Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit rerere: fix overeager gc (7d7ff15)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5
   6int err_win_to_posix(DWORD winerr)
   7{
   8        int error = ENOSYS;
   9        switch(winerr) {
  10        case ERROR_ACCESS_DENIED: error = EACCES; break;
  11        case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  12        case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  13        case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  14        case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  15        case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  16        case ERROR_BAD_COMMAND: error = EIO; break;
  17        case ERROR_BAD_DEVICE: error = ENODEV; break;
  18        case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  19        case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  20        case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  21        case ERROR_BAD_LENGTH: error = EINVAL; break;
  22        case ERROR_BAD_PATHNAME: error = ENOENT; break;
  23        case ERROR_BAD_PIPE: error = EPIPE; break;
  24        case ERROR_BAD_UNIT: error = ENODEV; break;
  25        case ERROR_BAD_USERNAME: error = EINVAL; break;
  26        case ERROR_BROKEN_PIPE: error = EPIPE; break;
  27        case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  28        case ERROR_BUSY: error = EBUSY; break;
  29        case ERROR_BUSY_DRIVE: error = EBUSY; break;
  30        case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  31        case ERROR_CANNOT_MAKE: error = EACCES; break;
  32        case ERROR_CANTOPEN: error = EIO; break;
  33        case ERROR_CANTREAD: error = EIO; break;
  34        case ERROR_CANTWRITE: error = EIO; break;
  35        case ERROR_CRC: error = EIO; break;
  36        case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  37        case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  38        case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  39        case ERROR_DIRECTORY: error = EINVAL; break;
  40        case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  41        case ERROR_DISK_CHANGE: error = EIO; break;
  42        case ERROR_DISK_FULL: error = ENOSPC; break;
  43        case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  44        case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  45        case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  46        case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  47        case ERROR_FILE_EXISTS: error = EEXIST; break;
  48        case ERROR_FILE_INVALID: error = ENODEV; break;
  49        case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  50        case ERROR_GEN_FAILURE: error = EIO; break;
  51        case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  52        case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  53        case ERROR_INVALID_ACCESS: error = EACCES; break;
  54        case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  55        case ERROR_INVALID_BLOCK: error = EFAULT; break;
  56        case ERROR_INVALID_DATA: error = EINVAL; break;
  57        case ERROR_INVALID_DRIVE: error = ENODEV; break;
  58        case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  59        case ERROR_INVALID_FLAGS: error = EINVAL; break;
  60        case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  61        case ERROR_INVALID_HANDLE: error = EBADF; break;
  62        case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  63        case ERROR_INVALID_NAME: error = EINVAL; break;
  64        case ERROR_INVALID_OWNER: error = EINVAL; break;
  65        case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  66        case ERROR_INVALID_PASSWORD: error = EPERM; break;
  67        case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  68        case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  69        case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  70        case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  71        case ERROR_IO_DEVICE: error = EIO; break;
  72        case ERROR_IO_INCOMPLETE: error = EINTR; break;
  73        case ERROR_LOCKED: error = EBUSY; break;
  74        case ERROR_LOCK_VIOLATION: error = EACCES; break;
  75        case ERROR_LOGON_FAILURE: error = EACCES; break;
  76        case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  77        case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  78        case ERROR_MORE_DATA: error = EPIPE; break;
  79        case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  80        case ERROR_NOACCESS: error = EFAULT; break;
  81        case ERROR_NONE_MAPPED: error = EINVAL; break;
  82        case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  83        case ERROR_NOT_READY: error = EAGAIN; break;
  84        case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  85        case ERROR_NO_DATA: error = EPIPE; break;
  86        case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  87        case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  88        case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  89        case ERROR_OPEN_FAILED: error = EIO; break;
  90        case ERROR_OPEN_FILES: error = EBUSY; break;
  91        case ERROR_OPERATION_ABORTED: error = EINTR; break;
  92        case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  93        case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  94        case ERROR_PATH_BUSY: error = EBUSY; break;
  95        case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  96        case ERROR_PIPE_BUSY: error = EBUSY; break;
  97        case ERROR_PIPE_CONNECTED: error = EPIPE; break;
  98        case ERROR_PIPE_LISTENING: error = EPIPE; break;
  99        case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 100        case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 101        case ERROR_READ_FAULT: error = EIO; break;
 102        case ERROR_SEEK: error = EIO; break;
 103        case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 104        case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 105        case ERROR_SHARING_VIOLATION: error = EACCES; break;
 106        case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 107        case ERROR_SWAPERROR: error = ENOENT; break;
 108        case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 109        case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 110        case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 111        case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 112        case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 113        case ERROR_WRITE_FAULT: error = EIO; break;
 114        case ERROR_WRITE_PROTECT: error = EROFS; break;
 115        }
 116        return error;
 117}
 118
 119#undef open
 120int mingw_open (const char *filename, int oflags, ...)
 121{
 122        va_list args;
 123        unsigned mode;
 124        int fd;
 125
 126        va_start(args, oflags);
 127        mode = va_arg(args, int);
 128        va_end(args);
 129
 130        if (!strcmp(filename, "/dev/null"))
 131                filename = "nul";
 132
 133        fd = open(filename, oflags, mode);
 134
 135        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 136                DWORD attrs = GetFileAttributes(filename);
 137                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 138                        errno = EISDIR;
 139        }
 140        return fd;
 141}
 142
 143#undef write
 144ssize_t mingw_write(int fd, const void *buf, size_t count)
 145{
 146        /*
 147         * While write() calls to a file on a local disk are translated
 148         * into WriteFile() calls with a maximum size of 64KB on Windows
 149         * XP and 256KB on Vista, no such cap is placed on writes to
 150         * files over the network on Windows XP.  Unfortunately, there
 151         * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 152         * bigger writes fail on Windows XP.
