a6c1ee702a54fdbcaab7af031a4e7a3e7ea2c1ce
   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 (filename && !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 (filename && !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 *
 196 * If follow is true then act like stat() and report on the link
 197 * target. Otherwise report on the link itself.
 198 */
 199static int do_lstat(int follow, const char *file_name, struct stat *buf)
 200{
 201        WIN32_FILE_ATTRIBUTE_DATA fdata;
 202
 203        if (!(errno = get_file_attr(file_name, &fdata))) {
 204                buf->st_ino = 0;
 205                buf->st_gid = 0;
 206                buf->st_uid = 0;
 207                buf->st_nlink = 1;
 208                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 209                buf->st_size = fdata.nFileSizeLow |
 210                        (((off_t)fdata.nFileSizeHigh)<<32);
 211                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 212                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 213                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 214                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 215                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 216                        WIN32_FIND_DATAA findbuf;
 217                        HANDLE handle = FindFirstFileA(file_name, &findbuf);
 218                        if (handle != INVALID_HANDLE_VALUE) {
 219                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 220                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 221                                        if (follow) {
 222                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 223                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 224                                        } else {
 225                                                buf->st_mode = S_IFLNK;
 226                                        }
 227                                        buf->st_mode |= S_IREAD;
 228                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 229                                                buf->st_mode |= S_IWRITE;
 230                                }
 231                                FindClose(handle);
 232                        }
 233                }
 234                return 0;
 235        }
 236        return -1;
 237}
 238
 239/* We provide our own lstat/fstat functions, since the provided
 240 * lstat/fstat functions are so slow. These stat functions are
 241 * tailored for Git's usage (read: fast), and are not meant to be
 242 * complete. Note that Git stat()s are redirected to mingw_lstat()
 243 * too, since Windows doesn't really handle symlinks that well.
 244 */
 245static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 246{
 247        int namelen;
 248        static char alt_name[PATH_MAX];
 249
 250        if (!do_lstat(follow, file_name, buf))
 251                return 0;
 252
 253        /* if file_name ended in a '/', Windows returned ENOENT;
 254         * try again without trailing slashes
 255         */
 256        if (errno != ENOENT)
 257                return -1;
 258
 259        namelen = strlen(file_name);
 260        if (namelen && file_name[namelen-1] != '/')
 261                return -1;
 262        while (namelen && file_name[namelen-1] == '/')
 263                --namelen;
 264        if (!namelen || namelen >= PATH_MAX)
 265                return -1;
 266
 267        memcpy(alt_name, file_name, namelen);
 268        alt_name[namelen] = 0;
 269        return do_lstat(follow, alt_name, buf);
 270}
 271
 272int mingw_lstat(const char *file_name, struct stat *buf)
 273{
 274        return do_stat_internal(0, file_name, buf);
 275}
 276int mingw_stat(const char *file_name, struct stat *buf)
 277{
 278        return do_stat_internal(1, file_name, buf);
 279}
 280
 281#undef fstat
 282int mingw_fstat(int fd, struct stat *buf)
 283{
 284        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 285        BY_HANDLE_FILE_INFORMATION fdata;
 286
 287        if (fh == INVALID_HANDLE_VALUE) {
 288                errno = EBADF;
 289                return -1;
 290        }
 291        /* direct non-file handles to MS's fstat() */
 292        if (GetFileType(fh) != FILE_TYPE_DISK)
 293                return _fstati64(fd, buf);
 294
 295        if (GetFileInformationByHandle(fh, &fdata)) {
 296                buf->st_ino = 0;
 297                buf->st_gid = 0;
 298                buf->st_uid = 0;
 299                buf->st_nlink = 1;
 300                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 301                buf->st_size = fdata.nFileSizeLow |
 302                        (((off_t)fdata.nFileSizeHigh)<<32);
 303                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 304                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 305                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 306                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 307                return 0;
 308        }
 309        errno = EBADF;
 310        return -1;
 311}
 312
 313static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 314{
 315        long long winTime = t * 10000000LL + 116444736000000000LL;
 316        ft->dwLowDateTime = winTime;
 317        ft->dwHighDateTime = winTime >> 32;
 318}
 319
 320int mingw_utime (const char *file_name, const struct utimbuf *times)
 321{
 322        FILETIME mft, aft;
 323        int fh, rc;
 324
 325        /* must have write permission */
 326        DWORD attrs = GetFileAttributes(file_name);
 327        if (attrs != INVALID_FILE_ATTRIBUTES &&
 328            (attrs & FILE_ATTRIBUTE_READONLY)) {
 329                /* ignore errors here; open() will report them */
 330                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 331        }
 332
 333        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 334                rc = -1;
 335                goto revert_attrs;
 336        }
 337
 338        if (times) {
 339                time_t_to_filetime(times->modtime, &mft);
 340                time_t_to_filetime(times->actime, &aft);
 341        } else {
 342                GetSystemTimeAsFileTime(&mft);
 343                aft = mft;
 344        }
 345        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 346                errno = EINVAL;
 347                rc = -1;
 348        } else
 349                rc = 0;
 350        close(fh);
 351
 352revert_attrs:
 353        if (attrs != INVALID_FILE_ATTRIBUTES &&
 354            (attrs & FILE_ATTRIBUTE_READONLY)) {
 355                /* ignore errors again */
 356                SetFileAttributes(file_name, attrs);
 357        }
 358        return rc;
 359}
 360
 361unsigned int sleep (unsigned int seconds)
 362{
 363        Sleep(seconds*1000);
 364        return 0;
 365}
 366
 367int mkstemp(char *template)
 368{
 369        char *filename = mktemp(template);
 370        if (filename == NULL)
 371                return -1;
 372        return open(filename, O_RDWR | O_CREAT, 0600);
 373}
 374
 375int gettimeofday(struct timeval *tv, void *tz)
 376{
 377        FILETIME ft;
 378        long long hnsec;
 379
 380        GetSystemTimeAsFileTime(&ft);
 381        hnsec = filetime_to_hnsec(&ft);
 382        tv->tv_sec = hnsec / 10000000;
 383        tv->tv_usec = (hnsec % 10000000) / 10;
 384        return 0;
 385}
 386
 387int pipe(int filedes[2])
 388{
 389        HANDLE h[2];
 390
 391        /* this creates non-inheritable handles */
 392        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 393                errno = err_win_to_posix(GetLastError());
 394                return -1;
 395        }
 396        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 397        if (filedes[0] < 0) {
 398                CloseHandle(h[0]);
 399                CloseHandle(h[1]);
 400                return -1;
 401        }
 402        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 403        if (filedes[0] < 0) {
 404                close(filedes[0]);
 405                CloseHandle(h[1]);
 406                return -1;
 407        }
 408        return 0;
 409}
 410
 411int poll(struct pollfd *ufds, unsigned int nfds, int timeout)
 412{
 413        int i, pending;
 414
 415        if (timeout >= 0) {
 416                if (nfds == 0) {
 417                        Sleep(timeout);
 418                        return 0;
 419                }
 420                return errno = EINVAL, error("poll timeout not supported");
 421        }
 422
 423        /* When there is only one fd to wait for, then we pretend that
 424         * input is available and let the actual wait happen when the
 425         * caller invokes read().
