Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit Merge branch 'bw/template-tool-buildconfig' (0cb050a)
   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 fopen
 144FILE *mingw_fopen (const char *filename, const char *otype)
 145{
 146        if (!strcmp(filename, "/dev/null"))
 147                filename = "nul";
 148        return fopen(filename, otype);
 149}
 150
 151#undef freopen
 152FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 153{
 154        if (filename && !strcmp(filename, "/dev/null"))
 155                filename = "nul";
 156        return freopen(filename, otype, stream);
 157}
 158
 159/*
 160 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 161 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 162 */
 163static inline long long filetime_to_hnsec(const FILETIME *ft)
 164{
 165        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 166        /* Windows to Unix Epoch conversion */
 167        return winTime - 116444736000000000LL;
 168}
 169
 170static inline time_t filetime_to_time_t(const FILETIME *ft)
 171{
 172        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 173}
 174
 175/* We keep the do_lstat code in a separate function to avoid recursion.
 176 * When a path ends with a slash, the stat will fail with ENOENT. In
 177 * this case, we strip the trailing slashes and stat again.
 178 */
 179static int do_lstat(const char *file_name, struct stat *buf)
 180{
 181        WIN32_FILE_ATTRIBUTE_DATA fdata;
 182
 183        if (!(errno = get_file_attr(file_name, &fdata))) {
 184                buf->st_ino = 0;
 185                buf->st_gid = 0;
 186                buf->st_uid = 0;
 187                buf->st_nlink = 1;
 188                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 189                buf->st_size = fdata.nFileSizeLow |
 190                        (((off_t)fdata.nFileSizeHigh)<<32);
 191                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 192                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 193                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 194                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 195                return 0;
 196        }
 197        return -1;
 198}
 199
 200/* We provide our own lstat/fstat functions, since the provided
 201 * lstat/fstat functions are so slow. These stat functions are
 202 * tailored for Git's usage (read: fast), and are not meant to be
 203 * complete. Note that Git stat()s are redirected to mingw_lstat()
 204 * too, since Windows doesn't really handle symlinks that well.
 205 */
 206int mingw_lstat(const char *file_name, struct stat *buf)
 207{
 208        int namelen;
 209        static char alt_name[PATH_MAX];
 210
 211        if (!do_lstat(file_name, buf))
 212                return 0;
 213
 214        /* if file_name ended in a '/', Windows returned ENOENT;
 215         * try again without trailing slashes
 216         */
 217        if (errno != ENOENT)
 218                return -1;
 219
 220        namelen = strlen(file_name);
 221        if (namelen && file_name[namelen-1] != '/')
 222                return -1;
 223        while (namelen && file_name[namelen-1] == '/')
 224                --namelen;
 225        if (!namelen || namelen >= PATH_MAX)
 226                return -1;
 227
 228        memcpy(alt_name, file_name, namelen);
 229        alt_name[namelen] = 0;
 230        return do_lstat(alt_name, buf);
 231}
 232
 233#undef fstat
 234int mingw_fstat(int fd, struct stat *buf)
 235{
 236        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 237        BY_HANDLE_FILE_INFORMATION fdata;
 238
 239        if (fh == INVALID_HANDLE_VALUE) {
 240                errno = EBADF;
 241                return -1;
 242        }
 243        /* direct non-file handles to MS's fstat() */
 244        if (GetFileType(fh) != FILE_TYPE_DISK)
 245                return _fstati64(fd, buf);
 246
 247        if (GetFileInformationByHandle(fh, &fdata)) {
 248                buf->st_ino = 0;
 249                buf->st_gid = 0;
 250                buf->st_uid = 0;
 251                buf->st_nlink = 1;
 252                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 253                buf->st_size = fdata.nFileSizeLow |
 254                        (((off_t)fdata.nFileSizeHigh)<<32);
 255                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 256                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 257                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 258                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 259                return 0;
 260        }
 261        errno = EBADF;
 262        return -1;
 263}
 264
 265static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 266{
 267        long long winTime = t * 10000000LL + 116444736000000000LL;
 268        ft->dwLowDateTime = winTime;
 269        ft->dwHighDateTime = winTime >> 32;
 270}
 271
 272int mingw_utime (const char *file_name, const struct utimbuf *times)
 273{
 274        FILETIME mft, aft;