 153         * So we cap to a nice 31MB here to avoid write failures over
 154         * the net without changing the number of WriteFile() calls in
 155         * the local case.
 156         */
 157        return write(fd, buf, min(count, 31 * 1024 * 1024));
 158}
 159
 160#undef fopen
 161FILE *mingw_fopen (const char *filename, const char *otype)
 162{
 163        if (!strcmp(filename, "/dev/null"))
 164                filename = "nul";
 165        return fopen(filename, otype);
 166}
 167
 168#undef freopen
 169FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 170{
 171        if (filename && !strcmp(filename, "/dev/null"))
 172                filename = "nul";
 173        return freopen(filename, otype, stream);
 174}
 175
 176/*
 177 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 178 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 179 */
 180static inline long long filetime_to_hnsec(const FILETIME *ft)
 181{
 182        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 183        /* Windows to Unix Epoch conversion */
 184        return winTime - 116444736000000000LL;
 185}
 186
 187static inline time_t filetime_to_time_t(const FILETIME *ft)
 188{
 189        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 190}
 191
 192/* We keep the do_lstat code in a separate function to avoid recursion.
 193 * When a path ends with a slash, the stat will fail with ENOENT. In
 194 * this case, we strip the trailing slashes and stat again.
 195 */
 196static int do_lstat(const char *file_name, struct stat *buf)
 197{
 198        WIN32_FILE_ATTRIBUTE_DATA fdata;
 199
 200        if (!(errno = get_file_attr(file_name, &fdata))) {
 201                buf->st_ino = 0;
 202                buf->st_gid = 0;
 203                buf->st_uid = 0;
 204                buf->st_nlink = 1;
 205                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 206                buf->st_size = fdata.nFileSizeLow |
 207                        (((off_t)fdata.nFileSizeHigh)<<32);
 208                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 209                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 210                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 211                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 212                return 0;
 213        }
 214        return -1;
 215}
 216
 217/* We provide our own lstat/fstat functions, since the provided
 218 * lstat/fstat functions are so slow. These stat functions are
 219 * tailored for Git's usage (read: fast), and are not meant to be
 220 * complete. Note that Git stat()s are redirected to mingw_lstat()
 221 * too, since Windows doesn't really handle symlinks that well.
 222 */
 223int mingw_lstat(const char *file_name, struct stat *buf)
 224{
 225        int namelen;
 226        static char alt_name[PATH_MAX];
 227
 228        if (!do_lstat(file_name, buf))
 229                return 0;
 230
 231        /* if file_name ended in a '/', Windows returned ENOENT;
 232         * try again without trailing slashes
 233         */
 234        if (errno != ENOENT)
 235                return -1;
 236
 237        namelen = strlen(file_name);
 238        if (namelen && file_name[namelen-1] != '/')
 239                return -1;
 240        while (namelen && file_name[namelen-1] == '/')
 241                --namelen;
 242        if (!namelen || namelen >= PATH_MAX)
 243                return -1;
 244
 245        memcpy(alt_name, file_name, namelen);
 246        alt_name[namelen] = 0;
 247        return do_lstat(alt_name, buf);
 248}
 249
 250#undef fstat
 251int mingw_fstat(int fd, struct stat *buf)
 252{
 253        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 254        BY_HANDLE_FILE_INFORMATION fdata;
 255
 256        if (fh == INVALID_HANDLE_VALUE) {
 257                errno = EBADF;
 258                return -1;
 259        }
 260        /* direct non-file handles to MS's fstat() */
 261        if (GetFileType(fh) != FILE_TYPE_DISK)
 262                return _fstati64(fd, buf);
 263
 264        if (GetFileInformationByHandle(fh, &fdata)) {
 265                buf->st_ino = 0;
 266                buf->st_gid = 0;
 267                buf->st_uid = 0;
 268                buf->st_nlink = 1;
 269                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 270                buf->st_size = fdata.nFileSizeLow |
 271                        (((off_t)fdata.nFileSizeHigh)<<32);
 272                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 273                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 274                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 275                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 276                return 0;
 277        }
 278        errno = EBADF;
 279        return -1;
 280}
 281
 282static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 283{
 284        long long winTime = t * 10000000LL + 116444736000000000LL;
 285        ft->dwLowDateTime = winTime;
 286        ft->dwHighDateTime = winTime >> 32;
 287}
 288
 289int mingw_utime (const char *file_name, const struct utimbuf *times)
 290{
 291        FILETIME mft, aft;
 292        int fh, rc;
 293
 294        /* must have write permission */
 295        DWORD attrs = GetFileAttributes(file_name);
 296        if (attrs != INVALID_FILE_ATTRIBUTES &&
 297            (attrs & FILE_ATTRIBUTE_READONLY)) {
 298                /* ignore errors here; open() will report them */
 299                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 300        }
 301
 302        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 303                rc = -1;
 304                goto revert_attrs;
 305        }
 306
 307        if (times) {
 308                time_t_to_filetime(times->modtime, &mft);
 309                time_t_to_filetime(times->actime, &aft);
 310        } else {
 311                GetSystemTimeAsFileTime(&mft);
 312                aft = mft;
 313        }
 314        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 315                errno = EINVAL;
 316                rc = -1;
 317        } else
 318                rc = 0;
 319        close(fh);
 320
 321revert_attrs:
 322        if (attrs != INVALID_FILE_ATTRIBUTES &&
 323            (attrs & FILE_ATTRIBUTE_READONLY)) {
 324                /* ignore errors again */
 325                SetFileAttributes(file_name, attrs);
 326        }
 327        return rc;
 328}
 329
 330unsigned int sleep (unsigned int seconds)
 331{
 332        Sleep(seconds*1000);
 333        return 0;
 334}
 335
 336int mkstemp(char *template)
 337{
 338        char *filename = mktemp(template);
 339        if (filename == NULL)
 340                return -1;
 341        return open(filename, O_RDWR | O_CREAT, 0600);
 342}
 343
 344int gettimeofday(struct timeval *tv, void *tz)
 345{
 346        FILETIME ft;
 347        long long hnsec;
 348
 349        GetSystemTimeAsFileTime(&ft);
 350        hnsec = filetime_to_hnsec(&ft);
 351        tv->tv_sec = hnsec / 10000000;
 352        tv->tv_usec = (hnsec % 10000000) / 10;
 353        return 0;
 354}
 355
 356int pipe(int filedes[2])
 357{
 358        HANDLE h[2];
 359
 360        /* this creates non-inheritable handles */