 426         */
 427        if (nfds == 1) {
 428                if (!(ufds[0].events & POLLIN))
 429                        return errno = EINVAL, error("POLLIN not set");
 430                ufds[0].revents = POLLIN;
 431                return 0;
 432        }
 433
 434repeat:
 435        pending = 0;
 436        for (i = 0; i < nfds; i++) {
 437                DWORD avail = 0;
 438                HANDLE h = (HANDLE) _get_osfhandle(ufds[i].fd);
 439                if (h == INVALID_HANDLE_VALUE)
 440                        return -1;      /* errno was set */
 441
 442                if (!(ufds[i].events & POLLIN))
 443                        return errno = EINVAL, error("POLLIN not set");
 444
 445                /* this emulation works only for pipes */
 446                if (!PeekNamedPipe(h, NULL, 0, NULL, &avail, NULL)) {
 447                        int err = GetLastError();
 448                        if (err == ERROR_BROKEN_PIPE) {
 449                                ufds[i].revents = POLLHUP;
 450                                pending++;
 451                        } else {
 452                                errno = EINVAL;
 453                                return error("PeekNamedPipe failed,"
 454                                        " GetLastError: %u", err);
 455                        }
 456                } else if (avail) {
 457                        ufds[i].revents = POLLIN;
 458                        pending++;
 459                } else
 460                        ufds[i].revents = 0;
 461        }
 462        if (!pending) {
 463                /* The only times that we spin here is when the process
 464                 * that is connected through the pipes is waiting for
 465                 * its own input data to become available. But since
 466                 * the process (pack-objects) is itself CPU intensive,
 467                 * it will happily pick up the time slice that we are
 468                 * relinquishing here.
 469                 */
 470                Sleep(0);
 471                goto repeat;
 472        }
 473        return 0;
 474}
 475
 476struct tm *gmtime_r(const time_t *timep, struct tm *result)
 477{
 478        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 479        memcpy(result, gmtime(timep), sizeof(struct tm));
 480        return result;
 481}
 482
 483struct tm *localtime_r(const time_t *timep, struct tm *result)
 484{
 485        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 486        memcpy(result, localtime(timep), sizeof(struct tm));
 487        return result;
 488}
 489
 490#undef getcwd
 491char *mingw_getcwd(char *pointer, int len)
 492{
 493        int i;
 494        char *ret = getcwd(pointer, len);
 495        if (!ret)
 496                return ret;
 497        for (i = 0; pointer[i]; i++)
 498                if (pointer[i] == '\\')
 499                        pointer[i] = '/';
 500        return ret;
 501}
 502
 503#undef getenv
 504char *mingw_getenv(const char *name)
 505{
 506        char *result = getenv(name);
 507        if (!result && !strcmp(name, "TMPDIR")) {
 508                /* on Windows it is TMP and TEMP */
 509                result = getenv("TMP");
 510                if (!result)
 511                        result = getenv("TEMP");
 512        }
 513        return result;
 514}
 515
 516/*
 517 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 518 * (Parsing C++ Command-Line Arguments)
 519 */
 520static const char *quote_arg(const char *arg)
 521{
 522        /* count chars to quote */
 523        int len = 0, n = 0;
 524        int force_quotes = 0;
 525        char *q, *d;
 526        const char *p = arg;
 527        if (!*p) force_quotes = 1;
 528        while (*p) {
 529                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 530                        force_quotes = 1;
 531                else if (*p == '"')
 532                        n++;
 533                else if (*p == '\\') {
 534                        int count = 0;
 535                        while (*p == '\\') {
 536                                count++;
 537                                p++;
 538                                len++;
 539                        }
 540                        if (*p == '"')
 541                                n += count*2 + 1;
 542                        continue;
 543                }
 544                len++;
 545                p++;
 546        }
 547        if (!force_quotes && n == 0)
 548                return arg;
 549
 550        /* insert \ where necessary */
 551        d = q = xmalloc(len+n+3);
 552        *d++ = '"';
 553        while (*arg) {
 554                if (*arg == '"')
 555                        *d++ = '\\';
 556                else if (*arg == '\\') {
 557                        int count = 0;
 558                        while (*arg == '\\') {
 559                                count++;
 560                                *d++ = *arg++;
 561                        }
 562                        if (*arg == '"') {
 563                                while (count-- > 0)
 564                                        *d++ = '\\';
 565                                *d++ = '\\';
 566                        }
 567                }
 568                *d++ = *arg++;
 569        }
 570        *d++ = '"';
 571        *d++ = 0;
 572        return q;
 573}
 574
 575static const char *parse_interpreter(const char *cmd)
 576{
 577        static char buf[100];
 578        char *p, *opt;
 579        int n, fd;
 580
 581        /* don't even try a .exe */
 582        n = strlen(cmd);
 583        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 584                return NULL;
 585
 586        fd = open(cmd, O_RDONLY);
 587        if (fd < 0)
 588                return NULL;
 589        n = read(fd, buf, sizeof(buf)-1);
 590        close(fd);
 591        if (n < 4)      /* at least '#!/x' and not error */
 592                return NULL;
 593
 594        if (buf[0] != '#' || buf[1] != '!')
