1socketcall(2)                 System Calls Manual                socketcall(2)
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NAME

6       socketcall - socket system calls
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <linux/net.h>        /* Definition of SYS_* constants */
13       #include <sys/syscall.h>      /* Definition of SYS_socketcall */
14       #include <unistd.h>
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16       int syscall(SYS_socketcall, int call, unsigned long *args);
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18       Note: glibc provides no wrapper for socketcall(), necessitating the use
19       of syscall(2).
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DESCRIPTION

22       socketcall() is a common kernel  entry  point  for  the  socket  system
23       calls.   call  determines which socket function to invoke.  args points
24       to a block containing the actual arguments, which are passed through to
25       the appropriate call.
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27       User  programs  should  call  the  appropriate functions by their usual
28       names.  Only standard library implementors and kernel hackers  need  to
29       know about socketcall().
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31       call              Man page
32       SYS_SOCKET        socket(2)
33       SYS_BIND          bind(2)
34       SYS_CONNECT       connect(2)
35       SYS_LISTEN        listen(2)
36       SYS_ACCEPT        accept(2)
37       SYS_GETSOCKNAME   getsockname(2)
38       SYS_GETPEERNAME   getpeername(2)
39       SYS_SOCKETPAIR    socketpair(2)
40       SYS_SEND          send(2)
41       SYS_RECV          recv(2)
42       SYS_SENDTO        sendto(2)
43       SYS_RECVFROM      recvfrom(2)
44       SYS_SHUTDOWN      shutdown(2)
45       SYS_SETSOCKOPT    setsockopt(2)
46       SYS_GETSOCKOPT    getsockopt(2)
47       SYS_SENDMSG       sendmsg(2)
48       SYS_RECVMSG       recvmsg(2)
49       SYS_ACCEPT4       accept4(2)
50       SYS_RECVMMSG      recvmmsg(2)
51       SYS_SENDMMSG      sendmmsg(2)
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VERSIONS

54       On  some  architectures—for example, x86-64 and ARM—there is no socket‐
55       call() system call; instead socket(2), accept(2), bind(2),  and  so  on
56       really are implemented as separate system calls.
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STANDARDS

59       Linux.
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61       On  x86-32,  socketcall() was historically the only entry point for the
62       sockets API.  However, starting in Linux 4.3, direct system  calls  are
63       provided  on x86-32 for the sockets API.  This facilitates the creation
64       of seccomp(2) filters that filter sockets system calls (for  new  user-
65       space  binaries that are compiled to use the new entry points) and also
66       provides a (very) small performance improvement.
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SEE ALSO

69       accept(2), bind(2), connect(2),  getpeername(2),  getsockname(2),  get‐
70       sockopt(2),   listen(2),  recv(2),  recvfrom(2),  recvmsg(2),  send(2),
71       sendmsg(2), sendto(2), setsockopt(2), shutdown(2),  socket(2),  socket‐
72       pair(2)
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76Linux man-pages 6.04              2023-03-30                     socketcall(2)
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