78 lines
3.7 KiB
C
78 lines
3.7 KiB
C
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/*-*- 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/errno.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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static textwindows int setsockopt$nt(struct Fd *fd, int level, int optname,
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const void *optval, uint32_t optlen) {
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if (__setsockopt$nt(fd->handle, level, optname, optval, optlen) != -1) {
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return 0;
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} else {
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return winsockerr();
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}
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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, IPPROTO_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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if (!level || !optname) return enoprotoopt(); /* our sysvconsts definition */
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if (optname == -1) return 0; /* our sysvconsts definition */
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if (!IsWindows()) {
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do {
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if (setsockopt$sysv(fd, level, optname, optval, optlen) != -1) {
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return 0;
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}
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} while (setsockopt_polyfill(&optname));
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return -1;
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} else if (isfdkind(fd, kFdSocket)) {
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return setsockopt$nt(&g_fds.p[fd], level, optname, optval, optlen);
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} else {
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return ebadf();
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}
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}
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