 595                return NULL;
 596        buf[n] = '\0';
 597        p = buf + strcspn(buf, "\r\n");
 598        if (!*p)
 599                return NULL;
 600
 601        *p = '\0';
 602        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 603                return NULL;
 604        /* strip options */
 605        if ((opt = strchr(p+1, ' ')))
 606                *opt = '\0';
 607        return p+1;
 608}
 609
 610/*
 611 * Splits the PATH into parts.
 612 */
 613static char **get_path_split(void)
 614{
 615        char *p, **path, *envpath = getenv("PATH");
 616        int i, n = 0;
 617
 618        if (!envpath || !*envpath)
 619                return NULL;
 620
 621        envpath = xstrdup(envpath);
 622        p = envpath;
 623        while (p) {
 624                char *dir = p;
 625                p = strchr(p, ';');
 626                if (p) *p++ = '\0';
 627                if (*dir) {     /* not earlier, catches series of ; */
 628                        ++n;
 629                }
 630        }
 631        if (!n)
 632                return NULL;
 633
 634        path = xmalloc((n+1)*sizeof(char *));
 635        p = envpath;
 636        i = 0;
 637        do {
 638                if (*p)
 639                        path[i++] = xstrdup(p);
 640                p = p+strlen(p)+1;
 641        } while (i < n);
 642        path[i] = NULL;
 643
 644        free(envpath);
 645
 646        return path;
 647}
 648
 649static void free_path_split(char **path)
 650{
 651        char **p = path;
 652
 653        if (!path)
 654                return;
 655
 656        while (*p)
 657                free(*p++);
 658        free(path);
 659}
 660
 661/*
 662 * exe_only means that we only want to detect .exe files, but not scripts
 663 * (which do not have an extension)
 664 */
 665static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 666{
 667        char path[MAX_PATH];
 668        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 669
 670        if (!isexe && access(path, F_OK) == 0)
 671                return xstrdup(path);
 672        path[strlen(path)-4] = '\0';
 673        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 674                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 675                        return xstrdup(path);
 676        return NULL;
 677}
 678
 679/*
 680 * Determines the absolute path of cmd using the split path in path.
 681 * If cmd contains a slash or backslash, no lookup is performed.
 682 */
 683static char *path_lookup(const char *cmd, char **path, int exe_only)
 684{
 685        char *prog = NULL;
 686        int len = strlen(cmd);
 687        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 688
 689        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 690                prog = xstrdup(cmd);
 691
 692        while (!prog && *path)
 693                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 694
 695        return prog;
 696}
 697
 698static int env_compare(const void *a, const void *b)
 699{
 700        char *const *ea = a;
 701        char *const *eb = b;
 702        return strcasecmp(*ea, *eb);
 703}
 704
 705struct pinfo_t {
 706        struct pinfo_t *next;
 707        pid_t pid;
 708        HANDLE proc;
 709} pinfo_t;
 710struct pinfo_t *pinfo = NULL;
 711CRITICAL_SECTION pinfo_cs;
 712
 713static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 714                              const char *dir,
 715                              int prepend_cmd, int fhin, int fhout, int fherr)
 716{
 717        STARTUPINFO si;
 718        PROCESS_INFORMATION pi;
 719        struct strbuf envblk, args;
 720        unsigned flags;
 721        BOOL ret;
 722
 723        /* Determine whether or not we are associated to a console */
 724        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 725                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 726                        FILE_ATTRIBUTE_NORMAL, NULL);
 727        if (cons == INVALID_HANDLE_VALUE) {
 728                /* There is no console associated with this process.
 729                 * Since the child is a console process, Windows
 730                 * would normally create a console window. But
 731                 * since we'll be redirecting std streams, we do
 732                 * not need the console.
 733                 * It is necessary to use DETACHED_PROCESS
 734                 * instead of CREATE_NO_WINDOW to make ssh
 735                 * recognize that it has no console.
 736                 */
 737                flags = DETACHED_PROCESS;
 738        } else {
 739                /* There is already a console. If we specified
 740                 * DETACHED_PROCESS here, too, Windows would
 741                 * disassociate the child from the console.
 742                 * The same is true for CREATE_NO_WINDOW.
 743                 * Go figure!
