1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
.\" Copyright (c) 1995 Michael Chastain (mec@shell.portal.com), 15 April 1995.
.\"
.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, see
.\" <http://www.gnu.org/licenses/>.
.\" %%%LICENSE_END
.\"
.\" Modified Tue Oct 22 22:11:53 1996 by Eric S. Raymond <esr@thyrsus.com>
.TH SOCKETCALL 2 2017-09-15 "Linux" "Linux Programmer's Manual"
.SH NAME
socketcall \- socket system calls
.SH SYNOPSIS
.B #include <linux/net.h>
.PP
.BI "int socketcall(int " call ", unsigned long *" args );
.SH DESCRIPTION
.BR socketcall ()
is a common kernel entry point for the socket system calls.
.I call
determines which socket function to invoke.
.I args
points to a block containing the actual arguments,
which are passed through to the appropriate call.
.PP
User programs should call the appropriate functions by their usual names.
Only standard library implementors and kernel hackers need to know about
.BR socketcall ().
.PP
.TS
tab(:);
l l.
\fIcall\fR:Man page
T{
.B SYS_SOCKET
T}:T{
.BR socket (2)
T}
T{
.B SYS_BIND
T}:T{
.BR bind (2)
T}
T{
.B SYS_CONNECT
T}:T{
.BR connect (2)
T}
T{
.B SYS_LISTEN
T}:T{
.BR listen (2)
T}
T{
.B SYS_ACCEPT
T}:T{
.BR accept (2)
T}
T{
.B SYS_GETSOCKNAME
T}:T{
.BR getsockname (2)
T}
T{
.B SYS_GETPEERNAME
T}:T{
.BR getpeername (2)
T}
T{
.B SYS_SOCKETPAIR
T}:T{
.BR socketpair (2)
T}
T{
.B SYS_SEND
T}:T{
.BR send (2)
T}
T{
.B SYS_RECV
T}:T{
.BR recv (2)
T}
T{
.B SYS_SENDTO
T}:T{
.BR sendto (2)
T}
T{
.B SYS_RECVFROM
T}:T{
.BR recvfrom (2)
T}
T{
.B SYS_SHUTDOWN
T}:T{
.BR shutdown (2)
T}
T{
.B SYS_SETSOCKOPT
T}:T{
.BR setsockopt (2)
T}
T{
.B SYS_GETSOCKOPT
T}:T{
.BR getsockopt (2)
T}
T{
.B SYS_SENDMSG
T}:T{
.BR sendmsg (2)
T}
T{
.B SYS_RECVMSG
T}:T{
.BR recvmsg (2)
T}
T{
.B SYS_ACCEPT4
T}:T{
.BR accept4 (2)
T}
T{
.B SYS_RECVMMSG
T}:T{
.BR recvmmsg (2)
T}
T{
.B SYS_SENDMMSG
T}:T{
.BR sendmmsg (2)
T}
.TE
.SH CONFORMING TO
This call is specific to Linux, and should not be used in programs
intended to be portable.
.SH NOTES
On a some architectures\(emfor example, x86-64 and ARM\(emthere is no
.BR socketcall ()
system call; instead
.BR socket (2),
.BR accept (2),
.BR bind (2),
and so on really are implemented as separate system calls.
.PP
On x86-32,
.BR socketcall ()
was historically the only entry point for the sockets API.
However, starting in Linux 4.3,
.\" commit 9dea5dc921b5f4045a18c63eb92e84dc274d17eb
direct system calls are provided on x86-32 for the sockets API.
This facilitates the creation of
.BR 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.
.SH SEE ALSO
.BR accept (2),
.BR bind (2),
.BR connect (2),
.BR getpeername (2),
.BR getsockname (2),
.BR getsockopt (2),
.BR listen (2),
.BR recv (2),
.BR recvfrom (2),
.BR recvmsg (2),
.BR send (2),
.BR sendmsg (2),
.BR sendto (2),
.BR setsockopt (2),
.BR shutdown (2),
.BR socket (2),
.BR socketpair (2)
.SH COLOPHON
This page is part of release 5.10 of the Linux
.I 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/.
|
