Andrew's git / gitweb.git / compat/mingw.c
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compat / mingw.con commit write_entry(): separate two helper functions out (fd5db55)
   1#include "../git-compat-util.h"
   2#include "win32.h"
   3#include <conio.h>
   4#include "../strbuf.h"
   5#include "../run-command.h"
   6
   7static const int delay[] = { 0, 1, 10, 20, 40 };
   8
   9int 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
 122static inline int is_file_in_use_error(DWORD errcode)
 123{
 124        switch (errcode) {
 125        case ERROR_SHARING_VIOLATION:
 126        case ERROR_ACCESS_DENIED:
 127                return 1;
 128        }
 129
 130        return 0;
 131}
 132
 133static int read_yes_no_answer(void)
 134{
 135        char answer[1024];
 136
 137        if (fgets(answer, sizeof(answer), stdin)) {
 138                size_t answer_len = strlen(answer);
 139                int got_full_line = 0, c;
 140
 141                /* remove the newline */
 142                if (answer_len >= 2 && answer[answer_len-2] == '\r') {
 143                        answer[answer_len-2] = '\0';
 144                        got_full_line = 1;
 145                } else if (answer_len >= 1 && answer[answer_len-1] == '\n') {
 146                        answer[answer_len-1] = '\0';
 147                        got_full_line = 1;
 148                }
 149                /* flush the buffer in case we did not get the full line */
 150                if (!got_full_line)
 151                        while ((c = getchar()) != EOF && c != '\n')
 152                                ;
 153        } else
 154                /* we could not read, return the
 155                 * default answer which is no */
 156                return 0;
 157
 158        if (tolower(answer[0]) == 'y' && !answer[1])
 159                return 1;
 160        if (!strncasecmp(answer, "yes", sizeof(answer)))
 161                return 1;
 162        if (tolower(answer[0]) == 'n' && !answer[1])
 163                return 0;
 164        if (!strncasecmp(answer, "no", sizeof(answer)))
 165                return 0;
 166
 167        /* did not find an answer we understand */
 168        return -1;
 169}
 170
 171static int ask_yes_no_if_possible(const char *format, ...)
 172{
 173        char question[4096];
 174        const char *retry_hook[] = { NULL, NULL, NULL };
 175        va_list args;
 176
 177        va_start(args, format);
 178        vsnprintf(question, sizeof(question), format, args);
 179        va_end(args);
 180
 181        if ((retry_hook[0] = getenv("GIT_ASK_YESNO"))) {
 182                retry_hook[1] = question;
 183                return !run_command_v_opt(retry_hook, 0);
 184        }
 185
 186        if (!isatty(_fileno(stdin)) || !isatty(_fileno(stderr)))
 187                return 0;
 188
 189        while (1) {
 190                int answer;
 191                fprintf(stderr, "%s (y/n) ", question);
 192
 193                if ((answer = read_yes_no_answer()) >= 0)
 194                        return answer;
 195
 196                fprintf(stderr, "Sorry, I did not understand your answer. "
 197                                "Please type 'y' or 'n'\n");
 198        }
 199}
 200
 201#undef unlink
 202int mingw_unlink(const char *pathname)
 203{
 204        int ret, tries = 0;
 205
 206        /* read-only files cannot be removed */
 207        chmod(pathname, 0666);
 208        while ((ret = unlink(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 209                if (!is_file_in_use_error(GetLastError()))
 210                        break;
 211                /*
 212                 * We assume that some other process had the source or
 213                 * destination file open at the wrong moment and retry.
 214                 * In order to give the other process a higher chance to
 215                 * complete its operation, we give up our time slice now.
 216                 * If we have to retry again, we do sleep a bit.
 217                 */
 218                Sleep(delay[tries]);
 219                tries++;
 220        }
 221        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 222               ask_yes_no_if_possible("Unlink of file '%s' failed. "
 223                        "Should I try again?", pathname))
 224               ret = unlink(pathname);
 225        return ret;
 226}
 227
 228static int is_dir_empty(const char *path)
 229{
 230        struct strbuf buf = STRBUF_INIT;
 231        WIN32_FIND_DATAA findbuf;
 232        HANDLE handle;
 233
 234        strbuf_addf(&buf, "%s\\*", path);
 235        handle = FindFirstFileA(buf.buf, &findbuf);
 236        if (handle == INVALID_HANDLE_VALUE) {
 237                strbuf_release(&buf);
 238                return GetLastError() == ERROR_NO_MORE_FILES;
 239        }
 240
 241        while (!strcmp(findbuf.cFileName, ".") ||
 242                        !strcmp(findbuf.cFileName, ".."))
 243                if (!FindNextFile(handle, &findbuf)) {
 244                        strbuf_release(&buf);
 245                        return GetLastError() == ERROR_NO_MORE_FILES;
 246                }
 247        FindClose(handle);
 248        strbuf_release(&buf);
 249        return 0;
 250}
 251
 252#undef rmdir
 253int mingw_rmdir(const char *pathname)
 254{
 255        int ret, tries = 0;
 256
 257        while ((ret = rmdir(pathname)) == -1 && tries < ARRAY_SIZE(delay)) {
 258                if (!is_file_in_use_error(GetLastError()))
 259                        break;
 260                if (!is_dir_empty(pathname)) {
 261                        errno = ENOTEMPTY;
 262                        break;
 263                }
 264                /*
 265                 * We assume that some other process had the source or
 266                 * destination file open at the wrong moment and retry.
 267                 * In order to give the other process a higher chance to
 268                 * complete its operation, we give up our time slice now.
 269                 * If we have to retry again, we do sleep a bit.
 270                 */
 271                Sleep(delay[tries]);
 272                tries++;
 273        }
 274        while (ret == -1 && is_file_in_use_error(GetLastError()) &&
 275               ask_yes_no_if_possible("Deletion of directory '%s' failed. "
 276                        "Should I try again?", pathname))
 277               ret = rmdir(pathname);
 278        return ret;
 279}
 280
 281#undef open
 282int mingw_open (const char *filename, int oflags, ...)
 283{
 284        va_list args;
 285        unsigned mode;
 286        int fd;
 287
 288        va_start(args, oflags);
 289        mode = va_arg(args, int);
 290        va_end(args);
 291
 292        if (filename && !strcmp(filename, "/dev/null"))
 293                filename = "nul";
 294
 295        fd = open(filename, oflags, mode);
 296
 297        if (fd < 0 && (oflags & O_CREAT) && errno == EACCES) {
 298                DWORD attrs = GetFileAttributes(filename);
 299                if (attrs != INVALID_FILE_ATTRIBUTES && (attrs & FILE_ATTRIBUTE_DIRECTORY))
 300                        errno = EISDIR;
 301        }
 302        return fd;
 303}
 304
 305#undef write
 306ssize_t mingw_write(int fd, const void *buf, size_t count)
 307{
 308        /*
 309         * While write() calls to a file on a local disk are translated
 310         * into WriteFile() calls with a maximum size of 64KB on Windows
 311         * XP and 256KB on Vista, no such cap is placed on writes to
 312         * files over the network on Windows XP.  Unfortunately, there
 313         * seems to be a limit of 32MB-28KB on X64 and 64MB-32KB on x86;
 314         * bigger writes fail on Windows XP.
