compat/mingw.c

   1 #include "../git-compat-util.h"
   2 #include "win32.h"
   3 #include <conio.h>
   4 #include "../strbuf.h"
   5 #include "../cache.h"
   6
   7 unsigned int _CRT_fmode = _O_BINARY;
   8
   9 int err_win_to_posix(DWORD winerr)
  10 {
  11         int error = ENOSYS;
  12         switch(winerr) {
  13         case ERROR_ACCESS_DENIED: error = EACCES; break;
  14         case ERROR_ACCOUNT_DISABLED: error = EACCES; break;
  15         case ERROR_ACCOUNT_RESTRICTION: error = EACCES; break;
  16         case ERROR_ALREADY_ASSIGNED: error = EBUSY; break;
  17         case ERROR_ALREADY_EXISTS: error = EEXIST; break;
  18         case ERROR_ARITHMETIC_OVERFLOW: error = ERANGE; break;
  19         case ERROR_BAD_COMMAND: error = EIO; break;
  20         case ERROR_BAD_DEVICE: error = ENODEV; break;
  21         case ERROR_BAD_DRIVER_LEVEL: error = ENXIO; break;
  22         case ERROR_BAD_EXE_FORMAT: error = ENOEXEC; break;
  23         case ERROR_BAD_FORMAT: error = ENOEXEC; break;
  24         case ERROR_BAD_LENGTH: error = EINVAL; break;
  25         case ERROR_BAD_PATHNAME: error = ENOENT; break;
  26         case ERROR_BAD_PIPE: error = EPIPE; break;
  27         case ERROR_BAD_UNIT: error = ENODEV; break;
  28         case ERROR_BAD_USERNAME: error = EINVAL; break;
  29         case ERROR_BROKEN_PIPE: error = EPIPE; break;
  30         case ERROR_BUFFER_OVERFLOW: error = ENAMETOOLONG; break;
  31         case ERROR_BUSY: error = EBUSY; break;
  32         case ERROR_BUSY_DRIVE: error = EBUSY; break;
  33         case ERROR_CALL_NOT_IMPLEMENTED: error = ENOSYS; break;
  34         case ERROR_CANNOT_MAKE: error = EACCES; break;
  35         case ERROR_CANTOPEN: error = EIO; break;
  36         case ERROR_CANTREAD: error = EIO; break;
  37         case ERROR_CANTWRITE: error = EIO; break;
  38         case ERROR_CRC: error = EIO; break;
  39         case ERROR_CURRENT_DIRECTORY: error = EACCES; break;
  40         case ERROR_DEVICE_IN_USE: error = EBUSY; break;
  41         case ERROR_DEV_NOT_EXIST: error = ENODEV; break;
  42         case ERROR_DIRECTORY: error = EINVAL; break;
  43         case ERROR_DIR_NOT_EMPTY: error = ENOTEMPTY; break;
  44         case ERROR_DISK_CHANGE: error = EIO; break;
  45         case ERROR_DISK_FULL: error = ENOSPC; break;
  46         case ERROR_DRIVE_LOCKED: error = EBUSY; break;
  47         case ERROR_ENVVAR_NOT_FOUND: error = EINVAL; break;
  48         case ERROR_EXE_MARKED_INVALID: error = ENOEXEC; break;
  49         case ERROR_FILENAME_EXCED_RANGE: error = ENAMETOOLONG; break;
  50         case ERROR_FILE_EXISTS: error = EEXIST; break;
  51         case ERROR_FILE_INVALID: error = ENODEV; break;
  52         case ERROR_FILE_NOT_FOUND: error = ENOENT; break;
  53         case ERROR_GEN_FAILURE: error = EIO; break;
  54         case ERROR_HANDLE_DISK_FULL: error = ENOSPC; break;
  55         case ERROR_INSUFFICIENT_BUFFER: error = ENOMEM; break;
  56         case ERROR_INVALID_ACCESS: error = EACCES; break;
  57         case ERROR_INVALID_ADDRESS: error = EFAULT; break;
  58         case ERROR_INVALID_BLOCK: error = EFAULT; break;
  59         case ERROR_INVALID_DATA: error = EINVAL; break;
  60         case ERROR_INVALID_DRIVE: error = ENODEV; break;
  61         case ERROR_INVALID_EXE_SIGNATURE: error = ENOEXEC; break;
  62         case ERROR_INVALID_FLAGS: error = EINVAL; break;
  63         case ERROR_INVALID_FUNCTION: error = ENOSYS; break;
  64         case ERROR_INVALID_HANDLE: error = EBADF; break;
  65         case ERROR_INVALID_LOGON_HOURS: error = EACCES; break;
  66         case ERROR_INVALID_NAME: error = EINVAL; break;
  67         case ERROR_INVALID_OWNER: error = EINVAL; break;
  68         case ERROR_INVALID_PARAMETER: error = EINVAL; break;
  69         case ERROR_INVALID_PASSWORD: error = EPERM; break;
  70         case ERROR_INVALID_PRIMARY_GROUP: error = EINVAL; break;
  71         case ERROR_INVALID_SIGNAL_NUMBER: error = EINVAL; break;
  72         case ERROR_INVALID_TARGET_HANDLE: error = EIO; break;
  73         case ERROR_INVALID_WORKSTATION: error = EACCES; break;
  74         case ERROR_IO_DEVICE: error = EIO; break;
  75         case ERROR_IO_INCOMPLETE: error = EINTR; break;
  76         case ERROR_LOCKED: error = EBUSY; break;
  77         case ERROR_LOCK_VIOLATION: error = EACCES; break;
  78         case ERROR_LOGON_FAILURE: error = EACCES; break;
  79         case ERROR_MAPPED_ALIGNMENT: error = EINVAL; break;
  80         case ERROR_META_EXPANSION_TOO_LONG: error = E2BIG; break;
  81         case ERROR_MORE_DATA: error = EPIPE; break;
  82         case ERROR_NEGATIVE_SEEK: error = ESPIPE; break;
  83         case ERROR_NOACCESS: error = EFAULT; break;
  84         case ERROR_NONE_MAPPED: error = EINVAL; break;
  85         case ERROR_NOT_ENOUGH_MEMORY: error = ENOMEM; break;
  86         case ERROR_NOT_READY: error = EAGAIN; break;
  87         case ERROR_NOT_SAME_DEVICE: error = EXDEV; break;
  88         case ERROR_NO_DATA: error = EPIPE; break;
  89         case ERROR_NO_MORE_SEARCH_HANDLES: error = EIO; break;
  90         case ERROR_NO_PROC_SLOTS: error = EAGAIN; break;
  91         case ERROR_NO_SUCH_PRIVILEGE: error = EACCES; break;
  92         case ERROR_OPEN_FAILED: error = EIO; break;
  93         case ERROR_OPEN_FILES: error = EBUSY; break;
  94         case ERROR_OPERATION_ABORTED: error = EINTR; break;
  95         case ERROR_OUTOFMEMORY: error = ENOMEM; break;
  96         case ERROR_PASSWORD_EXPIRED: error = EACCES; break;
  97         case ERROR_PATH_BUSY: error = EBUSY; break;
  98         case ERROR_PATH_NOT_FOUND: error = ENOENT; break;
  99         case ERROR_PIPE_BUSY: error = EBUSY; break;
 100         case ERROR_PIPE_CONNECTED: error = EPIPE; break;
 101         case ERROR_PIPE_LISTENING: error = EPIPE; break;
 102         case ERROR_PIPE_NOT_CONNECTED: error = EPIPE; break;
 103         case ERROR_PRIVILEGE_NOT_HELD: error = EACCES; break;
 104         case ERROR_READ_FAULT: error = EIO; break;
 105         case ERROR_SEEK: error = EIO; break;
 106         case ERROR_SEEK_ON_DEVICE: error = ESPIPE; break;
 107         case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
 108         case ERROR_SHARING_VIOLATION: error = EACCES; break;
