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Add sendmmsg syscall

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This commit is contained in:
Ulrich Drepper
2011-05-28 01:43:20 -04:00
parent ce67228d57
commit f1f929d74a
8 changed files with 136 additions and 3 deletions
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96
sysdeps/unix/sysv/linux/sendmmsg.c Normal file
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/* Copyright (C) 2011 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#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;
}
#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;
}
# else
/* When __ASSUME_SENDMMSG sendmmsg is defined in internal_sendmmsg.S. */
# endif
#else
int
sendmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags)
{
__set_errno (ENOSYS);
return -1;
}
stub_warning (sendmmsg)
#endif