1  /*
       2   * Check decoding of epoll_ctl syscall.
       3   *
       4   * Copyright (c) 2016-2021 The strace developers.
       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  
      13  #include <inttypes.h>
      14  #include <stdio.h>
      15  #include <sys/epoll.h>
      16  #include <unistd.h>
      17  
      18  static long
      19  invoke_syscall(unsigned long epfd, unsigned long op, unsigned long fd, void *ev)
      20  {
      21  	return syscall(__NR_epoll_ctl, epfd, F8ILL_KULONG_MASK | op,
      22  		       fd, (unsigned long) ev);
      23  }
      24  
      25  int
      26  main(void)
      27  {
      28  	TAIL_ALLOC_OBJECT_CONST_PTR(struct epoll_event, ev);
      29  	ev->events = EPOLLIN;
      30  
      31  	long rc = invoke_syscall(-1U, EPOLL_CTL_ADD, -2U, ev);
      32  	printf("epoll_ctl(-1, EPOLL_CTL_ADD, -2"
      33  	       ", {events=EPOLLIN, data={u32=%u, u64=%" PRIu64 "}}) = %s\n",
      34  	       ev->data.u32, ev->data.u64, sprintrc(rc));
      35  
      36  	rc = invoke_syscall(-3U, EPOLL_CTL_DEL, -4U, ev);
      37  	printf("epoll_ctl(-3, EPOLL_CTL_DEL, -4, %p) = %s\n",
      38  	       ev, sprintrc(rc));
      39  
      40  	rc = invoke_syscall(-1UL, EPOLL_CTL_MOD, -16UL, 0);
      41  	printf("epoll_ctl(-1, EPOLL_CTL_MOD, -16, NULL) = %s\n",
      42  	       sprintrc(rc));
      43  
      44  	puts("+++ exited with 0 +++");
      45  	return 0;
      46  }