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 unlink
 159 int mingw_unlink(const char *pathname)
 160 {
 161         /* read-only files cannot be removed */
 162         chmod(pathname, 0666);
 163         return unlink(pathname);
 164 }
 165
 166 #undef open
 167 int mingw_open (const char *filename, int oflags, ...)
 168 {
 169         va_list args;
 170         unsigned mode;
 171         int fd;
 172
 173         va_start(args, oflags);
 174         mode = va_arg(args, int);
 175         va_end(args);
 176
 177         if (filename && !strcmp(filename, "/dev/null"))
 178                 filename = "nul";
 179
 180         fd = open(filename, oflags, mode);
 181
 182         if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 183                 DWORD attrs = GetFileAttributes(filename);
 184                 if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 185                         errno = EISDIR;
 186         }
 187         if ((oflags & O_CREAT) && fd >= 0 &&
 188             hide_dotfiles == HIDE_DOTFILES_TRUE) {
 189                 /*
 190                  * In Windows a file or dir starting with a dot is not
 191                  * automatically hidden. So lets mark it as hidden when
 192                  * such a file is created.
 193                  */
 194                 const char *start = basename((char*)filename);
 195                 if (*start == '.' && make_hidden(filename))
 196                         warning("Could not mark '%s' as hidden.", filename);
 197         }
 198         return fd;
 199 }
 200
 201 #undef write
 202 ssize_t mingw_write(int fd, const void *buf, size_t count)
 203 {
 204         /*
 205          * While write() calls to a file on a local disk are translated
 206          * into WriteFile() calls with a maximum size of 64KB on Windows
 207          * XP and 256KB on Vista, no such cap is placed on writes to
 208          * files over the network on Windows XP.  Unfortunately, there
 209          * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 210          * bigger writes fail on Windows XP.
 211          * So we cap to a nice 31MB here to avoid write failures over
 212          * the net without changing the number of WriteFile() calls in
 213          * the local case.
 214          */
 215         return write(fd, buf, min(count, 31 * 1024 * 1024));
 216 }
 217
 218 #undef fopen
 219 FILE *mingw_fopen (const char *filename, const char *otype)
 220 {
 221         int hide = 0;
 222         FILE *file;
 223         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 224             basename((char*)filename)[0] == '.')
 225                 hide = access(filename, F_OK);
 226         if (filename && !strcmp(filename, "/dev/null"))
 227                 filename = "nul";
 228         file = fopen(filename, otype);
 229         if (file && hide && make_hidden(filename))
 230                 warning("Could not mark '%s' as hidden.", filename);
 231         return file;
 232 }
 233
 234 #undef freopen
 235 FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 236 {
 237         int hide = 0;
 238         FILE *file;
 239         if (hide_dotfiles == HIDE_DOTFILES_TRUE &&
 240             basename((char*)filename)[0] == '.')
 241                 hide = access(filename, F_OK);
 242         if (filename && !strcmp(filename, "/dev/null"))
 243                 filename = "nul";
 244         file = freopen(filename, otype, stream);
 245         if (file && hide && make_hidden(filename))
 246                 warning("Could not mark '%s' as hidden.", filename);
 247         return file;
 248 }
 249
 250 /*
 251  * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 252  * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 253  */
 254 static inline long long filetime_to_hnsec(const FILETIME *ft)
 255 {
 256         long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 257         /* Windows to Unix Epoch conversion */
 258         return winTime - 116444736000000000LL;
 259 }
 260
 261 static inline time_t filetime_to_time_t(const FILETIME *ft)
 262 {
 263         return (time_t)(filetime_to_hnsec(ft) / 10000000);
 264 }
 265
 266 /* We keep the do_lstat code in a separate function to avoid recursion.
 267  * When a path ends with a slash, the stat will fail with ENOENT. In
 268  * this case, we strip the trailing slashes and stat again.
 269  *
 270  * If follow is true then act like stat() and report on the link
 271  * target. Otherwise report on the link itself.
 272  */
 273 static int do_lstat(int follow, const char *file_name, struct stat *buf)
 274 {
 275         int err;
 276         WIN32_FILE_ATTRIBUTE_DATA fdata;
 277
 278         if (!(err = get_file_attr(file_name, &fdata))) {
 279                 buf->st_ino = 0;
 280                 buf->st_gid = 0;
 281                 buf->st_uid = 0;
 282                 buf->st_nlink = 1;
 283                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 284                 buf->st_size = fdata.nFileSizeLow |
 285                         (((off_t)fdata.nFileSizeHigh)<<32);
 286                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 287                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 288                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 289                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 290                 if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 291                         WIN32_FIND_DATAA findbuf;
 292                         HANDLE handle = FindFirstFileA(file_name, &findbuf);
 293                         if (handle != INVALID_HANDLE_VALUE) {
 294                                 if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 295                                                 (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 296                                         if (follow) {
 297                                                 char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 298                                                 buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 299                                         } else {
 300                                                 buf->st_mode = S_IFLNK;
 301                                         }
 302                                         buf->st_mode |= S_IREAD;
 303                                         if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 304                                                 buf->st_mode |= S_IWRITE;
 305                                 }
 306                                 FindClose(handle);
 307                         }
 308                 }
 309                 return 0;
 310         }
 311         errno = err;
 312         return -1;
 313 }
 314
 315 /* We provide our own lstat/fstat functions, since the provided
 316  * lstat/fstat functions are so slow. These stat functions are
 317  * tailored for Git's usage (read: fast), and are not meant to be
 318  * complete. Note that Git stat()s are redirected to mingw_lstat()
 319  * too, since Windows doesn't really handle symlinks that well.
