mirror of https://github.com/mkerrisk/man-pages
84 lines
2.7 KiB
Groff
84 lines
2.7 KiB
Groff
.\" Copyright (c) 1995 Michael Chastain (mec@shell.portal.com), 15 April 1995.
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, see
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.\" <http://www.gnu.org/licenses/>.
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.\" %%%LICENSE_END
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.\"
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.\" Modified Tue Oct 22 22:11:53 1996 by Eric S. Raymond <esr@thyrsus.com>
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.TH SOCKETCALL 2 2015-12-28 "Linux" "Linux Programmer's Manual"
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.SH NAME
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socketcall \- socket system calls
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.SH SYNOPSIS
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.BI "int socketcall(int " call ", unsigned long *" args );
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.SH DESCRIPTION
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.BR socketcall ()
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is a common kernel entry point for the socket system calls.
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.I call
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determines which socket function to invoke.
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.I args
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points to a block containing the actual arguments,
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which are passed through to the appropriate call.
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.PP
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User programs should call the appropriate functions by their usual names.
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Only standard library implementors and kernel hackers need to know about
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.BR socketcall ().
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.SH CONFORMING TO
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This call is specific to Linux, and should not be used in programs
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intended to be portable.
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.SH NOTES
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On a some architectures\(emfor example, x86-64 and ARM\(emthere is no
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.BR socketcall ()
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system call; instead
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.BR socket (2),
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.BR accept (2),
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.BR bind (2),
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and so on really are implemented as separate system calls.
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On x86-32,
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.BR socketcall ()
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was historically the only entry point for the sockets API.
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However, starting in Linux 4.3,
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.\" commit 9dea5dc921b5f4045a18c63eb92e84dc274d17eb
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direct system calls are provided on x86-32 for the sockets API.
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This facilitates the creation of
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.BR seccomp (2)
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filters that filter sockets system calls
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(for new user-space binaries that are compiled
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to use the new entry points)
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and also provides a (very) small performance improvement.
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.SH SEE ALSO
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.BR accept (2),
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.BR bind (2),
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.BR connect (2),
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.BR getpeername (2),
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.BR getsockname (2),
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.BR getsockopt (2),
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.BR listen (2),
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.BR recv (2),
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.BR recvfrom (2),
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.BR recvmsg (2),
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.BR send (2),
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.BR sendmsg (2),
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.BR sendto (2),
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.BR setsockopt (2),
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.BR shutdown (2),
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.BR socket (2),
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.BR socketpair (2)
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