sortix-mirror/libc/sys/socket/accept4.c

41 lines
1.6 KiB
C

/*
* Copyright (c) 2013 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* sys/socket/accept4.c
* Accepts a connection from a listening socket.
*/
#include <sys/socket.h>
#include <sys/syscall.h>
#include <stddef.h>
DEFN_SYSCALL4(int, sys_accept4, SYSCALL_ACCEPT4, int, void*, size_t*, int);
int accept4(int fd, struct sockaddr* restrict addr, socklen_t* restrict addrlen,
int flags)
{
// Deal with that the kernel doesn't need to understand socklen_t. Since
// that type is designed to be size_t-sized anyway, the compiler should be
// able to optimize all this type safety away, but this function will work
// should the assumption sizeof(size_t) == sizeof(socklen_t) change.
size_t addrlen_size_t = addrlen ? *addrlen : 0;
size_t* addrlen_size_t_ptr = addrlen ? &addrlen_size_t : NULL;
int retfd = sys_accept4(fd, addr, addrlen_size_t_ptr, flags);
if ( addrlen )
*addrlen = addrlen_size_t;
return retfd;
}