = xstrdup(envpath);
 556        p = envpath;
 557        while (p) {
 558                char *dir = p;
 559                p = strchr(p, ';');
 560                if (p) *p++ = '\0';
 561                if (*dir) {     /* not earlier, catches series of ; */
 562                        ++n;
 563                }
 564        }
 565        if (!n)
 566                return NULL;
 567
 568        path = xmalloc((n+1)*sizeof(char *));
 569        p = envpath;
 570        i = 0;
 571        do {
 572                if (*p)
 573                        path[i++] = xstrdup(p);
 574                p = p+strlen(p)+1;
 575        } while (i < n);
 576        path[i] = NULL;
 577
 578        free(envpath);
 579
 580        return path;
 581}
 582
 583static void free_path_split(char **path)
 584{
 585        char **p = path;
 586
 587        if (!path)
 588                return;
 589
 590        while (*p)
 591                free(*p++);
 592        free(path);
 593}
 594
 595/*
 596 * exe_only means that we only want to detect .exe files, but not scripts
 597 * (which do not have an extension)
 598 */
 599static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 600{
 601        char path[MAX_PATH];
 602        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 603
 604        if (!isexe && access(path, F_OK) == 0)
 605                return xstrdup(path);
 606        path[strlen(path)-4] = '\0';
 607        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 608                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 609                        return xstrdup(path);
 610        return NULL;
 611}
 612
 613/*
 614 * Determines the absolute path of cmd using the the split path in path.
 615 * If cmd contains a slash or backslash, no lookup is performed.
 616 */
 617static char *path_lookup(const char *cmd, char **path, int exe_only)
 618{
 619        char *prog = NULL;
 620        int len = strlen(cmd);
 621        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 622
 623        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 624                prog = xstrdup(cmd);
 625
 626        while (!prog && *path)
 627                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 628
 629        return prog;
 630}
 631
 632static int env_compare(const void *a, const void *b)
 633{
 634        char *const *ea = a;
 635        char *const *eb = b;
 636        return strcasecmp(*ea, *eb);
 637}
 638
 639static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 640                           int prepend_cmd)
 641{
 642        STARTUPINFO si;
 643        PROCESS_INFORMATION pi;
 644        struct strbuf envblk, args;
 645        unsigned flags;
 646        BOOL ret;
 647
 648        /* Determine whether or not we are associated to a console */
 649        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 650                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 651                        FILE_ATTRIBUTE_NORMAL, NULL);
 652        if (cons == INVALID_HANDLE_VALUE) {
 653                /* There is no console associated with this process.
 654                 * Since the child is a console process, Windows
 655                 * would normally create a console window. But
 656                 * since we'll be redirecting std streams, we do
 657                 * not need the console.
 658                 * It is necessary to use DETACHED_PROCESS
 659                 * instead of CREATE_NO_WINDOW to make ssh
 660                 * recognize that it has no console.
 661                 */
 662                flags = DETACHED_PROCESS;
 663        } else {
 664                /* There is already a console. If we specified
 665                 * DETACHED_PROCESS here, too, Windows would
 666                 * disassociate the child from the console.
 667                 * The same is true for CREATE_NO_WINDOW.
 668                 * Go figure!
