cosmopolitan/libc/calls/chown.c

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/*-*- 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
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/errfuns.h"
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/**
* 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
*/
int chown(const char *pathname, uint32_t uid, uint32_t gid) {
if (!pathname) return efault();
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return fchownat$sysv(AT_FDCWD, pathname, uid, gid, 0);
}