 320  */
 321 static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 322 {
 323         int namelen;
 324         static char alt_name[PATH_MAX];
 325
 326         if (!do_lstat(follow, file_name, buf))
 327                 return 0;
 328
 329         /* if file_name ended in a '/', Windows returned ENOENT;
 330          * try again without trailing slashes
 331          */
 332         if (errno != ENOENT)
 333                 return -1;
 334
 335         namelen = strlen(file_name);
 336         if (namelen && file_name[namelen-1] != '/')
 337                 return -1;
 338         while (namelen && file_name[namelen-1] == '/')
 339                 --namelen;
 340         if (!namelen || namelen >= PATH_MAX)
 341                 return -1;
 342
 343         memcpy(alt_name, file_name, namelen);
 344         alt_name[namelen] = 0;
 345         return do_lstat(follow, alt_name, buf);
 346 }
 347
 348 int mingw_lstat(const char *file_name, struct stat *buf)
 349 {
 350         return do_stat_internal(0, file_name, buf);
 351 }
 352 int mingw_stat(const char *file_name, struct stat *buf)
 353 {
 354         return do_stat_internal(1, file_name, buf);
 355 }
 356
 357 #undef fstat
 358 int mingw_fstat(int fd, struct stat *buf)
 359 {
 360         HANDLE fh = (HANDLE)_get_osfhandle(fd);
 361         BY_HANDLE_FILE_INFORMATION fdata;
 362
 363         if (fh == INVALID_HANDLE_VALUE) {
 364                 errno = EBADF;
 365                 return -1;
 366         }
 367         /* direct non-file handles to MS's fstat() */
 368         if (GetFileType(fh) != FILE_TYPE_DISK)
 369                 return _fstati64(fd, buf);
 370
 371         if (GetFileInformationByHandle(fh, &fdata)) {
 372                 buf->st_ino = 0;
 373                 buf->st_gid = 0;
 374                 buf->st_uid = 0;
 375                 buf->st_nlink = 1;
 376                 buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 377                 buf->st_size = fdata.nFileSizeLow |
 378                         (((off_t)fdata.nFileSizeHigh)<<32);
 379                 buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 380                 buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 381                 buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 382                 buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 383                 return 0;
 384         }
 385         errno = EBADF;
 386         return -1;
 387 }
 388
 389 static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 390 {
 391         long long winTime = t * 10000000LL + 116444736000000000LL;
 392         ft->dwLowDateTime = winTime;
 393         ft->dwHighDateTime = winTime >> 32;
 394 }
 395
 396 int mingw_utime (const char *file_name, const struct utimbuf *times)
 397 {
 398         FILETIME mft, aft;
 399         int fh, rc;
 400
 401         /* must have write permission */
 402         DWORD attrs = GetFileAttributes(file_name);
 403         if (attrs != INVALID_FILE_ATTRIBUTES &&
 404             (attrs & FILE_ATTRIBUTE_READONLY)) {
 405                 /* ignore errors here; open() will report them */
 406                 SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 407         }
 408
 409         if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 410                 rc = -1;
 411                 goto revert_attrs;
 412         }
 413
 414         if (times) {
 415                 time_t_to_filetime(times->modtime, &mft);
 416                 time_t_to_filetime(times->actime, &aft);
 417         } else {
 418                 GetSystemTimeAsFileTime(&mft);
 419                 aft = mft;
 420         }
 421         if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 422                 errno = EINVAL;
 423                 rc = -1;
 424         } else
 425                 rc = 0;
 426         close(fh);
 427
 428 revert_attrs:
 429         if (attrs != INVALID_FILE_ATTRIBUTES &&
 430             (attrs & FILE_ATTRIBUTE_READONLY)) {
 431                 /* ignore errors again */
 432                 SetFileAttributes(file_name, attrs);
 433         }
 434         return rc;
 435 }
 436
 437 unsigned int sleep (unsigned int seconds)
 438 {
 439         Sleep(seconds*1000);
 440         return 0;
 441 }
 442
 443 int mkstemp(char *template)
 444 {
 445         char *filename = mktemp(template);
 446         if (filename == NULL)
 447                 return -1;
 448         return open(filename, O_RDWR | O_CREAT, 0600);
 449 }
 450
 451 int gettimeofday(struct timeval *tv, void *tz)
 452 {
 453         FILETIME ft;
 454         long long hnsec;
 455
 456         GetSystemTimeAsFileTime(&ft);
 457         hnsec = filetime_to_hnsec(&ft);
 458         tv->tv_sec = hnsec / 10000000;
 459         tv->tv_usec = (hnsec % 10000000) / 10;
 460         return 0;
 461 }
 462
 463 int pipe(int filedes[2])
 464 {
 465         HANDLE h[2];
 466
 467         /* this creates non-inheritable handles */
 468         if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 469                 errno = err_win_to_posix(GetLastError());
 470                 return -1;
 471         }
 472         filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 473         if (filedes[0] < 0) {
 474                 CloseHandle(h[0]);
 475                 CloseHandle(h[1]);
 476                 return -1;
 477         }
 478         filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 479         if (filedes[0] < 0) {
 480                 close(filedes[0]);
 481                 CloseHandle(h[1]);
 482                 return -1;
 483         }
 484         return 0;
 485 }
 486
 487 struct tm *gmtime_r(const time_t *timep, struct tm *result)
 488 {
 489         /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 490         memcpy(result, gmtime(timep), sizeof(struct tm));
 491         return result;
 492 }
 493
 494 struct tm *localtime_r(const time_t *timep, struct tm *result)
 495 {
 496         /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 497         memcpy(result, localtime(timep), sizeof(struct tm));
 498         return result;