 669                 */
 670                flags = 0;
 671                CloseHandle(cons);
 672        }
 673        memset(&si, 0, sizeof(si));
 674        si.cb = sizeof(si);
 675        si.dwFlags = STARTF_USESTDHANDLES;
 676        si.hStdInput = (HANDLE) _get_osfhandle(0);
 677        si.hStdOutput = (HANDLE) _get_osfhandle(1);
 678        si.hStdError = (HANDLE) _get_osfhandle(2);
 679
 680        /* concatenate argv, quoting args as we go */
 681        strbuf_init(&args, 0);
 682        if (prepend_cmd) {
 683                char *quoted = (char *)quote_arg(cmd);
 684                strbuf_addstr(&args, quoted);
 685                if (quoted != cmd)
 686                        free(quoted);
 687        }
 688        for (; *argv; argv++) {
 689                char *quoted = (char *)quote_arg(*argv);
 690                if (*args.buf)
 691                        strbuf_addch(&args, ' ');
 692                strbuf_addstr(&args, quoted);
 693                if (quoted != *argv)
 694                        free(quoted);
 695        }
 696
 697        if (env) {
 698                int count = 0;
 699                char **e, **sorted_env;
 700
 701                for (e = env; *e; e++)
 702                        count++;
 703
 704                /* environment must be sorted */
 705                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 706                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 707                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 708
 709                strbuf_init(&envblk, 0);
 710                for (e = sorted_env; *e; e++) {
 711                        strbuf_addstr(&envblk, *e);
 712                        strbuf_addch(&envblk, '\0');
 713                }
 714                free(sorted_env);
 715        }
 716
 717        memset(&pi, 0, sizeof(pi));
 718        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 719                env ? envblk.buf : NULL, NULL, &si, &pi);
 720
 721        if (env)
 722                strbuf_release(&envblk);
 723        strbuf_release(&args);
 724
 725        if (!ret) {
 726                errno = ENOENT;
 727                return -1;
 728        }
 729        CloseHandle(pi.hThread);
 730        return (pid_t)pi.hProcess;
 731}
 732
 733pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env)
 734{
 735        pid_t pid;
 736        char **path = get_path_split();
 737        char *prog = path_lookup(cmd, path, 0);
 738
 739        if (!prog) {
 740                errno = ENOENT;
 741                pid = -1;
 742        }
 743        else {
 744                const char *interpr = parse_interpreter(prog);
 745
 746                if (interpr) {
 747                        const char *argv0 = argv[0];
 748                        char *iprog = path_lookup(interpr, path, 1);
 749                        argv[0] = prog;
 750                        if (!iprog) {
 751                                errno = ENOENT;
 752                                pid = -1;
 753                        }
 754                        else {
 755                                pid = mingw_spawnve(iprog, argv, env, 1);
 756                                free(iprog);
 757                        }
 758                        argv[0] = argv0;
 759                }
 760                else
 761                        pid = mingw_spawnve(prog, argv, env, 0);
 762                free(prog);
 763        }
 764        free_path_split(path);
 765        return pid;
 766}
 767
 768static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 769{
 770        const char *interpr = parse_interpreter(cmd);
 771        char **path;
 772        char *prog;
 773        int pid = 0;
 774
 775        if (!interpr)
 776                return 0;
 777        path = get_path_split();
 778        prog = path_lookup(interpr, path, 1);
 779        if (prog) {
 780                int argc = 0;
 781                const char **argv2;
 782                while (argv[argc]) argc++;
 783                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 784                argv2[0] = (char *)cmd; /* full path to the script file */
 785                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 786                pid = mingw_spawnve(prog, argv2, env, 1);
 787                if (pid >= 0) {
 788                        int status;
 789                        if (waitpid(pid, &status, 0) < 0)
 790                                status = 255;
 791                        exit(status);
 792                }
 793                pid = 1;        /* indicate that we tried but failed */
 794                free(prog);
 795                free(argv2);
 796        }
 797        free_path_split(path);
 798        return pid;
 799}
 800
 801static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 802{
 803        /* check if git_command is a shell script */
 804        if (!try_shell_exec(cmd, argv, (char **)env)) {
 805                int pid, status;
 806
 807                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 808                if (pid < 0)
 809                        return;
 810                if (waitpid(pid, &status, 0) < 0)
 811                        status = 255;
 812                exit(status);
 813        }
 814}
 815
 816void mingw_execvp(const char *cmd, char *const *argv)
 817{
 818        char **path = get_path_split();
 819        char *prog = path_lookup(cmd, path, 0);
 820
 821        if (prog) {
 822                mingw_execve(prog, argv, environ);
 823                free(prog);
 824        } else
 825                errno = ENOENT;
 826
 827        free_path_split(path);
 828}
 829
 830static char **copy_environ(void)
 831{
 832        char **env;
 833        int i = 0;
 834        while (environ[i])
 835                i++;
 836        env = xmalloc((i+1)*sizeof(*env));
 837        for (i = 0; environ[i]; i++)
 838                env[i] = xstrdup(environ[i]);
 839        env[i] = NULL;
 840        return env;
 841}
 842
 843void free_environ(char **env)
 844{
 845        int i;
 846        for (i = 0; env[i]; i++)
 847                free(env[i]);
 848        free(env);
 849}
 850
 851static int lookup_env(char **env, const char *name, size_t nmln)
 852{
 853        int i;
 854
 855        for (i = 0; env[i]; i++) {
 856                if (0 == strncmp(env[i], name, nmln)
 857                    && '=' == env[i][nmln])
 858                        /* matches */
 859                        return i;
 860        }
 861        return -1;
 862}
 863
 864/*
 865 * If name contains '=', then sets the variable, otherwise it unsets it
 866 */
 867static char **env_setenv(char **env, const char *name)
 868{
 869        char *eq = strchrnul(name, '=');
 870        int i = lookup_env(env, name, eq-name);
 871
 872        if (i < 0) {
 873                if (*eq) {
 874                        for (i = 0; env[i]; i++)
 875                                ;
 876                        env = xrealloc(env, (i+2)*sizeof(*env));
 877                        env[i] = xstrdup(name);
 878                        env[i+1] = NULL;
 879                }
 880        }
 881        else {
 882                free(env[i]);
 883                if (*eq)
 884                        env[i] = xstrdup(name);
 885                else
 886                        for (; env[i]; i++)
 887                                env[i] = env[i+1];
 888        }
 889        return env;
 890}
 891
 892/*
 893 * Copies global environ and adjusts variables as specified by vars.
