Name
socketcall — socket system calls
Synopsis
#include <linux/net.h> /* Definition of SYS_* constants */ #include <sys/syscall.h> /* Definition of SYS_socketcall */ #include <unistd.h>
int
syscall( |
SYS_socketcall, |
| int call, | |
unsigned long *args); |
![[Note]](../stylesheet/note.png) |
Note |
|---|---|
| glibc provides no wrapper for |
.BR socketcall (), necessitating the use of
DESCRIPTION
socketcall() is a common
kernel entry point for the socket system calls. call determines which socket
function to invoke. args points to a block
containing the actual arguments, which are passed through to
the appropriate call.
User programs should call the appropriate functions by
their usual names. Only standard library implementors and
kernel hackers need to know about socketcall().
call |
Man page |
SYS_SOCKET |
socket(2) |
SYS_BIND |
bind(2) |
SYS_CONNECT |
connect(2) |
SYS_LISTEN |
listen(2) |
SYS_ACCEPT |
accept(2) |
SYS_GETSOCKNAME |
getsockname(2) |
SYS_GETPEERNAME |
getpeername(2) |
SYS_SOCKETPAIR |
socketpair(2) |
SYS_SEND |
send(2) |
SYS_RECV |
recv(2) |
SYS_SENDTO |
sendto(2) |
SYS_RECVFROM |
recvfrom(2) |
SYS_SHUTDOWN |
shutdown(2) |
SYS_SETSOCKOPT |
setsockopt(2) |
SYS_GETSOCKOPT |
getsockopt(2) |
SYS_SENDMSG |
sendmsg(2) |
SYS_RECVMSG |
recvmsg(2) |
SYS_ACCEPT4 |
accept4(2) |
SYS_RECVMMSG |
recvmmsg(2) |
SYS_SENDMMSG |
sendmmsg(2) |
CONFORMING TO
This call is specific to Linux, and should not be used in programs intended to be portable.
NOTES
On some architectures—for example, x86-64 and
ARM—there is no socketcall() system call; instead socket(2), accept(2), bind(2), and so on really
are implemented as separate system calls.
On x86-32, socketcall() was
historically the only entry point for the sockets API.
However, starting in Linux 4.3, direct system calls are
provided on x86-32 for the sockets API. This facilitates the
creation of seccomp(2) filters that
filter sockets system calls (for new user-space binaries that
are compiled to use the new entry points) and also provides a
(very) small performance improvement.
SEE ALSO
accept(2), bind(2), connect(2), getpeername(2), getsockname(2), getsockopt(2), listen(2), recv(2), recvfrom(2), recvmsg(2), send(2), sendmsg(2), sendto(2), setsockopt(2), shutdown(2), socket(2), socketpair(2)
COLOPHON
This page is part of release 5.13 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (c) 1995 Michael Chastain (mecshell.portal.com), 15 April 1995. %%%LICENSE_START(GPLv2+_DOC_FULL) This is free documentation; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU General Public License's references to "object code" and "executables" are to be interpreted as the output of any document formatting or typesetting system, including intermediate and printed output. This manual 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this manual; if not, see <http://www.gnu.org/licenses/>. %%%LICENSE_END Modified Tue Oct 22 22:11:53 1996 by Eric S. Raymond <esrthyrsus.com> |