 499 }
 500
 501 #undef getcwd
 502 char *mingw_getcwd(char *pointer, int len)
 503 {
 504         int i;
 505         char *ret = getcwd(pointer, len);
 506         if (!ret)
 507                 return ret;
 508         for (i = 0; pointer[i]; i++)
 509                 if (pointer[i] == '\\')
 510                         pointer[i] = '/';
 511         return ret;
 512 }
 513
 514 #undef getenv
 515 char *mingw_getenv(const char *name)
 516 {
 517         char *result = getenv(name);
 518         if (!result && !strcmp(name, "TMPDIR")) {
 519                 /* on Windows it is TMP and TEMP */
 520                 result = getenv("TMP");
 521                 if (!result)
 522                         result = getenv("TEMP");
 523         }
 524         return result;
 525 }
 526
 527 /*
 528  * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 529  * (Parsing C++ Command-Line Arguments)
 530  */
 531 static const char *quote_arg(const char *arg)
 532 {
 533         /* count chars to quote */
 534         int len = 0, n = 0;
 535         int force_quotes = 0;
 536         char *q, *d;
 537         const char *p = arg;
 538         if (!*p) force_quotes = 1;
 539         while (*p) {
 540                 if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 541                         force_quotes = 1;
 542                 else if (*p == '"')
 543                         n++;
 544                 else if (*p == '\\') {
 545                         int count = 0;
 546                         while (*p == '\\') {
 547                                 count++;
 548                                 p++;
 549                                 len++;
 550                         }
 551                         if (*p == '"')
 552                                 n += count*2 + 1;
 553                         continue;
 554                 }
 555                 len++;
 556                 p++;
 557         }
 558         if (!force_quotes && n == 0)
 559                 return arg;
 560
 561         /* insert \ where necessary */
 562         d = q = xmalloc(len+n+3);
 563         *d++ = '"';
 564         while (*arg) {
 565                 if (*arg == '"')
 566                         *d++ = '\\';
 567                 else if (*arg == '\\') {
 568                         int count = 0;
 569                         while (*arg == '\\') {
 570                                 count++;
 571                                 *d++ = *arg++;
 572                         }
 573                         if (*arg == '"') {
 574                                 while (count-- > 0)
 575                                         *d++ = '\\';
 576                                 *d++ = '\\';
 577                         }
 578                 }
 579                 *d++ = *arg++;
 580         }
 581         *d++ = '"';
 582         *d++ = 0;
 583         return q;
 584 }
 585
 586 static const char *parse_interpreter(const char *cmd)
 587 {
 588         static char buf[100];
 589         char *p, *opt;
 590         int n, fd;
 591
 592         /* don't even try a .exe */
 593         n = strlen(cmd);
 594         if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 595                 return NULL;
 596
 597         fd = open(cmd, O_RDONLY);
 598         if (fd < 0)
 599                 return NULL;
 600         n = read(fd, buf, sizeof(buf)-1);
 601         close(fd);
 602         if (n < 4)      /* at least '#!/x' and not error */
 603                 return NULL;
 604
 605         if (buf[0] != '#' || buf[1] != '!')
 606                 return NULL;
 607         buf[n] = '\0';
 608         p = buf + strcspn(buf, "\r\n");
 609         if (!*p)
 610                 return NULL;
 611
 612         *p = '\0';
 613         if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 614                 return NULL;
 615         /* strip options */
 616         if ((opt = strchr(p+1, ' ')))
 617                 *opt = '\0';
 618         return p+1;
 619 }
 620
 621 /*
 622  * Splits the PATH into parts.
 623  */
 624 static char **get_path_split(void)
 625 {
 626         char *p, **path, *envpath = getenv("PATH");
 627         int i, n = 0;
 628
 629         if (!envpath || !*envpath)
 630                 return NULL;
 631
 632         envpath = xstrdup(envpath);
 633         p = envpath;
 634         while (p) {
 635                 char *dir = p;
 636                 p = strchr(p, ';');
 637                 if (p) *p++ = '\0';
 638                 if (*dir) {     /* not earlier, catches series of ; */
 639                         ++n;
 640                 }
 641         }
 642         if (!n)
 643                 return NULL;
 644
 645         path = xmalloc((n+1)*sizeof(char *));
 646         p = envpath;
 647         i = 0;
 648         do {
 649                 if (*p)
 650                         path[i++] = xstrdup(p);
 651                 p = p+strlen(p)+1;
 652         } while (i < n);
 653         path[i] = NULL;
 654
 655         free(envpath);
 656
 657         return path;
 658 }
 659
 660 static void free_path_split(char **path)
 661 {
 662         char **p = path;
 663
 664         if (!path)
 665                 return;
 666
 667         while (*p)
 668                 free(*p++);
 669         free(path);
 670 }
 671
 672 /*
 673  * exe_only means that we only want to detect .exe files, but not scripts
 674  * (which do not have an extension)
 675  */
 676 static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 677 {
 678         char path[MAX_PATH];
 679         snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 680
 681         if (!isexe && access(path, F_OK) == 0)
 682                 return xstrdup(path);
 683         path[strlen(path)-4] = '\0';
 684         if ((!exe_only || isexe) && access(path, F_OK) == 0)
 685                 if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 686                         return xstrdup(path);
 687         return NULL;
 688 }
 689
 690 /*
 691  * Determines the absolute path of cmd using the split path in path.
 692  * If cmd contains a slash or backslash, no lookup is performed.
