mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-18 03:22:40 +00:00
e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
60 lines
3 KiB
C
60 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 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/syscall-sysv.internal.h"
|
|
#include "libc/dce.h"
|
|
#include "libc/intrin/strace.internal.h"
|
|
#include "libc/sysv/errfuns.h"
|
|
|
|
/**
|
|
* Closes inclusive range of file descriptors, e.g.
|
|
*
|
|
* // close all non-stdio file descriptors
|
|
* if (close_range(3, -1, 0) == -1) {
|
|
* for (int i = 3; i < 256; ++i) {
|
|
* close(i);
|
|
* }
|
|
* }
|
|
*
|
|
* The following flags are available:
|
|
*
|
|
* - `CLOSE_RANGE_UNSHARE` (Linux-only)
|
|
* - `CLOSE_RANGE_CLOEXEC` (Linux-only)
|
|
*
|
|
* This is only supported on Linux 5.9+ and FreeBSD 13+. Consider using
|
|
* closefrom() which will work on OpenBSD too.
|
|
*
|
|
* @return 0 on success, or -1 w/ errno
|
|
* @error EINVAL if flags are bad or first is greater than last
|
|
* @error EMFILE if a weird race condition happens on Linux
|
|
* @error ENOSYS if not Linux 5.9+ or FreeBSD 13+
|
|
* @error ENOMEM on Linux maybe
|
|
* @see closefrom()
|
|
*/
|
|
int close_range(unsigned int first, unsigned int last, unsigned int flags) {
|
|
int rc;
|
|
if (IsLinux() || IsFreebsd()) {
|
|
rc = sys_close_range(first, last, flags);
|
|
} else {
|
|
rc = enosys();
|
|
}
|
|
STRACE("close_range(%d, %d, %#x) → %d% m", first, last, flags, rc);
|
|
return rc;
|
|
}
|