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      1 /*
      2  * Check decoding of sigsuspend syscall.
      3  *
      4  * Copyright (c) 2017 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 <asm/unistd.h>
     32 
     33 #ifdef __NR_sigsuspend
     34 
     35 # include <assert.h>
     36 # include <errno.h>
     37 # include <signal.h>
     38 # include <stdio.h>
     39 # include <stdint.h>
     40 # include <string.h>
     41 # include <unistd.h>
     42 
     43 # ifdef MIPS
     44 #  define SIGNAL_MASK_BY_REF 1
     45 # else
     46 #  define SIGNAL_MASK_BY_REF 0
     47 # endif
     48 
     49 static long
     50 k_sigsuspend(const kernel_ulong_t arg1,
     51 	     const kernel_ulong_t arg2,
     52 	     const kernel_ulong_t arg3)
     53 {
     54 	return syscall(__NR_sigsuspend, arg1, arg2, arg3);
     55 }
     56 
     57 static int signo;
     58 static const char *sigtxt[] = {
     59 	[SIGUSR1] = "USR1",
     60 	[SIGUSR2] = "USR2"
     61 };
     62 
     63 static void
     64 handler(int i)
     65 {
     66 	signo = i;
     67 }
     68 
     69 int
     70 main(void)
     71 {
     72 	union {
     73 		sigset_t libc_mask;
     74 		unsigned long old_mask;
     75 	} u;
     76 
     77 	sigemptyset(&u.libc_mask);
     78 	sigaddset(&u.libc_mask, SIGUSR1);
     79 	sigaddset(&u.libc_mask, SIGUSR2);
     80 	if (sigprocmask(SIG_SETMASK, &u.libc_mask, NULL))
     81 		perror_msg_and_fail("sigprocmask");
     82 
     83 	const struct sigaction sa = { .sa_handler = handler };
     84 	if (sigaction(SIGUSR1, &sa, NULL) || sigaction(SIGUSR2, &sa, NULL))
     85 		perror_msg_and_fail("sigaction");
     86 
     87 	raise(SIGUSR1);
     88 	raise(SIGUSR2);
     89 
     90 	u.old_mask = -1UL;
     91 	sigdelset(&u.libc_mask, SIGUSR1);
     92 	const unsigned long mask1 = u.old_mask;
     93 
     94 	u.old_mask = -1UL;
     95 	sigdelset(&u.libc_mask, SIGUSR2);
     96 	const unsigned long mask2 = u.old_mask;
     97 
     98 #if SIGNAL_MASK_BY_REF
     99 	k_sigsuspend((uintptr_t) &mask1, 0xdeadbeef, (uintptr_t) &mask2);
    100 #else
    101 	k_sigsuspend(mask1, 0xdeadbeef, mask2);
    102 #endif
    103 	if (EINTR != errno)
    104 		perror_msg_and_skip("sigsuspend");
    105 
    106 	printf("sigsuspend(~[%s]) = ? ERESTARTNOHAND"
    107 	       " (To be restarted if no handler)\n", sigtxt[signo]);
    108 
    109 	puts("+++ exited with 0 +++");
    110 	return 0;
    111 }
    112 
    113 #else
    114 
    115 SKIP_MAIN_UNDEFINED("__NR_sigsuspend")
    116 
    117 #endif
    118