 315         * So we cap to a nice 31MB here to avoid write failures over
 316         * the net without changing the number of WriteFile() calls in
 317         * the local case.
 318         */
 319        return write(fd, buf, min(count, 31 * 1024 * 1024));
 320}
 321
 322#undef fopen
 323FILE *mingw_fopen (const char *filename, const char *otype)
 324{
 325        if (filename && !strcmp(filename, "/dev/null"))
 326                filename = "nul";
 327        return fopen(filename, otype);
 328}
 329
 330#undef freopen
 331FILE *mingw_freopen (const char *filename, const char *otype, FILE *stream)
 332{
 333        if (filename && !strcmp(filename, "/dev/null"))
 334                filename = "nul";
 335        return freopen(filename, otype, stream);
 336}
 337
 338/*
 339 * The unit of FILETIME is 100-nanoseconds since January 1, 1601, UTC.
 340 * Returns the 100-nanoseconds ("hekto nanoseconds") since the epoch.
 341 */
 342static inline long long filetime_to_hnsec(const FILETIME *ft)
 343{
 344        long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
 345        /* Windows to Unix Epoch conversion */
 346        return winTime - 116444736000000000LL;
 347}
 348
 349static inline time_t filetime_to_time_t(const FILETIME *ft)
 350{
 351        return (time_t)(filetime_to_hnsec(ft) / 10000000);
 352}
 353
 354/* We keep the do_lstat code in a separate function to avoid recursion.
 355 * When a path ends with a slash, the stat will fail with ENOENT. In
 356 * this case, we strip the trailing slashes and stat again.
 357 *
 358 * If follow is true then act like stat() and report on the link
 359 * target. Otherwise report on the link itself.
 360 */
 361static int do_lstat(int follow, const char *file_name, struct stat *buf)
 362{
 363        int err;
 364        WIN32_FILE_ATTRIBUTE_DATA fdata;
 365
 366        if (!(err = get_file_attr(file_name, &fdata))) {
 367                buf->st_ino = 0;
 368                buf->st_gid = 0;
 369                buf->st_uid = 0;
 370                buf->st_nlink = 1;
 371                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 372                buf->st_size = fdata.nFileSizeLow |
 373                        (((off_t)fdata.nFileSizeHigh)<<32);
 374                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 375                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 376                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 377                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 378                if (fdata.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
 379                        WIN32_FIND_DATAA findbuf;
 380                        HANDLE handle = FindFirstFileA(file_name, &findbuf);
 381                        if (handle != INVALID_HANDLE_VALUE) {
 382                                if ((findbuf.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) &&
 383                                                (findbuf.dwReserved0 == IO_REPARSE_TAG_SYMLINK)) {
 384                                        if (follow) {
 385                                                char buffer[MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
 386                                                buf->st_size = readlink(file_name, buffer, MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
 387                                        } else {
 388                                                buf->st_mode = S_IFLNK;
 389                                        }
 390                                        buf->st_mode |= S_IREAD;
 391                                        if (!(findbuf.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
 392                                                buf->st_mode |= S_IWRITE;
 393                                }
 394                                FindClose(handle);
 395                        }
 396                }
 397                return 0;
 398        }
 399        errno = err;
 400        return -1;
 401}
 402
 403/* We provide our own lstat/fstat functions, since the provided
 404 * lstat/fstat functions are so slow. These stat functions are
 405 * tailored for Git's usage (read: fast), and are not meant to be
 406 * complete. Note that Git stat()s are redirected to mingw_lstat()
 407 * too, since Windows doesn't really handle symlinks that well.
 408 */
 409static int do_stat_internal(int follow, const char *file_name, struct stat *buf)
 410{
 411        int namelen;
 412        static char alt_name[PATH_MAX];
 413
 414        if (!do_lstat(follow, file_name, buf))
 415                return 0;
 416
 417        /* if file_name ended in a '/', Windows returned ENOENT;
 418         * try again without trailing slashes
 419         */
 420        if (errno != ENOENT)
 421                return -1;
 422
 423        namelen = strlen(file_name);
 424        if (namelen && file_name[namelen-1] != '/')
 425                return -1;
 426        while (namelen && file_name[namelen-1] == '/')
 427                --namelen;
 428        if (!namelen || namelen >= PATH_MAX)
 429                return -1;
 430
 431        memcpy(alt_name, file_name, namelen);
 432        alt_name[namelen] = 0;
 433        return do_lstat(follow, alt_name, buf);
 434}
 435
 436int mingw_lstat(const char *file_name, struct stat *buf)
 437{
 438        return do_stat_internal(0, file_name, buf);
 439}
 440int mingw_stat(const char *file_name, struct stat *buf)
 441{
 442        return do_stat_internal(1, file_name, buf);
 443}
 444
 445#undef fstat
 446int mingw_fstat(int fd, struct stat *buf)
 447{
 448        HANDLE fh = (HANDLE)_get_osfhandle(fd);
 449        BY_HANDLE_FILE_INFORMATION fdata;
 450
 451        if (fh == INVALID_HANDLE_VALUE) {
 452                errno = EBADF;
 453                return -1;
 454        }
 455        /* direct non-file handles to MS's fstat() */
 456        if (GetFileType(fh) != FILE_TYPE_DISK)
 457                return _fstati64(fd, buf);
 458
 459        if (GetFileInformationByHandle(fh, &fdata)) {
 460                buf->st_ino = 0;
 461                buf->st_gid = 0;
 462                buf->st_uid = 0;
 463                buf->st_nlink = 1;
 464                buf->st_mode = file_attr_to_st_mode(fdata.dwFileAttributes);
 465                buf->st_size = fdata.nFileSizeLow |
 466                        (((off_t)fdata.nFileSizeHigh)<<32);
 467                buf->st_dev = buf->st_rdev = 0; /* not used by Git */
 468                buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
 469                buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
 470                buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
 471                return 0;
 472        }
 473        errno = EBADF;
 474        return -1;
 475}
 476
 477static inline void time_t_to_filetime(time_t t, FILETIME *ft)
 478{
 479        long long winTime = t * 10000000LL + 116444736000000000LL;
 480        ft->dwLowDateTime = winTime;
 481        ft->dwHighDateTime = winTime >> 32;
 482}
 483
 484int mingw_utime (const char *file_name, const struct utimbuf *times)
 485{
 486        FILETIME mft, aft;
