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Implement recvmmsg also as socketcall
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Andreas Schwab
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Ulrich Drepper
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May 21, 2010
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#include <kernel-features.h> | ||
#include <sys/syscall.h> | ||
#if !defined __NR_recvmmsg && defined __NR_socketcall | ||
# define socket recvmmsg | ||
# ifdef __ASSUME_RECVMMSG | ||
# define __socket recvmmsg | ||
# else | ||
# define __socket __internal_recvmmsg | ||
# endif | ||
# define NARGS 5 | ||
# define NEED_CANCELLATION | ||
# define NO_WEAK_ALIAS | ||
# include <socket.S> | ||
#endif |
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/* Copyright (C) 2010 Free Software Foundation, Inc. | ||
This file is part of the GNU C Library. | ||
Contributed by Andreas Schwab <schwab@redhat.com>, 2010. | ||
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. */ | ||
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#include <errno.h> | ||
#include <sys/socket.h> | ||
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#include <sysdep-cancel.h> | ||
#include <sys/syscall.h> | ||
#include <kernel-features.h> | ||
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#ifdef __NR_recvmmsg | ||
int | ||
recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags, | ||
const struct timespec *tmo) | ||
{ | ||
if (SINGLE_THREAD_P) | ||
return INLINE_SYSCALL (recvmmsg, 5, fd, vmessages, vlen, flags, tmo); | ||
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int oldtype = LIBC_CANCEL_ASYNC (); | ||
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int result = INLINE_SYSCALL (recvmmsg, 5, fd, vmessages, vlen, flags, tmo); | ||
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LIBC_CANCEL_RESET (oldtype); | ||
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return result; | ||
} | ||
#elif defined __NR_socketcall | ||
# ifndef __ASSUME_RECVMMSG | ||
extern int __internal_recvmmsg (int fd, struct mmsghdr *vmessages, | ||
unsigned int vlen, int flags, | ||
const struct timespec *tmo) | ||
attribute_hidden; | ||
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static int have_recvmmsg; | ||
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int | ||
recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags, | ||
const struct timespec *tmo) | ||
{ | ||
if (__builtin_expect (have_recvmmsg >= 0, 1)) | ||
{ | ||
int ret = __internal_recvmmsg (fd, vmessages, vlen, flags, tmo); | ||
/* 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_recvmmsg == 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_recvmmsg (-1, 0, 0, 0, 0); | ||
if (errno == EINVAL) | ||
{ | ||
have_recvmmsg = -1; | ||
__set_errno (ENOSYS); | ||
} | ||
else | ||
{ | ||
have_recvmmsg = 1; | ||
__set_errno (EINVAL); | ||
} | ||
return -1; | ||
} | ||
return ret; | ||
} | ||
__set_errno (ENOSYS); | ||
return -1; | ||
} | ||
# else | ||
/* When __ASSUME_RECVMMSG recvmmsg is defined in internal_recvmmsg.S. */ | ||
# endif | ||
#else | ||
int | ||
recvmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen, int flags, | ||
const struct timespec *tmo) | ||
{ | ||
__set_errno (ENOSYS); | ||
return -1; | ||
} | ||
stub_warning (recvmmsg) | ||
#endif |
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