 744                 */
 745                flags = 0;
 746                CloseHandle(cons);
 747        }
 748        memset(&si, 0, sizeof(si));
 749        si.cb = sizeof(si);
 750        si.dwFlags = STARTF_USESTDHANDLES;
 751        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 752        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 753        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 754
 755        /* concatenate argv, quoting args as we go */
 756        strbuf_init(&args, 0);
 757        if (prepend_cmd) {
 758                char *quoted = (char *)quote_arg(cmd);
 759                strbuf_addstr(&args, quoted);
 760                if (quoted != cmd)
 761                        free(quoted);
 762        }
 763        for (; *argv; argv++) {
 764                char *quoted = (char *)quote_arg(*argv);
 765                if (*args.buf)
 766                        strbuf_addch(&args, ' ');
 767                strbuf_addstr(&args, quoted);
 768                if (quoted != *argv)
 769                        free(quoted);
 770        }
 771
 772        if (env) {
 773                int count = 0;
 774                char **e, **sorted_env;
 775
 776                for (e = env; *e; e++)
 777                        count++;
 778
 779                /* environment must be sorted */
 780                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 781                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 782                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 783
 784                strbuf_init(&envblk, 0);
 785                for (e = sorted_env; *e; e++) {
 786                        strbuf_addstr(&envblk, *e);
 787                        strbuf_addch(&envblk, '\0');
 788                }
 789                free(sorted_env);
 790        }
 791
 792        memset(&pi, 0, sizeof(pi));
 793        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 794                env ? envblk.buf : NULL, dir, &si, &pi);
 795
 796        if (env)
 797                strbuf_release(&envblk);
 798        strbuf_release(&args);
 799
 800        if (!ret) {
 801                errno = ENOENT;
 802                return -1;
 803        }
 804        CloseHandle(pi.hThread);
 805
 806        /*
 807         * The process ID is the human-readable identifier of the process
 808         * that we want to present in log and error messages. The handle
 809         * is not useful for this purpose. But we cannot close it, either,
 810         * because it is not possible to turn a process ID into a process
 811         * handle after the process terminated.
 812         * Keep the handle in a list for waitpid.
 813         */
 814        EnterCriticalSection(&pinfo_cs);
 815        {
 816                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 817                info->pid = pi.dwProcessId;
 818                info->proc = pi.hProcess;
 819                info->next = pinfo;
 820                pinfo = info;
 821        }
 822        LeaveCriticalSection(&pinfo_cs);
 823
 824        return (pid_t)pi.dwProcessId;
 825}
 826
 827static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 828                           int prepend_cmd)
 829{
 830        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 831}
 832
 833pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 834                     const char *dir,
 835                     int fhin, int fhout, int fherr)
 836{
 837        pid_t pid;
 838        char **path = get_path_split();
 839        char *prog = path_lookup(cmd, path, 0);
 840
 841        if (!prog) {
 842                errno = ENOENT;
 843                pid = -1;
 844        }
 845        else {
 846                const char *interpr = parse_interpreter(prog);
 847
 848                if (interpr) {
 849                        const char *argv0 = argv[0];
 850                        char *iprog = path_lookup(interpr, path, 1);
 851                        argv[0] = prog;
 852                        if (!iprog) {
 853                                errno = ENOENT;
 854                                pid = -1;
 855                        }
 856                        else {
 857                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 858                                                       fhin, fhout, fherr);
 859                                free(iprog);
 860                        }
 861                        argv[0] = argv0;
 862                }
 863                else
 864                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 865                                               fhin, fhout, fherr);
 866                free(prog);
 867        }
 868        free_path_split(path);
 869        return pid;
 870}
 871
 872static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 873{
 874        const char *interpr = parse_interpreter(cmd);
 875        char **path;
 876        char *prog;
 877        int pid = 0;
 878
 879        if (!interpr)
 880                return 0;
 881        path = get_path_split();
 882        prog = path_lookup(interpr, path, 1);
 883        if (prog) {
 884                int argc = 0;
 885                const char **argv2;
 886                while (argv[argc]) argc++;
 887                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 888                argv2[0] = (char *)cmd; /* full path to the script file */
 889                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 890                pid = mingw_spawnve(prog, argv2, env, 1);
 891                if (pid >= 0) {
 892                        int status;
 893                        if (waitpid(pid, &status, 0) < 0)
 894                                status = 255;
 895                        exit(status);
 896                }
 897                pid = 1;        /* indicate that we tried but failed */
 898                free(prog);
 899                free(argv2);
 900        }
 901        free_path_split(path);
 902        return pid;
 903}
 904
 905static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 906{
 907        /* check if git_command is a shell script */
 908        if (!try_shell_exec(cmd, argv, (char **)env)) {
 909                int pid, status;
 910
 911                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 912                if (pid < 0)
 913                        return;
 914                if (waitpid(pid, &status, 0) < 0)
 915                        status = 255;
 916                exit(status);
 917        }
 918}
 919
 920void mingw_execvp(const char *cmd, char *const *argv)
 921{
 922        char **path = get_path_split();
 923        char *prog = path_lookup(cmd, path, 0);
 924
 925        if (prog) {
 926                mingw_execve(prog, argv, environ);
 927                free(prog);
 928        } else
 929                errno = ENOENT;
 930
 931        free_path_split(path);
 932}
 933
 934void mingw_execv(const char *cmd, char *const *argv)
 935{
 936        mingw_execve(cmd, argv, environ);
 937}
 938
 939int mingw_kill(pid_t pid, int sig)
 940{
 941        if (pid > 0 && sig == SIGTERM) {
 942                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