 693  */
 694 static char *path_lookup(const char *cmd, char **path, int exe_only)
 695 {
 696         char *prog = NULL;
 697         int len = strlen(cmd);
 698         int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 699
 700         if (strchr(cmd, '/') || strchr(cmd, '\\'))
 701                 prog = xstrdup(cmd);
 702
 703         while (!prog && *path)
 704                 prog = lookup_prog(*path++, cmd, isexe, exe_only);
 705
 706         return prog;
 707 }
 708
 709 static int env_compare(const void *a, const void *b)
 710 {
 711         char *const *ea = a;
 712         char *const *eb = b;
 713         return strcasecmp(*ea, *eb);
 714 }
 715
 716 struct pinfo_t {
 717         struct pinfo_t *next;
 718         pid_t pid;
 719         HANDLE proc;
 720 } pinfo_t;
 721 struct pinfo_t *pinfo = NULL;
 722 CRITICAL_SECTION pinfo_cs;
 723
 724 static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 725                               const char *dir,
 726                               int prepend_cmd, int fhin, int fhout, int fherr)
 727 {
 728         STARTUPINFO si;
 729         PROCESS_INFORMATION pi;
 730         struct strbuf envblk, args;
 731         unsigned flags;
 732         BOOL ret;
 733
 734         /* Determine whether or not we are associated to a console */
 735         HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 736                         FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 737                         FILE_ATTRIBUTE_NORMAL, NULL);
 738         if (cons == INVALID_HANDLE_VALUE) {
 739                 /* There is no console associated with this process.
 740                  * Since the child is a console process, Windows
 741                  * would normally create a console window. But
 742                  * since we'll be redirecting std streams, we do
 743                  * not need the console.
 744                  * It is necessary to use DETACHED_PROCESS
 745                  * instead of CREATE_NO_WINDOW to make ssh
 746                  * recognize that it has no console.
 747                  */
 748                 flags = DETACHED_PROCESS;
 749         } else {
 750                 /* There is already a console. If we specified
 751                  * DETACHED_PROCESS here, too, Windows would
 752                  * disassociate the child from the console.
 753                  * The same is true for CREATE_NO_WINDOW.
 754                  * Go figure!
 755                  */
 756                 flags = 0;
 757                 CloseHandle(cons);
 758         }
 759         memset(&si, 0, sizeof(si));
 760         si.cb = sizeof(si);
 761         si.dwFlags = STARTF_USESTDHANDLES;
 762         si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 763         si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 764         si.hStdError = (HANDLE) _get_osfhandle(fherr);
 765
 766         /* concatenate argv, quoting args as we go */
 767         strbuf_init(&args, 0);
 768         if (prepend_cmd) {
 769                 char *quoted = (char *)quote_arg(cmd);
 770                 strbuf_addstr(&args, quoted);
 771                 if (quoted != cmd)
 772                         free(quoted);
 773         }
 774         for (; *argv; argv++) {
 775                 char *quoted = (char *)quote_arg(*argv);
 776                 if (*args.buf)
 777                         strbuf_addch(&args, ' ');
 778                 strbuf_addstr(&args, quoted);
 779                 if (quoted != *argv)
 780                         free(quoted);
 781         }
 782
 783         if (env) {
 784                 int count = 0;
 785                 char **e, **sorted_env;
 786
 787                 for (e = env; *e; e++)
 788                         count++;
 789
 790                 /* environment must be sorted */
 791                 sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 792                 memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 793                 qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 794
 795                 strbuf_init(&envblk, 0);
 796                 for (e = sorted_env; *e; e++) {
 797                         strbuf_addstr(&envblk, *e);
 798                         strbuf_addch(&envblk, '\0');
 799                 }
 800                 free(sorted_env);
 801         }
 802
 803         memset(&pi, 0, sizeof(pi));
 804         ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 805                 env ? envblk.buf : NULL, dir, &si, &pi);
 806
 807         if (env)
 808                 strbuf_release(&envblk);
 809         strbuf_release(&args);
 810
 811         if (!ret) {
 812                 errno = ENOENT;
 813                 return -1;
 814         }
 815         CloseHandle(pi.hThread);
 816
 817         /*
 818          * The process ID is the human-readable identifier of the process
 819          * that we want to present in log and error messages. The handle
 820          * is not useful for this purpose. But we cannot close it, either,
 821          * because it is not possible to turn a process ID into a process
 822          * handle after the process terminated.
 823          * Keep the handle in a list for waitpid.
 824          */
 825         EnterCriticalSection(&pinfo_cs);
 826         {
 827                 struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 828                 info->pid = pi.dwProcessId;
 829                 info->proc = pi.hProcess;
 830                 info->next = pinfo;
 831                 pinfo = info;
 832         }
 833         LeaveCriticalSection(&pinfo_cs);
 834
 835         return (pid_t)pi.dwProcessId;
 836 }
 837
 838 static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 839                            int prepend_cmd)
 840 {
 841         return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 842 }
 843
 844 pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 845                      const char *dir,
 846                      int fhin, int fhout, int fherr)
 847 {
 848         pid_t pid;
 849         char **path = get_path_split();
 850         char *prog = path_lookup(cmd, path, 0);
 851
 852         if (!prog) {
 853                 errno = ENOENT;
 854                 pid = -1;
 855         }
 856         else {
 857                 const char *interpr = parse_interpreter(prog);