 109         case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
 110         case ERROR_SWAPERROR: error = ENOENT; break;
 111         case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
 112         case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
 113         case ERROR_UNRECOGNIZED_MEDIA: error = ENXIO; break;
 114         case ERROR_UNRECOGNIZED_VOLUME: error = ENODEV; break;
 115         case ERROR_WAIT_NO_CHILDREN: error = ECHILD; break;
 116         case ERROR_WRITE_FAULT: error = EIO; break;
 117         case ERROR_WRITE_PROTECT: error = EROFS; break;
 118         }
 119         return error;
 120 }
 121
 122 static int make_hidden(const char *path)
 123 {
 124         DWORD attribs = GetFileAttributes(path);
 125         if (SetFileAttributes(path, FILE_ATTRIBUTE_HIDDEN | attribs))
 126                 return 0;
 127         errno = err_win_to_posix(GetLastError());
 128         return -1;
 129 }
 130
 131 void mingw_mark_as_git_dir(const char *dir)
 132 {
 133         if (hide_dotfiles != HIDE_DOTFILES_FALSE && make_hidden(dir))
 134                 warning("Failed to make '%s' hidden", dir);
 135         git_config_set("core.hideDotFiles",
 136                 hide_dotfiles == HIDE_DOTFILES_FALSE ? "false" :
 137                 (hide_dotfiles == HIDE_DOTFILES_DOTGITONLY ?
 138                  "dotGitOnly" : "true"));
 139 }
 140
 141 #undef mkdir
 142 int mingw_mkdir(const char *path, int mode)
 143 {
 144         int ret = mkdir(path);
 145         if (!ret && hide_dotfiles == HIDE_DOTFILES_TRUE) {
 146                 /*
 147                  * In Windows a file or dir starting with a dot is not
 148                  * automatically hidden. So lets mark it as hidden when
 149                  * such a directory is created.
 150                  */
 151                 const char *start = basename((char*)path);
 152                 if (*start == '.')
 153                         return make_hidden(path);
 154         }
 155         return ret;
 156 }
 157
 158 #undef open
 159 int mingw_open (const char *filename, int oflags, ...)
 160 {
 161         va_list args;
 162         unsigned mode;
 163         int fd;
 164
 165         va_start(args, oflags);
 166         mode = va_arg(args, int);
 167         va_end(args);
 168
 169         if (filename && !strcmp(filename, "/dev/null"))
 170                 filename = "nul";
 171
 172         fd = open(filename, oflags, mode);
 173
 174         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 175                 DWORD attrs = GetFileAttributes(filename);
 176                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 177                         errno = EISDIR;
 178         }
 179         if ((oflags & O_CREAT) && fd >= 0 &&
 180             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 181                 /*
 182                  * In Windows a file or dir starting with a dot is not
 183                  * automatically hidden. So lets mark it as hidden when
 184                  * such a file is created.
 185                  */
 186                 const char *start = basename((char*)filename);
 187                 if (*start == '.' && make_hidden(filename))
 188                         warning("Could not mark '%s' as hidden.", filename);
 189         }
 190         return fd;
 191 }
 192
 193 #undef write
 194 ssize_t mingw_write(int fd, const void *buf, size_t count)
 195 {
 196         /*
 197          * While write() calls to a file on a local disk are translated
 198          * into WriteFile() calls with a maximum size of 64KB on Windows
 199          * XP and 256KB on Vista, no such cap is placed on writes to
 200          * files over the network on Windows XP.  Unfortunately, there
 201          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 202          * bigger writes fail on Windows XP.
 203          * So we cap to a nice 31MB here to avoid write failures over
 204          * the net without changing the number of WriteFile() calls in
 205          * the local case.
 206          */
 207         return write(fd, buf, min(count, 31 * 1024 * 1024));
 208 }
 209
 210 #undef fopen
 211 FILE *mingw_fopen (const char *filename, const char *otype)
 212 {
 213         int hide = 0;
 214         FILE *file;
 215         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 216             basename((char*)filename)[0] == '.')
 217                 hide = access(filename, F_OK);
 218         if (filename && !strcmp(filename, "/dev/null"))
 219                 filename = "nul";
 220         file = fopen(filename, otype);
 221         if (file && hide && make_hidden(filename))
 222                 warning("Could not mark '%s' as hidden.", filename);
 223         return file;
 224 }
 225
 226 #undef freopen
 227 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 228 {
 229         int hide = 0;
 230         FILE *file;
 231         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 232             basename((char*)filename)[0] == '.')
 233                 hide = access(filename, F_OK);
 234         if (filename && !strcmp(filename, "/dev/null"))
 235                 filename = "nul";
 236         file = freopen(filename, otype, stream);
 237         if (file && hide && make_hidden(filename))
 238                 warning("Could not mark '%s' as hidden.", filename);
 239         return file;
 240 }
 241
 242 /*
 243  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 244  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 245  */
 246 static inline long long filetime_to_hnsec(const FILETIME *ft)
 247 {
 248         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 249         /* Windows to Unix Epoch conversion */
 250         return winTime - 116444736000000000LL;
 251 }
 252
 253 static inline time_t filetime_to_time_t(const FILETIME *ft)
 254 {
 255         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 256 }
 257
 258 /* We keep the do_lstat code in a separate function to avoid recursion.
 259  * When a path ends with a slash, the stat will fail with ENOENT. In
 260  * this case, we strip the trailing slashes and stat again.
 261  *
 262  * If follow is true then act like stat() and report on the link
 263  * target. Otherwise report on the link itself.
