1SOCKETCALL(2)              Linux Programmer's Manual             SOCKETCALL(2)
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NAME

6       socketcall - socket system calls
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SYNOPSIS

9       #include <linux/net.h>
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11       int socketcall(int call, unsigned long *args);
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DESCRIPTION

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

46       This call is specific to Linux, and should  not  be  used  in  programs
47       intended to be portable.
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NOTES

50       On a some architectures—for example, x86-64 and ARM—there is no socket‐
51       call() system call; instead socket(2), accept(2), bind(2),  and  so  on
52       really are implemented as separate system calls.
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54       On  x86-32,  socketcall() was historically the only entry point for the
55       sockets API.  However, starting in Linux 4.3, direct system  calls  are
56       provided  on x86-32 for the sockets API.  This facilitates the creation
57       of seccomp(2) filters that filter sockets system calls (for  new  user-
58       space  binaries that are compiled to use the new entry points) and also
59       provides a (very) small performance improvement.
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SEE ALSO

62       accept(2), bind(2), connect(2),  getpeername(2),  getsockname(2),  get‐
63       sockopt(2),   listen(2),  recv(2),  recvfrom(2),  recvmsg(2),  send(2),
64       sendmsg(2), sendto(2), setsockopt(2), shutdown(2),  socket(2),  socket‐
65       pair(2)
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COLOPHON

68       This  page  is  part of release 5.04 of the Linux man-pages project.  A
69       description of the project, information about reporting bugs,  and  the
70       latest     version     of     this    page,    can    be    found    at
71       https://www.kernel.org/doc/man-pages/.
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75Linux                             2017-09-15                     SOCKETCALL(2)