 487        int fh, rc;
 488
 489        /* must have write permission */
 490        DWORD attrs = GetFileAttributes(file_name);
 491        if (attrs != INVALID_FILE_ATTRIBUTES &&
 492            (attrs & FILE_ATTRIBUTE_READONLY)) {
 493                /* ignore errors here; open() will report them */
 494                SetFileAttributes(file_name, attrs & ~FILE_ATTRIBUTE_READONLY);
 495        }
 496
 497        if ((fh = open(file_name, O_RDWR | O_BINARY)) < 0) {
 498                rc = -1;
 499                goto revert_attrs;
 500        }
 501
 502        if (times) {
 503                time_t_to_filetime(times->modtime, &mft);
 504                time_t_to_filetime(times->actime, &aft);
 505        } else {
 506                GetSystemTimeAsFileTime(&mft);
 507                aft = mft;
 508        }
 509        if (!SetFileTime((HANDLE)_get_osfhandle(fh), NULL, &aft, &mft)) {
 510                errno = EINVAL;
 511                rc = -1;
 512        } else
 513                rc = 0;
 514        close(fh);
 515
 516revert_attrs:
 517        if (attrs != INVALID_FILE_ATTRIBUTES &&
 518            (attrs & FILE_ATTRIBUTE_READONLY)) {
 519                /* ignore errors again */
 520                SetFileAttributes(file_name, attrs);
 521        }
 522        return rc;
 523}
 524
 525unsigned int sleep (unsigned int seconds)
 526{
 527        Sleep(seconds*1000);
 528        return 0;
 529}
 530
 531int mkstemp(char *template)
 532{
 533        char *filename = mktemp(template);
 534        if (filename == NULL)
 535                return -1;
 536        return open(filename, O_RDWR | O_CREAT, 0600);
 537}
 538
 539int gettimeofday(struct timeval *tv, void *tz)
 540{
 541        FILETIME ft;
 542        long long hnsec;
 543
 544        GetSystemTimeAsFileTime(&ft);
 545        hnsec = filetime_to_hnsec(&ft);
 546        tv->tv_sec = hnsec / 10000000;
 547        tv->tv_usec = (hnsec % 10000000) / 10;
 548        return 0;
 549}
 550
 551int pipe(int filedes[2])
 552{
 553        HANDLE h[2];
 554
 555        /* this creates non-inheritable handles */
 556        if (!CreatePipe(&h[0], &h[1], NULL, 8192)) {
 557                errno = err_win_to_posix(GetLastError());
 558                return -1;
 559        }
 560        filedes[0] = _open_osfhandle((int)h[0], O_NOINHERIT);
 561        if (filedes[0] < 0) {
 562                CloseHandle(h[0]);
 563                CloseHandle(h[1]);
 564                return -1;
 565        }
 566        filedes[1] = _open_osfhandle((int)h[1], O_NOINHERIT);
 567        if (filedes[0] < 0) {
 568                close(filedes[0]);
 569                CloseHandle(h[1]);
 570                return -1;
 571        }
 572        return 0;
 573}
 574
 575struct tm *gmtime_r(const time_t *timep, struct tm *result)
 576{
 577        /* gmtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 578        memcpy(result, gmtime(timep), sizeof(struct tm));
 579        return result;
 580}
 581
 582struct tm *localtime_r(const time_t *timep, struct tm *result)
 583{
 584        /* localtime() in MSVCRT.DLL is thread-safe, but not reentrant */
 585        memcpy(result, localtime(timep), sizeof(struct tm));
 586        return result;
 587}
 588
 589#undef getcwd
 590char *mingw_getcwd(char *pointer, int len)
 591{
 592        int i;
 593        char *ret = getcwd(pointer, len);
 594        if (!ret)
 595                return ret;
 596        for (i = 0; pointer[i]; i++)
 597                if (pointer[i] == '\\')
 598                        pointer[i] = '/';
 599        return ret;
 600}
 601
 602#undef getenv
 603char *mingw_getenv(const char *name)
 604{
 605        char *result = getenv(name);
 606        if (!result && !strcmp(name, "TMPDIR")) {
 607                /* on Windows it is TMP and TEMP */
 608                result = getenv("TMP");
 609                if (!result)
 610                        result = getenv("TEMP");
 611        }
 612        return result;
 613}
 614
 615/*
 616 * See http://msdn2.microsoft.com/en-us/library/17w5ykft(vs.71).aspx
 617 * (Parsing C++ Command-Line Arguments)
 618 */
 619static const char *quote_arg(const char *arg)
 620{
 621        /* count chars to quote */
 622        int len = 0, n = 0;
 623        int force_quotes = 0;
 624        char *q, *d;
 625        const char *p = arg;
 626        if (!*p) force_quotes = 1;
 627        while (*p) {
 628                if (isspace(*p) || *p == '*' || *p == '?' || *p == '{' || *p == '\'')
 629                        force_quotes = 1;
 630                else if (*p == '"')
 631                        n++;
 632                else if (*p == '\\') {
 633                        int count = 0;
 634                        while (*p == '\\') {
 635                                count++;
 636                                p++;
 637                                len++;
 638                        }
 639                        if (*p == '"')
 640                                n += count*2 + 1;
 641                        continue;
 642                }
 643                len++;
 644                p++;
 645        }
 646        if (!force_quotes && n == 0)
 647                return arg;
 648
 649        /* insert \ where necessary */
 650        d = q = xmalloc(len+n+3);
 651        *d++ = '"';
 652        while (*arg) {
 653                if (*arg == '"')
 654                        *d++ = '\\';
 655                else if (*arg == '\\') {
 656                        int count = 0;
 657                        while (*arg == '\\') {
 658                                count++;
 659                                *d++ = *arg++;
 660                        }
 661                        if (*arg == '"') {
 662                                while (count-- > 0)
 663                                        *d++ = '\\';
 664                                *d++ = '\\';
 665                        }
 666                }
 667                *d++ = *arg++;
 668        }
 669        *d++ = '"';
 670        *d++ = 0;
 671        return q;
 672}
 673
 674static const char *parse_interpreter(const char *cmd)
 675{
 676        static char buf[100];
 677        char *p, *opt;
 678        int n, fd;
 679
 680        /* don't even try a .exe */
 681        n = strlen(cmd);
 682        if (n >= 4 && !strcasecmp(cmd+n-4, ".exe"))
 683                return NULL;
 684
 685        fd = open(cmd, O_RDONLY);
 686        if (fd < 0)
 687                return NULL;
 688        n = read(fd, buf, sizeof(buf)-1);
 689        close(fd);
 690        if (n < 4)      /* at least '#!/x' and not error */
 691                return NULL;
 692
 693        if (buf[0] != '#' || buf[1] != '!')
 694                return NULL;
 695        buf[n] = '\0';
 696        p = buf + strcspn(buf, "\r\n");
 697        if (!*p)
 698                return NULL;
 699
 700        *p = '\0';
 701        if (!(p = strrchr(buf+2, '/')) && !(p = strrchr(buf+2, '\\')))
 702                return NULL;
 703        /* strip options */
 704        if ((opt = strchr(p+1, ' ')))
 705                *opt = '\0';
 706        return p+1;
 707}
 708
 709/*
 710 * Splits the PATH into parts.