 264  */
 265 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 266 {
 267         int err;
 268         WIN32_FILE_ATTRIBUTE_DATA fdata;
 269
 270         if (!(err = get_file_attr(file_name, &fdata))) {
 271                 buf->st_ino = 0;
 272                 buf->st_gid = 0;
 273                 buf->st_uid = 0;
 274                 buf->st_nlink = 1;
 275                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 276                 buf->st_size = fdata.nFileSizeLow |
 277                         (((off_t)fdata.nFileSizeHigh)<<32);
 278                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 279                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 280                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 281                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 282                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 283                         WIN32_FIND_DATAA findbuf;
 284                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 285                         if (handle != INVALID_HANDLE_VALUE) {
 286                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 287                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 288                                         if (follow) {
 289                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 290                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 291                                         } else {
 292                                                 buf->st_mode = S_IFLNK;
 293                                         }
 294                                         buf->st_mode |= S_IREAD;
 295                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 296                                                 buf->st_mode |= S_IWRITE;
 297                                 }
 298                                 FindClose(handle);
 299                         }
 300                 }
 301                 return 0;
 302         }
 303         errno = err;
 304         return -1;
 305 }
 306
 307 /* We provide our own lstat/fstat functions, since the provided
 308  * lstat/fstat functions are so slow. These stat functions are
 309  * tailored for Git's usage (read: fast), and are not meant to be
 310  * complete. Note that Git stat()s are redirected to mingw_lstat()
 311  * too, since Windows doesn't really handle symlinks that well.
 312  */
 313 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 314 {
 315         int namelen;
 316         static char alt_name[PATH_MAX];
 317
 318         if (!do_lstat(follow, file_name, buf))
 319                 return 0;
 320
 321         /* if file_name ended in a '/', Windows returned ENOENT;
 322          * try again without trailing slashes
 323          */
 324         if (errno != ENOENT)
 325                 return -1;
 326
 327         namelen = strlen(file_name);
 328         if (namelen && file_name[namelen-1] != '/')
 329                 return -1;
 330         while (namelen && file_name[namelen-1] == '/')
 331                 --namelen;
 332         if (!namelen || namelen >= PATH_MAX)
 333                 return -1;
 334
 335         memcpy(alt_name, file_name, namelen);
 336         alt_name[namelen] = 0;
 337         return do_lstat(follow, alt_name, buf);
 338 }
 339
 340 int mingw_lstat(const char *file_name, struct stat *buf)
 341 {
 342         return do_stat_internal(0, file_name, buf);
 343 }
 344 int mingw_stat(const char *file_name, struct stat *buf)
 345 {
 346         return do_stat_internal(1, file_name, buf);
 347 }
 348
 349 #undef fstat
 350 int mingw_fstat(int fd, struct stat *buf)
 351 {
 352         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 353         BY_HANDLE_FILE_INFORMATION fdata;
 354
 355         if (fh == INVALID_HANDLE_VALUE) {
 356                 errno = EBADF;
 357                 return -1;
 358         }
 359         /* direct non-file handles to MS's fstat() */
 360         if (GetFileType(fh) != FILE_TYPE_DISK)
 361                 return _fstati64(fd, buf);
 362
 363         if (GetFileInformationByHandle(fh, &fdata)) {
 364                 buf->st_ino = 0;
 365                 buf->st_gid = 0;
 366                 buf->st_uid = 0;
 367                 buf->st_nlink = 1;
 368                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 369                 buf->st_size = fdata.nFileSizeLow |
 370                         (((off_t)fdata.nFileSizeHigh)<<32);
 371                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 372                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 373                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 374                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 375                 return 0;
 376         }
 377         errno = EBADF;
 378         return -1;
 379 }
 380
 381 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 382 {
 383         long long winTime = t * 10000000LL + 116444736000000000LL;
 384         ft->dwLowDateTime = winTime;
 385         ft->dwHighDateTime = winTime >> 32;
 386 }
 387
 388 int mingw_utime (const char *file_name, const struct utimbuf *times)
 389 {
 390         FILETIME mft, aft;
 391         int fh, rc;
 392
 393         /* must have write permission */
 394         DWORD attrs = GetFileAttributes(file_name);
 395         if (attrs != INVALID_FILE_ATTRIBUTES &&
 396             (attrs & FILE_ATTRIBUTE_READONLY)) {
 397                 /* ignore errors here; open() will report them */
 398                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 399         }
 400
 401         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 402                 rc = -1;
 403                 goto revert_attrs;
 404         }
 405
 406         if (times) {
 407                 time_t_to_filetime(times->modtime, &mft);
 408                 time_t_to_filetime(times->actime, &aft);
 409         } else {
 410                 GetSystemTimeAsFileTime(&mft);
 411                 aft = mft;
 412         }
 413         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 414                 errno = EINVAL;
 415                 rc = -1;
 416         } else
 417                 rc = 0;
 418         close(fh);
 419
 420 revert_attrs:
 421         if (attrs != INVALID_FILE_ATTRIBUTES &&
 422             (attrs & FILE_ATTRIBUTE_READONLY)) {
 423                 /* ignore errors again */
 424                 SetFileAttributes(file_name, attrs);
 425         }
 426         return rc;
 427 }
 428
 429 unsigned int sleep (unsigned int seconds)
 430 {
 431         Sleep(seconds*1000);
 432         return 0;
 433 }
 434
 435 int mkstemp(char *template)
 436 {
 437         char *filename = mktemp(template);
 438         if (filename == NULL)
 439                 return -1;
 440         return open(filename, O_RDWR | O_CREAT, 0600);
 441 }
 442
 443 int gettimeofday(struct timeval *tv, void *tz)
 444 {
 445         FILETIME ft;
 446         long long hnsec;
 447
 448         GetSystemTimeAsFileTime(&ft);
 449         hnsec = filetime_to_hnsec(&ft);
 450         tv->tv_sec = hnsec / 10000000;
 451         tv->tv_usec = (hnsec % 10000000) / 10;
 452         return 0;
 453 }
 454
 455 int pipe(int filedes[2])
 456 {
 457         HANDLE h[2];
 458
 459         /* this creates non-inheritable handles */
 460         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 461                 errno = err_win_to_posix(GetLastError());
 462                 return -1;
 463         }
 464         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 465         if (filedes[0] < 0) {
 466                 CloseHandle(h[0]);
 467                 CloseHandle(h[1]);
 468                 return -1;
 469         }
 470         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 471         if (filedes[0] < 0) {
 472                 close(filedes[0]);
 473                 CloseHandle(h[1]);
 474                 return -1;
 475         }
 476         return 0;
 477 }
 478
 479 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 480 {
