1  /*
       2   * Check decoding of epoll_pwait2 syscall.
       3   *
       4   * Copyright (c) 2015-2021 Dmitry V. Levin <ldv@strace.io>
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: GPL-2.0-or-later
       8   */
       9  
      10  #include "tests.h"
      11  #include "scno.h"
      12  #include "xmalloc.h"
      13  #include <fcntl.h>
      14  #include <stdio.h>
      15  #include <stdlib.h>
      16  #include <unistd.h>
      17  #include <sys/epoll.h>
      18  #include "kernel_timespec.h"
      19  
      20  #ifndef DECODE_FDS
      21  # define DECODE_FDS 0
      22  #endif
      23  #ifndef SKIP_IF_PROC_IS_UNAVAILABLE
      24  # define SKIP_IF_PROC_IS_UNAVAILABLE
      25  #endif
      26  
      27  static const char *errstr;
      28  
      29  static long
      30  k_epoll_pwait2(const unsigned int epfd,
      31  	       const void *const events,
      32  	       const unsigned int maxevents,
      33  	       const void *const timeout,
      34  	       const void *const sigmask,
      35  	       const kernel_ulong_t sigsetsize)
      36  {
      37  	const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
      38  	const kernel_ulong_t arg1 = fill | epfd;
      39  	const kernel_ulong_t arg2 = (unsigned long) events;
      40  	const kernel_ulong_t arg3 = fill | maxevents;
      41  	const kernel_ulong_t arg4 = (unsigned long) timeout;
      42  	const kernel_ulong_t arg5 = (unsigned long) sigmask;
      43  	const kernel_ulong_t arg6 = sigsetsize;
      44  	const long rc = syscall(__NR_epoll_pwait2,
      45  				arg1, arg2, arg3, arg4, arg5, arg6);
      46  	errstr = sprintrc(rc);
      47  	return rc;
      48  }
      49  
      50  int
      51  main(void)
      52  {
      53  	SKIP_IF_PROC_IS_UNAVAILABLE;
      54  
      55  	static const char fd_path[] = "/dev/full";
      56  	int fd = open(fd_path, O_WRONLY);
      57  	if (fd < 0)
      58  		perror_msg_and_fail("open: %s", fd_path);
      59  	char *fd_str = xasprintf("%d%s%s%s", fd,
      60  				 DECODE_FDS ? "<" : "",
      61  				 DECODE_FDS ? fd_path : "",
      62  				 DECODE_FDS ? ">" : "");
      63  
      64  	TAIL_ALLOC_OBJECT_CONST_PTR(struct epoll_event, events);
      65  	TAIL_ALLOC_OBJECT_CONST_PTR(kernel_timespec64_t, timeout);
      66  	TAIL_ALLOC_OBJECT_CONST_PTR(kernel_ulong_t, sigmask);
      67  	const unsigned int sigsetsize = sizeof(*sigmask);
      68  
      69  	k_epoll_pwait2(-1, events, fd, timeout, sigmask, fd);
      70  #ifndef PATH_TRACING
      71  	printf("epoll_pwait2(-1, %p, %d, %p, %p, %u) = %s\n",
      72  	       events, fd, timeout, sigmask, fd, errstr);
      73  #endif
      74  
      75  	k_epoll_pwait2(fd, events, -1, timeout, sigmask, sigsetsize);
      76  	printf("epoll_pwait2(%s, %p, -1, %p, %p, %u) = %s\n",
      77  	       fd_str, events, timeout, sigmask, sigsetsize, errstr);
      78  
      79  	/*
      80  	 * Some positive tests should be added here
      81  	 * when epoll_pwait2 becomes widely available.
      82  	 */
      83  
      84  	puts("+++ exited with 0 +++");
      85  	return 0;
      86  }