mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* Copyright (C) 1999-2020 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
|
|
<https://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;
|
|
}
|