 711 */
 712static char **get_path_split(void)
 713{
 714        char *p, **path, *envpath = getenv("PATH");
 715        int i, n = 0;
 716
 717        if (!envpath || !*envpath)
 718                return NULL;
 719
 720        envpath = xstrdup(envpath);
 721        p = envpath;
 722        while (p) {
 723                char *dir = p;
 724                p = strchr(p, ';');
 725                if (p) *p++ = '\0';
 726                if (*dir) {     /* not earlier, catches series of ; */
 727                        ++n;
 728                }
 729        }
 730        if (!n)
 731                return NULL;
 732
 733        path = xmalloc((n+1)*sizeof(char *));
 734        p = envpath;
 735        i = 0;
 736        do {
 737                if (*p)
 738                        path[i++] = xstrdup(p);
 739                p = p+strlen(p)+1;
 740        } while (i < n);
 741        path[i] = NULL;
 742
 743        free(envpath);
 744
 745        return path;
 746}
 747
 748static void free_path_split(char **path)
 749{
 750        char **p = path;
 751
 752        if (!path)
 753                return;
 754
 755        while (*p)
 756                free(*p++);
 757        free(path);
 758}
 759
 760/*
 761 * exe_only means that we only want to detect .exe files, but not scripts
 762 * (which do not have an extension)
 763 */
 764static char *lookup_prog(const char *dir, const char *cmd, int isexe, int exe_only)
 765{
 766        char path[MAX_PATH];
 767        snprintf(path, sizeof(path), "%s/%s.exe", dir, cmd);
 768
 769        if (!isexe && access(path, F_OK) == 0)
 770                return xstrdup(path);
 771        path[strlen(path)-4] = '\0';
 772        if ((!exe_only || isexe) && access(path, F_OK) == 0)
 773                if (!(GetFileAttributes(path) & FILE_ATTRIBUTE_DIRECTORY))
 774                        return xstrdup(path);
 775        return NULL;
 776}
 777
 778/*
 779 * Determines the absolute path of cmd using the split path in path.
 780 * If cmd contains a slash or backslash, no lookup is performed.
 781 */
 782static char *path_lookup(const char *cmd, char **path, int exe_only)
 783{
 784        char *prog = NULL;
 785        int len = strlen(cmd);
 786        int isexe = len >= 4 && !strcasecmp(cmd+len-4, ".exe");
 787
 788        if (strchr(cmd, '/') || strchr(cmd, '\\'))
 789                prog = xstrdup(cmd);
 790
 791        while (!prog && *path)
 792                prog = lookup_prog(*path++, cmd, isexe, exe_only);
 793
 794        return prog;
 795}
 796
 797static int env_compare(const void *a, const void *b)
 798{
 799        char *const *ea = a;
 800        char *const *eb = b;
 801        return strcasecmp(*ea, *eb);
 802}
 803
 804struct pinfo_t {
 805        struct pinfo_t *next;
 806        pid_t pid;
 807        HANDLE proc;
 808} pinfo_t;
 809struct pinfo_t *pinfo = NULL;
 810CRITICAL_SECTION pinfo_cs;
 811
 812static pid_t mingw_spawnve_fd(const char *cmd, const char **argv, char **env,
 813                              const char *dir,
 814                              int prepend_cmd, int fhin, int fhout, int fherr)
 815{
 816        STARTUPINFO si;
 817        PROCESS_INFORMATION pi;
 818        struct strbuf envblk, args;
 819        unsigned flags;
 820        BOOL ret;
 821
 822        /* Determine whether or not we are associated to a console */
 823        HANDLE cons = CreateFile("CONOUT$", GENERIC_WRITE,
 824                        FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
 825                        FILE_ATTRIBUTE_NORMAL, NULL);
 826        if (cons == INVALID_HANDLE_VALUE) {
 827                /* There is no console associated with this process.
 828                 * Since the child is a console process, Windows
 829                 * would normally create a console window. But
 830                 * since we'll be redirecting std streams, we do
 831                 * not need the console.
 832                 * It is necessary to use DETACHED_PROCESS
 833                 * instead of CREATE_NO_WINDOW to make ssh
 834                 * recognize that it has no console.
 835                 */
 836                flags = DETACHED_PROCESS;
 837        } else {
 838                /* There is already a console. If we specified
 839                 * DETACHED_PROCESS here, too, Windows would
 840                 * disassociate the child from the console.
 841                 * The same is true for CREATE_NO_WINDOW.
 842                 * Go figure!
 843                 */
 844                flags = 0;
 845                CloseHandle(cons);
 846        }
 847        memset(&si, 0, sizeof(si));
 848        si.cb = sizeof(si);
 849        si.dwFlags = STARTF_USESTDHANDLES;
 850        si.hStdInput = (HANDLE) _get_osfhandle(fhin);
 851        si.hStdOutput = (HANDLE) _get_osfhandle(fhout);
 852        si.hStdError = (HANDLE) _get_osfhandle(fherr);
 853
 854        /* concatenate argv, quoting args as we go */
 855        strbuf_init(&args, 0);
 856        if (prepend_cmd) {
 857                char *quoted = (char *)quote_arg(cmd);
 858                strbuf_addstr(&args, quoted);
 859                if (quoted != cmd)
 860                        free(quoted);
 861        }
 862        for (; *argv; argv++) {
 863                char *quoted = (char *)quote_arg(*argv);
 864                if (*args.buf)
 865                        strbuf_addch(&args, ' ');
 866                strbuf_addstr(&args, quoted);
 867                if (quoted != *argv)
 868                        free(quoted);
 869        }
 870
 871        if (env) {
 872                int count = 0;
 873                char **e, **sorted_env;
 874
 875                for (e = env; *e; e++)
 876                        count++;
 877
 878                /* environment must be sorted */
 879                sorted_env = xmalloc(sizeof(*sorted_env) * (count + 1));
 880                memcpy(sorted_env, env, sizeof(*sorted_env) * (count + 1));
 881                qsort(sorted_env, count, sizeof(*sorted_env), env_compare);
 882
 883                strbuf_init(&envblk, 0);
 884                for (e = sorted_env; *e; e++) {
 885                        strbuf_addstr(&envblk, *e);
 886                        strbuf_addch(&envblk, '\0');
 887                }
 888                free(sorted_env);
 889        }
 890
 891        memset(&pi, 0, sizeof(pi));
 892        ret = CreateProcess(cmd, args.buf, NULL, NULL, TRUE, flags,
 893                env ? envblk.buf : NULL, dir, &si, &pi);
 894
 895        if (env)
 896                strbuf_release(&envblk);
 897        strbuf_release(&args);
 898
 899        if (!ret) {
 900                errno = ENOENT;
 901                return -1;
 902        }
 903        CloseHandle(pi.hThread);
 904
 905        /*
 906         * The process ID is the human-readable identifier of the process
 907         * that we want to present in log and error messages. The handle
 908         * is not useful for this purpose. But we cannot close it, either,
 909         * because it is not possible to turn a process ID into a process
 910         * handle after the process terminated.
 911         * Keep the handle in a list for waitpid.
