1  /*
       2   * Check decoding of sched_getparam and sched_setparam syscalls.
       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  #include "pidns.h"
      13  
      14  #include <sched.h>
      15  #include <stdio.h>
      16  #include <unistd.h>
      17  
      18  int
      19  main(void)
      20  {
      21  	PIDNS_TEST_INIT;
      22  
      23  	struct sched_param *const param =
      24  		tail_alloc(sizeof(struct sched_param));
      25  
      26  	const int pid = getpid();
      27  	const char *pid_str = pidns_pid2str(PT_TGID);
      28  
      29  	long rc = syscall(__NR_sched_getparam, pid, param);
      30  	pidns_print_leader();
      31  	printf("sched_getparam(%d%s, [%d]) = %ld\n",
      32  	       pid, pid_str, param->sched_priority, rc);
      33  
      34  	param->sched_priority = -1;
      35  	rc = syscall(__NR_sched_setparam, pid, param);
      36  	pidns_print_leader();
      37  	printf("sched_setparam(%d%s, [%d]) = %ld %s (%m)\n",
      38  	       pid, pid_str,
      39  	       param->sched_priority, rc, errno2name());
      40  
      41  	pidns_print_leader();
      42  	puts("+++ exited with 0 +++");
      43  	return 0;
      44  }