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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/sock/getsockopt.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/sock/internal.h"
#include "libc/sock/sock.h"
#include "libc/sysv/errfuns.h"
/**
* Retrieves socket setting.
*
* @param level can be SOL_SOCKET, IPPROTO_TCP, etc.
* @param optname can be SO_{REUSE{PORT,ADDR},KEEPALIVE,etc.} etc.
* @return 0 on success, or -1 w/ errno
* @error ENOPROTOOPT for unknown (level,optname)
* @see libc/sysv/consts.sh for tuning catalogue
* @see setsockopt()
*/
int getsockopt(int fd, int level, int optname, void *out_opt_optval,
uint32_t *out_optlen) {
if (!level || !optname) return enoprotoopt(); /* our sysvconsts definition */
if (optname == -1) return 0; /* our sysvconsts definition */
if (!IsWindows()) {
return getsockopt$sysv(fd, level, optname, out_opt_optval, out_optlen);
} else if (isfdkind(fd, kFdSocket)) {
return getsockopt$nt(&g_fds.p[fd], level, optname, out_opt_optval,
out_optlen);
} else {
return ebadf();
}
}