 361        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 362                errno = err_win_to_posix(GetLastError());
 363                return -1;
 364        }
 365        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 366        if (filedes[0] < 0) {
 367                CloseHandle(h[0]);
 368                CloseHandle(h[1]);
 369                return -1;
 370        }
 371        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 372        if (filedes[0] < 0) {
 373                close(filedes[0]);
 374                CloseHandle(h[1]);
 375                return -1;
 376        }
 377        return 0;
 378}
 379
 380int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 381{
 382        int i, pending;
 383
 384        if (timeout >= 0) {
 385                if (nfds == 0) {
 386                        Sleep(timeout);
 387                        return 0;
 388                }
 389                return errno = EINVAL, error("poll timeout not supported");
 390        }
 391
 392        /* When there is only one fd to wait for, then we pretend that
 393         * input is available and let the actual wait happen when the
 394         * caller invokes read().
 395         */
 396        if (nfds == 1) {
 397                if (!(ufds[0].events & POLLIN))
 398                        return errno = EINVAL, error("POLLIN not set");
 399                ufds[0].revents = POLLIN;
 400                return 0;
 401        }
 402
 403repeat:
 404        pending = 0;
 405        for (i = 0; i < nfds; i++) {
 406                DWORD avail = 0;
 407                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 408                if (h == INVALID_HANDLE_VALUE)
 409                        return -1;      /* errno was set */
 410
 411                if (!(ufds[i].events & POLLIN))
 412                        return errno = EINVAL, error("POLLIN not set");
 413
 414                /* this emulation works only for pipes */
 415                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 416                        int err = GetLastError();
 417                        if (err == ERROR_BROKEN_PIPE) {
 418                                ufds[i].revents = POLLHUP;
 419                                pending++;
 420                        } else {
 421                                errno = EINVAL;
 422                                return error("PeekNamedPipe failed,"
 423                                        " GetLastError: %u", err);
 424                        }
 425                } else if (avail) {
 426                        ufds[i].revents = POLLIN;
 427                        pending++;
 428                } else
 429                        ufds[i].revents = 0;
 430        }
 431        if (!pending) {
 432                /* The only times that we spin here is when the process
 433                 * that is connected through the pipes is waiting for
 434                 * its own input data to become available. But since
 435                 * the process (pack-objects) is itself CPU intensive,
 436                 * it will happily pick up the time slice that we are
 437                 * relinquishing here.
 438                 */
 439                Sleep(0);
 440                goto repeat;
 441        }
 442        return 0;
 443}
 444
 445struct tm *gmtime_r(const time_t *timep, struct tm *result)
 446{
 447        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 448        memcpy(result, gmtime(timep), sizeof(struct tm));
 449        return result;
 450}
 451
 452struct tm *localtime_r(const time_t *timep, struct tm *result)
 453{
 454        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 455        memcpy(result, localtime(timep), sizeof(struct tm));
 456        return result;
 457}
 458
 459#undef getcwd
 460char *mingw_getcwd(char *pointer, int len)
 461{
 462        int i;
 463        char *ret = getcwd(pointer, len);
 464        if (!ret)
 465                return ret;
 466        for (i = 0; pointer[i]; i++)
 467                if (pointer[i] == '\\')
 468                        pointer[i] = '/';
 469        return ret;
 470}
 471
 472#undef getenv
 473char *mingw_getenv(const char *name)
 474{
 475        char *result = getenv(name);
 476        if (!result && !strcmp(name, "TMPDIR")) {
 477                /* on Windows it is TMP and TEMP */
 478                result = getenv("TMP");
 479                if (!result)
 480                        result = getenv("TEMP");
 481        }
 482        return result;
 483}
 484
 485/*
 486 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 487 * (Parsing C++ Command-Line Arguments)
 488 */
 489static const char *quote_arg(const char *arg)
 490{
 491        /* count chars to quote */
 492        int len = 0, n = 0;
 493        int force_quotes = 0;
 494        char *q, *d;
 495        const char *p = arg;
 496        if (!*p) force_quotes = 1;
 497        while (*p) {
 498                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 499                        force_quotes = 1;
 500                else if (*p == '"')
 501                        n++;
 502                else if (*p == '\\') {
 503                        int count = 0;
 504                        while (*p == '\\') {
 505                                count++;
 506                                p++;
 507                                len++;
 508                        }
 509                        if (*p == '"')
 510                                n += count*2 + 1;
 511                        continue;
 512                }
 513                len++;
 514                p++;
 515        }
 516        if (!force_quotes && n == 0)
 517                return arg;
 518
 519        /* insert \ where necessary */
 520        d = q = xmalloc(len+n+3);
 521        *d++ = '"';
 522        while (*arg) {
 523                if (*arg == '"')
 524                        *d++ = '\\';
 525                else if (*arg == '\\') {
 526                        int count = 0;
 527                        while (*arg == '\\') {
 528                                count++;
 529                                *d++ = *arg++;
 530                        }
 531                        if (*arg == '"') {
 532                                while (count-- > 0)
 533                                        *d++ = '\\';
 534                                *d++ = '\\';
 535                        }
 536                }
 537                *d++ = *arg++;
 538        }
 539        *d++ = '"';
 540        *d++ = 0;
 541        return q;
 542}
 543
 544static const char *parse_interpreter(const char *cmd)
 545{
 546        static char buf[100];
 547        char *p, *opt;
 548        int n, fd;
 549
 550        /* don't even try a .exe */
 551        n = strlen(cmd);
 552        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 553                return NULL;
 554
 555        fd = open(cmd, O_RDONLY);
 556        if (fd < 0)
 557                return NULL;
 558        n = read(fd, buf, sizeof(buf)-1);
 559        close(fd);
 560        if (n < 4)      /* at least '#!/x' and not error */
 561                return NULL;
 562
 563        if (buf[0] != '#' || buf[1] != '!')
