1 /*
2 * Check decoding of signalfd4 syscall.
3 *
4 * Copyright (c) 2015-2016 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 <fcntl.h>
32 #include <asm/unistd.h>
33
34 #if defined __NR_rt_sigprocmask \
35 && defined HAVE_SYS_SIGNALFD_H \
36 && defined HAVE_SIGNALFD \
37 && defined O_CLOEXEC
38
39 # include <signal.h>
40 # include <stdio.h>
41 # include <unistd.h>
42 # include <sys/signalfd.h>
43
44 static unsigned int
get_sigset_size(void)45 get_sigset_size(void)
46 {
47 const unsigned int big_size = 1024 / 8;
48 unsigned int set_size;
49
50 for (set_size = big_size; set_size; set_size >>= 1) {
51 if (!syscall(__NR_rt_sigprocmask, SIG_SETMASK,
52 NULL, NULL, set_size))
53 break;
54 }
55
56 if (!set_size)
57 perror_msg_and_fail("rt_sigprocmask");
58
59 return set_size;
60 }
61
62 int
main(void)63 main(void)
64 {
65 const char *const sigs = SIGUSR2 < SIGCHLD ? "USR2 CHLD" : "CHLD USR2";
66 const unsigned int size = get_sigset_size();
67
68 sigset_t mask;
69 sigemptyset(&mask);
70 sigaddset(&mask, SIGUSR2);
71 sigaddset(&mask, SIGCHLD);
72
73 int fd = signalfd(-1, &mask, O_CLOEXEC | O_NONBLOCK);
74 printf("signalfd4(-1, [%s], %u, SFD_CLOEXEC|SFD_NONBLOCK) = %s\n",
75 sigs, size, sprintrc(fd));
76
77 puts("+++ exited with 0 +++");
78 return 0;
79 }
80
81 #else
82
83 SKIP_MAIN_UNDEFINED("__NR_rt_sigprocmask && HAVE_SYS_SIGNALFD_H"
84 " && HAVE_SIGNALFD && O_CLOEXEC")
85
86 #endif
87