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 4.15 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)