 275        int fh, rc;
 276
 277        /* must have write permission */
 278        DWORD attrs = GetFileAttributes(file_name);
 279        if (attrs != INVALID_FILE_ATTRIBUTES &&
 280            (attrs & FILE_ATTRIBUTE_READONLY)) {
 281                /* ignore errors here; open() will report them */
 282                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 283        }
 284
 285        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 286                rc = -1;
 287                goto revert_attrs;
 288        }
 289
 290        time_t_to_filetime(times->modtime, &mft);
 291        time_t_to_filetime(times->actime, &aft);
 292        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 293                errno = EINVAL;
 294                rc = -1;
 295        } else
 296                rc = 0;
 297        close(fh);
 298
 299revert_attrs:
 300        if (attrs != INVALID_FILE_ATTRIBUTES &&
 301            (attrs & FILE_ATTRIBUTE_READONLY)) {
 302                /* ignore errors again */
 303                SetFileAttributes(file_name, attrs);
 304        }
 305        return rc;
 306}
 307
 308unsigned int sleep (unsigned int seconds)
 309{
 310        Sleep(seconds*1000);
 311        return 0;
 312}
 313
 314int mkstemp(char *template)
 315{
 316        char *filename = mktemp(template);
 317        if (filename == NULL)
 318                return -1;
 319        return open(filename, O_RDWR | O_CREAT, 0600);
 320}
 321
 322int gettimeofday(struct timeval *tv, void *tz)
 323{
 324        FILETIME ft;
 325        long long hnsec;
 326
 327        GetSystemTimeAsFileTime(&ft);
 328        hnsec = filetime_to_hnsec(&ft);
 329        tv->tv_sec = hnsec / 10000000;
 330        tv->tv_usec = (hnsec % 10000000) / 10;
 331        return 0;
 332}
 333
 334int pipe(int filedes[2])
 335{
 336        HANDLE h[2];
 337
 338        /* this creates non-inheritable handles */
 339        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 340                errno = err_win_to_posix(GetLastError());
 341                return -1;
 342        }
 343        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 344        if (filedes[0] < 0) {
 345                CloseHandle(h[0]);
 346                CloseHandle(h[1]);
 347                return -1;
 348        }
 349        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 350        if (filedes[0] < 0) {
 351                close(filedes[0]);
 352                CloseHandle(h[1]);
 353                return -1;
 354        }
 355        return 0;
 356}
 357
 358int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 359{
 360        int i, pending;
 361
 362        if (timeout >= 0) {
 363                if (nfds == 0) {
 364                        Sleep(timeout);
 365                        return 0;
 366                }
 367                return errno = EINVAL, error("poll timeout not supported");
 368        }
 369
 370        /* When there is only one fd to wait for, then we pretend that
 371         * input is available and let the actual wait happen when the
 372         * caller invokes read().
 373         */
 374        if (nfds == 1) {
 375                if (!(ufds[0].events & POLLIN))
 376                        return errno = EINVAL, error("POLLIN not set");
 377                ufds[0].revents = POLLIN;
 378                return 0;
 379        }
 380
 381repeat:
 382        pending = 0;
 383        for (i = 0; i < nfds; i++) {
 384                DWORD avail = 0;
 385                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 386                if (h == INVALID_HANDLE_VALUE)
 387                        return -1;      /* errno was set */
 388
 389                if (!(ufds[i].events & POLLIN))
 390                        return errno = EINVAL, error("POLLIN not set");
 391
 392                /* this emulation works only for pipes */
 393                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 394                        int err = GetLastError();
 395                        if (err == ERROR_BROKEN_PIPE) {
 396                                ufds[i].revents = POLLHUP;
 397                                pending++;
 398                        } else {
 399                                errno = EINVAL;
 400                                return error("PeekNamedPipe failed,"
 401                                        " GetLastError: %u", err);
 402                        }
 403                } else if (avail) {
 404                        ufds[i].revents = POLLIN;
 405                        pending++;
 406                } else
 407                        ufds[i].revents = 0;
 408        }
 409        if (!pending) {
 410                /* The only times that we spin here is when the process
 411                 * that is connected through the pipes is waiting for
 412                 * its own input data to become available. But since
 413                 * the process (pack-objects) is itself CPU intensive,
 414                 * it will happily pick up the time slice that we are
 415                 * relinquishing here.