 912         */
 913        EnterCriticalSection(&pinfo_cs);
 914        {
 915                struct pinfo_t *info = xmalloc(sizeof(struct pinfo_t));
 916                info->pid = pi.dwProcessId;
 917                info->proc = pi.hProcess;
 918                info->next = pinfo;
 919                pinfo = info;
 920        }
 921        LeaveCriticalSection(&pinfo_cs);
 922
 923        return (pid_t)pi.dwProcessId;
 924}
 925
 926static pid_t mingw_spawnve(const char *cmd, const char **argv, char **env,
 927                           int prepend_cmd)
 928{
 929        return mingw_spawnve_fd(cmd, argv, env, NULL, prepend_cmd, 0, 1, 2);
 930}
 931
 932pid_t mingw_spawnvpe(const char *cmd, const char **argv, char **env,
 933                     const char *dir,
 934                     int fhin, int fhout, int fherr)
 935{
 936        pid_t pid;
 937        char **path = get_path_split();
 938        char *prog = path_lookup(cmd, path, 0);
 939
 940        if (!prog) {
 941                errno = ENOENT;
 942                pid = -1;
 943        }
 944        else {
 945                const char *interpr = parse_interpreter(prog);
 946
 947                if (interpr) {
 948                        const char *argv0 = argv[0];
 949                        char *iprog = path_lookup(interpr, path, 1);
 950                        argv[0] = prog;
 951                        if (!iprog) {
 952                                errno = ENOENT;
 953                                pid = -1;
 954                        }
 955                        else {
 956                                pid = mingw_spawnve_fd(iprog, argv, env, dir, 1,
 957                                                       fhin, fhout, fherr);
 958                                free(iprog);
 959                        }
 960                        argv[0] = argv0;
 961                }
 962                else
 963                        pid = mingw_spawnve_fd(prog, argv, env, dir, 0,
 964                                               fhin, fhout, fherr);
 965                free(prog);
 966        }
 967        free_path_split(path);
 968        return pid;
 969}
 970
 971static int try_shell_exec(const char *cmd, char *const *argv, char **env)
 972{
 973        const char *interpr = parse_interpreter(cmd);
 974        char **path;
 975        char *prog;
 976        int pid = 0;
 977
 978        if (!interpr)
 979                return 0;
 980        path = get_path_split();
 981        prog = path_lookup(interpr, path, 1);
 982        if (prog) {
 983                int argc = 0;
 984                const char **argv2;
 985                while (argv[argc]) argc++;
 986                argv2 = xmalloc(sizeof(*argv) * (argc+1));
 987                argv2[0] = (char *)cmd; /* full path to the script file */
 988                memcpy(&argv2[1], &argv[1], sizeof(*argv) * argc);
 989                pid = mingw_spawnve(prog, argv2, env, 1);
 990                if (pid >= 0) {
 991                        int status;
 992                        if (waitpid(pid, &status, 0) < 0)
 993                                status = 255;
 994                        exit(status);
 995                }
 996                pid = 1;        /* indicate that we tried but failed */
 997                free(prog);
 998                free(argv2);
 999        }
1000        free_path_split(path);
1001        return pid;
1002}
1003
1004static void mingw_execve(const char *cmd, char *const *argv, char *const *env)
1005{
1006        /* check if git_command is a shell script */
1007        if (!try_shell_exec(cmd, argv, (char **)env)) {
1008                int pid, status;
1009
1010                pid = mingw_spawnve(cmd, (const char **)argv, (char **)env, 0);
1011                if (pid < 0)
1012                        return;
1013                if (waitpid(pid, &status, 0) < 0)
1014                        status = 255;
1015                exit(status);
1016        }
1017}
1018
1019void mingw_execvp(const char *cmd, char *const *argv)
1020{
1021        char **path = get_path_split();
1022        char *prog = path_lookup(cmd, path, 0);
1023
1024        if (prog) {
1025                mingw_execve(prog, argv, environ);
1026                free(prog);
1027        } else
1028                errno = ENOENT;
1029
1030        free_path_split(path);
1031}
1032
1033void mingw_execv(const char *cmd, char *const *argv)
1034{
1035        mingw_execve(cmd, argv, environ);
1036}
1037
1038int mingw_kill(pid_t pid, int sig)
1039{
1040        if (pid > 0 && sig == SIGTERM) {
1041                HANDLE h = OpenProcess(PROCESS_TERMINATE, FALSE, pid);
1042
1043                if (TerminateProcess(h, -1)) {
1044                        CloseHandle(h);
1045                        return 0;
1046                }
1047
1048                errno = err_win_to_posix(GetLastError());
1049                CloseHandle(h);
1050                return -1;
1051        }
1052
1053        errno = EINVAL;
1054        return -1;
1055}
1056
1057static char **copy_environ(void)
1058{
1059        char **env;
1060        int i = 0;
1061        while (environ[i])
1062                i++;
1063        env = xmalloc((i+1)*sizeof(*env));
1064        for (i = 0; environ[i]; i++)
1065                env[i] = xstrdup(environ[i]);
1066        env[i] = NULL;
1067        return env;
1068}
1069
1070void free_environ(char **env)
1071{
1072        int i;
1073        for (i = 0; env[i]; i++)
1074                free(env[i]);
1075        free(env);
1076}
1077
1078static int lookup_env(char **env, const char *name, size_t nmln)
1079{
1080        int i;
1081
1082        for (i = 0; env[i]; i++) {
1083                if (0 == strncmp(env[i], name, nmln)
1084                    && '=' == env[i][nmln])
1085                        /* matches */
1086                        return i;
1087        }
1088        return -1;
1089}
1090
1091/*
1092 * If name contains '=', then sets the variable, otherwise it unsets it
1093 */
1094static char **env_setenv(char **env, const char *name)
1095{
1096        char *eq = strchrnul(name, '=');
1097        int i = lookup_env(env, name, eq-name);
1098
1099        if (i < 0) {
1100                if (*eq) {
1101                        for (i = 0; env[i]; i++)
1102                                ;
1103                        env = xrealloc(env, (i+2)*sizeof(*env));
1104                        env[i] = xstrdup(name);
1105                        env[i+1] = NULL;
1106                }
1107        }
1108        else {
1109                free(env[i]);
1110                if (*eq)
1111                        env[i] = xstrdup(name);
1112                else
1113                        for (; env[i]; i++)
1114                                env[i] = env[i+1];
1115        }
1116        return env;
1117}
1118
1119/*
1120 * Copies global environ and adjusts variables as specified by vars.
1121 */
1122char **make_augmented_environ(const char *const *vars)
1123{
1124        char **env = copy_environ();
1125
1126        while (*vars)
1127                env = env_setenv(env, *vars++);
1128        return env;
1129}
1130
1131/*
1132 * Note, this isn't a complete replacement for getaddrinfo. It assumes
1133 * that service contains a numerical port, or that it is null. It
1134 * does a simple search using gethostbyname, and returns one IPv4 host
1135 * if one was found.