 481         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 482         memcpy(result, gmtime(timep), sizeof(struct tm));
 483         return result;
 484 }
 485
 486 struct tm *localtime_r(const time_t *timep, struct tm *result)
 487 {
 488         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 489         memcpy(result, localtime(timep), sizeof(struct tm));
 490         return result;
 491 }
 492
 493 #undef getcwd
 494 char *mingw_getcwd(char *pointer, int len)
 495 {
 496         int i;
 497         char *ret = getcwd(pointer, len);
 498         if (!ret)
 499                 return ret;
 500         for (i = 0; pointer[i]; i++)
 501                 if (pointer[i] == '\\')
 502                         pointer[i] = '/';
 503         return ret;
 504 }
 505
 506 #undef getenv
 507 char *mingw_getenv(const char *name)
 508 {
 509         char *result = getenv(name);
 510         if (!result && !strcmp(name, "TMPDIR")) {
 511                 /* on Windows it is TMP and TEMP */
 512                 result = getenv("TMP");
 513                 if (!result)
 514                         result = getenv("TEMP");
 515         }
 516         return result;
 517 }
 518
 519 /*
 520  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 521  * (Parsing C++ Command-Line Arguments)
 522  */
 523 static const char *quote_arg(const char *arg)
 524 {
 525         /* count chars to quote */
 526         int len = 0, n = 0;
 527         int force_quotes = 0;
 528         char *q, *d;
 529         const char *p = arg;
 530         if (!*p) force_quotes = 1;
 531         while (*p) {
 532                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 533                         force_quotes = 1;
 534                 else if (*p == '"')
 535                         n++;
 536                 else if (*p == '\\') {
 537                         int count = 0;
 538                         while (*p == '\\') {
 539                                 count++;
 540                                 p++;
 541                                 len++;
 542                         }
 543                         if (*p == '"')
 544                                 n += count*2 + 1;
 545                         continue;
 546                 }
 547                 len++;
 548                 p++;
 549         }
 550         if (!force_quotes && n == 0)
 551                 return arg;
 552
 553         /* insert \ where necessary */
 554         d = q = xmalloc(len+n+3);
 555         *d++ = '"';
 556         while (*arg) {
 557                 if (*arg == '"')
 558                         *d++ = '\\';
 559                 else if (*arg == '\\') {
 560                         int count = 0;
 561                         while (*arg == '\\') {
 562                                 count++;
 563                                 *d++ = *arg++;
 564                         }
 565                         if (*arg == '"') {
 566                                 while (count-- > 0)
 567                                         *d++ = '\\';
 568                                 *d++ = '\\';
 569                         }
 570                 }
 571                 *d++ = *arg++;
 572         }
 573         *d++ = '"';
 574         *d++ = 0;
 575         return q;
 576 }
 577
 578 static const char *parse_interpreter(const char *cmd)
 579 {
 580         static char buf[100];
 581         char *p, *opt;
 582         int n, fd;
 583
 584         /* don't even try a .exe */
 585         n = strlen(cmd);
 586         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 587                 return NULL;
 588
 589         fd = open(cmd, O_RDONLY);
 590         if (fd < 0)
 591                 return NULL;
 592         n = read(fd, buf, sizeof(buf)-1);
 593         close(fd);
 594         if (n < 4)      /* at least '#!/x' and not error */
 595                 return NULL;
 596
 597         if (buf[0] != '#' || buf[1] != '!')
 598                 return NULL;
 599         buf[n] = '\0';
 600         p = buf + strcspn(buf, "\r\n");
 601         if (!*p)
 602                 return NULL;
 603
 604         *p = '\0';
 605         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 606                 return NULL;
 607         /* strip options */
 608         if ((opt = strchr(p+1, ' ')))
 609                 *opt = '\0';
 610         return p+1;
 611 }
 612
 613 /*
 614  * Splits the PATH into parts.
 615  */
 616 static char **get_path_split(void)
 617 {
 618         char *p, **path, *envpath = getenv("PATH");
 619         int i, n = 0;
 620
 621         if (!envpath || !*envpath)
 622                 return NULL;
 623
 624         envpath = xstrdup(envpath);
 625         p = envpath;
 626         while (p) {
 627                 char *dir = p;
 628                 p = strchr(p, ';');
 629                 if (p) *p++ = '\0';
 630                 if (*dir) {     /* not earlier, catches series of ; */
 631                         ++n;
 632                 }
 633         }
 634         if (!n)
 635                 return NULL;
 636
 637         path = xmalloc((n+1)*sizeof(char *));
 638         p = envpath;
 639         i = 0;
 640         do {
 641                 if (*p)
 642                         path[i++] = xstrdup(p);
 643                 p = p+strlen(p)+1;
 644         } while (i < n);
 645         path[i] = NULL;
 646
 647         free(envpath);
 648
 649         return path;
 650 }
 651
 652 static void free_path_split(char **path)
 653 {
 654         char **p = path;
 655
 656         if (!path)
 657                 return;
 658
 659         while (*p)
 660                 free(*p++);
 661         free(path);
 662 }
 663
 664 /*
 665  * exe_only means that we only want to detect .exe files, but not scripts
 666  * (which do not have an extension)
 667  */
 668 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 669 {
 670         char path[MAX_PATH];
 671         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 672
 673         if (!isexe && access(path, F_OK) == 0)
 674                 return xstrdup(path);
 675         path[strlen(path)-4] = '\0';
 676         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 677                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 678                         return xstrdup(path);
 679         return NULL;
 680 }
 681
 682 /*
 683  * Determines the absolute path of cmd using the split path in path.
 684  * If cmd contains a slash or backslash, no lookup is performed.
 685  */
 686 static char *path_lookup(const char *cmd, char **path, int exe_only)
 687 {
 688         char *prog = NULL;
 689         int len = strlen(cmd);
 690         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 691
 692         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 693                 prog = xstrdup(cmd);
 694
 695         while (!prog && *path)
 696                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 697
 698         return prog;
 699 }
 700
 701 static int env_compare(const void *a, const void *b)
 702 {
 703         char *const *ea = a;
 704         char *const *eb = b;
 705         return strcasecmp(*ea, *eb);
 706 }
 707
 708 struct pinfo_t {
 709         struct pinfo_t *next;
 710         pid_t pid;
 711         HANDLE proc;
 712 } pinfo_t;
 713 struct pinfo_t *pinfo = NULL;
 714 CRITICAL_SECTION pinfo_cs;
 715
 716 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 717                               const char *dir,
 718                               int prepend_cmd, int fhin, int fhout, int fherr)
 719 {
 720         STARTUPINFO si;
 721         PROCESS_INFORMATION pi;
 722         struct strbuf envblk, args;
 723         unsigned flags;
 724         BOOL ret;
 725
 726         /* Determine whether or not we are associated to a console */
 727         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 728                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 729                         FILE_ATTRIBUTE_NORMAL, NULL);
 730         if (cons == INVALID_HANDLE_VALUE) {
 731                 /* There is no console associated with this process.