 564                return NULL;
 565        buf[n] = '\0';
 566        p = buf + strcspn(buf, "\r\n");
 567        if (!*p)
 568                return NULL;
 569
 570        *p = '\0';
 571        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 572                return NULL;
 573        /* strip options */
 574        if ((opt = strchr(p+1, ' ')))
 575                *opt = '\0';
 576        return p+1;
 577}
 578
 579/*
 580 * Splits the PATH into parts.
 581 */
 582static char **get_path_split(void)
 583{
 584        char *p, **path, *envpath = getenv("PATH");
 585        int i, n = 0;
 586
 587        if (!envpath || !*envpath)
 588                return NULL;
 589
 590        envpath = xstrdup(envpath);
 591        p = envpath;
 592        while (p) {
 593                char *dir = p;
 594                p = strchr(p, ';');
 595                if (p) *p++ = '\0';
 596                if (*dir) {     /* not earlier, catches series of ; */
 597                        ++n;
 598                }
 599        }
 600        if (!n)
 601                return NULL;
 602
 603        path = xmalloc((n+1)*sizeof(char *));
 604        p = envpath;
 605        i = 0;
 606        do {
 607                if (*p)
 608                        path[i++] = xstrdup(p);
 609                p = p+strlen(p)+1;
 610        } while (i < n);
 611        path[i] = NULL;
 612
 613        free(envpath);
 614
 615        return path;
 616}
 617
 618static void free_path_split(char **path)
 619{
 620        char **p = path;
 621
 622        if (!path)
 623                return;
 624
 625        while (*p)
 626                free(*p++);
 627        free(path);
 628}
 629
 630/*
 631 * exe_only means that we only want to detect .exe files, but not scripts
 632 * (which do not have an extension)
 633 */
 634static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 635{
 636        char path[MAX_PATH];
 637        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 638
 639        if (!isexe && access(path, F_OK) == 0)
 640                return xstrdup(path);
 641        path[strlen(path)-4] = '\0';
 642        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 643                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 644                        return xstrdup(path);
 645        return NULL;
 646}
 647
 648/*
 649 * Determines the absolute path of cmd using the the split path in path.
 650 * If cmd contains a slash or backslash, no lookup is performed.
 651 */
 652static char *path_lookup(const char *cmd, char **path, int exe_only)
 653{
 654        char *prog = NULL;
 655        int len = strlen(cmd);
 656        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 657
 658        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 659                prog = xstrdup(cmd);
 660
 661        while (!prog && *path)
 662                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 663
 664        return prog;
 665}
 666
 667static int env_compare(const void *a, const void *b)
 668{
 669        char *const *ea = a;
 670        char *const *eb = b;
 671        return strcasecmp(*ea, *eb);
 672}
 673
 674static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 675                              const char *dir,
 676                              int prepend_cmd, int fhin, int fhout, int fherr)
 677{
 678        STARTUPINFO si;
 679        PROCESS_INFORMATION pi;
 680        struct strbuf envblk, args;
 681        unsigned flags;
 682        BOOL ret;
 683
 684        /* Determine whether or not we are associated to a console */
 685        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 686                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 687                        FILE_ATTRIBUTE_NORMAL, NULL);
 688        if (cons == INVALID_HANDLE_VALUE) {
 689                /* There is no console associated with this process.
 690                 * Since the child is a console process, Windows
 691                 * would normally create a console window. But
 692                 * since we'll be redirecting std streams, we do
 693                 * not need the console.
 694                 * It is necessary to use DETACHED_PROCESS
 695                 * instead of CREATE_NO_WINDOW to make ssh
 696                 * recognize that it has no console.
 697                 */
 698                flags = DETACHED_PROCESS;
 699        } else {
 700                /* There is already a console. If we specified
 701                 * DETACHED_PROCESS here, too, Windows would
 702                 * disassociate the child from the console.
 703                 * The same is true for CREATE_NO_WINDOW.
 704                 * Go figure!
