51 lines
2.8 KiB
C
51 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Changes permissions on file, e.g.:
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*
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* CHECK_NE(-1, chmod("foo/bar.txt", 0644));
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* CHECK_NE(-1, chmod("o/default/program.com", 0755));
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* CHECK_NE(-1, chmod("privatefolder/", 0700));
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*
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* The esoteric bits generally available on System Five are:
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*
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* CHECK_NE(-1, chmod("/opt/", 01000)); // sticky bit
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* CHECK_NE(-1, chmod("/usr/bin/sudo", 04755)); // setuid bit
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* CHECK_NE(-1, chmod("/usr/bin/wall", 02755)); // setgid bit
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*
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* This works on Windows NT if you ignore the error ;-)
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*
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* @param pathname must exist
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* @param mode contains octal flags (base 8)
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* @errors ENOENT, ENOTDIR, ENOSYS
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* @asyncsignalsafe
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* @see fchmod()
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* @syscall
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*/
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int chmod(const char *pathname, uint32_t mode) {
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if (!pathname) return efault();
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return fchmodat$sysv(AT_FDCWD, pathname, mode, 0);
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}
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