 732                  * Since the child is a console process, Windows
 733                  * would normally create a console window. But
 734                  * since we'll be redirecting std streams, we do
 735                  * not need the console.
 736                  * It is necessary to use DETACHED_PROCESS
 737                  * instead of CREATE_NO_WINDOW to make ssh
 738                  * recognize that it has no console.
 739                  */
 740                 flags = DETACHED_PROCESS;
 741         } else {
 742                 /* There is already a console. If we specified
 743                  * DETACHED_PROCESS here, too, Windows would
 744                  * disassociate the child from the console.
 745                  * The same is true for CREATE_NO_WINDOW.
 746                  * Go figure!
 747                  */
 748                 flags = 0;
 749                 CloseHandle(cons);
 750         }
 751         memset(&si, 0, sizeof(si));
 752         si.cb = sizeof(si);
 753         si.dwFlags = STARTF_USESTDHANDLES;
 754         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 755         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 756         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 757
 758         /* concatenate argv, quoting args as we go */
 759         strbuf_init(&args, 0);
 760         if (prepend_cmd) {
 761                 char *quoted = (char *)quote_arg(cmd);
 762                 strbuf_addstr(&args, quoted);
 763                 if (quoted != cmd)
 764                         free(quoted);
 765         }
 766         for (; *argv; argv++) {
 767                 char *quoted = (char *)quote_arg(*argv);
 768                 if (*args.buf)
 769                         strbuf_addch(&args, ' ');
 770                 strbuf_addstr(&args, quoted);
 771                 if (quoted != *argv)
 772                         free(quoted);
 773         }
 774
 775         if (env) {
 776                 int count = 0;
 777                 char **e, **sorted_env;
 778
 779                 for (e = env; *e; e++)
 780                         count++;
 781
 782                 /* environment must be sorted */
 783                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 784                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 785                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 786
 787                 strbuf_init(&envblk, 0);
 788                 for (e = sorted_env; *e; e++) {
 789                         strbuf_addstr(&envblk, *e);
 790                         strbuf_addch(&envblk, '\0');
 791                 }
 792                 free(sorted_env);
 793         }
 794
 795         memset(&pi, 0, sizeof(pi));
 796         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 797                 env ? envblk.buf : NULL, dir, &si, &pi);
 798
 799         if (env)
 800                 strbuf_release(&envblk);
 801         strbuf_release(&args);
 802
 803         if (!ret) {
 804                 errno = ENOENT;
 805                 return -1;
 806         }
 807         CloseHandle(pi.hThread);
 808
 809         /*
 810          * The process ID is the human-readable identifier of the process
 811          * that we want to present in log and error messages. The handle
 812          * is not useful for this purpose. But we cannot close it, either,
 813          * because it is not possible to turn a process ID into a process
 814          * handle after the process terminated.
 815          * Keep the handle in a list for waitpid.
 816          */
 817         EnterCriticalSection(&pinfo_cs);
 818         {
 819                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 820                 info->pid = pi.dwProcessId;
 821                 info->proc = pi.hProcess;
 822                 info->next = pinfo;
 823                 pinfo = info;
 824         }
 825         LeaveCriticalSection(&pinfo_cs);
 826
 827         return (pid_t)pi.dwProcessId;
 828 }
 829
 830 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 831                            int prepend_cmd)
 832 {
 833         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 834 }
 835
 836 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 837                      const char *dir,
 838                      int fhin, int fhout, int fherr)
 839 {
 840         pid_t pid;
 841         char **path = get_path_split();
 842         char *prog = path_lookup(cmd, path, 0);
 843
 844         if (!prog) {
 845                 errno = ENOENT;
 846                 pid = -1;
 847         }
 848         else {
 849                 const char *interpr = parse_interpreter(prog);
 850
 851                 if (interpr) {
 852                         const char *argv0 = argv[0];
 853                         char *iprog = path_lookup(interpr, path, 1);
 854                         argv[0] = prog;
 855                         if (!iprog) {
 856                                 errno = ENOENT;
 857                                 pid = -1;
 858                         }
 859                         else {
 860                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 861                                                        fhin, fhout, fherr);
 862                                 free(iprog);
 863                         }
 864                         argv[0] = argv0;
 865                 }
 866                 else
 867                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 868                                                fhin, fhout, fherr);
 869                 free(prog);
 870         }
 871         free_path_split(path);
 872         return pid;
 873 }
 874
 875 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 876 {
 877         const char *interpr = parse_interpreter(cmd);
 878         char **path;
 879         char *prog;
 880         int pid = 0;
 881
 882         if (!interpr)
 883                 return 0;
 884         path = get_path_split();
 885         prog = path_lookup(interpr, path, 1);
 886         if (prog) {
 887                 int argc = 0;
 888                 const char **argv2;
 889                 while (argv[argc]) argc++;
 890                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 891                 argv2[0] = (char *)cmd; /* full path to the script file */
 892                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 893                 pid = mingw_spawnve(prog, argv2, env, 1);
 894                 if (pid >= 0) {
 895                         int status;
 896                         if (waitpid(pid, &status, 0) < 0)
 897                                 status = 255;
 898                         exit(status);
 899                 }
 900                 pid = 1;        /* indicate that we tried but failed */
 901                 free(prog);
 902                 free(argv2);
 903         }
 904         free_path_split(path);
 905         return pid;
 906 }
 907
 908 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 909 {
 910         /* check if git_command is a shell script */
 911         if (!try_shell_exec(cmd, argv, (char **)env)) {
 912                 int pid, status;
 913
 914                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 915                 if (pid < 0)
 916                         return;
 917                 if (waitpid(pid, &status, 0) < 0)
 918                         status = 255;
 919                 exit(status);
 920         }
 921 }
 922
 923 void mingw_execvp(const char *cmd, char *const *argv)
 924 {
 925         char **path = get_path_split();
 926         char *prog = path_lookup(cmd, path, 0);
 927
 928         if (prog) {
 929                 mingw_execve(prog, argv, environ);
