src/system/libroot/posix/unistd/chown.c

   1 /*
   2  * Copyright 2002-2009, Axel Dörfler, axeld@pinc-software.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include <errno.h>
   8 #include <unistd.h>
   9
  10 #include <NodeMonitor.h>
  11
  12 #include <errno_private.h>
  13 #include <syscalls.h>
  14 #include <syscall_utils.h>
  15
  16
  17 static int
  18 common_chown(int fd, const char* path, bool followLinks, uid_t owner,
  19         gid_t group)
  20 {
  21         struct stat stat;
  22         status_t status;
  23
  24         int mask = 0;
  25         if (owner != (uid_t)-1) {
  26                 stat.st_uid = owner;
  27                 mask |= B_STAT_UID;
  28         }
  29         if (group != (gid_t)-1) {
  30                 stat.st_gid = group;
  31                 mask |= B_STAT_GID;
  32         }
  33
  34         status = _kern_write_stat(fd, path, followLinks, &stat,
  35                 sizeof(struct stat), mask);
  36
  37         RETURN_AND_SET_ERRNO(status);
  38 }
  39
  40
  41 int
  42 chown(const char *path, uid_t owner, gid_t group)
  43 {
  44         return common_chown(-1, path, true, owner, group);
  45 }
  46
  47
  48 int
  49 lchown(const char *path, uid_t owner, gid_t group)
  50 {
  51         return common_chown(-1, path, false, owner, group);
  52 }
  53
  54
  55 int
  56 fchown(int fd, uid_t owner, gid_t group)
  57 {
  58         return common_chown(fd, NULL, false, owner, group);
  59 }
  60
  61
  62 int
  63 fchownat(int fd, const char* path, uid_t owner, gid_t group, int flag)
  64 {
  65         return common_chown(fd, path, (flag & AT_SYMLINK_NOFOLLOW) == 0, owner,
  66                 group);
  67 }