1136 */
1137static int WSAAPI getaddrinfo_stub(const char *node, const char *service,
1138                                   const struct addrinfo *hints,
1139                                   struct addrinfo **res)
1140{
1141        struct hostent *h = NULL;
1142        struct addrinfo *ai;
1143        struct sockaddr_in *sin;
1144
1145        if (node) {
1146                h = gethostbyname(node);
1147                if (!h)
1148                        return WSAGetLastError();
1149        }
1150
1151        ai = xmalloc(sizeof(struct addrinfo));
1152        *res = ai;
1153        ai->ai_flags = 0;
1154        ai->ai_family = AF_INET;
1155        ai->ai_socktype = hints ? hints->ai_socktype : 0;
1156        switch (ai->ai_socktype) {
1157        case SOCK_STREAM:
1158                ai->ai_protocol = IPPROTO_TCP;
1159                break;
1160        case SOCK_DGRAM:
1161                ai->ai_protocol = IPPROTO_UDP;
1162                break;
1163        default:
1164                ai->ai_protocol = 0;
1165                break;
1166        }
1167        ai->ai_addrlen = sizeof(struct sockaddr_in);
1168        if (hints && (hints->ai_flags & AI_CANONNAME))
1169                ai->ai_canonname = h ? strdup(h->h_name) : NULL;
1170        else
1171                ai->ai_canonname = NULL;
1172
1173        sin = xmalloc(ai->ai_addrlen);
1174        memset(sin, 0, ai->ai_addrlen);
1175        sin->sin_family = AF_INET;
1176        /* Note: getaddrinfo is supposed to allow service to be a string,
1177         * which should be looked up using getservbyname. This is
1178         * currently not implemented */
1179        if (service)
1180                sin->sin_port = htons(atoi(service));
1181        if (h)
1182                sin->sin_addr = *(struct in_addr *)h->h_addr;
1183        else if (hints && (hints->ai_flags & AI_PASSIVE))
1184                sin->sin_addr.s_addr = INADDR_ANY;
1185        else
1186                sin->sin_addr.s_addr = INADDR_LOOPBACK;
1187        ai->ai_addr = (struct sockaddr *)sin;
1188        ai->ai_next = 0;
1189        return 0;
1190}
1191
1192static void WSAAPI freeaddrinfo_stub(struct addrinfo *res)
1193{
1194        free(res->ai_canonname);
1195        free(res->ai_addr);
1196        free(res);
1197}
1198
1199static int WSAAPI getnameinfo_stub(const struct sockaddr *sa, socklen_t salen,
1200                                   char *host, DWORD hostlen,
1201                                   char *serv, DWORD servlen, int flags)
1202{
1203        const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
1204        if (sa->sa_family != AF_INET)
1205                return EAI_FAMILY;
1206        if (!host && !serv)
1207                return EAI_NONAME;
1208
1209        if (host && hostlen > 0) {
1210                struct hostent *ent = NULL;
1211                if (!(flags & NI_NUMERICHOST))
1212                        ent = gethostbyaddr((const char *)&sin->sin_addr,
1213                                            sizeof(sin->sin_addr), AF_INET);
1214
1215                if (ent)
1216                        snprintf(host, hostlen, "%s", ent->h_name);
1217                else if (flags & NI_NAMEREQD)
1218                        return EAI_NONAME;
1219                else
1220                        snprintf(host, hostlen, "%s", inet_ntoa(sin->sin_addr));
1221        }
1222
1223        if (serv && servlen > 0) {
1224                struct servent *ent = NULL;
1225                if (!(flags & NI_NUMERICSERV))
1226                        ent = getservbyport(sin->sin_port,
1227                                            flags & NI_DGRAM ? "udp" : "tcp");
1228
1229                if (ent)
1230                        snprintf(serv, servlen, "%s", ent->s_name);
1231                else
1232                        snprintf(serv, servlen, "%d", ntohs(sin->sin_port));
1233        }
1234
1235        return 0;
1236}
1237
1238static HMODULE ipv6_dll = NULL;
1239static void (WSAAPI *ipv6_freeaddrinfo)(struct addrinfo *res);
1240static int (WSAAPI *ipv6_getaddrinfo)(const char *node, const char *service,
1241                                      const struct addrinfo *hints,
1242                                      struct addrinfo **res);
1243static int (WSAAPI *ipv6_getnameinfo)(const struct sockaddr *sa, socklen_t salen,
1244                                      char *host, DWORD hostlen,
1245                                      char *serv, DWORD servlen, int flags);
1246/*
1247 * gai_strerror is an inline function in the ws2tcpip.h header, so we
1248 * don't need to try to load that one dynamically.
1249 */
1250
1251static void socket_cleanup(void)
1252{
1253        WSACleanup();
1254        if (ipv6_dll)
1255                FreeLibrary(ipv6_dll);
1256        ipv6_dll = NULL;
1257        ipv6_freeaddrinfo = freeaddrinfo_stub;
1258        ipv6_getaddrinfo = getaddrinfo_stub;
1259        ipv6_getnameinfo = getnameinfo_stub;
1260}
1261
1262static void ensure_socket_initialization(void)
1263{
1264        WSADATA wsa;
1265        static int initialized = 0;
1266        const char *libraries[] = { "ws2_32.dll", "wship6.dll", NULL };
1267        const char **name;
1268
1269        if (initialized)
1270                return;
1271
1272        if (WSAStartup(MAKEWORD(2,2), &wsa))
1273                die("unable to initialize winsock subsystem, error %d",
1274                        WSAGetLastError());
1275
1276        for (name = libraries; *name; name++) {
1277                ipv6_dll = LoadLibrary(*name);
1278                if (!ipv6_dll)
1279                        continue;
1280
1281                ipv6_freeaddrinfo = (void (WSAAPI *)(struct addrinfo *))
1282                        GetProcAddress(ipv6_dll, "freeaddrinfo");
1283                ipv6_getaddrinfo = (int (WSAAPI *)(const char *, const char *,
1284                                                   const struct addrinfo *,
1285                                                   struct addrinfo **))
1286                        GetProcAddress(ipv6_dll, "getaddrinfo");
1287                ipv6_getnameinfo = (int (WSAAPI *)(const struct sockaddr *,
1288                                                   socklen_t, char *, DWORD,
1289                                                   char *, DWORD, int))
1290                        GetProcAddress(ipv6_dll, "getnameinfo");
1291                if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1292                        FreeLibrary(ipv6_dll);
1293                        ipv6_dll = NULL;
1294                } else
1295                        break;
1296        }
1297        if (!ipv6_freeaddrinfo || !ipv6_getaddrinfo || !ipv6_getnameinfo) {
1298                ipv6_freeaddrinfo = freeaddrinfo_stub;
1299                ipv6_getaddrinfo = getaddrinfo_stub;
1300                ipv6_getnameinfo = getnameinfo_stub;
1301        }
1302
1303        atexit(socket_cleanup);
1304        initialized = 1;
1305}
1306
1307#undef gethostbyname
1308struct hostent *mingw_gethostbyname(const char *host)
1309{
1310        ensure_socket_initialization();
1311        return gethostbyname(host);
1312}
1313
1314void mingw_freeaddrinfo(struct addrinfo *res)
1315{
1316        ipv6_freeaddrinfo(res);
1317}
1318
1319int mingw_getaddrinfo(const char *node, const char *service,
1320                      const struct addrinfo *hints, struct addrinfo **res)
1321{
1322        ensure_socket_initialization();
1323        return ipv6_getaddrinfo(node, service, hints, res);
1324}
1325
1326int mingw_getnameinfo(const struct sockaddr *sa, socklen_t salen,
1327                      char *host, DWORD hostlen, char *serv, DWORD servlen,
1328                      int flags)
1329{
1330        ensure_socket_initialization();
1331        return ipv6_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
1332}
1333
1334int mingw_socket(int domain, int type, int protocol)
1335{
1336        int sockfd;
1337        SOCKET s;
1338
1339        ensure_socket_initialization();
1340        s = WSASocket(domain, type, protocol, NULL, 0, 0);
1341        if (s == INVALID_SOCKET) {
1342                /*
1343                 * WSAGetLastError() values are regular BSD error codes
1344                 * biased by WSABASEERR.