 943
 944                if (TerminateProcess(h, -1)) {
 945                        CloseHandle(h);
 946                        return 0;
 947                }
 948
 949                errno = err_win_to_posix(GetLastError());
 950                CloseHandle(h);
 951                return -1;
 952        }
 953
 954        errno = EINVAL;
 955        return -1;
 956}
 957
 958static char **copy_environ(void)
 959{
 960        char **env;
 961        int i = 0;
 962        while (environ[i])
 963                i++;
 964        env = xmalloc((i+1)*sizeof(*env));
 965        for (i = 0; environ[i]; i++)
 966                env[i] = xstrdup(environ[i]);
 967        env[i] = NULL;
 968        return env;
 969}
 970
 971void free_environ(char **env)
 972{
 973        int i;
 974        for (i = 0; env[i]; i++)
 975                free(env[i]);
 976        free(env);
 977}
 978
 979static int lookup_env(char **env, const char *name, size_t nmln)
 980{
 981        int i;
 982
 983        for (i = 0; env[i]; i++) {
 984                if (0 == strncmp(env[i], name, nmln)
 985                    && '=' == env[i][nmln])
 986                        /* matches */
 987                        return i;
 988        }
 989        return -1;
 990}
 991
 992/*
 993 * If name contains '=', then sets the variable, otherwise it unsets it
 994 */
 995static char **env_setenv(char **env, const char *name)
 996{
 997        char *eq = strchrnul(name, '=');
 998        int i = lookup_env(env, name, eq-name);
 999
1000        if (i < 0) {
1001                if (*eq) {
1002                        for (i = 0; env[i]; i++)
1003                                ;
1004                        env = xrealloc(env, (i+2)*sizeof(*env));
1005                        env[i] = xstrdup(name);
1006                        env[i+1] = NULL;
1007                }
1008        }
1009        else {
1010                free(env[i]);
1011                if (*eq)
1012                        env[i] = xstrdup(name);
1013                else
1014                        for (; env[i]; i++)
1015                                env[i] = env[i+1];
1016        }
1017        return env;
1018}
1019
1020/*
1021 * Copies global environ and adjusts variables as specified by vars.
1022 */
1023char **make_augmented_environ(const char *const *vars)
1024{
1025        char **env = copy_environ();
1026
1027        while (*vars)
1028                env = env_setenv(env, *vars++);
1029        return env;
1030}
1031
1032/*
1033 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1034 * that service contains a numerical port, or that it it is null. It
1035 * does a simple search using gethostbyname, and returns one IPv4 host
1036 * if one was found.
1037 */
1038static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1039                                   const struct addrinfo *hints,
1040                                   struct addrinfo **res)
1041{
1042        struct hostent *h = NULL;
1043        struct addrinfo *ai;
1044        struct sockaddr_in *sin;
1045
1046        if (node) {
1047                h = gethostbyname(node);
1048                if (!h)
1049                        return WSAGetLastError();
1050        }
1051
1052        ai = xmalloc(sizeof(struct addrinfo));
1053        *res = ai;
1054        ai->ai_flags = 0;
1055        ai->ai_family = AF_INET;
1056        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1057        switch (ai->ai_socktype) {
1058        case SOCK_STREAM:
1059                ai->ai_protocol = IPPROTO_TCP;
1060                break;
1061        case SOCK_DGRAM:
1062                ai->ai_protocol = IPPROTO_UDP;
1063                break;
1064        default:
1065                ai->ai_protocol = 0;
1066                break;
1067        }
1068        ai->ai_addrlen = sizeof(struct sockaddr_in);
1069        if (hints && (hints->ai_flags & AI_CANONNAME))
1070                ai->ai_canonname = h ? strdup(h->h_name) : NULL;
1071        else
1072                ai->ai_canonname = NULL;
1073
1074        sin = xmalloc(ai->ai_addrlen);
1075        memset(sin, 0, ai->ai_addrlen);
1076        sin->sin_family = AF_INET;
1077        /* Note: getaddrinfo is supposed to allow service to be a string,
1078         * which should be looked up using getservbyname. This is
1079         * currently not implemented */
1080        if (service)
1081                sin->sin_port = htons(atoi(service));
1082        if (h)
1083                sin->sin_addr = *(struct in_addr *)h->h_addr;
1084        else if (hints && (hints->ai_flags & AI_PASSIVE))
1085                sin->sin_addr.s_addr = INADDR_ANY;
1086        else
1087                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1088        ai->ai_addr = (struct sockaddr *)sin;
1089        ai->ai_next = 0;
1090        return 0;
1091}
1092
1093static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1094{
1095        free(res->ai_canonname);
1096        free(res->ai_addr);
1097        free(res);
1098}
1099
1100static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1101                                   char *host, DWORD hostlen,
1102                                   char *serv, DWORD servlen, int flags)
1103{
1104        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1105        if (sa->sa_family != AF_INET)
1106                return EAI_FAMILY;
1107        if (!host && !serv)
1108                return EAI_NONAME;
1109
1110        if (host && hostlen > 0) {
1111                struct hostent *ent = NULL;
1112                if (!(flags & NI_NUMERICHOST))
1113                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1114                                            sizeof(sin->sin_addr), AF_INET);
1115
1116                if (ent)
1117                        snprintf(host, hostlen, "%s", ent->h_name);
1118                else if (flags & NI_NAMEREQD)
1119                        return EAI_NONAME;
1120                else
1121                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1122        }
1123
1124        if (serv && servlen > 0) {
1125                struct servent *ent = NULL;
1126                if (!(flags & NI_NUMERICSERV))
1127                        ent = getservbyport(sin->sin_port,
1128                                            flags & NI_DGRAM ? "udp" : "tcp");
1129
1130                if (ent)
1131                        snprintf(serv, servlen, "%s", ent->s_name);
1132                else
1133                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1134        }
1135
1136        return 0;
1137}
1138
1139static HMODULE ipv6_dll = NULL;
1140static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1141static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1142                                      const struct addrinfo *hints,
1143                                      struct addrinfo **res);
1144static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1145                                      char *host, DWORD hostlen,
1146                                      char *serv, DWORD servlen, int flags);
1147/*
1148 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1149 * don't need to try to load that one dynamically.
