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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __PIDFD_H
#define __PIDFD_H
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syscall.h>
#include <sys/mount.h>
#include "../kselftest.h"
#ifndef P_PIDFD
#define P_PIDFD 3
#endif
#ifndef CLONE_PIDFD
#define CLONE_PIDFD 0x00001000
#endif
#ifndef __NR_pidfd_open
#define __NR_pidfd_open -1
#endif
#ifndef __NR_pidfd_send_signal
#define __NR_pidfd_send_signal -1
#endif
#ifndef __NR_clone3
#define __NR_clone3 -1
#endif
/*
* The kernel reserves 300 pids via RESERVED_PIDS in kernel/pid.c
* That means, when it wraps around any pid < 300 will be skipped.
* So we need to use a pid > 300 in order to test recycling.
*/
#define PID_RECYCLE 1000
/*
* Define a few custom error codes for the child process to clearly indicate
* what is happening. This way we can tell the difference between a system
* error, a test error, etc.
*/
#define PIDFD_PASS 0
#define PIDFD_FAIL 1
#define PIDFD_ERROR 2
#define PIDFD_SKIP 3
#define PIDFD_XFAIL 4
int wait_for_pid(pid_t pid)
{
int status, ret;
again:
ret = waitpid(pid, &status, 0);
if (ret == -1) {
if (errno == EINTR)
goto again;
return -1;
}
if (!WIFEXITED(status))
return -1;
return WEXITSTATUS(status);
}
static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
{
return syscall(__NR_pidfd_open, pid, flags);
}
static inline int sys_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
unsigned int flags)
{
return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
}
#endif /* __PIDFD_H */
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