1345                 * However, strerror() does not know about networking
1346                 * specific errors, which are values beginning at 38 or so.
1347                 * Therefore, we choose to leave the biased error code
1348                 * in errno so that _if_ someone looks up the code somewhere,
1349                 * then it is at least the number that are usually listed.
1350                 */
1351                errno = WSAGetLastError();
1352                return -1;
1353        }
1354        /* convert into a file descriptor */
1355        if ((sockfd = _open_osfhandle(s, O_RDWR|O_BINARY)) < 0) {
1356                closesocket(s);
1357                return error("unable to make a socket file descriptor: %s",
1358                        strerror(errno));
1359        }
1360        return sockfd;
1361}
1362
1363#undef connect
1364int mingw_connect(int sockfd, struct sockaddr *sa, size_t sz)
1365{
1366        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1367        return connect(s, sa, sz);
1368}
1369
1370#undef bind
1371int mingw_bind(int sockfd, struct sockaddr *sa, size_t sz)
1372{
1373        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1374        return bind(s, sa, sz);
1375}
1376
1377#undef setsockopt
1378int mingw_setsockopt(int sockfd, int lvl, int optname, void *optval, int optlen)
1379{
1380        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1381        return setsockopt(s, lvl, optname, (const char*)optval, optlen);
1382}
1383
1384#undef listen
1385int mingw_listen(int sockfd, int backlog)
1386{
1387        SOCKET s = (SOCKET)_get_osfhandle(sockfd);
1388        return listen(s, backlog);
1389}
1390
1391#undef accept
1392int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz)
1393{
1394        int sockfd2;
1395
1396        SOCKET s1 = (SOCKET)_get_osfhandle(sockfd1);
1397        SOCKET s2 = accept(s1, sa, sz);
1398
1399        /* convert into a file descriptor */
1400        if ((sockfd2 = _open_osfhandle(s2, O_RDWR|O_BINARY)) < 0) {
1401                int err = errno;
1402                closesocket(s2);
1403                return error("unable to make a socket file descriptor: %s",
1404                        strerror(err));
1405        }
1406        return sockfd2;
1407}
1408
1409#undef rename
1410int mingw_rename(const char *pold, const char *pnew)
1411{
1412        DWORD attrs, gle;
1413        int tries = 0;
1414
1415        /*
1416         * Try native rename() first to get errno right.
1417         * It is based on MoveFile(), which cannot overwrite existing files.
1418         */
1419        if (!rename(pold, pnew))
1420                return 0;
1421        if (errno != EEXIST)
1422                return -1;
1423repeat:
1424        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1425                return 0;
1426        /* TODO: translate more errors */
1427        gle = GetLastError();
1428        if (gle == ERROR_ACCESS_DENIED &&
1429            (attrs = GetFileAttributes(pnew)) != INVALID_FILE_ATTRIBUTES) {
1430                if (attrs & FILE_ATTRIBUTE_DIRECTORY) {
1431                        errno = EISDIR;
1432                        return -1;
1433                }
1434                if ((attrs & FILE_ATTRIBUTE_READONLY) &&
1435                    SetFileAttributes(pnew, attrs & ~FILE_ATTRIBUTE_READONLY)) {
1436                        if (MoveFileEx(pold, pnew, MOVEFILE_REPLACE_EXISTING))
1437                                return 0;
1438                        gle = GetLastError();
1439                        /* revert file attributes on failure */
1440                        SetFileAttributes(pnew, attrs);
1441                }
1442        }
1443        if (tries < ARRAY_SIZE(delay) && gle == ERROR_ACCESS_DENIED) {
1444                /*
1445                 * We assume that some other process had the source or
1446                 * destination file open at the wrong moment and retry.
1447                 * In order to give the other process a higher chance to
1448                 * complete its operation, we give up our time slice now.
1449                 * If we have to retry again, we do sleep a bit.
1450                 */
1451                Sleep(delay[tries]);
1452                tries++;
1453                goto repeat;
1454        }
1455        if (gle == ERROR_ACCESS_DENIED &&
1456               ask_yes_no_if_possible("Rename from '%s' to '%s' failed. "
1457                       "Should I try again?", pold, pnew))
1458                goto repeat;
1459
1460        errno = EACCES;
1461        return -1;
1462}
1463
1464/*
1465 * Note that this doesn't return the actual pagesize, but
1466 * the allocation granularity. If future Windows specific git code
1467 * needs the real getpagesize function, we need to find another solution.
1468 */
1469int mingw_getpagesize(void)
1470{
1471        SYSTEM_INFO si;
1472        GetSystemInfo(&si);
1473        return si.dwAllocationGranularity;
1474}
1475
1476struct passwd *getpwuid(int uid)
1477{
1478        static char user_name[100];
1479        static struct passwd p;
1480
1481        DWORD len = sizeof(user_name);
1482        if (!GetUserName(user_name, &len))
1483                return NULL;
1484        p.pw_name = user_name;
1485        p.pw_gecos = "unknown";
1486        p.pw_dir = NULL;
1487        return &p;
1488}
1489
1490static HANDLE timer_event;
1491static HANDLE timer_thread;
1492static int timer_interval;
1493static int one_shot;
1494static sig_handler_t timer_fn = SIG_DFL;
1495
1496/* The timer works like this:
1497 * The thread, ticktack(), is a trivial routine that most of the time
1498 * only waits to receive the signal to terminate. The main thread tells
1499 * the thread to terminate by setting the timer_event to the signalled
1500 * state.
1501 * But ticktack() interrupts the wait state after the timer's interval
1502 * length to call the signal handler.
