tools/testing/selftests/clone3/clone3_selftests.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 #ifndef _CLONE3_SELFTESTS_H
   4 #define _CLONE3_SELFTESTS_H
   5
   6 #define _GNU_SOURCE
   7 #include <sched.h>
   8 #include <linux/sched.h>
   9 #include <linux/types.h>
  10 #include <stdint.h>
  11 #include <syscall.h>
  12 #include <sys/wait.h>
  13
  14 #include "../kselftest.h"
  15
  16 #define ptr_to_u64(ptr) ((__u64)((uintptr_t)(ptr)))
  17
  18 #ifndef __NR_clone3
  19 #define __NR_clone3 -1
  20 #endif
  21
  22 struct __clone_args {
  23         __aligned_u64 flags;
  24         __aligned_u64 pidfd;
  25         __aligned_u64 child_tid;
  26         __aligned_u64 parent_tid;
  27         __aligned_u64 exit_signal;
  28         __aligned_u64 stack;
  29         __aligned_u64 stack_size;
  30         __aligned_u64 tls;
  31         __aligned_u64 set_tid;
  32         __aligned_u64 set_tid_size;
  33         __aligned_u64 cgroup;
  34 };
  35
  36 static pid_t sys_clone3(struct __clone_args *args, size_t size)
  37 {
  38         fflush(stdout);
  39         fflush(stderr);
  40         return syscall(__NR_clone3, args, size);
  41 }
  42
  43 static inline void test_clone3_supported(void)
  44 {
  45         pid_t pid;
  46         struct __clone_args args = {};
  47
  48         if (__NR_clone3 < 0)
  49                 ksft_exit_skip("clone3() syscall is not supported\n");
  50
  51         /* Set to something that will always cause EINVAL. */
  52         args.exit_signal = -1;
  53         pid = sys_clone3(&args, sizeof(args));
  54         if (!pid)
  55                 exit(EXIT_SUCCESS);
  56
  57         if (pid > 0) {
  58                 wait(NULL);
  59                 ksft_exit_fail_msg(
  60                         "Managed to create child process with invalid exit_signal\n");
  61         }
  62
  63         if (errno == ENOSYS)
  64                 ksft_exit_skip("clone3() syscall is not supported\n");
  65
  66         ksft_print_msg("clone3() syscall supported\n");
  67 }
  68
  69 #endif /* _CLONE3_SELFTESTS_H */