Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef __PIDFD_H
4#define __PIDFD_H
5
6#define _GNU_SOURCE
7#include <errno.h>
8#include <fcntl.h>
9#include <sched.h>
10#include <signal.h>
11#include <stdio.h>
12#include <stdlib.h>
13#include <string.h>
14#include <syscall.h>
15#include <sys/mount.h>
16#include <sys/types.h>
17#include <sys/wait.h>
18
19#include "../kselftest.h"
20
21#ifndef P_PIDFD
22#define P_PIDFD 3
23#endif
24
25#ifndef CLONE_NEWTIME
26#define CLONE_NEWTIME 0x00000080
27#endif
28
29#ifndef CLONE_PIDFD
30#define CLONE_PIDFD 0x00001000
31#endif
32
33#ifndef __NR_pidfd_open
34#define __NR_pidfd_open -1
35#endif
36
37#ifndef __NR_pidfd_send_signal
38#define __NR_pidfd_send_signal -1
39#endif
40
41#ifndef __NR_clone3
42#define __NR_clone3 -1
43#endif
44
45#ifndef __NR_pidfd_getfd
46#define __NR_pidfd_getfd -1
47#endif
48
49/*
50 * The kernel reserves 300 pids via RESERVED_PIDS in kernel/pid.c
51 * That means, when it wraps around any pid < 300 will be skipped.
52 * So we need to use a pid > 300 in order to test recycling.
53 */
54#define PID_RECYCLE 1000
55
56/*
57 * Define a few custom error codes for the child process to clearly indicate
58 * what is happening. This way we can tell the difference between a system
59 * error, a test error, etc.
60 */
61#define PIDFD_PASS 0
62#define PIDFD_FAIL 1
63#define PIDFD_ERROR 2
64#define PIDFD_SKIP 3
65#define PIDFD_XFAIL 4
66
67int wait_for_pid(pid_t pid)
68{
69 int status, ret;
70
71again:
72 ret = waitpid(pid, &status, 0);
73 if (ret == -1) {
74 if (errno == EINTR)
75 goto again;
76
77 return -1;
78 }
79
80 if (!WIFEXITED(status))
81 return -1;
82
83 return WEXITSTATUS(status);
84}
85
86static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
87{
88 return syscall(__NR_pidfd_open, pid, flags);
89}
90
91static inline int sys_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
92 unsigned int flags)
93{
94 return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
95}
96
97static inline int sys_pidfd_getfd(int pidfd, int fd, int flags)
98{
99 return syscall(__NR_pidfd_getfd, pidfd, fd, flags);
100}
101
102static inline int sys_memfd_create(const char *name, unsigned int flags)
103{
104 return syscall(__NR_memfd_create, name, flags);
105}
106
107#endif /* __PIDFD_H */