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fea681da MK |
1 | .\" Copyright (c) 1995 Michael Chastain (mec@shell.portal.com), 15 April 1995. |
2 | .\" | |
e4a74ca8 | 3 | .\" SPDX-License-Identifier: GPL-2.0-or-later |
fea681da MK |
4 | .\" |
5 | .\" Modified Tue Oct 22 22:11:53 1996 by Eric S. Raymond <esr@thyrsus.com> | |
45186a5d | 6 | .TH SOCKETCALL 2 2021-03-22 "Linux man-pages (unreleased)" |
fea681da MK |
7 | .SH NAME |
8 | socketcall \- socket system calls | |
4b0ab5ad AC |
9 | .SH LIBRARY |
10 | Standard C library | |
8fc3b2cf | 11 | .RI ( libc ", " \-lc ) |
fea681da | 12 | .SH SYNOPSIS |
c7db92b9 | 13 | .nf |
b6687e39 AC |
14 | .BR "#include <linux/net.h>" " /* Definition of " SYS_* " constants */" |
15 | .BR "#include <sys/syscall.h>" " /* Definition of " SYS_socketcall " */" | |
16 | .B #include <unistd.h> | |
68e4db0a | 17 | .PP |
b6687e39 | 18 | .BI "int syscall(SYS_socketcall, int " call ", unsigned long *" args ); |
c7db92b9 | 19 | .fi |
fa50e159 AC |
20 | .PP |
21 | .IR Note : | |
b6687e39 AC |
22 | glibc provides no wrapper for |
23 | .BR socketcall (), | |
24 | necessitating the use of | |
25 | .BR syscall (2). | |
fea681da | 26 | .SH DESCRIPTION |
e511ffb6 | 27 | .BR socketcall () |
fea681da MK |
28 | is a common kernel entry point for the socket system calls. |
29 | .I call | |
30 | determines which socket function to invoke. | |
31 | .I args | |
32 | points to a block containing the actual arguments, | |
33 | which are passed through to the appropriate call. | |
34 | .PP | |
35 | User programs should call the appropriate functions by their usual names. | |
36 | Only standard library implementors and kernel hackers need to know about | |
e511ffb6 | 37 | .BR socketcall (). |
f576fff5 MF |
38 | .PP |
39 | .TS | |
40 | tab(:); | |
41 | l l. | |
42 | \fIcall\fR:Man page | |
43 | T{ | |
44 | .B SYS_SOCKET | |
45 | T}:T{ | |
46 | .BR socket (2) | |
47 | T} | |
48 | T{ | |
49 | .B SYS_BIND | |
50 | T}:T{ | |
51 | .BR bind (2) | |
52 | T} | |
53 | T{ | |
54 | .B SYS_CONNECT | |
55 | T}:T{ | |
56 | .BR connect (2) | |
57 | T} | |
58 | T{ | |
59 | .B SYS_LISTEN | |
60 | T}:T{ | |
61 | .BR listen (2) | |
62 | T} | |
63 | T{ | |
64 | .B SYS_ACCEPT | |
65 | T}:T{ | |
66 | .BR accept (2) | |
67 | T} | |
68 | T{ | |
69 | .B SYS_GETSOCKNAME | |
70 | T}:T{ | |
71 | .BR getsockname (2) | |
72 | T} | |
73 | T{ | |
74 | .B SYS_GETPEERNAME | |
75 | T}:T{ | |
76 | .BR getpeername (2) | |
77 | T} | |
78 | T{ | |
79 | .B SYS_SOCKETPAIR | |
80 | T}:T{ | |
81 | .BR socketpair (2) | |
82 | T} | |
83 | T{ | |
84 | .B SYS_SEND | |
85 | T}:T{ | |
86 | .BR send (2) | |
87 | T} | |
88 | T{ | |
89 | .B SYS_RECV | |
90 | T}:T{ | |
91 | .BR recv (2) | |
92 | T} | |
93 | T{ | |
94 | .B SYS_SENDTO | |
95 | T}:T{ | |
96 | .BR sendto (2) | |
97 | T} | |
98 | T{ | |
99 | .B SYS_RECVFROM | |
100 | T}:T{ | |
101 | .BR recvfrom (2) | |
102 | T} | |
103 | T{ | |
104 | .B SYS_SHUTDOWN | |
105 | T}:T{ | |
106 | .BR shutdown (2) | |
107 | T} | |
108 | T{ | |
109 | .B SYS_SETSOCKOPT | |
110 | T}:T{ | |
111 | .BR setsockopt (2) | |
112 | T} | |
113 | T{ | |
114 | .B SYS_GETSOCKOPT | |
115 | T}:T{ | |
116 | .BR getsockopt (2) | |
117 | T} | |
118 | T{ | |
119 | .B SYS_SENDMSG | |
120 | T}:T{ | |
121 | .BR sendmsg (2) | |
122 | T} | |
123 | T{ | |
124 | .B SYS_RECVMSG | |
125 | T}:T{ | |
126 | .BR recvmsg (2) | |
127 | T} | |
128 | T{ | |
129 | .B SYS_ACCEPT4 | |
130 | T}:T{ | |
131 | .BR accept4 (2) | |
132 | T} | |
133 | T{ | |
134 | .B SYS_RECVMMSG | |
135 | T}:T{ | |
136 | .BR recvmmsg (2) | |
137 | T} | |
138 | T{ | |
139 | .B SYS_SENDMMSG | |
140 | T}:T{ | |
141 | .BR sendmmsg (2) | |
142 | T} | |
143 | .TE | |
3113c7f3 | 144 | .SH STANDARDS |
fea681da MK |
145 | This call is specific to Linux, and should not be used in programs |
146 | intended to be portable. | |
bf25f45c | 147 | .SH NOTES |
0181a85a | 148 | On some architectures\(emfor example, x86-64 and ARM\(emthere is no |
bf25f45c MK |
149 | .BR socketcall () |
150 | system call; instead | |
151 | .BR socket (2), | |
152 | .BR accept (2), | |
153 | .BR bind (2), | |
154 | and so on really are implemented as separate system calls. | |
efeece04 | 155 | .PP |
b08d144c MK |
156 | On x86-32, |
157 | .BR socketcall () | |
158 | was historically the only entry point for the sockets API. | |
159 | However, starting in Linux 4.3, | |
160 | .\" commit 9dea5dc921b5f4045a18c63eb92e84dc274d17eb | |
161 | direct system calls are provided on x86-32 for the sockets API. | |
162 | This facilitates the creation of | |
163 | .BR seccomp (2) | |
164 | filters that filter sockets system calls | |
165 | (for new user-space binaries that are compiled | |
166 | to use the new entry points) | |
167 | and also provides a (very) small performance improvement. | |
47297adb | 168 | .SH SEE ALSO |
fea681da MK |
169 | .BR accept (2), |
170 | .BR bind (2), | |
171 | .BR connect (2), | |
172 | .BR getpeername (2), | |
173 | .BR getsockname (2), | |
174 | .BR getsockopt (2), | |
175 | .BR listen (2), | |
176 | .BR recv (2), | |
177 | .BR recvfrom (2), | |
ed2a6c73 | 178 | .BR recvmsg (2), |
fea681da | 179 | .BR send (2), |
ed2a6c73 | 180 | .BR sendmsg (2), |
f0c34053 | 181 | .BR sendto (2), |
fea681da MK |
182 | .BR setsockopt (2), |
183 | .BR shutdown (2), | |
184 | .BR socket (2), | |
185 | .BR socketpair (2) |