 894 */
 895char **make_augmented_environ(const char *const *vars)
 896{
 897        char **env = copy_environ();
 898
 899        while (*vars)
 900                env = env_setenv(env, *vars++);
 901        return env;
 902}
 903
 904/*
 905 * Note, this isn't a complete replacement for getaddrinfo. It assumes
 906 * that service contains a numerical port, or that it it is null. It
 907 * does a simple search using gethostbyname, and returns one IPv4 host
 908 * if one was found.
 909 */
 910static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 911                                   const struct addrinfo *hints,
 912                                   struct addrinfo **res)
 913{
 914        struct hostent *h = gethostbyname(node);
 915        struct addrinfo *ai;
 916        struct sockaddr_in *sin;
 917
 918        if (!h)
 919                return WSAGetLastError();
 920
 921        ai = xmalloc(sizeof(struct addrinfo));
 922        *res = ai;
 923        ai->ai_flags = 0;
 924        ai->ai_family = AF_INET;
 925        ai->ai_socktype = hints->ai_socktype;
 926        switch (hints->ai_socktype) {
 927        case SOCK_STREAM:
 928                ai->ai_protocol = IPPROTO_TCP;
 929                break;
 930        case SOCK_DGRAM:
 931                ai->ai_protocol = IPPROTO_UDP;
 932                break;
 933        default:
 934                ai->ai_protocol = 0;
 935                break;
 936        }
 937        ai->ai_addrlen = sizeof(struct sockaddr_in);
 938        ai->ai_canonname = strdup(h->h_name);
 939
 940        sin = xmalloc(ai->ai_addrlen);
 941        memset(sin, 0, ai->ai_addrlen);
 942        sin->sin_family = AF_INET;
 943        if (service)
 944                sin->sin_port = htons(atoi(service));
 945        sin->sin_addr = *(struct in_addr *)h->h_addr;
 946        ai->ai_addr = (struct sockaddr *)sin;
 947        ai->ai_next = 0;
 948        return 0;
 949}
 950
 951static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 952{
 953        free(res->ai_canonname);
 954        free(res->ai_addr);
 955        free(res);
 956}
 957
 958static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
 959                                   char *host, DWORD hostlen,
 960                                   char *serv, DWORD servlen, int flags)
 961{
 962        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 963        if (sa->sa_family != AF_INET)
 964                return EAI_FAMILY;
 965        if (!host && !serv)
 966                return EAI_NONAME;
 967
 968        if (host && hostlen > 0) {
 969                struct hostent *ent = NULL;
 970                if (!(flags & NI_NUMERICHOST))
 971                        ent = gethostbyaddr((const char *)&sin->sin_addr,
 972                                            sizeof(sin->sin_addr), AF_INET);
 973
 974                if (ent)
 975                        snprintf(host, hostlen, "%s", ent->h_name);
 976                else if (flags & NI_NAMEREQD)
 977                        return EAI_NONAME;
 978                else
 979                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
 980        }
 981
 982        if (serv && servlen > 0) {
 983                struct servent *ent = NULL;
 984                if (!(flags & NI_NUMERICSERV))
 985                        ent = getservbyport(sin->sin_port,
 986                                            flags & NI_DGRAM ? "udp" : "tcp");
 987
 988                if (ent)
 989                        snprintf(serv, servlen, "%s", ent->s_name);
 990                else
 991                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
 992        }
 993
 994        return 0;
 995}
 996
 997static HMODULE ipv6_dll = NULL;
 998static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
 999static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1000                                      const struct addrinfo *hints,
1001                                      struct addrinfo **res);
1002static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1003                                      char *host, DWORD hostlen,
1004                                      char *serv, DWORD servlen, int flags);
1005/*
1006 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1007 * don't need to try to load that one dynamically.
