mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 23:13:34 +00:00
f7ff77d865
- Invent iso8601us() for faster timestamps - Improve --strace descriptions of sigset_t - Rebuild the Landlock Make bootstrap binary - Introduce MODE=sysv for non-Windows builds - Permit OFD fcntl() locks under pledge(flock) - redbean can now protect your kernel from ddos - Have vfork() fallback to sys_fork() not fork() - Change kmalloc() to not die when out of memory - Improve documentation for some termios functions - Rewrite putenv() and friends to conform to POSIX - Fix linenoise + strace verbosity issue on Windows - Fix regressions in our ability to show backtraces - Change redbean SetHeader() to no-op if value is nil - Improve fcntl() so SQLite locks work in non-WAL mode - Remove some unnecessary work during fork() on Windows - Create redbean-based SSL reverse proxy for IPv4 TurfWar - Fix ape/apeinstall.sh warning when using non-bash shells - Add ProgramTrustedIp(), and IsTrustedIp() APIs to redbean - Support $PWD, $UID, $GID, and $EUID in command interpreter - Introduce experimental JTqFpD APE prefix for non-Windows builds - Invent blackhole daemon for firewalling IP addresses via UNIX named socket - Add ProgramTokenBucket(), AcquireToken(), and CountTokens() APIs to redbean
61 lines
3.1 KiB
C
61 lines
3.1 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 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/errno.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/limits.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Closes extra file descriptors, e.g.
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*
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* if (closefrom(3))
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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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* @return 0 on success, or -1 w/ errno
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* @raise EBADF if `first` is negative
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* @raise ENOSYS if not Linux 5.9+, FreeBSD 8+, OpenBSD, or NetBSD
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* @raise EBADF on OpenBSD if `first` is greater than highest fd
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* @raise EINVAL if flags are bad or first is greater than last
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* @raise EMFILE if a weird race condition happens on Linux
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* @raise EINTR possibly on OpenBSD
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* @raise ENOMEM on Linux maybe
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*/
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int closefrom(int first) {
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int rc, err;
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if (first < 0) {
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// consistent with openbsd
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// freebsd allows this but it's dangerous
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// necessary on linux due to type signature
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rc = ebadf();
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} else if (IsFreebsd() || IsOpenbsd()) {
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rc = sys_closefrom(first);
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} else if (IsLinux()) {
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rc = sys_close_range(first, 0xffffffffu, 0);
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} else if (IsNetbsd()) {
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rc = __sys_fcntl(first, 10 /*F_CLOSEM*/, first);
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} else {
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rc = enosys();
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}
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STRACE("closefrom(%d) → %d% m", first, rc);
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return rc;
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}
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