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
92 lines
3.9 KiB
C
92 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/calls/internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/magnumstrs.internal.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/nt/winsock.h"
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#include "libc/sock/internal.h"
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#include "libc/sock/sock.h"
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#include "libc/sysv/consts/so.h"
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#include "libc/sysv/errfuns.h"
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static bool setsockopt_polyfill(int *optname) {
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if (errno == ENOPROTOOPT && *optname == SO_REUSEPORT /* RHEL5 */) {
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*optname = SO_REUSEADDR; /* close enough */
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return true; /* fudges errno */
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}
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return false;
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}
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/**
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* Modifies socket settings.
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*
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* This function is the ultimate rabbit hole. Basic usage:
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*
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* int yes = 1;
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* setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes));
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*
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* @param level can be SOL_SOCKET, SOL_IP, SOL_TCP, etc.
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* @param optname can be SO_{REUSE{PORT,ADDR},KEEPALIVE,etc.} etc.
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* @return 0 on success, or -1 w/ errno
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* @error ENOPROTOOPT for unknown (level,optname)
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* @see libc/sysv/consts.sh for tuning catalogue
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* @see getsockopt()
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*/
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int setsockopt(int fd, int level, int optname, const void *optval,
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uint32_t optlen) {
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int e, rc;
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if (!optname) {
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rc = enosys(); /* see libc/sysv/consts.sh */
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} else if ((!optval && optlen) ||
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(IsAsan() && !__asan_is_valid(optval, optlen))) {
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rc = efault();
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} else if (!IsWindows()) {
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rc = -1;
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e = errno;
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do {
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if (sys_setsockopt(fd, level, optname, optval, optlen) != -1) {
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errno = e;
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rc = 0;
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break;
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}
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} while (setsockopt_polyfill(&optname));
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} else if (__isfdkind(fd, kFdSocket)) {
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rc = sys_setsockopt_nt(&g_fds.p[fd], level, optname, optval, optlen);
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} else {
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rc = ebadf();
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}
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#ifdef SYSDEBUG
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if (!(rc == -1 && errno == EFAULT)) {
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STRACE("setsockopt(%d, %s, %s, %#.*hhs, %'u) → %d% lm", fd,
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DescribeSockLevel(level), DescribeSockOptname(level, optname),
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optlen, optval, optlen, rc);
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} else {
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STRACE("setsockopt(%d, %s, %s, %p, %'u) → %d% lm", fd,
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DescribeSockLevel(level), DescribeSockOptname(level, optname),
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optval, optlen, rc);
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}
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#endif
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return rc;
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}
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