 416                 */
 417                Sleep(0);
 418                goto repeat;
 419        }
 420        return 0;
 421}
 422
 423struct tm *gmtime_r(const time_t *timep, struct tm *result)
 424{
 425        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 426        memcpy(result, gmtime(timep), sizeof(struct tm));
 427        return result;
 428}
 429
 430struct tm *localtime_r(const time_t *timep, struct tm *result)
 431{
 432        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 433        memcpy(result, localtime(timep), sizeof(struct tm));
 434        return result;
 435}
 436
 437#undef getcwd
 438char *mingw_getcwd(char *pointer, int len)
 439{
 440        int i;
 441        char *ret = getcwd(pointer, len);
 442        if (!ret)
 443                return ret;
 444        for (i = 0; pointer[i]; i++)
 445                if (pointer[i] == '\\')
 446                        pointer[i] = '/';
 447        return ret;
 448}
 449
 450#undef getenv
 451char *mingw_getenv(const char *name)
 452{
 453        char *result = getenv(name);
 454        if (!result && !strcmp(name, "TMPDIR")) {
 455                /* on Windows it is TMP and TEMP */
 456                result = getenv("TMP");
 457                if (!result)
 458                        result = getenv("TEMP");
 459        }
 460        return result;
 461}
 462
 463/*
 464 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 465 * (Parsing C++ Command-Line Arguments)
 466 */
 467static const char *quote_arg(const char *arg)
 468{
 469        /* count chars to quote */
 470        int len = 0, n = 0;
 471        int force_quotes = 0;
 472        char *q, *d;
 473        const char *p = arg;
 474        if (!*p) force_quotes = 1;
 475        while (*p) {
 476                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 477                        force_quotes = 1;
 478                else if (*p == '"')
 479                        n++;
 480                else if (*p == '\\') {
 481                        int count = 0;
 482                        while (*p == '\\') {
 483                                count++;
 484                                p++;
 485                                len++;
 486                        }
 487                        if (*p == '"')
 488                                n += count*2 + 1;
 489                        continue;
 490                }
 491                len++;
 492                p++;
 493        }
 494        if (!force_quotes && n == 0)
 495                return arg;
 496
 497        /* insert \ where necessary */
 498        d = q = xmalloc(len+n+3);
 499        *d++ = '"';
 500        while (*arg) {
 501                if (*arg == '"')
 502                        *d++ = '\\';
 503                else if (*arg == '\\') {
 504                        int count = 0;
 505                        while (*arg == '\\') {
 506                                count++;
 507                                *d++ = *arg++;
 508                        }
 509                        if (*arg == '"') {
 510                                while (count-- > 0)
 511                                        *d++ = '\\';
 512                                *d++ = '\\';
 513                        }
 514                }
 515                *d++ = *arg++;
 516        }
 517        *d++ = '"';
 518        *d++ = 0;
 519        return q;
 520}
 521
 522static const char *parse_interpreter(const char *cmd)
 523{
 524        static char buf[100];
 525        char *p, *opt;
 526        int n, fd;
 527
 528        /* don't even try a .exe */
 529        n = strlen(cmd);
 530        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 531                return NULL;
 532
 533        fd = open(cmd, O_RDONLY);
 534        if (fd < 0)
 535                return NULL;
 536        n = read(fd, buf, sizeof(buf)-1);
 537        close(fd);
 538        if (n < 4)      /* at least '#!/x' and not error */
 539                return NULL;
 540
 541        if (buf[0] != '#' || buf[1] != '!')
 542                return NULL;
 543        buf[n] = '\0';
 544        p = buf + strcspn(buf, "\r\n");
 545        if (!*p)
 546                return NULL;
 547
 548        *p = '\0';
 549        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 550                return NULL;
 551        /* strip options */
 552        if ((opt = strchr(p+1, ' ')))
 553                *opt = '\0';
 554        return p+1;
 555}
 556
 557/*
 558 * Splits the PATH into parts.
 559 */
 560static char **get_path_split(void)
 561{
 562        char *p, **path, *envpath = getenv("PATH");
 563        int i, n = 0;
 564
 565        if (!envpath || !*envpath)
 566                return NULL;
 567
 568        envpath = xstrdup(envpath);
 569        p = envpath;
 570        while (p) {
 571                char *dir = p;
 572                p = strchr(p, ';');
 573                if (p) *p++ = '\0';
 574                if (*dir) {     /* not earlier, catches series of ; */
 575                        ++n;
 576                }
 577        }
 578        if (!n)
 579                return NULL;
 580
 581        path = xmalloc((n+1)*sizeof(char *));
 582        p = envpath;
 583        i = 0;
 584        do {
 585                if (*p)
 586                        path[i++] = xstrdup(p);
 587                p = p+strlen(p)+1;
 588        } while (i < n);
 589        path[i] = NULL;
 590
 591        free(envpath);
 592
 593        return path;
 594}
 595
 596static void free_path_split(char **path)
 597{
 598        char **p = path;
 599
 600        if (!path)
 601                return;
 602
 603        while (*p)
 604                free(*p++);
 605        free(path);
 606}
 607
 608/*
 609 * exe_only means that we only want to detect .exe files, but not scripts
 610 * (which do not have an extension)
 611 */
 612static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 613{
 614        char path[MAX_PATH];
 615        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 616
 617        if (!isexe && access(path, F_OK) == 0)
 618                return xstrdup(path);
 619        path[strlen(path)-4] = '\0';
 620        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 621                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 622                        return xstrdup(path);
 623        return NULL;
 624}
 625
 626/*
 627 * Determines the absolute path of cmd using the the split path in path.
 628 * If cmd contains a slash or backslash, no lookup is performed.
 629 */
 630static char *path_lookup(const char *cmd, char **path, int exe_only)
 631{
 632        char *prog = NULL;
 633        int len = strlen(cmd);
 634        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 635
 636        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 637                prog = xstrdup(cmd);
 638
 639        while (!prog && *path)
 640                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 641
 642        return prog;
 643}
 644
 645static int env_compare(const void *a, const void *b)
 646{
 647        char *const *ea = a;
 648        char *const *eb = b;
 649        return strcasecmp(*ea, *eb);
 650}
 651
 652static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 653                              int prepend_cmd, int fhin, int fhout, int fherr)
 654{
 655        STARTUPINFO si;
 656        PROCESS_INFORMATION pi;
 657        struct strbuf envblk, args;
 658        unsigned flags;
 659        BOOL ret;
 660
 661        /* Determine whether or not we are associated to a console */
 662        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 663                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 664                        FILE_ATTRIBUTE_NORMAL, NULL);
 665        if (cons == INVALID_HANDLE_VALUE) {
 666                /* There is no console associated with this process.
