291 lines
6.7 KiB
HTML
291 lines
6.7 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of SOCKETCALL</TITLE>
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</HEAD><BODY>
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<H1>SOCKETCALL</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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socketcall - socket system calls
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>#include <<A HREF="file:///usr/include/linux/net.h">linux/net.h</A>></B>
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<P>
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<B>int socketcall(int </B><I>call</I><B>, unsigned long *</B><I>args</I><B>);</B>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>socketcall</B>()
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is a common kernel entry point for the socket system calls.
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<I>call</I>
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determines which socket function to invoke.
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<I>args</I>
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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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<P>
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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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<B>socketcall</B>().
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<P>
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<TABLE>
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<TR VALIGN=top><TD><I>call</I></TD><TD>Man page<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_SOCKET</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+socket">socket</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_BIND</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+bind">bind</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_CONNECT</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+connect">connect</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_LISTEN</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+listen">listen</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_ACCEPT</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+accept">accept</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_GETSOCKNAME</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+getsockname">getsockname</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_GETPEERNAME</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+getpeername">getpeername</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_SOCKETPAIR</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+socketpair">socketpair</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_SEND</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+send">send</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_RECV</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+recv">recv</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_SENDTO</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+sendto">sendto</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_RECVFROM</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+recvfrom">recvfrom</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_SHUTDOWN</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+shutdown">shutdown</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_SETSOCKOPT</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+setsockopt">setsockopt</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_GETSOCKOPT</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+getsockopt">getsockopt</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_SENDMSG</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+sendmsg">sendmsg</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_RECVMSG</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+recvmsg">recvmsg</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_ACCEPT4</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+accept4">accept4</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_RECVMMSG</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+recvmmsg">recvmmsg</A></B>(2)
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<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>SYS_SENDMMSG</B>
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</TD><TD>
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<B><A HREF="/cgi-bin/man/man2html?2+sendmmsg">sendmmsg</A></B>(2)
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<BR></TD></TR>
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</TABLE>
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<A NAME="lbAE"> </A>
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<H2>CONFORMING TO</H2>
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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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<A NAME="lbAF"> </A>
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<H2>NOTES</H2>
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On a some architectures---for example, x86-64 and ARM---there is no
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<B>socketcall</B>()
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system call; instead
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<B><A HREF="/cgi-bin/man/man2html?2+socket">socket</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+accept">accept</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+bind">bind</A></B>(2),
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and so on really are implemented as separate system calls.
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<P>
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On x86-32,
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<B>socketcall</B>()
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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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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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<B><A HREF="/cgi-bin/man/man2html?2+seccomp">seccomp</A></B>(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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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+accept">accept</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+bind">bind</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+connect">connect</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+getpeername">getpeername</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+getsockname">getsockname</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+getsockopt">getsockopt</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+listen">listen</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+recv">recv</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+recvfrom">recvfrom</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+recvmsg">recvmsg</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+send">send</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sendmsg">sendmsg</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+sendto">sendto</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+setsockopt">setsockopt</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+shutdown">shutdown</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+socket">socket</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+socketpair">socketpair</A></B>(2)
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<A NAME="lbAH"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">CONFORMING TO</A><DD>
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<DT id="5"><A HREF="#lbAF">NOTES</A><DD>
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<DT id="6"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="7"><A HREF="#lbAH">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:34 GMT, March 31, 2021
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</BODY>
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</HTML>
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