1150 */
1151
1152static void socket_cleanup(void)
1153{
1154        WSACleanup();
1155        if (ipv6_dll)
1156                FreeLibrary(ipv6_dll);
1157        ipv6_dll = NULL;
1158        ipv6_freeaddrinfo = freeaddrinfo_stub;
1159        ipv6_getaddrinfo = getaddrinfo_stub;
1160        ipv6_getnameinfo = getnameinfo_stub;
1161}
1162
1163static void ensure_socket_initialization(void)
1164{
1165        WSADATA wsa;
1166        static int initialized = 0;
1167        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1168        const char **name;
1169
1170        if (initialized)
1171                return;
1172
1173        if (WSAStartup(MAKEWORD(2,2), &wsa))
1174                die("unable to initialize winsock subsystem, error %d",
1175                        WSAGetLastError());
1176
1177        for (name = libraries; *name; name++) {
1178                ipv6_dll = LoadLibrary(*name);
1179                if (!ipv6_dll)
1180                        continue;
1181
1182                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1183                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1184                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1185                                                   const struct addrinfo *,
1186                                                   struct addrinfo **))
1187                        GetProcAddress(ipv6_dll, "getaddrinfo");
1188                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1189                                                   socklen_t, char *, DWORD,
1190                                                   char *, DWORD, int))
1191                        GetProcAddress(ipv6_dll, "getnameinfo");
1192                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1193                        FreeLibrary(ipv6_dll);
1194                        ipv6_dll = NULL;
1195                } else
1196                        break;
1197        }
1198        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1199                ipv6_freeaddrinfo = freeaddrinfo_stub;
1200                ipv6_getaddrinfo = getaddrinfo_stub;
1201                ipv6_getnameinfo = getnameinfo_stub;
1202        }
1203
1204        atexit(socket_cleanup);
1205        initialized = 1;
1206}
1207
1208#undef gethostbyname
1209struct hostent *mingw_gethostbyname(const char *host)
1210{
1211        ensure_socket_initialization();
1212        return gethostbyname(host);
1213}
1214
1215void mingw_freeaddrinfo(struct addrinfo *res)
1216{
1217        ipv6_freeaddrinfo(res);
1218}
1219
1220int mingw_getaddrinfo(const char *node, const char *service,
1221                      const struct addrinfo *hints, struct addrinfo **res)
1222{
1223        ensure_socket_initialization();
1224        return ipv6_getaddrinfo(node, service, hints, res);
1225}
1226
1227int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1228                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1229                      int flags)
1230{
1231        ensure_socket_initialization();
1232        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1233}
1234
1235int mingw_socket(int domain, int type, int protocol)
1236{
1237        int sockfd;
1238        SOCKET s;
1239
1240        ensure_socket_initialization();
1241        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1242        if (s == INVALID_SOCKET) {
1243                /*
1244                 * WSAGetLastError() values are regular BSD error codes
1245                 * biased by WSABASEERR.
1246                 * However, strerror() does not know about networking
1247                 * specific errors, which are values beginning at 38 or so.
1248                 * Therefore, we choose to leave the biased error code
1249                 * in errno so that _if_ someone looks up the code somewhere,
1250                 * then it is at least the number that are usually listed.
1251                 */
1252                errno = WSAGetLastError();
1253                return -1;
1254        }
1255        /* convert into a file descriptor */
1256        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1257                closesocket(s);
1258                return error("unable to make a socket file descriptor: %s",
1259                        strerror(errno));
1260        }
1261        return sockfd;
1262}
1263
1264#undef connect
1265int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1266{
1267        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1268        return connect(s, sa, sz);
1269}
1270
1271#undef bind
1272int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1273{
1274        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1275        return bind(s, sa, sz);
1276}
1277
1278#undef setsockopt
1279int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1280{
1281        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1282        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1283}
1284
1285#undef listen
1286int mingw_listen(int sockfd, int backlog)
1287{
1288        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1289        return listen(s, backlog);
1290}
1291
1292#undef accept
1293int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1294{
1295        int sockfd2;
1296
1297        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1298        SOCKET s2 = accept(s1, sa, sz);
1299
1300        /* convert into a file descriptor */
1301        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1302                int err = errno;
1303                closesocket(s2);
1304                return error("unable to make a socket file descriptor: %s",
1305                        strerror(err));
1306        }
1307        return sockfd2;
1308}
1309
1310#undef rename
1311int mingw_rename(const char *pold, const char *pnew)
1312{
1313        DWORD attrs, gle;
1314        int tries = 0;
1315        static const int delay[] = { 0, 1, 10, 20, 40 };
1316
1317        /*
1318         * Try native rename() first to get errno right.
1319         * It is based on MoveFile(), which cannot overwrite existing files.
1320         */
1321        if (!rename(pold, pnew))
1322                return 0;
1323        if (errno != EEXIST)
1324                return -1;
1325repeat:
1326        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1327                return 0;
1328        /* TODO: translate more errors */
1329        gle = GetLastError();
1330        if (gle == ERROR_ACCESS_DENIED &&
1331            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1332                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1333                        errno = EISDIR;
1334                        return -1;
1335                }
1336                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1337                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1338                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1339                                return 0;
1340                        gle = GetLastError();
1341                        /* revert file attributes on failure */
1342                        SetFileAttributes(pnew, attrs);
1343                }
1344        }
1345        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1346                /*
1347                 * We assume that some other process had the source or
1348                 * destination file open at the wrong moment and retry.