 667                 * Since the child is a console process, Windows
 668                 * would normally create a console window. But
 669                 * since we'll be redirecting std streams, we do
 670                 * not need the console.
 671                 * It is necessary to use DETACHED_PROCESS
 672                 * instead of CREATE_NO_WINDOW to make ssh
 673                 * recognize that it has no console.
 674                 */
 675                flags = DETACHED_PROCESS;
 676        } else {
 677                /* There is already a console. If we specified
 678                 * DETACHED_PROCESS here, too, Windows would
 679                 * disassociate the child from the console.
 680                 * The same is true for CREATE_NO_WINDOW.
 681                 * Go figure!
 682                 */
 683                flags = 0;
 684                CloseHandle(cons);
 685        }
 686        memset(&si, 0, sizeof(si));
 687        si.cb = sizeof(si);
 688        si.dwFlags = STARTF_USESTDHANDLES;
 689        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 690        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 691        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 692
 693        /* concatenate argv, quoting args as we go */
 694        strbuf_init(&args, 0);
 695        if (prepend_cmd) {
 696                char *quoted = (char *)quote_arg(cmd);
 697                strbuf_addstr(&args, quoted);
 698                if (quoted != cmd)
 699                        free(quoted);
 700        }
 701        for (; *argv; argv++) {
 702                char *quoted = (char *)quote_arg(*argv);
 703                if (*args.buf)
 704                        strbuf_addch(&args, ' ');
 705                strbuf_addstr(&args, quoted);
 706                if (quoted != *argv)
 707                        free(quoted);
 708        }
 709
 710        if (env) {
 711                int count = 0;
 712                char **e, **sorted_env;
 713
 714                for (e = env; *e; e++)
 715                        count++;
 716
 717                /* environment must be sorted */
 718                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 719                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 720                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 721
 722                strbuf_init(&envblk, 0);
 723                for (e = sorted_env; *e; e++) {
 724                        strbuf_addstr(&envblk, *e);
 725                        strbuf_addch(&envblk, '\0');
 726                }
 727                free(sorted_env);
 728        }
 729
 730        memset(&pi, 0, sizeof(pi));
 731        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 732                env ? envblk.buf : NULL, NULL, &si, &pi);
 733
 734        if (env)
 735                strbuf_release(&envblk);
 736        strbuf_release(&args);
 737
 738        if (!ret) {
 739                errno = ENOENT;
 740                return -1;
 741        }
 742        CloseHandle(pi.hThread);
 743        return (pid_t)pi.hProcess;
 744}
 745
 746static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 747                           int prepend_cmd)
 748{
 749        return mingw_spawnve_fd(cmd, argv, env, prepend_cmd, 0, 1, 2);
 750}
 751
 752pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 753                     int fhin, int fhout, int fherr)
 754{
 755        pid_t pid;
 756        char **path = get_path_split();
 757        char *prog = path_lookup(cmd, path, 0);
 758
 759        if (!prog) {
 760                errno = ENOENT;
 761                pid = -1;
 762        }
 763        else {
 764                const char *interpr = parse_interpreter(prog);
 765
 766                if (interpr) {
 767                        const char *argv0 = argv[0];
 768                        char *iprog = path_lookup(interpr, path, 1);
 769                        argv[0] = prog;
 770                        if (!iprog) {
 771                                errno = ENOENT;
 772                                pid = -1;
 773                        }
 774                        else {
 775                                pid = mingw_spawnve_fd(iprog, argv, env, 1,
 776                                                       fhin, fhout, fherr);
 777                                free(iprog);
 778                        }
 779                        argv[0] = argv0;
 780                }
 781                else
 782                        pid = mingw_spawnve_fd(prog, argv, env, 0,
 783                                               fhin, fhout, fherr);
 784                free(prog);
 785        }
 786        free_path_split(path);
 787        return pid;
 788}
 789
 790static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 791{
 792        const char *interpr = parse_interpreter(cmd);
 793        char **path;
 794        char *prog;
 795        int pid = 0;
 796
 797        if (!interpr)
 798                return 0;
 799        path = get_path_split();
 800        prog = path_lookup(interpr, path, 1);
 801        if (prog) {
 802                int argc = 0;
 803                const char **argv2;
 804                while (argv[argc]) argc++;
 805                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 806                argv2[0] = (char *)cmd; /* full path to the script file */
 807                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 808                pid = mingw_spawnve(prog, argv2, env, 1);
 809                if (pid >= 0) {
 810                        int status;
 811                        if (waitpid(pid, &status, 0) < 0)
 812                                status = 255;
 813                        exit(status);
 814                }
 815                pid = 1;        /* indicate that we tried but failed */
 816                free(prog);
 817                free(argv2);
 818        }
 819        free_path_split(path);
 820        return pid;
 821}
 822
 823static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 824{
 825        /* check if git_command is a shell script */
 826        if (!try_shell_exec(cmd, argv, (char **)env)) {
 827                int pid, status;
 828
 829                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 830                if (pid < 0)
 831                        return;
 832                if (waitpid(pid, &status, 0) < 0)
 833                        status = 255;
 834                exit(status);
 835        }
 836}
 837