1008 */
1009
1010static void socket_cleanup(void)
1011{
1012        WSACleanup();
1013        if (ipv6_dll)
1014                FreeLibrary(ipv6_dll);
1015        ipv6_dll = NULL;
1016        ipv6_freeaddrinfo = freeaddrinfo_stub;
1017        ipv6_getaddrinfo = getaddrinfo_stub;
1018        ipv6_getnameinfo = getnameinfo_stub;
1019}
1020
1021static void ensure_socket_initialization(void)
1022{
1023        WSADATA wsa;
1024        static int initialized = 0;
1025        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1026        const char **name;
1027
1028        if (initialized)
1029                return;
1030
1031        if (WSAStartup(MAKEWORD(2,2), &wsa))
1032                die("unable to initialize winsock subsystem, error %d",
1033                        WSAGetLastError());
1034
1035        for (name = libraries; *name; name++) {
1036                ipv6_dll = LoadLibrary(*name);
1037                if (!ipv6_dll)
1038                        continue;
1039
1040                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1041                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1042                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1043                                                   const struct addrinfo *,
1044                                                   struct addrinfo **))
1045                        GetProcAddress(ipv6_dll, "getaddrinfo");
1046                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1047                                                   socklen_t, char *, DWORD,
1048                                                   char *, DWORD, int))
1049                        GetProcAddress(ipv6_dll, "getnameinfo");
1050                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1051                        FreeLibrary(ipv6_dll);
1052                        ipv6_dll = NULL;
1053                } else
1054                        break;
1055        }
1056        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1057                ipv6_freeaddrinfo = freeaddrinfo_stub;
1058                ipv6_getaddrinfo = getaddrinfo_stub;
1059                ipv6_getnameinfo = getnameinfo_stub;
1060        }
1061
1062        atexit(socket_cleanup);
1063        initialized = 1;
1064}
1065
1066#undef gethostbyname
1067struct hostent *mingw_gethostbyname(const char *host)
1068{
1069        ensure_socket_initialization();
1070        return gethostbyname(host);
1071}
1072
1073void mingw_freeaddrinfo(struct addrinfo *res)
1074{
1075        ipv6_freeaddrinfo(res);
1076}
1077
1078int mingw_getaddrinfo(const char *node, const char *service,
1079                      const struct addrinfo *hints, struct addrinfo **res)
1080{
1081        ensure_socket_initialization();
1082        return ipv6_getaddrinfo(node, service, hints, res);
1083}
1084
1085int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1086                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1087                      int flags)
1088{
1089        ensure_socket_initialization();
1090        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1091}
1092
1093int mingw_socket(int domain, int type, int protocol)
1094{
1095        int sockfd;
1096        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1097        if (s == INVALID_SOCKET) {
1098                /*
1099                 * WSAGetLastError() values are regular BSD error codes
1100                 * biased by WSABASEERR.
1101                 * However, strerror() does not know about networking
1102                 * specific errors, which are values beginning at 38 or so.
1103                 * Therefore, we choose to leave the biased error code
1104                 * in errno so that _if_ someone looks up the code somewhere,
1105                 * then it is at least the number that are usually listed.
1106                 */
1107                errno = WSAGetLastError();
1108                return -1;
1109        }
1110        /* convert into a file descriptor */
1111        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1112                closesocket(s);
1113                return error("unable to make a socket file descriptor: %s",
1114                        strerror(errno));
1115        }
1116        return sockfd;
1117}
1118
1119#undef connect
1120int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1121{
1122        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1123        return connect(s, sa, sz);
1124}
1125
1126#undef rename
1127int mingw_rename(const char *pold, const char *pnew)
1128{
1129        DWORD attrs, gle;
1130        int tries = 0;
1131        static const int delay[] = { 0, 1, 10, 20, 40 };
1132
1133        /*
1134         * Try native rename() first to get errno right.
1135         * It is based on MoveFile(), which cannot overwrite existing files.
1136         */
1137        if (!rename(pold, pnew))
1138                return 0;
1139        if (errno != EEXIST)
1140                return -1;
1141repeat:
1142        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1143                return 0;
1144        /* TODO: translate more errors */
1145        gle = GetLastError();
1146        if (gle == ERROR_ACCESS_DENIED &&
1147            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1148                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1149                        errno = EISDIR;
1150                        return -1;
1151                }
1152                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1153                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1154                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1155                                return 0;
1156                        gle = GetLastError();
1157                        /* revert file attributes on failure */
1158                        SetFileAttributes(pnew, attrs);
1159                }
1160        }
1161        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1162                /*
1163                 * We assume that some other process had the source or
1164                 * destination file open at the wrong moment and retry.
