SOCKETCALL
Section: Linux Programmer's Manual (2)
Updated: 2017-09-15
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NAME
socketcall - socket system calls
SYNOPSIS
#include <linux/net.h>
int socketcall(int call, unsigned long *args);
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().
CONFORMING TO
This call is specific to Linux, and should not be used in programs
intended to be portable.
NOTES
On a 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 4.13 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
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