 838void mingw_execvp(const char *cmd, char *const *argv)
 839{
 840        char **path = get_path_split();
 841        char *prog = path_lookup(cmd, path, 0);
 842
 843        if (prog) {
 844                mingw_execve(prog, argv, environ);
 845                free(prog);
 846        } else
 847                errno = ENOENT;
 848
 849        free_path_split(path);
 850}
 851
 852static char **copy_environ(void)
 853{
 854        char **env;
 855        int i = 0;
 856        while (environ[i])
 857                i++;
 858        env = xmalloc((i+1)*sizeof(*env));
 859        for (i = 0; environ[i]; i++)
 860                env[i] = xstrdup(environ[i]);
 861        env[i] = NULL;
 862        return env;
 863}
 864
 865void free_environ(char **env)
 866{
 867        int i;
 868        for (i = 0; env[i]; i++)
 869                free(env[i]);
 870        free(env);
 871}
 872
 873static int lookup_env(char **env, const char *name, size_t nmln)
 874{
 875        int i;
 876
 877        for (i = 0; env[i]; i++) {
 878                if (0 == strncmp(env[i], name, nmln)
 879                    && '=' == env[i][nmln])
 880                        /* matches */
 881                        return i;
 882        }
 883        return -1;
 884}
 885
 886/*
 887 * If name contains '=', then sets the variable, otherwise it unsets it
 888 */
 889static char **env_setenv(char **env, const char *name)
 890{
 891        char *eq = strchrnul(name, '=');
 892        int i = lookup_env(env, name, eq-name);
 893
 894        if (i < 0) {
 895                if (*eq) {
 896                        for (i = 0; env[i]; i++)
 897                                ;
 898                        env = xrealloc(env, (i+2)*sizeof(*env));
 899                        env[i] = xstrdup(name);
 900                        env[i+1] = NULL;
 901                }
 902        }
 903        else {
 904                free(env[i]);
 905                if (*eq)
 906                        env[i] = xstrdup(name);
 907                else
 908                        for (; env[i]; i++)
 909                                env[i] = env[i+1];
 910        }
 911        return env;
 912}
 913
 914/*
 915 * Copies global environ and adjusts variables as specified by vars.
 916 */
 917char **make_augmented_environ(const char *const *vars)
 918{
 919        char **env = copy_environ();
 920
 921        while (*vars)
 922                env = env_setenv(env, *vars++);
 923        return env;
 924}
 925
 926/*
 927 * Note, this isn't a complete replacement for getaddrinfo. It assumes
 928 * that service contains a numerical port, or that it it is null. It
 929 * does a simple search using gethostbyname, and returns one IPv4 host
 930 * if one was found.
 931 */
 932static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
 933                                   const struct addrinfo *hints,
 934                                   struct addrinfo **res)
 935{
 936        struct hostent *h = gethostbyname(node);
 937        struct addrinfo *ai;
 938        struct sockaddr_in *sin;
 939
 940        if (!h)
 941                return WSAGetLastError();
 942
 943        ai = xmalloc(sizeof(struct addrinfo));
 944        *res = ai;
 945        ai->ai_flags = 0;
 946        ai->ai_family = AF_INET;
 947        ai->ai_socktype = hints->ai_socktype;
 948        switch (hints->ai_socktype) {
 949        case SOCK_STREAM:
 950                ai->ai_protocol = IPPROTO_TCP;
 951                break;
 952        case SOCK_DGRAM:
 953                ai->ai_protocol = IPPROTO_UDP;
 954                break;
 955        default:
 956                ai->ai_protocol = 0;
 957                break;
 958        }
 959        ai->ai_addrlen = sizeof(struct sockaddr_in);
 960        ai->ai_canonname = strdup(h->h_name);
 961
 962        sin = xmalloc(ai->ai_addrlen);
 963        memset(sin, 0, ai->ai_addrlen);
 964        sin->sin_family = AF_INET;
 965        if (service)
 966                sin->sin_port = htons(atoi(service));
 967        sin->sin_addr = *(struct in_addr *)h->h_addr;
 968        ai->ai_addr = (struct sockaddr *)sin;
 969        ai->ai_next = 0;
 970        return 0;
 971}
 972
 973static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
 974{
 975        free(res->ai_canonname);
 976        free(res->ai_addr);
 977        free(res);
 978}
 979
 980static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
 981                                   char *host, DWORD hostlen,
 982                                   char *serv, DWORD servlen, int flags)
 983{
 984        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 985        if (sa->sa_family != AF_INET)
 986                return EAI_FAMILY;
 987        if (!host && !serv)
 988                return EAI_NONAME;
 989
 990        if (host && hostlen > 0) {
 991                struct hostent *ent = NULL;
 992                if (!(flags & NI_NUMERICHOST))
 993                        ent = gethostbyaddr((const char *)&sin->sin_addr,
 994                                            sizeof(sin->sin_addr), AF_INET);
 995
 996                if (ent)
 997                        snprintf(host, hostlen, "%s", ent->h_name);
 998                else if (flags & NI_NAMEREQD)
 999                        return EAI_NONAME;
1000                else
1001                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1002        }
1003
1004        if (serv && servlen > 0) {
1005                struct servent *ent = NULL;
1006                if (!(flags & NI_NUMERICSERV))
1007                        ent = getservbyport(sin->sin_port,
1008                                            flags & NI_DGRAM ? "udp" : "tcp");
1009
1010                if (ent)
1011                        snprintf(serv, servlen, "%s", ent->s_name);
1012                else
1013                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1014        }
1015
1016        return 0;
1017}
1018
1019static HMODULE ipv6_dll = NULL;
1020static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1021static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1022                                      const struct addrinfo *hints,
1023                                      struct addrinfo **res);
1024static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1025                                      char *host, DWORD hostlen,
1026                                      char *serv, DWORD servlen, int flags);
1027/*
1028 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1029 * don't need to try to load that one dynamically.