1165                 * In order to give the other process a higher chance to
1166                 * complete its operation, we give up our time slice now.
1167                 * If we have to retry again, we do sleep a bit.
1168                 */
1169                Sleep(delay[tries]);
1170                tries++;
1171                goto repeat;
1172        }
1173        errno = EACCES;
1174        return -1;
1175}
1176
1177/*
1178 * Note that this doesn't return the actual pagesize, but
1179 * the allocation granularity. If future Windows specific git code
1180 * needs the real getpagesize function, we need to find another solution.
1181 */
1182int mingw_getpagesize(void)
1183{
1184        SYSTEM_INFO si;
1185        GetSystemInfo(&si);
1186        return si.dwAllocationGranularity;
1187}
1188
1189struct passwd *getpwuid(int uid)
1190{
1191        static char user_name[100];
1192        static struct passwd p;
1193
1194        DWORD len = sizeof(user_name);
1195        if (!GetUserName(user_name, &len))
1196                return NULL;
1197        p.pw_name = user_name;
1198        p.pw_gecos = "unknown";
1199        p.pw_dir = NULL;
1200        return &p;
1201}
1202
1203static HANDLE timer_event;
1204static HANDLE timer_thread;
1205static int timer_interval;
1206static int one_shot;
1207static sig_handler_t timer_fn = SIG_DFL;
1208
1209/* The timer works like this:
1210 * The thread, ticktack(), is a trivial routine that most of the time
1211 * only waits to receive the signal to terminate. The main thread tells
1212 * the thread to terminate by setting the timer_event to the signalled
1213 * state.
1214 * But ticktack() interrupts the wait state after the timer's interval
1215 * length to call the signal handler.
1216 */
1217
1218static unsigned __stdcall ticktack(void *dummy)
1219{
1220        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1221                if (timer_fn == SIG_DFL)
1222                        die("Alarm");
1223                if (timer_fn != SIG_IGN)
1224                        timer_fn(SIGALRM);
1225                if (one_shot)
1226                        break;
1227        }
1228        return 0;
1229}
1230
1231static int start_timer_thread(void)
1232{
1233        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1234        if (timer_event) {
1235                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1236                if (!timer_thread )
1237                        return errno = ENOMEM,
1238                                error("cannot start timer thread");
1239        } else
1240                return errno = ENOMEM,
1241                        error("cannot allocate resources for timer");
1242        return 0;
1243}
1244
1245static void stop_timer_thread(void)
1246{
1247        if (timer_event)
1248                SetEvent(timer_event);  /* tell thread to terminate */
1249        if (timer_thread) {
1250                int rc = WaitForSingleObject(timer_thread, 1000);
1251                if (rc == WAIT_TIMEOUT)
1252                        error("timer thread did not terminate timely");
1253                else if (rc != WAIT_OBJECT_0)
1254                        error("waiting for timer thread failed: %lu",
1255                              GetLastError());
1256                CloseHandle(timer_thread);
1257        }
1258        if (timer_event)
1259                CloseHandle(timer_event);
1260        timer_event = NULL;
1261        timer_thread = NULL;
1262}
1263
1264static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1265{
1266        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1267}
1268
1269int setitimer(int type, struct itimerval *in, struct itimerval *out)
1270{
1271        static const struct timeval zero;
1272        static int atexit_done;
1273
1274        if (out != NULL)
1275                return errno = EINVAL,
1276                        error("setitimer param 3 != NULL not implemented");
1277        if (!is_timeval_eq(&in->it_interval, &zero) &&
1278            !is_timeval_eq(&in->it_interval, &in->it_value))
1279                return errno = EINVAL,
1280                        error("setitimer: it_interval must be zero or eq it_value");
1281
1282        if (timer_thread)
1283                stop_timer_thread();
1284
1285        if (is_timeval_eq(&in->it_value, &zero) &&
1286            is_timeval_eq(&in->it_interval, &zero))
1287                return 0;
1288
1289        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1290        one_shot = is_timeval_eq(&in->it_interval, &zero);
1291        if (!atexit_done) {
1292                atexit(stop_timer_thread);
1293                atexit_done = 1;
1294        }
1295        return start_timer_thread();
1296}
1297
1298int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1299{
1300        if (sig != SIGALRM)
1301                return errno = EINVAL,
1302                        error("sigaction only implemented for SIGALRM");
1303        if (out != NULL)
1304                return errno = EINVAL,
1305                        error("sigaction: param 3 != NULL not implemented");
1306
1307        timer_fn = in->sa_handler;
1308        return 0;