 930                 free(prog);
 931         } else
 932                 errno = ENOENT;
 933
 934         free_path_split(path);
 935 }
 936
 937 void mingw_execv(const char *cmd, char *const *argv)
 938 {
 939         mingw_execve(cmd, argv, environ);
 940 }
 941
 942 int mingw_kill(pid_t pid, int sig)
 943 {
 944         if (pid > 0 && sig == SIGTERM) {
 945                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
 946
 947                 if (TerminateProcess(h, -1)) {
 948                         CloseHandle(h);
 949                         return 0;
 950                 }
 951
 952                 errno = err_win_to_posix(GetLastError());
 953                 CloseHandle(h);
 954                 return -1;
 955         }
 956
 957         errno = EINVAL;
 958         return -1;
 959 }
 960
 961 static char **copy_environ(void)
 962 {
 963         char **env;
 964         int i = 0;
 965         while (environ[i])
 966                 i++;
 967         env = xmalloc((i+1)*sizeof(*env));
 968         for (i = 0; environ[i]; i++)
 969                 env[i] = xstrdup(environ[i]);
 970         env[i] = NULL;
 971         return env;
 972 }
 973
 974 void free_environ(char **env)
 975 {
 976         int i;
 977         for (i = 0; env[i]; i++)
 978                 free(env[i]);
 979         free(env);
 980 }
 981
 982 static int lookup_env(char **env, const char *name, size_t nmln)
 983 {
 984         int i;
 985
 986         for (i = 0; env[i]; i++) {
 987                 if (0 == strncmp(env[i], name, nmln)
 988                     && '=' == env[i][nmln])
 989                         /* matches */
 990                         return i;
 991         }
 992         return -1;
 993 }
 994
 995 /*
 996  * If name contains '=', then sets the variable, otherwise it unsets it
 997  */
 998 static char **env_setenv(char **env, const char *name)
 999 {
1000         char *eq = strchrnul(name, '=');
1001         int i = lookup_env(env, name, eq-name);
1002
1003         if (i < 0) {
1004                 if (*eq) {
1005                         for (i = 0; env[i]; i++)
1006                                 ;
1007                         env = xrealloc(env, (i+2)*sizeof(*env));
1008                         env[i] = xstrdup(name);
1009                         env[i+1] = NULL;
1010                 }
1011         }
1012         else {
1013                 free(env[i]);
1014                 if (*eq)
1015                         env[i] = xstrdup(name);
1016                 else
1017                         for (; env[i]; i++)
1018                                 env[i] = env[i+1];
1019         }
1020         return env;
1021 }
1022
1023 /*
1024  * Copies global environ and adjusts variables as specified by vars.
1025  */
1026 char **make_augmented_environ(const char *const *vars)
1027 {
1028         char **env = copy_environ();
1029
1030         while (*vars)
1031                 env = env_setenv(env, *vars++);
1032         return env;
1033 }
1034
1035 /*
1036  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1037  * that service contains a numerical port, or that it it is null. It
1038  * does a simple search using gethostbyname, and returns one IPv4 host
1039  * if one was found.
1040  */
1041 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1042                                    const struct addrinfo *hints,
1043                                    struct addrinfo **res)
1044 {
1045         struct hostent *h = NULL;
1046         struct addrinfo *ai;
1047         struct sockaddr_in *sin;
1048
1049         if (node) {
1050                 h = gethostbyname(node);
1051                 if (!h)
1052                         return WSAGetLastError();
1053         }
1054
1055         ai = xmalloc(sizeof(struct addrinfo));
1056         *res = ai;
1057         ai->ai_flags = 0;
1058         ai->ai_family = AF_INET;
1059         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1060         switch (ai->ai_socktype) {
1061         case SOCK_STREAM:
1062                 ai->ai_protocol = IPPROTO_TCP;
1063                 break;
1064         case SOCK_DGRAM:
1065                 ai->ai_protocol = IPPROTO_UDP;
1066                 break;
1067         default:
1068                 ai->ai_protocol = 0;
1069                 break;
1070         }
1071         ai->ai_addrlen = sizeof(struct sockaddr_in);
1072         if (hints && (hints->ai_flags & AI_CANONNAME))
1073                 ai->ai_canonname = h ? strdup(h->h_name) : NULL;
1074         else
1075                 ai->ai_canonname = NULL;
1076
1077         sin = xmalloc(ai->ai_addrlen);
1078         memset(sin, 0, ai->ai_addrlen);
1079         sin->sin_family = AF_INET;
1080         /* Note: getaddrinfo is supposed to allow service to be a string,
1081          * which should be looked up using getservbyname. This is
1082          * currently not implemented */
1083         if (service)
1084                 sin->sin_port = htons(atoi(service));
1085         if (h)
1086                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1087         else if (hints && (hints->ai_flags & AI_PASSIVE))
1088                 sin->sin_addr.s_addr = INADDR_ANY;
1089         else
1090                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1091         ai->ai_addr = (struct sockaddr *)sin;
1092         ai->ai_next = 0;
1093         return 0;
1094 }
1095
1096 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1097 {
1098         free(res->ai_canonname);
1099         free(res->ai_addr);
1100         free(res);
1101 }
1102
1103 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1104                                    char *host, DWORD hostlen,
1105                                    char *serv, DWORD servlen, int flags)
1106 {
1107         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1108         if (sa->sa_family != AF_INET)
1109                 return EAI_FAMILY;
1110         if (!host && !serv)
1111                 return EAI_NONAME;
1112
1113         if (host && hostlen > 0) {
1114                 struct hostent *ent = NULL;
1115                 if (!(flags & NI_NUMERICHOST))
1116                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1117                                             sizeof(sin->sin_addr), AF_INET);
1118
1119                 if (ent)
1120                         snprintf(host, hostlen, "%s", ent->h_name);
1121                 else if (flags & NI_NAMEREQD)
1122                         return EAI_NONAME;
1123                 else
1124                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1125         }
1126
1127         if (serv && servlen > 0) {
1128                 struct servent *ent = NULL;
1129                 if (!(flags & NI_NUMERICSERV))
1130                         ent = getservbyport(sin->sin_port,
1131                                             flags & NI_DGRAM ? "udp" : "tcp");
1132
1133                 if (ent)
1134                         snprintf(serv, servlen, "%s", ent->s_name);
1135                 else
1136                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1137         }
1138
1139         return 0;
1140 }
1141
1142 static HMODULE ipv6_dll = NULL;
1143 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1144 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1145                                       const struct addrinfo *hints,
1146                                       struct addrinfo **res);
1147 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1148                                       char *host, DWORD hostlen,
1149                                       char *serv, DWORD servlen, int flags);
1150 /*
1151  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1152  * don't need to try to load that one dynamically.