1030 */
1031
1032static void socket_cleanup(void)
1033{
1034        WSACleanup();
1035        if (ipv6_dll)
1036                FreeLibrary(ipv6_dll);
1037        ipv6_dll = NULL;
1038        ipv6_freeaddrinfo = freeaddrinfo_stub;
1039        ipv6_getaddrinfo = getaddrinfo_stub;
1040        ipv6_getnameinfo = getnameinfo_stub;
1041}
1042
1043static void ensure_socket_initialization(void)
1044{
1045        WSADATA wsa;
1046        static int initialized = 0;
1047        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1048        const char **name;
1049
1050        if (initialized)
1051                return;
1052
1053        if (WSAStartup(MAKEWORD(2,2), &wsa))
1054                die("unable to initialize winsock subsystem, error %d",
1055                        WSAGetLastError());
1056
1057        for (name = libraries; *name; name++) {
1058                ipv6_dll = LoadLibrary(*name);
1059                if (!ipv6_dll)
1060                        continue;
1061
1062                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1063                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1064                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1065                                                   const struct addrinfo *,
1066                                                   struct addrinfo **))
1067                        GetProcAddress(ipv6_dll, "getaddrinfo");
1068                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1069                                                   socklen_t, char *, DWORD,
1070                                                   char *, DWORD, int))
1071                        GetProcAddress(ipv6_dll, "getnameinfo");
1072                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1073                        FreeLibrary(ipv6_dll);
1074                        ipv6_dll = NULL;
1075                } else
1076                        break;
1077        }
1078        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1079                ipv6_freeaddrinfo = freeaddrinfo_stub;
1080                ipv6_getaddrinfo = getaddrinfo_stub;
1081                ipv6_getnameinfo = getnameinfo_stub;
1082        }
1083
1084        atexit(socket_cleanup);
1085        initialized = 1;
1086}
1087
1088#undef gethostbyname
1089struct hostent *mingw_gethostbyname(const char *host)
1090{
1091        ensure_socket_initialization();
1092        return gethostbyname(host);
1093}
1094
1095void mingw_freeaddrinfo(struct addrinfo *res)
1096{
1097        ipv6_freeaddrinfo(res);
1098}
1099
1100int mingw_getaddrinfo(const char *node, const char *service,
1101                      const struct addrinfo *hints, struct addrinfo **res)
1102{
1103        ensure_socket_initialization();
1104        return ipv6_getaddrinfo(node, service, hints, res);
1105}
1106
1107int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1108                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1109                      int flags)
1110{
1111        ensure_socket_initialization();
1112        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1113}
1114
1115int mingw_socket(int domain, int type, int protocol)
1116{
1117        int sockfd;
1118        SOCKET s = WSASocket(domain, type, protocol, NULL, 0, 0);
1119        if (s == INVALID_SOCKET) {
1120                /*
1121                 * WSAGetLastError() values are regular BSD error codes
1122                 * biased by WSABASEERR.
1123                 * However, strerror() does not know about networking
1124                 * specific errors, which are values beginning at 38 or so.
1125                 * Therefore, we choose to leave the biased error code
1126                 * in errno so that _if_ someone looks up the code somewhere,
1127                 * then it is at least the number that are usually listed.
1128                 */
1129                errno = WSAGetLastError();
1130                return -1;
1131        }
1132        /* convert into a file descriptor */
1133        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1134                closesocket(s);
1135                return error("unable to make a socket file descriptor: %s",
1136                        strerror(errno));
1137        }
1138        return sockfd;
1139}
1140
1141#undef connect
1142int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1143{
1144        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1145        return connect(s, sa, sz);
1146}
1147
1148#undef rename
1149int mingw_rename(const char *pold, const char *pnew)
1150{
1151        DWORD attrs, gle;
1152        int tries = 0;
1153        static const int delay[] = { 0, 1, 10, 20, 40 };
1154
1155        /*
1156         * Try native rename() first to get errno right.
