1  /*
       2   * Copyright (c) 2015-2018 Dmitry V. Levin <ldv@strace.io>
       3   * Copyright (c) 2015-2021 The strace developers.
       4   * All rights reserved.
       5   *
       6   * SPDX-License-Identifier: GPL-2.0-or-later
       7   */
       8  
       9  #include "tests.h"
      10  #include "scno.h"
      11  
      12  #if defined __powerpc64__ \
      13   || (defined __sparc__ && defined __arch64__)
      14  /* Old sigreturn is defined but not implemented in the kernel. */
      15  # undef __NR_sigreturn
      16  #endif
      17  
      18  #ifdef __NR_sigreturn
      19  
      20  # include <signal.h>
      21  # include <stdio.h>
      22  # include <stdlib.h>
      23  
      24  # ifdef ASM_SIGRTMIN
      25  #  define RT_0 ASM_SIGRTMIN
      26  # else
      27  /* Linux kernel >= 3.18 defines SIGRTMIN to 32 on all architectures. */
      28  #  define RT_0 32
      29  # endif
      30  
      31  static void
      32  handler(int sig)
      33  {
      34  }
      35  
      36  int
      37  main(void)
      38  {
      39  	static sigset_t set;
      40  	sigemptyset(&set);
      41  	sigaddset(&set, SIGINT);
      42  	sigaddset(&set, SIGUSR2);
      43  	sigaddset(&set, SIGCHLD);
      44  	sigaddset(&set, RT_0 +  3);
      45  	sigaddset(&set, RT_0 +  4);
      46  	sigaddset(&set, RT_0 +  5);
      47  	sigaddset(&set, RT_0 + 26);
      48  	sigaddset(&set, RT_0 + 27);
      49  	if (sigprocmask(SIG_SETMASK, &set, NULL))
      50  		perror_msg_and_fail("sigprocmask");
      51  	sigemptyset(&set);
      52  
      53  	/* This should result to old sigreturn. */
      54  	if (signal(SIGUSR1, handler) == SIG_ERR)
      55  		perror_msg_and_fail("sigaction");
      56  
      57  	if (raise(SIGUSR1))
      58  		perror_msg_and_fail("raise");
      59  
      60  	static const char *const sigs =
      61  		(SIGUSR2 < SIGCHLD) ? "INT USR2 CHLD" : "INT CHLD USR2";
      62  	static const char *const rt_sigs = "RT_3 RT_4 RT_5 RT_26 RT_27";
      63  	printf("sigreturn({mask=[%s %s]}) = 0\n", sigs, rt_sigs);
      64  
      65  	puts("+++ exited with 0 +++");
      66  	return 0;
      67  }
      68  
      69  #else
      70  
      71  SKIP_MAIN_UNDEFINED("__NR_sigreturn")
      72  
      73  #endif