 858
 859                 if (interpr) {
 860                         const char *argv0 = argv[0];
 861                         char *iprog = path_lookup(interpr, path, 1);
 862                         argv[0] = prog;
 863                         if (!iprog) {
 864                                 errno = ENOENT;
 865                                 pid = -1;
 866                         }
 867                         else {
 868                                 pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 869                                                        fhin, fhout, fherr);
 870                                 free(iprog);
 871                         }
 872                         argv[0] = argv0;
 873                 }
 874                 else
 875                         pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 876                                                fhin, fhout, fherr);
 877                 free(prog);
 878         }
 879         free_path_split(path);
 880         return pid;
 881 }
 882
 883 static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 884 {
 885         const char *interpr = parse_interpreter(cmd);
 886         char **path;
 887         char *prog;
 888         int pid = 0;
 889
 890         if (!interpr)
 891                 return 0;
 892         path = get_path_split();
 893         prog = path_lookup(interpr, path, 1);
 894         if (prog) {
 895                 int argc = 0;
 896                 const char **argv2;
 897                 while (argv[argc]) argc++;
 898                 argv2 = xmalloc(sizeof(*argv) * (argc+1));
 899                 argv2[0] = (char *)cmd; /* full path to the script file */
 900                 memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 901                 pid = mingw_spawnve(prog, argv2, env, 1);
 902                 if (pid >= 0) {
 903                         int status;
 904                         if (waitpid(pid, &status, 0) < 0)
 905                                 status = 255;
 906                         exit(status);
 907                 }
 908                 pid = 1;        /* indicate that we tried but failed */
 909                 free(prog);
 910                 free(argv2);
 911         }
 912         free_path_split(path);
 913         return pid;
 914 }
 915
 916 static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
 917 {
 918         /* check if git_command is a shell script */
 919         if (!try_shell_exec(cmd, argv, (char **)env)) {
 920                 int pid, status;
 921
 922                 pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
 923                 if (pid < 0)
 924                         return;
 925                 if (waitpid(pid, &status, 0) < 0)
 926                         status = 255;
 927                 exit(status);
 928         }
 929 }
 930
 931 void mingw_execvp(const char *cmd, char *const *argv)
 932 {
 933         char **path = get_path_split();
 934         char *prog = path_lookup(cmd, path, 0);
 935
 936         if (prog) {
 937                 mingw_execve(prog, argv, environ);
 938                 free(prog);
 939         } else
 940                 errno = ENOENT;
 941
 942         free_path_split(path);
 943 }
 944
 945 void mingw_execv(const char *cmd, char *const *argv)
 946 {
 947         mingw_execve(cmd, argv, environ);
 948 }
 949
 950 int mingw_kill(pid_t pid, int sig)
 951 {
 952         if (pid > 0 && sig == SIGTERM) {
 953                 HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
 954
 955                 if (TerminateProcess(h, -1)) {
 956                         CloseHandle(h);
 957                         return 0;
 958                 }
 959
 960                 errno = err_win_to_posix(GetLastError());
 961                 CloseHandle(h);
 962                 return -1;
 963         }
 964
 965         errno = EINVAL;
 966         return -1;
 967 }
 968
 969 static char **copy_environ(void)
 970 {
 971         char **env;
 972         int i = 0;
 973         while (environ[i])
 974                 i++;
 975         env = xmalloc((i+1)*sizeof(*env));
 976         for (i = 0; environ[i]; i++)
 977                 env[i] = xstrdup(environ[i]);
 978         env[i] = NULL;
 979         return env;
 980 }
 981
 982 void free_environ(char **env)
 983 {
 984         int i;
 985         for (i = 0; env[i]; i++)
 986                 free(env[i]);
 987         free(env);
 988 }
 989
 990 static int lookup_env(char **env, const char *name, size_t nmln)
 991 {
 992         int i;
 993
 994         for (i = 0; env[i]; i++) {
 995                 if (0 == strncmp(env[i], name, nmln)
 996                     && '=' == env[i][nmln])
 997                         /* matches */
 998                         return i;
 999         }
1000         return -1;
1001 }
1002
1003 /*
1004  * If name contains '=', then sets the variable, otherwise it unsets it
1005  */
1006 static char **env_setenv(char **env, const char *name)
1007 {
1008         char *eq = strchrnul(name, '=');
1009         int i = lookup_env(env, name, eq-name);
1010
1011         if (i < 0) {
1012                 if (*eq) {
1013                         for (i = 0; env[i]; i++)
1014                                 ;
1015                         env = xrealloc(env, (i+2)*sizeof(*env));
1016                         env[i] = xstrdup(name);
1017                         env[i+1] = NULL;
1018                 }
1019         }
1020         else {
1021                 free(env[i]);
1022                 if (*eq)
1023                         env[i] = xstrdup(name);
1024                 else
1025                         for (; env[i]; i++)
1026                                 env[i] = env[i+1];
1027         }
1028         return env;
1029 }
1030
1031 /*
1032  * Copies global environ and adjusts variables as specified by vars.
1033  */
1034 char **make_augmented_environ(const char *const *vars)
1035 {
1036         char **env = copy_environ();
1037
1038         while (*vars)
1039                 env = env_setenv(env, *vars++);
1040         return env;
1041 }
1042
1043 /*
1044  * Note, this isn't a complete replacement for getaddrinfo. It assumes
1045  * that service contains a numerical port, or that it it is null. It
1046  * does a simple search using gethostbyname, and returns one IPv4 host
1047  * if one was found.
