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 */
39int
40socketcall(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