cosmopolitan/libc/calls/chown.c

41 lines
2.5 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/errfuns.h"
/**
* Changes owner and/or group of pathname.
*
* @param uid is user id, or -1u to not change
* @param gid is group id, or -1u to not change
* @return 0 on success, or -1 w/ errno
* @see fchown() if pathname is already open()'d
* @see lchown() which does not dereference symbolic links
* @see /etc/passwd for user ids
* @see /etc/group for group ids
* @asyncsignalsafe
* @syscall
*/
int chown(const char *pathname, uint32_t uid, uint32_t gid) {
if (!pathname) return efault();
return fchownat$sysv(AT_FDCWD, pathname, uid, gid, 0);
}