socketcall

SOCKETCALL(2)               Linux Programmer's Manual              SOCKETCALL(2)



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().

       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 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 5.10 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/.



Linux                              2017-09-15                      SOCKETCALL(2)