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glibc/socket/opensock.c
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/* Copyright (C) 1999-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <stdio.h> | |
#include <sys/socket.h> | |
#include <libc-lock.h> | |
/* Return a socket of any type. The socket can be used in subsequent | |
ioctl calls to talk to the kernel. */ | |
int internal_function | |
__opensock (void) | |
{ | |
/* Cache the last AF that worked, to avoid many redundant calls to | |
socket(). */ | |
static int sock_af = -1; | |
int fd = -1; | |
__libc_lock_define_initialized (static, lock); | |
if (sock_af != -1) | |
{ | |
fd = __socket (sock_af, SOCK_DGRAM, 0); | |
if (fd != -1) | |
return fd; | |
} | |
__libc_lock_lock (lock); | |
if (sock_af != -1) | |
fd = __socket (sock_af, SOCK_DGRAM, 0); | |
if (fd == -1) | |
{ | |
#ifdef AF_INET | |
fd = __socket (sock_af = AF_INET, SOCK_DGRAM, 0); | |
#endif | |
#ifdef AF_INET6 | |
if (fd < 0) | |
fd = __socket (sock_af = AF_INET6, SOCK_DGRAM, 0); | |
#endif | |
#ifdef AF_IPX | |
if (fd < 0) | |
fd = __socket (sock_af = AF_IPX, SOCK_DGRAM, 0); | |
#endif | |
#ifdef AF_AX25 | |
if (fd < 0) | |
fd = __socket (sock_af = AF_AX25, SOCK_DGRAM, 0); | |
#endif | |
#ifdef AF_APPLETALK | |
if (fd < 0) | |
fd = __socket (sock_af = AF_APPLETALK, SOCK_DGRAM, 0); | |
#endif | |
} | |
__libc_lock_unlock (lock); | |
return fd; | |
} |