1048  */
1049 static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1050                                    const struct addrinfo *hints,
1051                                    struct addrinfo **res)
1052 {
1053         struct hostent *h = NULL;
1054         struct addrinfo *ai;
1055         struct sockaddr_in *sin;
1056
1057         if (node) {
1058                 h = gethostbyname(node);
1059                 if (!h)
1060                         return WSAGetLastError();
1061         }
1062
1063         ai = xmalloc(sizeof(struct addrinfo));
1064         *res = ai;
1065         ai->ai_flags = 0;
1066         ai->ai_family = AF_INET;
1067         ai->ai_socktype = hints ? hints->ai_socktype : 0;
1068         switch (ai->ai_socktype) {
1069         case SOCK_STREAM:
1070                 ai->ai_protocol = IPPROTO_TCP;
1071                 break;
1072         case SOCK_DGRAM:
1073                 ai->ai_protocol = IPPROTO_UDP;
1074                 break;
1075         default:
1076                 ai->ai_protocol = 0;
1077                 break;
1078         }
1079         ai->ai_addrlen = sizeof(struct sockaddr_in);
1080         if (hints && (hints->ai_flags & AI_CANONNAME))
1081                 ai->ai_canonname = h ? strdup(h->h_name) : NULL;
1082         else
1083                 ai->ai_canonname = NULL;
1084
1085         sin = xmalloc(ai->ai_addrlen);
1086         memset(sin, 0, ai->ai_addrlen);
1087         sin->sin_family = AF_INET;
1088         /* Note: getaddrinfo is supposed to allow service to be a string,
1089          * which should be looked up using getservbyname. This is
1090          * currently not implemented */
1091         if (service)
1092                 sin->sin_port = htons(atoi(service));
1093         if (h)
1094                 sin->sin_addr = *(struct in_addr *)h->h_addr;
1095         else if (hints && (hints->ai_flags & AI_PASSIVE))
1096                 sin->sin_addr.s_addr = INADDR_ANY;
1097         else
1098                 sin->sin_addr.s_addr = INADDR_LOOPBACK;
1099         ai->ai_addr = (struct sockaddr *)sin;
1100         ai->ai_next = 0;
1101         return 0;
1102 }
1103
1104 static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1105 {
1106         free(res->ai_canonname);
1107         free(res->ai_addr);
1108         free(res);
1109 }
1110
1111 static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1112                                    char *host, DWORD hostlen,
1113                                    char *serv, DWORD servlen, int flags)
1114 {
1115         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1116         if (sa->sa_family != AF_INET)
1117                 return EAI_FAMILY;
1118         if (!host && !serv)
1119                 return EAI_NONAME;
1120
1121         if (host && hostlen > 0) {
1122                 struct hostent *ent = NULL;
1123                 if (!(flags & NI_NUMERICHOST))
1124                         ent = gethostbyaddr((const char *)&sin->sin_addr,
1125                                             sizeof(sin->sin_addr), AF_INET);
1126
1127                 if (ent)
1128                         snprintf(host, hostlen, "%s", ent->h_name);
1129                 else if (flags & NI_NAMEREQD)
1130                         return EAI_NONAME;
1131                 else
1132                         snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1133         }
1134
1135         if (serv && servlen > 0) {
1136                 struct servent *ent = NULL;
1137                 if (!(flags & NI_NUMERICSERV))
1138                         ent = getservbyport(sin->sin_port,
1139                                             flags & NI_DGRAM ? "udp" : "tcp");
1140
1141                 if (ent)
1142                         snprintf(serv, servlen, "%s", ent->s_name);
1143                 else
1144                         snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1145         }
1146
1147         return 0;
1148 }
1149
1150 static HMODULE ipv6_dll = NULL;
1151 static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1152 static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1153                                       const struct addrinfo *hints,
1154                                       struct addrinfo **res);
1155 static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1156                                       char *host, DWORD hostlen,
1157                                       char *serv, DWORD servlen, int flags);
1158 /*
1159  * gai_strerror is an inline function in the ws2tcpip.h header, so we
1160  * don't need to try to load that one dynamically.
1161  */
1162
1163 static void socket_cleanup(void)
1164 {
1165         WSACleanup();
1166         if (ipv6_dll)
1167                 FreeLibrary(ipv6_dll);
1168         ipv6_dll = NULL;
1169         ipv6_freeaddrinfo = freeaddrinfo_stub;
1170         ipv6_getaddrinfo = getaddrinfo_stub;
1171         ipv6_getnameinfo = getnameinfo_stub;
1172 }
1173
1174 static void ensure_socket_initialization(void)
1175 {
1176         WSADATA wsa;
1177         static int initialized = 0;
1178         const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1179         const char **name;
1180
1181         if (initialized)
1182                 return;
1183
1184         if (WSAStartup(MAKEWORD(2,2), &wsa))
1185                 die("unable to initialize winsock subsystem, error %d",
1186                         WSAGetLastError());
1187
1188         for (name = libraries; *name; name++) {
1189                 ipv6_dll = LoadLibrary(*name);
1190                 if (!ipv6_dll)
1191                         continue;
1192
1193                 ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1194                         GetProcAddress(ipv6_dll, "freeaddrinfo");
1195                 ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1196                                                    const struct addrinfo *,
1197                                                    struct addrinfo **))
1198                         GetProcAddress(ipv6_dll, "getaddrinfo");
1199                 ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1200                                                    socklen_t, char *, DWORD,
1201                                                    char *, DWORD, int))
1202                         GetProcAddress(ipv6_dll, "getnameinfo");
1203                 if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1204                         FreeLibrary(ipv6_dll);
1205                         ipv6_dll = NULL;
1206                 } else
1207                         break;
1208         }
1209         if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1210                 ipv6_freeaddrinfo = freeaddrinfo_stub;
1211                 ipv6_getaddrinfo = getaddrinfo_stub;
1212                 ipv6_getnameinfo = getnameinfo_stub;
1213         }
1214
1215         atexit(socket_cleanup);
1216         initialized = 1;
1217 }
1218
1219 #undef gethostbyname
1220 struct hostent *mingw_gethostbyname(const char *host)
1221 {
1222         ensure_socket_initialization();
1223         return gethostbyname(host);
1224 }
1225
1226 void mingw_freeaddrinfo(struct addrinfo *res)
1227 {
1228         ipv6_freeaddrinfo(res);
1229 }
1230
1231 int mingw_getaddrinfo(const char *node, const char *service,
1232                       const struct addrinfo *hints, struct addrinfo **res)
1233 {
1234         ensure_socket_initialization();
1235         return ipv6_getaddrinfo(node, service, hints, res);
1236 }
1237
1238 int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1239                       char *host, DWORD hostlen, char *serv, DWORD servlen,
1240                       int flags)
1241 {
1242         ensure_socket_initialization();
1243         return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1244 }
1245
1246 int mingw_socket(int domain, int type, int protocol)
1247 {
1248         int sockfd;
1249         SOCKET s;
1250
1251         ensure_socket_initialization();
1252         s = WSASocket(domain, type, protocol, NULL, 0, 0);
1253         if (s == INVALID_SOCKET) {
1254                 /*
1255                  * WSAGetLastError() values are regular BSD error codes
1256                  * biased by WSABASEERR.