1309}
1310
1311#undef signal
1312sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1313{
1314        sig_handler_t old = timer_fn;
1315        if (sig != SIGALRM)
1316                return signal(sig, handler);
1317        timer_fn = handler;
1318        return old;
1319}
1320
1321static const char *make_backslash_path(const char *path)
1322{
1323        static char buf[PATH_MAX + 1];
1324        char *c;
1325
1326        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1327                die("Too long path: %.*s", 60, path);
1328
1329        for (c = buf; *c; c++) {
1330                if (*c == '/')
1331                        *c = '\\';
1332        }
1333        return buf;
1334}
1335
1336void mingw_open_html(const char *unixpath)
1337{
1338        const char *htmlpath = make_backslash_path(unixpath);
1339        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1340                        const char *, const char *, const char *, INT);
1341        T ShellExecute;
1342        HMODULE shell32;
1343
1344        shell32 = LoadLibrary("shell32.dll");
1345        if (!shell32)
1346                die("cannot load shell32.dll");
1347        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1348        if (!ShellExecute)
1349                die("cannot run browser");
1350
1351        printf("Launching default browser to display HTML ...\n");
1352        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1353
1354        FreeLibrary(shell32);
1355}
1356
1357int link(const char *oldpath, const char *newpath)
1358{
1359        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1360        static T create_hard_link = NULL;
1361        if (!create_hard_link) {
1362                create_hard_link = (T) GetProcAddress(
1363                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1364                if (!create_hard_link)
1365                        create_hard_link = (T)-1;
1366        }
1367        if (create_hard_link == (T)-1) {
1368                errno = ENOSYS;
1369                return -1;
1370        }
1371        if (!create_hard_link(newpath, oldpath, NULL)) {
1372                errno = err_win_to_posix(GetLastError());
1373                return -1;
1374        }
1375        return 0;
1376}
1377
1378char *getpass(const char *prompt)
1379{
1380        struct strbuf buf = STRBUF_INIT;
1381
1382        fputs(prompt, stderr);
1383        for (;;) {
1384                char c = _getch();
1385                if (c == '\r' || c == '\n')
1386                        break;
1387                strbuf_addch(&buf, c);
1388        }
1389        fputs("\n", stderr);
1390        return strbuf_detach(&buf, NULL);
1391}
1392
1393#ifndef NO_MINGW_REPLACE_READDIR
1394/* MinGW readdir implementation to avoid extra lstats for Git */
1395struct mingw_DIR
1396{
1397        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1398        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1399        long                    dd_handle;      /* _findnext handle */
1400        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1401        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1402};
1403
1404struct dirent *mingw_readdir(DIR *dir)
1405{
1406        WIN32_FIND_DATAA buf;
1407        HANDLE handle;
1408        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1409
1410        if (!dir->dd_handle) {
1411                errno = EBADF; /* No set_errno for mingw */
1412                return NULL;
1413        }
1414
1415        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1416        {
1417                DWORD lasterr;
1418                handle = FindFirstFileA(dir->dd_name, &buf);
1419                lasterr = GetLastError();
1420                dir->dd_handle = (long)handle;
1421                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1422                        errno = err_win_to_posix(lasterr);
1423                        return NULL;
1424                }
1425        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1426                return NULL;
1427        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1428                DWORD lasterr = GetLastError();
1429                FindClose((HANDLE)dir->dd_handle);
1430                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1431                /* POSIX says you shouldn't set errno when readdir can't
1432                   find any more files; so, if another error we leave it set. */
1433                if (lasterr != ERROR_NO_MORE_FILES)
1434                        errno = err_win_to_posix(lasterr);
1435                return NULL;
1436        }
1437
1438        /* We get here if `buf' contains valid data.  */
1439        strcpy(dir->dd_dir.d_name, buf.cFileName);
1440        ++dir->dd_stat;
1441
1442        /* Set file type, based on WIN32_FIND_DATA */
1443        mdir->dd_dir.d_type = 0;
1444        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1445                mdir->dd_dir.d_type |= DT_DIR;
1446        else
1447                mdir->dd_dir.d_type |= DT_REG;
1448
1449        return (struct dirent*)&dir->dd_dir;
1450}
1451#endif // !NO_MINGW_REPLACE_READDIR