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