1503 */
1504
1505static unsigned __stdcall ticktack(void *dummy)
1506{
1507        while (WaitForSingleObject(timer_event, timer_interval) == WAIT_TIMEOUT) {
1508                if (timer_fn == SIG_DFL)
1509                        die("Alarm");
1510                if (timer_fn != SIG_IGN)
1511                        timer_fn(SIGALRM);
1512                if (one_shot)
1513                        break;
1514        }
1515        return 0;
1516}
1517
1518static int start_timer_thread(void)
1519{
1520        timer_event = CreateEvent(NULL, FALSE, FALSE, NULL);
1521        if (timer_event) {
1522                timer_thread = (HANDLE) _beginthreadex(NULL, 0, ticktack, NULL, 0, NULL);
1523                if (!timer_thread )
1524                        return errno = ENOMEM,
1525                                error("cannot start timer thread");
1526        } else
1527                return errno = ENOMEM,
1528                        error("cannot allocate resources for timer");
1529        return 0;
1530}
1531
1532static void stop_timer_thread(void)
1533{
1534        if (timer_event)
1535                SetEvent(timer_event);  /* tell thread to terminate */
1536        if (timer_thread) {
1537                int rc = WaitForSingleObject(timer_thread, 1000);
1538                if (rc == WAIT_TIMEOUT)
1539                        error("timer thread did not terminate timely");
1540                else if (rc != WAIT_OBJECT_0)
1541                        error("waiting for timer thread failed: %lu",
1542                              GetLastError());
1543                CloseHandle(timer_thread);
1544        }
1545        if (timer_event)
1546                CloseHandle(timer_event);
1547        timer_event = NULL;
1548        timer_thread = NULL;
1549}
1550
1551static inline int is_timeval_eq(const struct timeval *i1, const struct timeval *i2)
1552{
1553        return i1->tv_sec == i2->tv_sec && i1->tv_usec == i2->tv_usec;
1554}
1555
1556int setitimer(int type, struct itimerval *in, struct itimerval *out)
1557{
1558        static const struct timeval zero;
1559        static int atexit_done;
1560
1561        if (out != NULL)
1562                return errno = EINVAL,
1563                        error("setitimer param 3 != NULL not implemented");
1564        if (!is_timeval_eq(&in->it_interval, &zero) &&
1565            !is_timeval_eq(&in->it_interval, &in->it_value))
1566                return errno = EINVAL,
1567                        error("setitimer: it_interval must be zero or eq it_value");
1568
1569        if (timer_thread)
1570                stop_timer_thread();
1571
1572        if (is_timeval_eq(&in->it_value, &zero) &&
1573            is_timeval_eq(&in->it_interval, &zero))
1574                return 0;
1575
1576        timer_interval = in->it_value.tv_sec * 1000 + in->it_value.tv_usec / 1000;
1577        one_shot = is_timeval_eq(&in->it_interval, &zero);
1578        if (!atexit_done) {
1579                atexit(stop_timer_thread);
1580                atexit_done = 1;
1581        }
1582        return start_timer_thread();
1583}
1584
1585int sigaction(int sig, struct sigaction *in, struct sigaction *out)
1586{
1587        if (sig != SIGALRM)
1588                return errno = EINVAL,
1589                        error("sigaction only implemented for SIGALRM");
1590        if (out != NULL)
1591                return errno = EINVAL,
1592                        error("sigaction: param 3 != NULL not implemented");
1593
1594        timer_fn = in->sa_handler;
1595        return 0;
1596}
1597
1598#undef signal
1599sig_handler_t mingw_signal(int sig, sig_handler_t handler)
1600{
1601        sig_handler_t old = timer_fn;
1602        if (sig != SIGALRM)
1603                return signal(sig, handler);
1604        timer_fn = handler;
1605        return old;
1606}
1607
1608static const char *make_backslash_path(const char *path)
1609{
1610        static char buf[PATH_MAX + 1];
1611        char *c;
1612
1613        if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
1614                die("Too long path: %.*s", 60, path);
1615
1616        for (c = buf; *c; c++) {
1617                if (*c == '/')
1618                        *c = '\\';
1619        }
1620        return buf;
1621}
1622
1623void mingw_open_html(const char *unixpath)
1624{
1625        const char *htmlpath = make_backslash_path(unixpath);
1626        typedef HINSTANCE (WINAPI *T)(HWND, const char *,
1627                        const char *, const char *, const char *, INT);
1628        T ShellExecute;
1629        HMODULE shell32;
1630        int r;
1631
1632        shell32 = LoadLibrary("shell32.dll");
1633        if (!shell32)
1634                die("cannot load shell32.dll");
1635        ShellExecute = (T)GetProcAddress(shell32, "ShellExecuteA");
1636        if (!ShellExecute)
1637                die("cannot run browser");
1638
1639        printf("Launching default browser to display HTML ...\n");
1640        r = (int)ShellExecute(NULL, "open", htmlpath, NULL, "\\", SW_SHOWNORMAL);
1641        FreeLibrary(shell32);
1642        /* see the MSDN documentation referring to the result codes here */
1643        if (r <= 32) {
1644                die("failed to launch browser for %.*s", MAX_PATH, unixpath);
1645        }
1646}
1647
1648int link(const char *oldpath, const char *newpath)
1649{
1650        typedef BOOL (WINAPI *T)(const char*, const char*, LPSECURITY_ATTRIBUTES);
1651        static T create_hard_link = NULL;
1652        if (!create_hard_link) {
1653                create_hard_link = (T) GetProcAddress(
1654                        GetModuleHandle("kernel32.dll"), "CreateHardLinkA");
1655                if (!create_hard_link)
1656                        create_hard_link = (T)-1;
1657        }
1658        if (create_hard_link == (T)-1) {
1659                errno = ENOSYS;
1660                return -1;
1661        }
1662        if (!create_hard_link(newpath, oldpath, NULL)) {
1663                errno = err_win_to_posix(GetLastError());
1664                return -1;
1665        }
1666        return 0;
1667}
1668
1669char *getpass(const char *prompt)
1670{
1671        struct strbuf buf = STRBUF_INIT;
1672
1673        fputs(prompt, stderr);
1674        for (;;) {
1675                char c = _getch();
1676                if (c == '\r' || c == '\n')
1677                        break;
1678                strbuf_addch(&buf, c);
1679        }
1680        fputs("\n", stderr);
1681        return strbuf_detach(&buf, NULL);
1682}
1683
1684pid_t waitpid(pid_t pid, int *status, unsigned options)
1685{
1686        HANDLE h = OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION,
1687            FALSE, pid);
1688        if (!h) {
1689                errno = ECHILD;
1690                return -1;
1691        }
1692
1693        if (pid > 0 && options & WNOHANG) {
1694                if (WAIT_OBJECT_0 != WaitForSingleObject(h, 0)) {
1695                        CloseHandle(h);
1696                        return 0;
1697                }
1698                options &= ~WNOHANG;
1699        }
1700
1701        if (options == 0) {
1702                struct pinfo_t **ppinfo;
1703                if (WaitForSingleObject(h, INFINITE) != WAIT_OBJECT_0) {
1704                        CloseHandle(h);
1705                        return 0;
1706                }
1707
1708                if (status)
1709                        GetExitCodeProcess(h, (LPDWORD)status);
1710
1711                EnterCriticalSection(&pinfo_cs);
1712
1713                ppinfo = &pinfo;
1714                while (*ppinfo) {
1715                        struct pinfo_t *info = *ppinfo;
1716                        if (info->pid == pid) {
1717                                CloseHandle(info->proc);
1718                                *ppinfo = info->next;
1719                                free(info);
1720                                break;
1721                        }
1722                        ppinfo = &info->next;
1723                }
1724
1725                LeaveCriticalSection(&pinfo_cs);
1726
1727                CloseHandle(h);
1728                return pid;
1729        }
1730        CloseHandle(h);
1731
1732        errno = EINVAL;
1733        return -1;
1734}