mirror of
https://github.com/jart/cosmopolitan.git
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2046c0d2ae
- Expand redbean UNIX module - Expand redbean documentation - Ensure Lua copyright is embedded in binary - Increase the PATH_MAX limit especially on NT - Use column major sorting for linenoise completions - Fix some suboptimalities in redbean's new UNIX API - Figured out right flags for Multics newline in raw mode
83 lines
3.9 KiB
C
83 lines
3.9 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/bits/weaken.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/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/sock/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 socket,
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* accept, epoll_create, and zipos file descriptors too.
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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 (possibly
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* because linger is enabled) in which case close() does not need to
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* be called again, since the fd will close in the background, and
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* chances are that on linux, the fd is already closed, even if the
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* underlying resource isn't closed yet
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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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if (fd < g_fds.n && g_fds.p[fd].kind == 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 (fd < g_fds.n && g_fds.p[fd].kind == kFdEpoll) {
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rc = weaken(sys_close_epoll_nt)(fd);
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} else if (fd < g_fds.n && g_fds.p[fd].kind == kFdSocket) {
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rc = weaken(sys_closesocket_nt)(g_fds.p + fd);
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} else if (fd < g_fds.n && (g_fds.p[fd].kind == kFdFile ||
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g_fds.p[fd].kind == kFdConsole ||
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g_fds.p[fd].kind == kFdProcess)) {
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rc = sys_close_nt(g_fds.p + fd);
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} else {
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STRACE("close(%d) unknown kind: %d", fd, g_fds.p[fd].kind);
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rc = ebadf();
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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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