1  /*
       2   * Invoke a socket syscall, either directly or via __NR_socketcall.
       3   *
       4   * Copyright (c) 2016-2018 Dmitry V. Levin <ldv@strace.io>
       5   * Copyright (c) 2016-2021 The strace developers.
       6   * All rights reserved.
       7   *
       8   * SPDX-License-Identifier: GPL-2.0-or-later
       9   */
      10  
      11  #include "tests.h"
      12  #include <errno.h>
      13  #include <unistd.h>
      14  #include "scno.h"
      15  
      16  /*
      17   * Invoke a socket syscall, either directly or via __NR_socketcall.
      18   * if nr == -1, no direct syscall invocation will be made.
      19   */
      20  int
      21  socketcall(const int nr, const int call,
      22  	   long a1, long a2, long a3, long a4, long a5)
      23  {
      24  	int rc = -1;
      25  	errno = ENOSYS;
      26  
      27  #ifdef __NR_socketcall
      28  	static int have_socketcall = -1;
      29  
      30  	if (have_socketcall < 0) {
      31  		if (syscall(__NR_socketcall, 0L, 0L, 0L, 0L, 0L) < 0
      32  		    && EINVAL == errno) {
      33  			have_socketcall = 1;
      34  		} else {
      35  			have_socketcall = 0;
      36  		}
      37  	}
      38  
      39  	if (have_socketcall) {
      40  		const long args[] = { a1, a2, a3, a4, a5 };
      41  		rc = syscall(__NR_socketcall, call, args);
      42  	} else
      43  #endif
      44  	{
      45  		if (nr != -1)
      46  			rc = syscall(nr, a1, a2, a3, a4, a5);
      47  	}
      48  
      49  	return rc;
      50  }