1257                  * However, strerror() does not know about networking
1258                  * specific errors, which are values beginning at 38 or so.
1259                  * Therefore, we choose to leave the biased error code
1260                  * in errno so that _if_ someone looks up the code somewhere,
1261                  * then it is at least the number that are usually listed.
1262                  */
1263                 errno = WSAGetLastError();
1264                 return -1;
1265         }
1266         /* convert into a file descriptor */
1267         if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1268                 closesocket(s);
1269                 return error("unable to make a socket file descriptor: %s",
1270                         strerror(errno));
1271         }
1272         return sockfd;
1273 }
1274
1275 #undef connect
1276 int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1277 {
1278         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1279         return connect(s, sa, sz);
1280 }
1281
1282 #undef bind
1283 int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1284 {
1285         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1286         return bind(s, sa, sz);
1287 }
1288
1289 #undef setsockopt
1290 int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1291 {
1292         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1293         return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1294 }
1295
1296 #undef listen
1297 int mingw_listen(int sockfd, int backlog)
1298 {
1299         SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1300         return listen(s, backlog);
1301 }
1302
1303 #undef accept
1304 int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1305 {
1306         int sockfd2;
1307
1308         SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1309         SOCKET s2 = accept(s1, sa, sz);
1310
1311         /* convert into a file descriptor */
1312         if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1313                 int err = errno;
1314                 closesocket(s2);
1315                 return error("unable to make a socket file descriptor: %s",
1316                         strerror(err));
1317         }
1318         return sockfd2;
1319 }
1320
1321 #undef rename
1322 int mingw_rename(const char *pold, const char *pnew)
1323 {
1324         DWORD attrs, gle;
1325         int tries = 0;
1326         static const int delay[] = { 0, 1, 10, 20, 40 };
1327
1328         /*
1329          * Try native rename() first to get errno right.
1330          * It is based on MoveFile(), which cannot overwrite existing files.
1331          */
1332         if (!rename(pold, pnew))
1333                 return 0;
1334         if (errno != EEXIST)
1335                 return -1;
1336 repeat:
1337         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1338                 return 0;
1339         /* TODO: translate more errors */
1340         gle = GetLastError();
1341         if (gle == ERROR_ACCESS_DENIED &&
1342             (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1343                 if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1344                         errno = EISDIR;
1345                         return -1;
1346                 }
1347                 if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1348                     SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1349                         if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1350                                 return 0;
1351                         gle = GetLastError();
1352                         /* revert file attributes on failure */
1353                         SetFileAttributes(pnew, attrs);
1354                 }
1355         }
1356         if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1357                 /*
1358                  * We assume that some other process had the source or
1359                  * destination file open at the wrong moment and retry.
1360                  * In order to give the other process a higher chance to
1361                  * complete its operation, we give up our time slice now.
1362                  * If we have to retry again, we do sleep a bit.
1363                  */
1364                 Sleep(delay[tries]);
1365                 tries++;
1366                 goto repeat;
1367         }
1368         errno = EACCES;
1369         return -1;
1370 }
1371
1372 /*
1373  * Note that this doesn't return the actual pagesize, but
1374  * the allocation granularity. If future Windows specific git code
1375  * needs the real getpagesize function, we need to find another solution.
1376  */
1377 int mingw_getpagesize(void)
1378 {
1379         SYSTEM_INFO si;
1380         GetSystemInfo(&si);
1381         return si.dwAllocationGranularity;
1382 }
1383
1384 struct passwd *getpwuid(int uid)
1385 {
1386         static char user_name[100];
1387         static struct passwd p;
1388
1389         DWORD len = sizeof(user_name);
1390         if (!GetUserName(user_name, &len))
1391                 return NULL;
1392         p.pw_name = user_name;
1393         p.pw_gecos = "unknown";
1394         p.pw_dir = NULL;
1395         return &p;
1396 }
1397
1398 static HANDLE timer_event;
1399 static HANDLE timer_thread;
1400 static int timer_interval;
1401 static int one_shot;
1402 static sig_handler_t timer_fn = SIG_DFL;
1403
1404 /* The timer works like this:
1405  * The thread, ticktack(), is a trivial routine that most of the time
1406  * only waits to receive the signal to terminate. The main thread tells
1407  * the thread to terminate by setting the timer_event to the signalled
1408  * state.
1409  * But ticktack() interrupts the wait state after the timer's interval
1410  * length to call the signal handler.
