glibc/sysdeps/unix/sysv/linux/accept4.c

/* Copyright (C) 2008-2017 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 <socketcall.h>
#include <kernel-features.h>

int
accept4 (int fd, __SOCKADDR_ARG addr, socklen_t *addr_len, int flags)
{
/* 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
  return SOCKETCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
#else
  return SYSCALL_CANCEL (accept4, fd, addr.__sockaddr__, addr_len, flags);
#endif
}