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