1  /*
       2   * Copyright (c) 2016-2021 The strace developers.
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: LGPL-2.1-or-later
       6   */
       7  
       8  #ifndef PTRACE_SET_SYSCALL
       9  # define PTRACE_SET_SYSCALL 23
      10  #endif
      11  /*
      12   * PTRACE_SET_SYSCALL is supported by linux kernel
      13   * starting with commit v2.6.16-rc1~107^2
      14   */
      15  
      16  static int
      17  arch_set_scno(struct tcb *tcp, kernel_ulong_t scno)
      18  {
      19  	unsigned int n = (uint16_t) scno;
      20  	int rc = ptrace(PTRACE_SET_SYSCALL, tcp->pid, NULL, (unsigned long) n);
      21  	if (rc && errno != ESRCH)
      22  		perror_msg("arch_set_scno: PTRACE_SET_SYSCALL pid:%d scno:%#x",
      23  			   tcp->pid, n);
      24  	return rc;
      25  }