1 /*
2 * Check decoding of return values injected into a syscall that "never fails".
3 *
4 * Copyright (c) 2018 The strace developers.
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
32 #include <assert.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <asm/unistd.h>
36
37 #include "raw_syscall.h"
38
39 #ifdef __alpha__
40 /* alpha has no getpid */
41 # define SC_NR __NR_getpgrp
42 # define SC_NAME "getpgrp"
43 # define getpid getpgrp
44 #else
45 # define SC_NR __NR_getpid
46 # define SC_NAME "getpid"
47 #endif
48
49 #ifdef raw_syscall_0
50 # define INVOKE_SC(err) raw_syscall_0(SC_NR, &err)
51 #else
52 /* No raw_syscall_0, let's use getpid() and hope for the best. */
53 # define INVOKE_SC(err) getpid()
54 #endif
55
56 /*
57 * This prototype is intentionally different
58 * from the prototype provided by <unistd.h>.
59 */
60 extern kernel_ulong_t getpid(void);
61
62 int
main(int ac,char ** av)63 main(int ac, char **av)
64 {
65 assert(ac == 1 || ac == 2);
66
67 kernel_ulong_t expected =
68 (ac == 1) ? getpid() : strtoull(av[1], NULL, 0);
69 kernel_ulong_t err = 0;
70 kernel_ulong_t rc = INVOKE_SC(err);
71
72 if (err || rc != expected)
73 error_msg_and_fail("expected %#llx, got rval=%#llx err=%#llx",
74 (unsigned long long) expected,
75 (unsigned long long) rc,
76 (unsigned long long) err);
77
78 if (ac == 2) {
79 printf("%s() = %llu (INJECTED)\n",
80 SC_NAME, (unsigned long long) rc);
81
82 puts("+++ exited with 0 +++");
83 }
84
85 return 0;
86 }
87