mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* Copyright (C) 2008-2016 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2008.
|
|
|
|
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 <signal.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <sysdep-cancel.h>
|
|
#include <sys/syscall.h>
|
|
#include <kernel-features.h>
|
|
|
|
/* Do not use the accept4 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_ACCEPT4_SYSCALL_WITH_SOCKETCALL \
|
|
&& !defined __ASSUME_ACCEPT4_SYSCALL
|
|
# undef __NR_accept4
|
|
#endif
|
|
|
|
#ifdef __NR_accept4
|
|
int
|
|
accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
|
|
{
|
|
return SYSCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
|
|
}
|
|
#elif defined __NR_socketcall
|
|
# include <socketcall.h>
|
|
# ifdef __ASSUME_ACCEPT4_SOCKETCALL
|
|
int
|
|
accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
|
|
{
|
|
return SOCKETCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
|
|
}
|
|
# else
|
|
static int have_accept4;
|
|
|
|
int
|
|
accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
|
|
{
|
|
if (__glibc_likely (have_accept4 >= 0))
|
|
{
|
|
int ret = SOCKETCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len,
|
|
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_accept4 == 0
|
|
&& errno == EINVAL)
|
|
{
|
|
/* Try another call, this time with the FLAGS parameter
|
|
cleared and an invalid file descriptor. This call will not
|
|
cause any harm and it will return immediately. */
|
|
ret = SOCKETCALL_CANCEL (invalid, -1);
|
|
if (errno == EINVAL)
|
|
{
|
|
have_accept4 = -1;
|
|
__set_errno (ENOSYS);
|
|
}
|
|
else
|
|
{
|
|
have_accept4 = 1;
|
|
__set_errno (EINVAL);
|
|
}
|
|
return -1;
|
|
}
|
|
return ret;
|
|
}
|
|
__set_errno (ENOSYS);
|
|
return -1;
|
|
}
|
|
# endif /* __ASSUME_ACCEPT4_SOCKETCALL */
|
|
#else /* __NR_socketcall */
|
|
int
|
|
accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
|
|
{
|
|
__set_errno (ENOSYS);
|
|
return -1;
|
|
}
|
|
stub_warning (accept4)
|
|
#endif
|