 705                 */
 706                flags = 0;
 707                CloseHandle(cons);
 708        }
 709        memset(&si, 0, sizeof(si));
 710        si.cb = sizeof(si);
 711        si.dwFlags = STARTF_USESTDHANDLES;
 712        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 713        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 714        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 715
 716        /* concatenate argv, quoting args as we go */
 717        strbuf_init(&args, 0);
 718        if (prepend_cmd) {
 719                char *quoted = (char *)quote_arg(cmd);
 720                strbuf_addstr(&args, quoted);
 721                if (quoted != cmd)
 722                        free(quoted);
 723        }
 724        for (; *argv; argv++) {
 725                char *quoted = (char *)quote_arg(*argv);
 726                if (*args.buf)
 727                        strbuf_addch(&args, ' ');
 728                strbuf_addstr(&args, quoted);
 729                if (quoted != *argv)
 730                        free(quoted);
 731        }
 732
 733        if (env) {
 734                int count = 0;
 735                char **e, **sorted_env;
 736
 737                for (e = env; *e; e++)
 738                        count++;
 739
 740                /* environment must be sorted */
 741                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 742                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 743                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 744
 745                strbuf_init(&envblk, 0);
 746                for (e = sorted_env; *e; e++) {
 747                        strbuf_addstr(&envblk, *e);
 748                        strbuf_addch(&envblk, '\0');
 749                }
 750                free(sorted_env);
 751        }
 752
 753        memset(&pi, 0, sizeof(pi));
 754        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 755                env ? envblk.buf : NULL, dir, &si, &pi);
 756
 757        if (env)
 758                strbuf_release(&envblk);
 759        strbuf_release(&args);
 760
 761        if (!ret) {
 762                errno = ENOENT;
 763                return -1;
 764        }
 765        CloseHandle(pi.hThread);
 766        return (pid_t)pi.hProcess;
 767}
 768
 769static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 770                           int prepend_cmd)
 771{
 772        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 773}
 774
 775pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 776                     const char *dir,
 777                     int fhin, int fhout, int fherr)
 778{
 779        pid_t pid;
 780        char **path = get_path_split();
 781        char *prog = path_lookup(cmd, path, 0);
 782
 783        if (!prog) {
 784                errno = ENOENT;
 785                pid = -1;
 786        }
 787        else {
 788                const char *interpr = parse_interpreter(prog);
 789
 790                if (interpr) {
 791                        const char *argv0 = argv[0];
 792                        char *iprog = path_lookup(interpr, path, 1);
 793                        argv[0] = prog;
 794                        if (!iprog) {
 795                                errno = ENOENT;
 796                                pid = -1;
 797                        }
 798                        else {
 799                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 800                                                       fhin, fhout, fherr);
 801                                free(iprog);
 802                        }
 803                        argv[0] = argv0;
 804                }
 805                else
 806                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 807                                               fhin, fhout, fherr);
 808                free(prog);
 809        }
 810        free_path_split(path);
 811        return pid;
 812}
 813
 814static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 815{
 816        const char *interpr = parse_interpreter(cmd);
 817        char **path;
 818        char *prog;
 819        int pid = 0;
 820
 821        if (!interpr)
 822                return 0;
 823        path = get_path_split();
 824        prog = path_lookup(interpr, path, 1);
 825        if (prog) {
 826                int argc = 0;
 827                const char **argv2;
 828                while (argv[argc]) argc++;
 829                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 830                argv2[0] = (char *)cmd; /* full path to the script file */
 831                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 832                pid = mingw_spawnve(prog, argv2, env, 1);
 833                if (pid >= 0) {
 834                        int status;
 835                        if (waitpid(pid, &status, 0) < 0)
 836                                status = 255;
 837                        exit(status);
 838                }
 839                pid = 1;        /* indicate that we tried but failed */
 840                free(prog);
 841                free(argv2);
 842        }
 843        free_path_split(path);
 844        return pid;
 845}
 846
 847static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 848{
 849        /* check if git_command is a shell script */
 850        if (!try_shell_exec(cmd, argv, (char **)env)) {
 851                int pid, status;
 852
 853                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 854                if (pid < 0)
 855                        return;
 856                if (waitpid(pid, &status, 0) < 0)
 857                        status = 255;
 858                exit(status);
 859        }
 860}
 861
 862void mingw_execvp(const char *cmd, char *const *argv)
 863{
 864        char **path = get_path_split();
 865        char *prog = path_lookup(cmd, path, 0);
 866
 867        if (prog) {
 868                mingw_execve(prog, argv, environ);
 869                free(prog);
 870        } else
 871                errno = ENOENT;
 872
 873        free_path_split(path);
 874}
 875
 876static char **copy_environ(void)
 877{
 878        char **env;
 879        int i = 0;
 880        while (environ[i])
 881                i++;
 882        env = xmalloc((i+1)*sizeof(*env));
 883        for (i = 0; environ[i]; i++)
 884                env[i] = xstrdup(environ[i]);
 885        env[i] = NULL;
 886        return env;
 887}
 888
 889void free_environ(char **env)
 890{
 891        int i;
 892        for (i = 0; env[i]; i++)
 893                free(env[i]);
 894        free(env);
 895}
 896
 897static int lookup_env(char **env, const char *name, size_t nmln)
 898{
 899        int i;
 900
 901        for (i = 0; env[i]; i++) {
 902                if (0 == strncmp(env[i], name, nmln)
 903                    && '=' == env[i][nmln])
 904                        /* matches */
 905                        return i;
 906        }
 907        return -1;
 908}
 909
 910/*
 911 * If name contains '=', then sets the variable, otherwise it unsets it
 912 */
 913static char **env_setenv(char **env, const char *name)
 914{
 915        char *eq = strchrnul(name, '=');
 916        int i = lookup_env(env, name, eq-name);
 917
 918        if (i < 0) {
 919                if (*eq) {
 920                        for (i = 0; env[i]; i++)
 921                                ;
 922                        env = xrealloc(env, (i+2)*sizeof(*env));
 923                        env[i] = xstrdup(name);
 924                        env[i+1] = NULL;
 925                }
 926        }
 927        else {
 928                free(env[i]);
 929                if (*eq)
 930                        env[i] = xstrdup(name);
 931                else
 932                        for (; env[i]; i++)
 933                                env[i] = env[i+1];
 934        }
 935        return env;
 936}
 937
 938/*
 939 * Copies global environ and adjusts variables as specified by vars.
