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https://github.com/jart/cosmopolitan.git
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6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
88 lines
4 KiB
C
88 lines
4 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/syscall-nt.internal.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.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/sock/syscall_fd.internal.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Closes file descriptor.
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*
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* This function may be used for file descriptors returned by functions
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* like open, socket, accept, epoll_create, and landlock_create_ruleset.
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*
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* This function should never be called twice for the same file
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* descriptor, regardless of whether or not an error happened. However
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* that doesn't mean the error should be ignored.
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*
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* @return 0 on success, or -1 w/ errno
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* @error EINTR means a signal was received while closing in which case
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* close() does not need to be called again, since the fd will close
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* in the background
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* @asyncsignalsafe
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* @vforksafe
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*/
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int close(int fd) {
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int rc;
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if (fd == -1) {
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rc = 0;
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} else if (fd < 0) {
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rc = einval();
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} else {
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// for performance reasons we want to avoid holding __fds_lock()
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// while sys_close() is happening. this leaves the kernel / libc
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// having a temporarily inconsistent state. routines that obtain
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// file descriptors the way __zipos_open() does need to retry if
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// there's indication this race condition happened.
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if (__isfdkind(fd, kFdZip)) {
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rc = _weaken(__zipos_close)(fd);
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} else {
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if (!IsWindows() && !IsMetal()) {
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rc = sys_close(fd);
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} else if (IsMetal()) {
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rc = 0;
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} else {
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if (__isfdkind(fd, kFdEpoll)) {
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rc = _weaken(sys_close_epoll_nt)(fd);
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} else if (__isfdkind(fd, kFdSocket)) {
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rc = _weaken(sys_closesocket_nt)(g_fds.p + fd);
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} else if (__isfdkind(fd, kFdFile) || //
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__isfdkind(fd, kFdConsole) || //
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__isfdkind(fd, kFdProcess)) { //
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rc = sys_close_nt(g_fds.p + fd);
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} else {
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rc = eio();
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}
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}
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}
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if (!__vforked) {
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__releasefd(fd);
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}
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}
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STRACE("%s(%d) → %d% m", "close", fd, rc);
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return rc;
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}
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