1157         * It is based on MoveFile(), which cannot overwrite existing files.
1158         */
1159        if (!rename(pold, pnew))
1160                return 0;
1161        if (errno != EEXIST)
1162                return -1;
1163repeat:
1164        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1165                return 0;
1166        /* TODO: translate more errors */
1167        gle = GetLastError();
1168        if (gle == ERROR_ACCESS_DENIED &&
1169            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1170                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1171                        errno = EISDIR;
1172                        return -1;
1173                }
1174                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1175                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1176                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1177                                return 0;
1178                        gle = GetLastError();
1179                        /* revert file attributes on failure */
1180                        SetFileAttributes(pnew, attrs);
1181                }
1182        }
1183        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1184                /*
1185                 * We assume that some other process had the source or
1186                 * destination file open at the wrong moment and retry.
1187                 * In order to give the other process a higher chance to
1188                 * complete its operation, we give up our time slice now.
1189                 * If we have to retry again, we do sleep a bit.
1190                 */
1191                Sleep(delay[tries]);
1192                tries++;
1193                goto repeat;
1194        }
1195        errno = EACCES;
1196        return -1;
1197}
1198
1199/*
1200 * Note that this doesn't return the actual pagesize, but
1201 * the allocation granularity. If future Windows specific git code
1202 * needs the real getpagesize function, we need to find another solution.
1203 */
1204int mingw_getpagesize(void)
1205{
1206        SYSTEM_INFO si;
1207        GetSystemInfo(&si);
1208        return si.dwAllocationGranularity;
1209}
1210
1211struct passwd *getpwuid(int uid)
1212{
1213        static char user_name[100];
1214        static struct passwd p;
1215
1216        DWORD len = sizeof(user_name);
1217        if (!GetUserName(user_name, &len))
1218                return NULL;
1219        p.pw_name = user_name;
1220        p.pw_gecos = "unknown";
1221        p.pw_dir = NULL;
1222        return &p;
1223}
1224
1225static HANDLE timer_event;
1226static HANDLE timer_thread;
1227static int timer_interval;
1228static int one_shot;
1229static sig_handler_t timer_fn = SIG_DFL;
1230
1231/* The timer works like this:
1232 * The thread, ticktack(), is a trivial routine that most of the time
1233 * only waits to receive the signal to terminate. The main thread tells
1234 * the thread to terminate by setting the timer_event to the signalled
1235 * state.
1236 * But ticktack() interrupts the wait state after the timer's interval
1237 * length to call the signal handler.
1238 */
1239
1240static unsigned __stdcall ticktack(void *dummy)
1241{
1242        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1243                if (timer_fn == SIG_DFL)
1244                        die("Alarm");
1245                if (timer_fn != SIG_IGN)
1246                        timer_fn(SIGALRM);
1247                if (one_shot)
1248                        break;
1249        }
1250        return 0;
1251}
1252
1253static int start_timer_thread(void)
1254{
1255        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1256        if (timer_event) {
1257                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1258                if (!timer_thread )
1259                        return errno = ENOMEM,
1260                                error("cannot start timer thread");
1261        } else
1262                return errno = ENOMEM,
1263                        error("cannot allocate resources for timer");
1264        return 0;
1265}
1266
1267static void stop_timer_thread(void)
1268{
1269        if (timer_event)
1270                SetEvent(timer_event);  /* tell thread to terminate */
1271        if (timer_thread) {
1272                int rc = WaitForSingleObject(timer_thread, 1000);
1273                if (rc == WAIT_TIMEOUT)
1274                        error("timer thread did not terminate timely");
1275                else if (rc != WAIT_OBJECT_0)
1276                        error("waiting for timer thread failed: %lu",
1277                              GetLastError());
1278                CloseHandle(timer_thread);
1279        }
1280        if (timer_event)
1281                CloseHandle(timer_event);
1282        timer_event = NULL;
1283        timer_thread = NULL;
1284}
1285
1286static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1287{
1288        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1289}
1290
1291int setitimer(int type, struct itimerval *in, struct itimerval *out)
1292{
1293        static const struct timeval zero;
1294        static int atexit_done;
1295
1296        if (out != NULL)
1297                return errno = EINVAL,
1298                        error("setitimer param 3 != NULL not implemented");
1299        if (!is_timeval_eq(&in->it_interval, &zero) &&
1300            !is_timeval_eq(&in->it_interval, &in->it_value))
1301                return errno = EINVAL,
1302                        error("setitimer: it_interval must be zero or eq it_value");
1303
1304        if (timer_thread)
1305                stop_timer_thread();
1306
1307        if (is_timeval_eq(&in->it_value, &zero) &&
1308            is_timeval_eq(&in->it_interval, &zero))
1309                return 0;
1310