1349                 * In order to give the other process a higher chance to
1350                 * complete its operation, we give up our time slice now.
1351                 * If we have to retry again, we do sleep a bit.
1352                 */
1353                Sleep(delay[tries]);
1354                tries++;
1355                goto repeat;
1356        }
1357        errno = EACCES;
1358        return -1;
1359}
1360
1361/*
1362 * Note that this doesn't return the actual pagesize, but
1363 * the allocation granularity. If future Windows specific git code
1364 * needs the real getpagesize function, we need to find another solution.
1365 */
1366int mingw_getpagesize(void)
1367{
1368        SYSTEM_INFO si;
1369        GetSystemInfo(&si);
1370        return si.dwAllocationGranularity;
1371}
1372
1373struct passwd *getpwuid(int uid)
1374{
1375        static char user_name[100];
1376        static struct passwd p;
1377
1378        DWORD len = sizeof(user_name);
1379        if (!GetUserName(user_name, &len))
1380                return NULL;
1381        p.pw_name = user_name;
1382        p.pw_gecos = "unknown";
1383        p.pw_dir = NULL;
1384        return &p;
1385}
1386
1387static HANDLE timer_event;
1388static HANDLE timer_thread;
1389static int timer_interval;
1390static int one_shot;
1391static sig_handler_t timer_fn = SIG_DFL;
1392
1393/* The timer works like this:
1394 * The thread, ticktack(), is a trivial routine that most of the time
1395 * only waits to receive the signal to terminate. The main thread tells
1396 * the thread to terminate by setting the timer_event to the signalled
1397 * state.
1398 * But ticktack() interrupts the wait state after the timer's interval
1399 * length to call the signal handler.
1400 */
1401
1402static unsigned __stdcall ticktack(void *dummy)
1403{
1404        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1405                if (timer_fn == SIG_DFL)
1406                        die("Alarm");
1407                if (timer_fn != SIG_IGN)
1408                        timer_fn(SIGALRM);
1409                if (one_shot)
1410                        break;
1411        }
1412        return 0;
1413}
1414
1415static int start_timer_thread(void)
1416{
1417        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1418        if (timer_event) {
1419                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1420                if (!timer_thread )
1421                        return errno = ENOMEM,
1422                                error("cannot start timer thread");
1423        } else
1424                return errno = ENOMEM,
1425                        error("cannot allocate resources for timer");
1426        return 0;
1427}
1428
1429static void stop_timer_thread(void)
1430{
1431        if (timer_event)
1432                SetEvent(timer_event);  /* tell thread to terminate */
1433        if (timer_thread) {
1434                int rc = WaitForSingleObject(timer_thread, 1000);
1435                if (rc == WAIT_TIMEOUT)
1436                        error("timer thread did not terminate timely");
1437                else if (rc != WAIT_OBJECT_0)
1438                        error("waiting for timer thread failed: %lu",
1439                              GetLastError());
1440                CloseHandle(timer_thread);
1441        }
1442        if (timer_event)
1443                CloseHandle(timer_event);
1444        timer_event = NULL;
1445        timer_thread = NULL;
1446}
1447
1448static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1449{
1450        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1451}
1452
1453int setitimer(int type, struct itimerval *in, struct itimerval *out)
1454{
1455        static const struct timeval zero;
1456        static int atexit_done;
1457
1458        if (out != NULL)
1459                return errno = EINVAL,
1460                        error("setitimer param 3 != NULL not implemented");
1461        if (!is_timeval_eq(&in->it_interval, &zero) &&
1462            !is_timeval_eq(&in->it_interval, &in->it_value))
1463                return errno = EINVAL,
1464                        error("setitimer: it_interval must be zero or eq it_value");
1465
1466        if (timer_thread)
1467                stop_timer_thread();
1468
1469        if (is_timeval_eq(&in->it_value, &zero) &&
1470            is_timeval_eq(&in->it_interval, &zero))
1471                return 0;
1472
1473        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1474        one_shot = is_timeval_eq(&in->it_interval, &zero);
1475        if (!atexit_done) {
1476                atexit(stop_timer_thread);
1477                atexit_done = 1;
1478        }
1479        return start_timer_thread();
1480}
1481
1482int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1483{
1484        if (sig != SIGALRM)
1485                return errno = EINVAL,
1486                        error("sigaction only implemented for SIGALRM");
1487        if (out != NULL)
1488                return errno = EINVAL,
1489                        error("sigaction: param 3 != NULL not implemented");
1490
1491        timer_fn = in->sa_handler;
1492        return 0;
1493}
1494
1495#undef signal
1496sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1497{
1498        sig_handler_t old = timer_fn;
1499        if (sig != SIGALRM)
1500                return signal(sig, handler);
1501        timer_fn = handler;
1502        return old;
1503}
1504
1505static const char *make_backslash_path(const char *path)
1506{
1507        static char buf[PATH_MAX + 1];
1508        char *c;
1509
1510        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1511                die("Too long path: %.*s", 60, path);
1512
1513        for (c = buf; *c; c++) {
1514                if (*c == '/')
1515                        *c = '\\';
1516        }
1517        return buf;
1518}
1519
1520void mingw_open_html(const char *unixpath)
1521{
1522        const char *htmlpath = make_backslash_path(unixpath);
1523        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1524                        const char *, const char *, const char *, INT);
1525        T ShellExecute;
1526        HMODULE shell32;
1527        int r;
1528
1529        shell32 = LoadLibrary("shell32.dll");
