| /* Copyright (C) 2011-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. |
| |
| 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 <errno.h> |
| #include <sys/socket.h> |
| |
| #include <sysdep-cancel.h> |
| #include <sys/syscall.h> |
| #include <kernel-features.h> |
| |
| |
| #ifdef __NR_sendmmsg |
| int |
| __sendmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags) |
| { |
| if (SINGLE_THREAD_P) |
| return INLINE_SYSCALL (sendmmsg, 4, fd, vmessages, vlen, flags); |
| |
| int oldtype = LIBC_CANCEL_ASYNC (); |
| |
| int result = INLINE_SYSCALL (sendmmsg, 4, fd, vmessages, vlen, flags); |
| |
| LIBC_CANCEL_RESET (oldtype); |
| |
| return result; |
| } |
| libc_hidden_def (__sendmmsg) |
| weak_alias (__sendmmsg, sendmmsg) |
| #elif defined __NR_socketcall |
| # ifndef __ASSUME_SENDMMSG |
| extern int __internal_sendmmsg (int fd, struct mmsghdr *vmessages, |
| unsigned int vlen, int flags) |
| attribute_hidden; |
| |
| static int have_sendmmsg; |
| |
| int |
| __sendmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags) |
| { |
| if (__builtin_expect (have_sendmmsg >= 0, 1)) |
| { |
| int ret = __internal_sendmmsg (fd, vmessages, vlen, flags); |
| /* The kernel returns -EINVAL for unknown socket operations. |
| We need to convert that error to an ENOSYS error. */ |
| if (__builtin_expect (ret < 0, 0) |
| && have_sendmmsg == 0 |
| && errno == EINVAL) |
| { |
| /* Try another call, this time with an invalid file |
| descriptor and all other parameters cleared. This call |
| will not cause any harm and it will return |
| immediately. */ |
| ret = __internal_sendmmsg (-1, 0, 0, 0); |
| if (errno == EINVAL) |
| { |
| have_sendmmsg = -1; |
| __set_errno (ENOSYS); |
| } |
| else |
| { |
| have_sendmmsg = 1; |
| __set_errno (EINVAL); |
| } |
| return -1; |
| } |
| return ret; |
| } |
| __set_errno (ENOSYS); |
| return -1; |
| } |
| libc_hidden_def (__sendmmsg) |
| weak_alias (__sendmmsg, sendmmsg) |
| # else |
| /* When __ASSUME_SENDMMSG sendmmsg is defined in internal_sendmmsg.S. */ |
| # endif |
| #else |
| # include <socket/sendmmsg.c> |
| #endif |
