1 /* 2 * Check decoding of signalfd4 syscall. 3 * 4 * Copyright (c) 2015-2016 Dmitry V. Levin <ldv (at) 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 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 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
