1  /*
       2   * Check decoding of getrandom syscall.
       3   *
       4   * Copyright (c) 2015-2018 Dmitry V. Levin <ldv@strace.io>
       5   * Copyright (c) 2015-2021 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 "scno.h"
      13  
      14  #include <stdio.h>
      15  #include <unistd.h>
      16  
      17  int
      18  main(void)
      19  {
      20  	unsigned char buf[4];
      21  
      22  	/*
      23  	 * syscall/printf are in the inverted order to trigger tcache
      24  	 * initialisation first see glibc-2.33.9000-879-gfc859c3.
      25  	 */
      26  	printf("getrandom(NULL, 0, 0) = 0\n");
      27  	if (syscall(__NR_getrandom, 0, 0, 0) != 0)
      28  		perror_msg_and_skip("getrandom(NULL, 0, 0)");
      29  
      30  	if (syscall(__NR_getrandom, buf, sizeof(buf) - 1, 0) != sizeof(buf) - 1)
      31  		perror_msg_and_skip("getrandom");
      32  	printf("getrandom(\"\\x%02x\\x%02x\\x%02x\", 3, 0) = 3\n",
      33  	       (int) buf[0], (int) buf[1], (int) buf[2]);
      34  
      35  	if (syscall(__NR_getrandom, buf, sizeof(buf), 1) != sizeof(buf))
      36  		perror_msg_and_skip("getrandom");
      37  	printf("getrandom(\"\\x%02x\\x%02x\\x%02x\"..., 4, GRND_NONBLOCK) = 4\n",
      38  	       (int) buf[0], (int) buf[1], (int) buf[2]);
      39  
      40  	if (syscall(__NR_getrandom, buf, sizeof(buf), 0x3003) != -1)
      41  		perror_msg_and_skip("getrandom");
      42  	printf("getrandom(%p, 4, GRND_NONBLOCK|GRND_RANDOM|0x3000) = "
      43  	       "-1 EINVAL (%m)\n", buf);
      44  
      45  	puts("+++ exited with 0 +++");
      46  	return 0;
      47  }