1 /*
2  * Invoke a socket syscall, either directly or via __NR_socketcall.
3  *
4  * Copyright (c) 2016 Dmitry V. Levin <ldv@altlinux.org>
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  *    derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #include "tests.h"
31 #include <errno.h>
32 #include <unistd.h>
33 #include <asm/unistd.h>
34 
35 /*
36  * Invoke a socket syscall, either directly or via __NR_socketcall.
37  * if nr == -1, no direct syscall invocation will be made.
38  */
39 int
40 socketcall(const int nr, const int call,
41 	   long a1, long a2, long a3, long a4, long a5)
42 {
43 	int rc = -1;
44 	errno = ENOSYS;
45 
46 # ifdef __NR_socketcall
47 	static int have_socketcall = -1;
48 
49 	if (have_socketcall < 0) {
50 		if (syscall(__NR_socketcall, 0L, 0L, 0L, 0L, 0L) < 0
51 		    && EINVAL == errno) {
52 			have_socketcall = 1;
53 		} else {
54 			have_socketcall = 0;
55 		}
56 	}
57 
58 	if (have_socketcall) {
59 		const long args[] = { a1, a2, a3, a4, a5 };
60 		rc = syscall(__NR_socketcall, call, args);
61 	} else
62 # endif
63 	{
64 		if (nr != -1)
65 			rc = syscall(nr, a1, a2, a3, a4, a5);
66 	}
67 
68 	return rc;
69 }
70