 940 */
 941char **make_augmented_environ(const char *const *vars)
 942{
 943        char **env = copy_environ();
 944
 945        while (*vars)
 946                env = env_setenv(env, *vars++);
 947        return env;
 948}
 949
 950/*
 951 * Note, this isn't a complete replacement for getaddrinfo. It assumes
 952 * that service contains a numerical port, or that it it is null. It
 953 * does a simple search using gethostbyname, and returns one IPv4 host
 954 * if one was found.
 955 */
 956static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 957                                   const struct addrinfo *hints,
 958                                   struct addrinfo **res)
 959{
 960        struct hostent *h = gethostbyname(node);
 961        struct addrinfo *ai;
 962        struct sockaddr_in *sin;
 963
 964        if (!h)
 965                return WSAGetLastError();
 966
 967        ai = xmalloc(sizeof(struct addrinfo));
 968        *res = ai;
 969        ai->ai_flags = 0;
 970        ai->ai_family = AF_INET;
 971        ai->ai_socktype = hints->ai_socktype;
 972        switch (hints->ai_socktype) {
 973        case SOCK_STREAM:
 974                ai->ai_protocol = IPPROTO_TCP;
 975                break;
 976        case SOCK_DGRAM:
 977                ai->ai_protocol = IPPROTO_UDP;
 978                break;
 979        default:
 980                ai->ai_protocol = 0;
 981                break;
 982        }
 983        ai->ai_addrlen = sizeof(struct sockaddr_in);
 984        ai->ai_canonname = strdup(h->h_name);
 985
 986        sin = xmalloc(ai->ai_addrlen);
 987        memset(sin, 0, ai->ai_addrlen);
 988        sin->sin_family = AF_INET;
 989        if (service)
 990                sin->sin_port = htons(atoi(service));
 991        sin->sin_addr = *(struct in_addr *)h->h_addr;
 992        ai->ai_addr = (struct sockaddr *)sin;
 993        ai->ai_next = 0;
 994        return 0;
 995}
 996
 997static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 998{
 999        free(res->ai_canonname);
1000        free(res->ai_addr);
1001        free(res);
1002}
1003
1004static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1005                                   char *host, DWORD hostlen,
1006                                   char *serv, DWORD servlen, int flags)
1007{
1008        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1009        if (sa->sa_family != AF_INET)
1010                return EAI_FAMILY;
1011        if (!host && !serv)
1012                return EAI_NONAME;
1013
1014        if (host && hostlen > 0) {
1015                struct hostent *ent = NULL;
1016                if (!(flags & NI_NUMERICHOST))
1017                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1018                                            sizeof(sin->sin_addr), AF_INET);
1019
1020                if (ent)
1021                        snprintf(host, hostlen, "%s", ent->h_name);
1022                else if (flags & NI_NAMEREQD)
1023                        return EAI_NONAME;
1024                else
1025                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1026        }
1027
1028        if (serv && servlen > 0) {
1029                struct servent *ent = NULL;
1030                if (!(flags & NI_NUMERICSERV))
1031                        ent = getservbyport(sin->sin_port,
1032                                            flags & NI_DGRAM ? "udp" : "tcp");
1033
1034                if (ent)
1035                        snprintf(serv, servlen, "%s", ent->s_name);
1036                else
1037                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1038        }
1039
1040        return 0;
1041}
1042
1043static HMODULE ipv6_dll = NULL;
1044static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1045static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1046                                      const struct addrinfo *hints,
1047                                      struct addrinfo **res);
1048static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1049                                      char *host, DWORD hostlen,
1050                                      char *serv, DWORD servlen, int flags);
1051/*
1052 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1053 * don't need to try to load that one dynamically.
1054 */
1055
1056static void socket_cleanup(void)
1057{
1058        WSACleanup();
1059        if (ipv6_dll)
1060                FreeLibrary(ipv6_dll);
1061        ipv6_dll = NULL;
1062        ipv6_freeaddrinfo = freeaddrinfo_stub;
1063        ipv6_getaddrinfo = getaddrinfo_stub;
1064        ipv6_getnameinfo = getnameinfo_stub;
1065}
1066
1067static void ensure_socket_initialization(void)
1068{
1069        WSADATA wsa;
1070        static int initialized = 0;
1071        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1072        const char **name;
1073
1074        if (initialized)
1075                return;
1076
1077        if (WSAStartup(MAKEWORD(2,2), &wsa))
1078                die("unable to initialize winsock subsystem, error %d",
1079                        WSAGetLastError());
1080
1081        for (name = libraries; *name; name++) {
1082                ipv6_dll = LoadLibrary(*name);
1083                if (!ipv6_dll)
1084                        continue;
1085
1086                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1087                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1088                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1089                                                   const struct addrinfo *,
1090                                                   struct addrinfo **))
1091                        GetProcAddress(ipv6_dll, "getaddrinfo");
1092                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1093                                                   socklen_t, char *, DWORD,
1094                                                   char *, DWORD, int))
1095                        GetProcAddress(ipv6_dll, "getnameinfo");
1096                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1097                        FreeLibrary(ipv6_dll);
1098                        ipv6_dll = NULL;
1099                } else
1100                        break;
1101        }
1102        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1103                ipv6_freeaddrinfo = freeaddrinfo_stub;
1104                ipv6_getaddrinfo = getaddrinfo_stub;
1105                ipv6_getnameinfo = getnameinfo_stub;
1106        }
1107
1108        atexit(socket_cleanup);
1109        initialized = 1;
1110}
1111
1112#undef gethostbyname
1113struct hostent *mingw_gethostbyname(const char *host)
1114{
1115        ensure_socket_initialization();
1116        return gethostbyname(host);
1117}
1118
1119void mingw_freeaddrinfo(struct addrinfo *res)
1120{
1121        ipv6_freeaddrinfo(res);
1122}
1123
1124int mingw_getaddrinfo(const char *node, const char *service,
1125                      const struct addrinfo *hints, struct addrinfo **res)
1126{
1127        ensure_socket_initialization();
1128        return ipv6_getaddrinfo(node, service, hints, res);
1129}
1130
1131int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1132                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1133                      int flags)
1134{
1135        ensure_socket_initialization();
1136        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1137}
1138
1139int mingw_socket(int domain, int type, int protocol)
1140{
1141        int sockfd;
1142        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1143        if (s == INVALID_SOCKET) {
1144                /*
1145                 * WSAGetLastError() values are regular BSD error codes
1146                 * biased by WSABASEERR.
