socketcall(2) - Linux manual page (original) (raw)

socketcall(2) System Calls Manual socketcall(2)

NAME top

   socketcall - socket system calls

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#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_: glibc provides no wrapper for **socketcall**(), necessitating
   the use of [syscall(2)](../man2/syscall.2.html).

DESCRIPTION top

   **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)

VERSIONS top

   On some architectures—for example, x86-64 and ARM—there is no
   **socketcall**() system call; instead [socket(2)](../man2/socket.2.html), [accept(2)](../man2/accept.2.html), [bind(2)](../man2/bind.2.html),
   and so on really are implemented as separate system calls.

STANDARDS top

   Linux.

   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)](../man2/seccomp.2.html) 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 top

   [accept(2)](../man2/accept.2.html), [bind(2)](../man2/bind.2.html), [connect(2)](../man2/connect.2.html), [getpeername(2)](../man2/getpeername.2.html), [getsockname(2)](../man2/getsockname.2.html),
   [getsockopt(2)](../man2/getsockopt.2.html), [listen(2)](../man2/listen.2.html), [recv(2)](../man2/recv.2.html), [recvfrom(2)](../man2/recvfrom.2.html), [recvmsg(2)](../man2/recvmsg.2.html),
   [send(2)](../man2/send.2.html), [sendmsg(2)](../man2/sendmsg.2.html), [sendto(2)](../man2/sendto.2.html), [setsockopt(2)](../man2/setsockopt.2.html), [shutdown(2)](../man2/shutdown.2.html),
   [socket(2)](../man2/socket.2.html), [socketpair(2)](../man2/socketpair.2.html)

COLOPHON top

   This page is part of the _man-pages_ (Linux kernel and C library
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   man-pages@man7.org

Linux man-pages 6.10 2024-07-23 socketcall(2)

Pages that refer to this page:syscalls(2), seccomp_syscall_resolve_name(3)