1311        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1312        one_shot = is_timeval_eq(&in->it_interval, &zero);
1313        if (!atexit_done) {
1314                atexit(stop_timer_thread);
1315                atexit_done = 1;
1316        }
1317        return start_timer_thread();
1318}
1319
1320int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1321{
1322        if (sig != SIGALRM)
1323                return errno = EINVAL,
1324                        error("sigaction only implemented for SIGALRM");
1325        if (out != NULL)
1326                return errno = EINVAL,
1327                        error("sigaction: param 3 != NULL not implemented");
1328
1329        timer_fn = in->sa_handler;
1330        return 0;
1331}
1332
1333#undef signal
1334sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1335{
1336        sig_handler_t old = timer_fn;
1337        if (sig != SIGALRM)
1338                return signal(sig, handler);
1339        timer_fn = handler;
1340        return old;
1341}
1342
1343static const char *make_backslash_path(const char *path)
1344{
1345        static char buf[PATH_MAX + 1];
1346        char *c;
1347
1348        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1349                die("Too long path: %.*s", 60, path);
1350
1351        for (c = buf; *c; c++) {
1352                if (*c == '/')
1353                        *c = '\\';
1354        }
1355        return buf;
1356}
1357
1358void mingw_open_html(const char *unixpath)
1359{
1360        const char *htmlpath = make_backslash_path(unixpath);
1361        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1362                        const char *, const char *, const char *, INT);
1363        T ShellExecute;
1364        HMODULE shell32;
1365
1366        shell32 = LoadLibrary("shell32.dll");
1367        if (!shell32)
1368                die("cannot load shell32.dll");
1369        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1370        if (!ShellExecute)
1371                die("cannot run browser");
1372
1373        printf("Launching default browser to display HTML ...\n");
1374        ShellExecute(NULL, "open", htmlpath, NULL, "\\", 0);
1375
1376        FreeLibrary(shell32);
1377}
1378
1379int link(const char *oldpath, const char *newpath)
1380{
1381        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1382        static T create_hard_link = NULL;
1383        if (!create_hard_link) {
1384                create_hard_link = (T) GetProcAddress(
1385                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1386                if (!create_hard_link)
1387                        create_hard_link = (T)-1;
1388        }
1389        if (create_hard_link == (T)-1) {
1390                errno = ENOSYS;
1391                return -1;
1392        }
1393        if (!create_hard_link(newpath, oldpath, NULL)) {
1394                errno = err_win_to_posix(GetLastError());
1395                return -1;
1396        }
1397        return 0;
1398}
1399
1400char *getpass(const char *prompt)
1401{
1402        struct strbuf buf = STRBUF_INIT;
1403
1404        fputs(prompt, stderr);
1405        for (;;) {
1406                char c = _getch();
1407                if (c == '\r' || c == '\n')
1408                        break;
1409                strbuf_addch(&buf, c);
1410        }
1411        fputs("\n", stderr);
1412        return strbuf_detach(&buf, NULL);
1413}
1414
1415#ifndef NO_MINGW_REPLACE_READDIR
1416/* MinGW readdir implementation to avoid extra lstats for Git */
1417struct mingw_DIR
1418{
1419        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1420        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1421        long                    dd_handle;      /* _findnext handle */
1422        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1423        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1424};
1425
1426struct dirent *mingw_readdir(DIR *dir)
1427{
1428        WIN32_FIND_DATAA buf;
1429        HANDLE handle;
1430        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1431
1432        if (!dir->dd_handle) {
1433                errno = EBADF; /* No set_errno for mingw */
1434                return NULL;
1435        }
1436
1437        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1438        {
1439                DWORD lasterr;
1440                handle = FindFirstFileA(dir->dd_name, &buf);
1441                lasterr = GetLastError();
1442                dir->dd_handle = (long)handle;
1443                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1444                        errno = err_win_to_posix(lasterr);
1445                        return NULL;
1446                }
1447        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1448                return NULL;
1449        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1450                DWORD lasterr = GetLastError();
1451                FindClose((HANDLE)dir->dd_handle);
1452                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1453                /* POSIX says you shouldn't set errno when readdir can't
1454                   find any more files; so, if another error we leave it set. */
1455                if (lasterr != ERROR_NO_MORE_FILES)
1456                        errno = err_win_to_posix(lasterr);
1457                return NULL;
1458        }
1459
1460        /* We get here if `buf' contains valid data.  */
1461        strcpy(dir->dd_dir.d_name, buf.cFileName);
1462        ++dir->dd_stat;
1463
1464        /* Set file type, based on WIN32_FIND_DATA */
1465        mdir->dd_dir.d_type = 0;
1466        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1467                mdir->dd_dir.d_type |= DT_DIR;
1468        else
1469                mdir->dd_dir.d_type |= DT_REG;
1470
1471        return (struct dirent*)&dir->dd_dir;
1472}
1473#endif // !NO_MINGW_REPLACE_READDIR