1147                 * However, strerror() does not know about networking
1148                 * specific errors, which are values beginning at 38 or so.
1149                 * Therefore, we choose to leave the biased error code
1150                 * in errno so that _if_ someone looks up the code somewhere,
1151                 * then it is at least the number that are usually listed.
1152                 */
1153                errno = WSAGetLastError();
1154                return -1;
1155        }
1156        /* convert into a file descriptor */
1157        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1158                closesocket(s);
1159                return error("unable to make a socket file descriptor: %s",
1160                        strerror(errno));
1161        }
1162        return sockfd;
1163}
1164
1165#undef connect
1166int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1167{
1168        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1169        return connect(s, sa, sz);
1170}
1171
1172#undef rename
1173int mingw_rename(const char *pold, const char *pnew)
1174{
1175        DWORD attrs, gle;
1176        int tries = 0;
1177        static const int delay[] = { 0, 1, 10, 20, 40 };
1178
1179        /*
1180         * Try native rename() first to get errno right.
1181         * It is based on MoveFile(), which cannot overwrite existing files.
1182         */
1183        if (!rename(pold, pnew))
1184                return 0;
1185        if (errno != EEXIST)
1186                return -1;
1187repeat:
1188        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1189                return 0;
1190        /* TODO: translate more errors */
1191        gle = GetLastError();
1192        if (gle == ERROR_ACCESS_DENIED &&
1193            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1194                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1195                        errno = EISDIR;
1196                        return -1;
1197                }
1198                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1199                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1200                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1201                                return 0;
1202                        gle = GetLastError();
1203                        /* revert file attributes on failure */
1204                        SetFileAttributes(pnew, attrs);
1205                }
1206        }
1207        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1208                /*
1209                 * We assume that some other process had the source or
1210                 * destination file open at the wrong moment and retry.
1211                 * In order to give the other process a higher chance to
1212                 * complete its operation, we give up our time slice now.
1213                 * If we have to retry again, we do sleep a bit.
1214                 */
1215                Sleep(delay[tries]);
1216                tries++;
1217                goto repeat;
1218        }
1219        errno = EACCES;
1220        return -1;
1221}
1222
1223/*
1224 * Note that this doesn't return the actual pagesize, but
1225 * the allocation granularity. If future Windows specific git code
1226 * needs the real getpagesize function, we need to find another solution.
1227 */
1228int mingw_getpagesize(void)
1229{
1230        SYSTEM_INFO si;
1231        GetSystemInfo(&si);
1232        return si.dwAllocationGranularity;
1233}
1234
1235struct passwd *getpwuid(int uid)
1236{
1237        static char user_name[100];
1238        static struct passwd p;
1239
1240        DWORD len = sizeof(user_name);
1241        if (!GetUserName(user_name, &len))
1242                return NULL;
1243        p.pw_name = user_name;
1244        p.pw_gecos = "unknown";
1245        p.pw_dir = NULL;
1246        return &p;
1247}
1248
1249static HANDLE timer_event;
1250static HANDLE timer_thread;
1251static int timer_interval;
1252static int one_shot;
1253static sig_handler_t timer_fn = SIG_DFL;
1254
1255/* The timer works like this:
1256 * The thread, ticktack(), is a trivial routine that most of the time
1257 * only waits to receive the signal to terminate. The main thread tells
1258 * the thread to terminate by setting the timer_event to the signalled
1259 * state.
1260 * But ticktack() interrupts the wait state after the timer's interval
1261 * length to call the signal handler.
