/* Copyright (C) 1999-2018 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 __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; }