1411  */
1412
1413 static unsigned __stdcall ticktack(void *dummy)
1414 {
1415         while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1416                 if (timer_fn == SIG_DFL)
1417                         die("Alarm");
1418                 if (timer_fn != SIG_IGN)
1419                         timer_fn(SIGALRM);
1420                 if (one_shot)
1421                         break;
1422         }
1423         return 0;
1424 }
1425
1426 static int start_timer_thread(void)
1427 {
1428         timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1429         if (timer_event) {
1430                 timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1431                 if (!timer_thread )
1432                         return errno = ENOMEM,
1433                                 error("cannot start timer thread");
1434         } else
1435                 return errno = ENOMEM,
1436                         error("cannot allocate resources for timer");
1437         return 0;
1438 }
1439
1440 static void stop_timer_thread(void)
1441 {
1442         if (timer_event)
1443                 SetEvent(timer_event);  /* tell thread to terminate */
1444         if (timer_thread) {
1445                 int rc = WaitForSingleObject(timer_thread, 1000);
1446                 if (rc == WAIT_TIMEOUT)
1447                         error("timer thread did not terminate timely");
1448                 else if (rc != WAIT_OBJECT_0)
1449                         error("waiting for timer thread failed: %lu",
1450                               GetLastError());
1451                 CloseHandle(timer_thread);
1452         }
1453         if (timer_event)
1454                 CloseHandle(timer_event);
1455         timer_event = NULL;
1456         timer_thread = NULL;
1457 }
1458
1459 static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1460 {
1461         return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1462 }
1463
1464 int setitimer(int type, struct itimerval *in, struct itimerval *out)
1465 {
1466         static const struct timeval zero;
1467         static int atexit_done;
1468
1469         if (out != NULL)
1470                 return errno = EINVAL,
1471                         error("setitimer param 3 != NULL not implemented");
1472         if (!is_timeval_eq(&in->it_interval, &zero) &&
1473             !is_timeval_eq(&in->it_interval, &in->it_value))
1474                 return errno = EINVAL,
1475                         error("setitimer: it_interval must be zero or eq it_value");
1476
1477         if (timer_thread)
1478                 stop_timer_thread();
1479
1480         if (is_timeval_eq(&in->it_value, &zero) &&
1481             is_timeval_eq(&in->it_interval, &zero))
1482                 return 0;
1483
1484         timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1485         one_shot = is_timeval_eq(&in->it_interval, &zero);
1486         if (!atexit_done) {
1487                 atexit(stop_timer_thread);
1488                 atexit_done = 1;
1489         }
1490         return start_timer_thread();
1491 }
1492
1493 int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1494 {
1495         if (sig != SIGALRM)
1496                 return errno = EINVAL,
1497                         error("sigaction only implemented for SIGALRM");
1498         if (out != NULL)
1499                 return errno = EINVAL,
1500                         error("sigaction: param 3 != NULL not implemented");
1501
1502         timer_fn = in->sa_handler;
1503         return 0;
1504 }
1505
1506 #undef signal
1507 sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1508 {
1509         sig_handler_t old = timer_fn;
1510         if (sig != SIGALRM)
1511                 return signal(sig, handler);
1512         timer_fn = handler;
1513         return old;
1514 }
1515
1516 static const char *make_backslash_path(const char *path)
1517 {
1518         static char buf[PATH_MAX + 1];
1519         char *c;
1520
1521         if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1522                 die("Too long path: %.*s", 60, path);
1523
1524         for (c = buf; *c; c++) {
1525                 if (*c == '/')
1526                         *c = '\\';
1527         }
1528         return buf;
1529 }
1530
1531 void mingw_open_html(const char *unixpath)
1532 {
1533         const char *htmlpath = make_backslash_path(unixpath);
1534         typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1535                         const char *, const char *, const char *, INT);
1536         T ShellExecute;
1537         HMODULE shell32;
1538         int r;
1539
1540         shell32 = LoadLibrary("shell32.dll");
1541         if (!shell32)
1542                 die("cannot load shell32.dll");
1543         ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1544         if (!ShellExecute)
1545                 die("cannot run browser");
1546
1547         printf("Launching default browser to display HTML ...\n");
1548         r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1549         FreeLibrary(shell32);
1550         /* see the MSDN documentation referring to the result codes here */
1551         if (r <= 32) {
1552                 die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1553         }
1554 }
1555
1556 int link(const char *oldpath, const char *newpath)
1557 {
1558         typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1559         static T create_hard_link = NULL;
1560         if (!create_hard_link) {
1561                 create_hard_link = (T) GetProcAddress(
1562                         GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1563                 if (!create_hard_link)
1564                         create_hard_link = (T)-1;
1565         }
1566         if (create_hard_link == (T)-1) {
1567                 errno = ENOSYS;
1568                 return -1;
1569         }
1570         if (!create_hard_link(newpath, oldpath, NULL)) {
1571                 errno = err_win_to_posix(GetLastError());
1572                 return -1;
1573         }
1574         return 0;
1575 }
1576
1577 char *getpass(const char *prompt)
1578 {
1579         struct strbuf buf = STRBUF_INIT;
1580
1581         fputs(prompt, stderr);
1582         for (;;) {
1583                 char c = _getch();
1584                 if (c == '\r' || c == '\n')
1585                         break;
1586                 strbuf_addch(&buf, c);
1587         }
1588         fputs("\n", stderr);
1589         return strbuf_detach(&buf, NULL);
1590 }
1591
1592 pid_t waitpid(pid_t pid, int *status, unsigned options)
1593 {
1594         HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1595             FALSE, pid);
1596         if (!h) {
1597                 errno = ECHILD;
1598                 return -1;
1599         }
1600
1601         if (pid > 0 && options & WNOHANG) {
1602                 if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1603                         CloseHandle(h);
1604                         return 0;
1605                 }
1606                 options &= ~WNOHANG;
1607         }
1608
1609         if (options == 0) {
1610                 struct pinfo_t **ppinfo;
1611                 if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1612                         CloseHandle(h);
1613                         return 0;
1614                 }
1615
1616                 if (status)
1617                         GetExitCodeProcess(h, (LPDWORD)status);
1618
1619                 EnterCriticalSection(&pinfo_cs);
1620
1621                 ppinfo = &pinfo;
1622                 while (*ppinfo) {
1623                         struct pinfo_t *info = *ppinfo;
1624                         if (info->pid == pid) {
1625                                 CloseHandle(info->proc);
1626                                 *ppinfo = info->next;
1627                                 free(info);
1628                                 break;
1629                         }
1630                         ppinfo = &info->next;
1631                 }
1632
1633                 LeaveCriticalSection(&pinfo_cs);
1634
1635                 CloseHandle(h);
1636                 return pid;
1637         }
1638         CloseHandle(h);
1639
1640         errno = EINVAL;
1641         return -1;
1642 }