1262 */
1263
1264static unsigned __stdcall ticktack(void *dummy)
1265{
1266        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1267                if (timer_fn == SIG_DFL)
1268                        die("Alarm");
1269                if (timer_fn != SIG_IGN)
1270                        timer_fn(SIGALRM);
1271                if (one_shot)
1272                        break;
1273        }
1274        return 0;
1275}
1276
1277static int start_timer_thread(void)
1278{
1279        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1280        if (timer_event) {
1281                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1282                if (!timer_thread )
1283                        return errno = ENOMEM,
1284                                error("cannot start timer thread");
1285        } else
1286                return errno = ENOMEM,
1287                        error("cannot allocate resources for timer");
1288        return 0;
1289}
1290
1291static void stop_timer_thread(void)
1292{
1293        if (timer_event)
1294                SetEvent(timer_event);  /* tell thread to terminate */
1295        if (timer_thread) {
1296                int rc = WaitForSingleObject(timer_thread, 1000);
1297                if (rc == WAIT_TIMEOUT)
1298                        error("timer thread did not terminate timely");
1299                else if (rc != WAIT_OBJECT_0)
1300                        error("waiting for timer thread failed: %lu",
1301                              GetLastError());
1302                CloseHandle(timer_thread);
1303        }
1304        if (timer_event)
1305                CloseHandle(timer_event);
1306        timer_event = NULL;
1307        timer_thread = NULL;
1308}
1309
1310static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1311{
1312        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1313}
1314
1315int setitimer(int type, struct itimerval *in, struct itimerval *out)
1316{
1317        static const struct timeval zero;
1318        static int atexit_done;
1319
1320        if (out != NULL)
1321                return errno = EINVAL,
1322                        error("setitimer param 3 != NULL not implemented");
1323        if (!is_timeval_eq(&in->it_interval, &zero) &&
1324            !is_timeval_eq(&in->it_interval, &in->it_value))
1325                return errno = EINVAL,
1326                        error("setitimer: it_interval must be zero or eq it_value");
1327
1328        if (timer_thread)
1329                stop_timer_thread();
1330
1331        if (is_timeval_eq(&in->it_value, &zero) &&
1332            is_timeval_eq(&in->it_interval, &zero))
1333                return 0;
1334
1335        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1336        one_shot = is_timeval_eq(&in->it_interval, &zero);
1337        if (!atexit_done) {
1338                atexit(stop_timer_thread);
1339                atexit_done = 1;
1340        }
1341        return start_timer_thread();
1342}
1343
1344int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1345{
1346        if (sig != SIGALRM)
1347                return errno = EINVAL,
1348                        error("sigaction only implemented for SIGALRM");
1349        if (out != NULL)
1350                return errno = EINVAL,
1351                        error("sigaction: param 3 != NULL not implemented");
1352
1353        timer_fn = in->sa_handler;
1354        return 0;
1355}
1356
1357#undef signal
1358sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1359{
1360        sig_handler_t old = timer_fn;
1361        if (sig != SIGALRM)
1362                return signal(sig, handler);
1363        timer_fn = handler;
1364        return old;
1365}
1366
1367static const char *make_backslash_path(const char *path)
1368{
1369        static char buf[PATH_MAX + 1];
1370        char *c;
1371
1372        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1373                die("Too long path: %.*s", 60, path);
1374
1375        for (c = buf; *c; c++) {
1376                if (*c == '/')
1377                        *c = '\\';
1378        }
1379        return buf;
1380}
1381
1382void mingw_open_html(const char *unixpath)
1383{
1384        const char *htmlpath = make_backslash_path(unixpath);
1385        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1386                        const char *, const char *, const char *, INT);
1387        T ShellExecute;
1388        HMODULE shell32;
1389
1390        shell32 = LoadLibrary("shell32.dll");
1391        if (!shell32)
1392                die("cannot load shell32.dll");
1393        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1394        if (!ShellExecute)
1395                die("cannot run browser");
1396
1397        printf("Launching default browser to display HTML ...\n");
1398        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1399
1400        FreeLibrary(shell32);
1401}
1402
1403int link(const char *oldpath, const char *newpath)
1404{
1405        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1406        static T create_hard_link = NULL;
1407        if (!create_hard_link) {
1408                create_hard_link = (T) GetProcAddress(
1409                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1410                if (!create_hard_link)
1411                        create_hard_link = (T)-1;
1412        }
1413        if (create_hard_link == (T)-1) {
1414                errno = ENOSYS;
1415                return -1;
1416        }
1417        if (!create_hard_link(newpath, oldpath, NULL)) {
1418                errno = err_win_to_posix(GetLastError());
1419                return -1;
1420        }
1421        return 0;
1422}
1423
1424char *getpass(const char *prompt)
1425{
1426        struct strbuf buf = STRBUF_INIT;
1427
1428        fputs(prompt, stderr);
1429        for (;;) {
1430                char c = _getch();
1431                if (c == '\r' || c == '\n')
1432                        break;
1433                strbuf_addch(&buf, c);
1434        }
1435        fputs("\n", stderr);
1436        return strbuf_detach(&buf, NULL);
1437}
1438
1439#ifndef NO_MINGW_REPLACE_READDIR
1440/* MinGW readdir implementation to avoid extra lstats for Git */
1441struct mingw_DIR
1442{
1443        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1444        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1445        long                    dd_handle;      /* _findnext handle */
1446        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1447        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1448};
1449
1450struct dirent *mingw_readdir(DIR *dir)
1451{
1452        WIN32_FIND_DATAA buf;
1453        HANDLE handle;
1454        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1455
1456        if (!dir->dd_handle) {
1457                errno = EBADF; /* No set_errno for mingw */
1458                return NULL;
1459        }
1460
1461        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1462        {
1463                DWORD lasterr;
1464                handle = FindFirstFileA(dir->dd_name, &buf);
1465                lasterr = GetLastError();
1466                dir->dd_handle = (long)handle;
1467                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1468                        errno = err_win_to_posix(lasterr);
1469                        return NULL;
1470                }
1471        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1472                return NULL;
1473        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1474                DWORD lasterr = GetLastError();
1475                FindClose((HANDLE)dir->dd_handle);
1476                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1477                /* POSIX says you shouldn't set errno when readdir can't
1478                   find any more files; so, if another error we leave it set. */
1479                if (lasterr != ERROR_NO_MORE_FILES)
1480                        errno = err_win_to_posix(lasterr);
1481                return NULL;
1482        }
1483
1484        /* We get here if `buf' contains valid data.  */
1485        strcpy(dir->dd_dir.d_name, buf.cFileName);
1486        ++dir->dd_stat;
1487
1488        /* Set file type, based on WIN32_FIND_DATA */
1489        mdir->dd_dir.d_type = 0;
1490        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1491                mdir->dd_dir.d_type |= DT_DIR;
1492        else
1493                mdir->dd_dir.d_type |= DT_REG;
1494
1495        return (struct dirent*)&dir->dd_dir;
1496}
1497#endif // !NO_MINGW_REPLACE_READDIR