1530        if (!shell32)
1531                die("cannot load shell32.dll");
1532        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1533        if (!ShellExecute)
1534                die("cannot run browser");
1535
1536        printf("Launching default browser to display HTML ...\n");
1537        r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1538        FreeLibrary(shell32);
1539        /* see the MSDN documentation referring to the result codes here */
1540        if (r <= 32) {
1541                die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1542        }
1543}
1544
1545int link(const char *oldpath, const char *newpath)
1546{
1547        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1548        static T create_hard_link = NULL;
1549        if (!create_hard_link) {
1550                create_hard_link = (T) GetProcAddress(
1551                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1552                if (!create_hard_link)
1553                        create_hard_link = (T)-1;
1554        }
1555        if (create_hard_link == (T)-1) {
1556                errno = ENOSYS;
1557                return -1;
1558        }
1559        if (!create_hard_link(newpath, oldpath, NULL)) {
1560                errno = err_win_to_posix(GetLastError());
1561                return -1;
1562        }
1563        return 0;
1564}
1565
1566char *getpass(const char *prompt)
1567{
1568        struct strbuf buf = STRBUF_INIT;
1569
1570        fputs(prompt, stderr);
1571        for (;;) {
1572                char c = _getch();
1573                if (c == '\r' || c == '\n')
1574                        break;
1575                strbuf_addch(&buf, c);
1576        }
1577        fputs("\n", stderr);
1578        return strbuf_detach(&buf, NULL);
1579}
1580
1581pid_t waitpid(pid_t pid, int *status, unsigned options)
1582{
1583        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1584            FALSE, pid);
1585        if (!h) {
1586                errno = ECHILD;
1587                return -1;
1588        }
1589
1590        if (pid > 0 && options & WNOHANG) {
1591                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1592                        CloseHandle(h);
1593                        return 0;
1594                }
1595                options &= ~WNOHANG;
1596        }
1597
1598        if (options == 0) {
1599                struct pinfo_t **ppinfo;
1600                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1601                        CloseHandle(h);
1602                        return 0;
1603                }
1604
1605                if (status)
1606                        GetExitCodeProcess(h, (LPDWORD)status);
1607
1608                EnterCriticalSection(&pinfo_cs);
1609
1610                ppinfo = &pinfo;
1611                while (*ppinfo) {
1612                        struct pinfo_t *info = *ppinfo;
1613                        if (info->pid == pid) {
1614                                CloseHandle(info->proc);
1615                                *ppinfo = info->next;
1616                                free(info);
1617                                break;
1618                        }
1619                        ppinfo = &info->next;
1620                }
1621
1622                LeaveCriticalSection(&pinfo_cs);
1623
1624                CloseHandle(h);
1625                return pid;
1626        }
1627        CloseHandle(h);
1628
1629        errno = EINVAL;
1630        return -1;
1631}
1632
1633#ifndef NO_MINGW_REPLACE_READDIR
1634/* MinGW readdir implementation to avoid extra lstats for Git */
1635struct mingw_DIR
1636{
1637        struct _finddata_t      dd_dta;         /* disk transfer area for this dir */
1638        struct mingw_dirent     dd_dir;         /* Our own implementation, including d_type */
1639        long                    dd_handle;      /* _findnext handle */
1640        int                     dd_stat;        /* 0 = next entry to read is first entry, -1 = off the end, positive = 0 based index of next entry */
1641        char                    dd_name[1];     /* given path for dir with search pattern (struct is extended) */
1642};
1643
1644struct dirent *mingw_readdir(DIR *dir)
1645{
1646        WIN32_FIND_DATAA buf;
1647        HANDLE handle;
1648        struct mingw_DIR *mdir = (struct mingw_DIR*)dir;
1649
1650        if (!dir->dd_handle) {
1651                errno = EBADF; /* No set_errno for mingw */
1652                return NULL;
1653        }
1654
1655        if (dir->dd_handle == (long)INVALID_HANDLE_VALUE && dir->dd_stat == 0)
1656        {
1657                DWORD lasterr;
1658                handle = FindFirstFileA(dir->dd_name, &buf);
1659                lasterr = GetLastError();
1660                dir->dd_handle = (long)handle;
1661                if (handle == INVALID_HANDLE_VALUE && (lasterr != ERROR_NO_MORE_FILES)) {
1662                        errno = err_win_to_posix(lasterr);
1663                        return NULL;
1664                }
1665        } else if (dir->dd_handle == (long)INVALID_HANDLE_VALUE) {
1666                return NULL;
1667        } else if (!FindNextFileA((HANDLE)dir->dd_handle, &buf)) {
1668                DWORD lasterr = GetLastError();
1669                FindClose((HANDLE)dir->dd_handle);
1670                dir->dd_handle = (long)INVALID_HANDLE_VALUE;
1671                /* POSIX says you shouldn't set errno when readdir can't
1672                   find any more files; so, if another error we leave it set. */
1673                if (lasterr != ERROR_NO_MORE_FILES)
1674                        errno = err_win_to_posix(lasterr);
1675                return NULL;
1676        }
1677
1678        /* We get here if `buf' contains valid data.  */
1679        strcpy(dir->dd_dir.d_name, buf.cFileName);
1680        ++dir->dd_stat;
1681
1682        /* Set file type, based on WIN32_FIND_DATA */
1683        mdir->dd_dir.d_type = 0;
1684        if (buf.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
1685                mdir->dd_dir.d_type |= DT_DIR;
1686        else
1687                mdir->dd_dir.d_type |= DT_REG;
1688
1689        return (struct dirent*)&dir->dd_dir;
1690}
1691#endif // !NO_MINGW_REPLACE_READDIR