1153  */
1154
1155 static void socket_cleanup(void)
1156 {
1157         WSACleanup();
1158         if (ipv6_dll)
1159                 FreeLibrary(ipv6_dll);
1160         ipv6_dll = NULL;
1161         ipv6_freeaddrinfo = freeaddrinfo_stub;
1162         ipv6_getaddrinfo = getaddrinfo_stub;
1163         ipv6_getnameinfo = getnameinfo_stub;
1164 }
1165
1166 static void ensure_socket_initialization(void)
1167 {
1168         WSADATA wsa;
1169         static int initialized = 0;
1170         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1171         const char **name;
1172
1173         if (initialized)
1174                 return;
1175
1176         if (WSAStartup(MAKEWORD(2,2), &wsa))
1177                 die("unable to initialize winsock subsystem, error %d",
1178                         WSAGetLastError());
1179
1180         for (name = libraries; *name; name++) {
1181                 ipv6_dll = LoadLibrary(*name);
1182                 if (!ipv6_dll)
1183                         continue;
1184
1185                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1186                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1187                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1188                                                    const struct addrinfo *,
1189                                                    struct addrinfo **))
1190                         GetProcAddress(ipv6_dll, "getaddrinfo");
1191                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1192                                                    socklen_t, char *, DWORD,
1193                                                    char *, DWORD, int))
1194                         GetProcAddress(ipv6_dll, "getnameinfo");
1195                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1196                         FreeLibrary(ipv6_dll);
1197                         ipv6_dll = NULL;
1198                 } else
1199                         break;
1200         }
1201         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1202                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1203                 ipv6_getaddrinfo = getaddrinfo_stub;
1204                 ipv6_getnameinfo = getnameinfo_stub;
1205         }
1206
1207         atexit(socket_cleanup);
1208         initialized = 1;
1209 }
1210
1211 #undef gethostbyname
1212 struct hostent *mingw_gethostbyname(const char *host)
1213 {
1214         ensure_socket_initialization();
1215         return gethostbyname(host);
1216 }
1217
1218 void mingw_freeaddrinfo(struct addrinfo *res)
1219 {
1220         ipv6_freeaddrinfo(res);
1221 }
1222
1223 int mingw_getaddrinfo(const char *node, const char *service,
1224                       const struct addrinfo *hints, struct addrinfo **res)
1225 {
1226         ensure_socket_initialization();
1227         return ipv6_getaddrinfo(node, service, hints, res);
1228 }
1229
1230 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1231                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1232                       int flags)
1233 {
1234         ensure_socket_initialization();
1235         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1236 }
1237
1238 int mingw_socket(int domain, int type, int protocol)
1239 {
1240         int sockfd;
1241         SOCKET s;
1242
1243         ensure_socket_initialization();
1244         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1245         if (s == INVALID_SOCKET) {
1246                 /*
1247                  * WSAGetLastError() values are regular BSD error codes
1248                  * biased by WSABASEERR.
1249                  * However, strerror() does not know about networking
1250                  * specific errors, which are values beginning at 38 or so.
1251                  * Therefore, we choose to leave the biased error code
1252                  * in errno so that _if_ someone looks up the code somewhere,
1253                  * then it is at least the number that are usually listed.
1254                  */
1255                 errno = WSAGetLastError();
1256                 return -1;
1257         }
1258         /* convert into a file descriptor */
1259         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1260                 closesocket(s);
1261                 return error("unable to make a socket file descriptor: %s",
1262                         strerror(errno));
1263         }
1264         return sockfd;
1265 }
1266
1267 #undef connect
1268 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1269 {
1270         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1271         return connect(s, sa, sz);
1272 }
1273
1274 #undef bind
1275 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1276 {
1277         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1278         return bind(s, sa, sz);
1279 }
1280
1281 #undef setsockopt
1282 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1283 {
1284         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1285         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1286 }
1287
1288 #undef listen
1289 int mingw_listen(int sockfd, int backlog)
1290 {
1291         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1292         return listen(s, backlog);
1293 }
1294
1295 #undef accept
1296 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1297 {
1298         int sockfd2;
1299
1300         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1301         SOCKET s2 = accept(s1, sa, sz);
1302
1303         /* convert into a file descriptor */
1304         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1305                 int err = errno;
1306                 closesocket(s2);
1307                 return error("unable to make a socket file descriptor: %s",
1308                         strerror(err));
1309         }
1310         return sockfd2;
1311 }
1312
1313 #undef rename
1314 int mingw_rename(const char *pold, const char *pnew)
1315 {
1316         DWORD attrs, gle;
1317         int tries = 0;
1318         static const int delay[] = { 0, 1, 10, 20, 40 };
1319
1320         /*
1321          * Try native rename() first to get errno right.
1322          * It is based on MoveFile(), which cannot overwrite existing files.
1323          */
1324         if (!rename(pold, pnew))
1325                 return 0;
1326         if (errno != EEXIST)
1327                 return -1;
1328 repeat:
1329         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1330                 return 0;
1331         /* TODO: translate more errors */
1332         gle = GetLastError();
1333         if (gle == ERROR_ACCESS_DENIED &&
1334             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1335                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1336                         errno = EISDIR;
1337                         return -1;
1338                 }
1339                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1340                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1341                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1342                                 return 0;
1343                         gle = GetLastError();
1344                         /* revert file attributes on failure */
1345                         SetFileAttributes(pnew, attrs);
1346                 }
1347         }
1348         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1349                 /*
1350                  * We assume that some other process had the source or
1351                  * destination file open at the wrong moment and retry.
1352                  * In order to give the other process a higher chance to
1353                  * complete its operation, we give up our time slice now.
1354                  * If we have to retry again, we do sleep a bit.
1355                  */
1356                 Sleep(delay[tries]);
1357                 tries++;
1358                 goto repeat;
1359         }
1360         errno = EACCES;
1361         return -1;
1362 }
1363
1364 /*
1365  * Note that this doesn't return the actual pagesize, but
1366  * the allocation granularity. If future Windows specific git code
1367  * needs the real getpagesize function, we need to find another solution.
1368  */
1369 int mingw_getpagesize(void)
1370 {
1371         SYSTEM_INFO si;
1372         GetSystemInfo(&si);
1373         return si.dwAllocationGranularity;
1374 }
1375
1376 struct passwd *getpwuid(int uid)
1377 {
1378         static char user_name[100];
1379         static struct passwd p;
1380
1381         DWORD len = sizeof(user_name);
1382         if (!GetUserName(user_name, &len))
1383                 return NULL;
1384         p.pw_name = user_name;
1385         p.pw_gecos = "unknown";
1386         p.pw_dir = NULL;
1387         return &p;
1388 }
1389
1390 static HANDLE timer_event;
1391 static HANDLE timer_thread;
1392 static int timer_interval;
1393 static int one_shot;
1394 static sig_handler_t timer_fn = SIG_DFL;
1395
1396 /* The timer works like this:
1397  * The thread, ticktack(), is a trivial routine that most of the time
1398  * only waits to receive the signal to terminate. The main thread tells
1399  * the thread to terminate by setting the timer_event to the signalled
1400  * state.
1401  * But ticktack() interrupts the wait state after the timer's interval
1402  * length to call the signal handler.
