mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-30 00:31:08 +00:00
94 lines
2.8 KiB
C
94 lines
2.8 KiB
C
/* Copyright (C) 2011-2016 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>
|
|
|
|
/* Do not use the sendmmsg syscall on socketcall architectures unless
|
|
it was added at the same time as the socketcall support or can be
|
|
assumed to be present. */
|
|
#if defined __ASSUME_SOCKETCALL \
|
|
&& !defined __ASSUME_SENDMMSG_SYSCALL_WITH_SOCKETCALL \
|
|
&& !defined __ASSUME_SENDMMSG_SYSCALL
|
|
# undef __NR_sendmmsg
|
|
#endif
|
|
|
|
#ifdef __NR_sendmmsg
|
|
int
|
|
__sendmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags)
|
|
{
|
|
return SYSCALL_CANCEL (sendmmsg, fd, vmessages, vlen, flags);
|
|
}
|
|
libc_hidden_def (__sendmmsg)
|
|
weak_alias (__sendmmsg, sendmmsg)
|
|
#elif defined __NR_socketcall
|
|
# include <socketcall.h>
|
|
# ifdef __ASSUME_SENDMMSG_SOCKETCALL
|
|
int
|
|
__sendmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags)
|
|
{
|
|
return SOCKETCALL_CANCEL (sendmmsg, fd, vmessages, vlen, flags);
|
|
}
|
|
# else
|
|
static int have_sendmmsg;
|
|
|
|
int
|
|
__sendmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags)
|
|
{
|
|
if (__glibc_likely (have_sendmmsg >= 0))
|
|
{
|
|
int ret = SOCKETCALL_CANCEL (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 = SOCKETCALL_CANCEL (invalid, -1);
|
|
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;
|
|
}
|
|
# endif /* __ASSUME_SENDMMSG_SOCKETCALL */
|
|
libc_hidden_def (__sendmmsg)
|
|
weak_alias (__sendmmsg, sendmmsg)
|
|
#else
|
|
# include <socket/sendmmsg.c>
|
|
#endif
|