1 /* SPDX-License-Identifier: GPL-2.0 */
15 #include <sys/mount.h>
17 #include "../kselftest.h"
24 #define CLONE_PIDFD 0x00001000
27 #ifndef __NR_pidfd_open
28 #define __NR_pidfd_open -1
31 #ifndef __NR_pidfd_send_signal
32 #define __NR_pidfd_send_signal -1
36 #define __NR_clone3 -1
40 * The kernel reserves 300 pids via RESERVED_PIDS in kernel/pid.c
41 * That means, when it wraps around any pid < 300 will be skipped.
42 * So we need to use a pid > 300 in order to test recycling.
44 #define PID_RECYCLE 1000
47 * Define a few custom error codes for the child process to clearly indicate
48 * what is happening. This way we can tell the difference between a system
49 * error, a test error, etc.
57 int wait_for_pid(pid_t pid)
62 ret = waitpid(pid, &status, 0);
70 if (!WIFEXITED(status))
73 return WEXITSTATUS(status);
76 static inline int sys_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
79 return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
82 #endif /* __PIDFD_H */