1403  */
1404
1405 static unsigned __stdcall ticktack(void *dummy)
1406 {
1407         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1408                 if (timer_fn == SIG_DFL)
1409                         die("Alarm");
1410                 if (timer_fn != SIG_IGN)
1411                         timer_fn(SIGALRM);
1412                 if (one_shot)
1413                         break;
1414         }
1415         return 0;
1416 }
1417
1418 static int start_timer_thread(void)
1419 {
1420         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1421         if (timer_event) {
1422                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1423                 if (!timer_thread )
1424                         return errno = ENOMEM,
1425                                 error("cannot start timer thread");
1426         } else
1427                 return errno = ENOMEM,
1428                         error("cannot allocate resources for timer");
1429         return 0;
1430 }
1431
1432 static void stop_timer_thread(void)
1433 {
1434         if (timer_event)
1435                 SetEvent(timer_event);  /* tell thread to terminate */
1436         if (timer_thread) {
1437                 int rc = WaitForSingleObject(timer_thread, 1000);
1438                 if (rc == WAIT_TIMEOUT)
1439                         error("timer thread did not terminate timely");
1440                 else if (rc != WAIT_OBJECT_0)
1441                         error("waiting for timer thread failed: %lu",
1442                               GetLastError());
1443                 CloseHandle(timer_thread);
1444         }
1445         if (timer_event)
1446                 CloseHandle(timer_event);
1447         timer_event = NULL;
1448         timer_thread = NULL;
1449 }
1450
1451 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1452 {
1453         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1454 }
1455
1456 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1457 {
1458         static const struct timeval zero;
1459         static int atexit_done;
1460
1461         if (out != NULL)
1462                 return errno = EINVAL,
1463                         error("setitimer param 3 != NULL not implemented");
1464         if (!is_timeval_eq(&in->it_interval, &zero) &&
1465             !is_timeval_eq(&in->it_interval, &in->it_value))
1466                 return errno = EINVAL,
1467                         error("setitimer: it_interval must be zero or eq it_value");
1468
1469         if (timer_thread)
1470                 stop_timer_thread();
1471
1472         if (is_timeval_eq(&in->it_value, &zero) &&
1473             is_timeval_eq(&in->it_interval, &zero))
1474                 return 0;
1475
1476         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1477         one_shot = is_timeval_eq(&in->it_interval, &zero);
1478         if (!atexit_done) {
1479                 atexit(stop_timer_thread);
1480                 atexit_done = 1;
1481         }
1482         return start_timer_thread();
1483 }
1484
1485 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1486 {
1487         if (sig != SIGALRM)
1488                 return errno = EINVAL,
1489                         error("sigaction only implemented for SIGALRM");
1490         if (out != NULL)
1491                 return errno = EINVAL,
1492                         error("sigaction: param 3 != NULL not implemented");
1493
1494         timer_fn = in->sa_handler;
1495         return 0;
1496 }
1497
1498 #undef signal
1499 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1500 {
1501         sig_handler_t old = timer_fn;
1502         if (sig != SIGALRM)
1503                 return signal(sig, handler);
1504         timer_fn = handler;
1505         return old;
1506 }
1507
1508 static const char *make_backslash_path(const char *path)
1509 {
1510         static char buf[PATH_MAX + 1];
1511         char *c;
1512
1513         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1514                 die("Too long path: %.*s", 60, path);
1515
1516         for (c = buf; *c; c++) {
1517                 if (*c == '/')
1518                         *c = '\\';
1519         }
1520         return buf;
1521 }
1522
1523 void mingw_open_html(const char *unixpath)
1524 {
1525         const char *htmlpath = make_backslash_path(unixpath);
1526         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1527                         const char *, const char *, const char *, INT);
1528         T ShellExecute;
1529         HMODULE shell32;
1530         int r;
1531
1532         shell32 = LoadLibrary("shell32.dll");
1533         if (!shell32)
1534                 die("cannot load shell32.dll");
1535         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1536         if (!ShellExecute)
1537                 die("cannot run browser");
1538
1539         printf("Launching default browser to display HTML ...\n");
1540         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1541         FreeLibrary(shell32);
1542         /* see the MSDN documentation referring to the result codes here */
1543         if (r <= 32) {
1544                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1545         }
1546 }
1547
1548 int link(const char *oldpath, const char *newpath)
1549 {
1550         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1551         static T create_hard_link = NULL;
1552         if (!create_hard_link) {
1553                 create_hard_link = (T) GetProcAddress(
1554                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1555                 if (!create_hard_link)
1556                         create_hard_link = (T)-1;
1557         }
1558         if (create_hard_link == (T)-1) {
1559                 errno = ENOSYS;
1560                 return -1;
1561         }
1562         if (!create_hard_link(newpath, oldpath, NULL)) {
1563                 errno = err_win_to_posix(GetLastError());
1564                 return -1;
1565         }
1566         return 0;
1567 }
1568
1569 char *getpass(const char *prompt)
1570 {
1571         struct strbuf buf = STRBUF_INIT;
1572
1573         fputs(prompt, stderr);
1574         for (;;) {
1575                 char c = _getch();
1576                 if (c == '\r' || c == '\n')
1577                         break;
1578                 strbuf_addch(&buf, c);
1579         }
1580         fputs("\n", stderr);
1581         return strbuf_detach(&buf, NULL);
1582 }
1583
1584 pid_t waitpid(pid_t pid, int *status, unsigned options)
1585 {
1586         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1587             FALSE, pid);
1588         if (!h) {
1589                 errno = ECHILD;
1590                 return -1;
1591         }
1592
1593         if (pid > 0 && options & WNOHANG) {
1594                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1595                         CloseHandle(h);
1596                         return 0;
1597                 }
1598                 options &= ~WNOHANG;
1599         }
1600
1601         if (options == 0) {
1602                 struct pinfo_t **ppinfo;
1603                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1604                         CloseHandle(h);
1605                         return 0;
1606                 }
1607
1608                 if (status)
1609                         GetExitCodeProcess(h, (LPDWORD)status);
1610
1611                 EnterCriticalSection(&pinfo_cs);
1612
1613                 ppinfo = &pinfo;
1614                 while (*ppinfo) {
1615                         struct pinfo_t *info = *ppinfo;
1616                         if (info->pid == pid) {
1617                                 CloseHandle(info->proc);
1618                                 *ppinfo = info->next;
1619                                 free(info);
1620                                 break;
1621                         }
1622                         ppinfo = &info->next;
1623                 }
1624
1625                 LeaveCriticalSection(&pinfo_cs);
1626
1627                 CloseHandle(h);
1628                 return pid;
1629         }
1630         CloseHandle(h);
1631
1632         errno = EINVAL;
1633         return -1;
1634 }