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 #ifndef PIDFD_NONBLOCK
50 #define PIDFD_NONBLOCK O_NONBLOCK
51 #endif
52
53 /*
54 * The kernel reserves 300 pids via RESERVED_PIDS in kernel/pid.c
55 * That means, when it wraps around any pid < 300 will be skipped.
56 * So we need to use a pid > 300 in order to test recycling.
57 */
58 #define PID_RECYCLE 1000
59
60 /*
61 * Define a few custom error codes for the child process to clearly indicate
62 * what is happening. This way we can tell the difference between a system
63 * error, a test error, etc.
64 */
65 #define PIDFD_PASS 0
66 #define PIDFD_FAIL 1
67 #define PIDFD_ERROR 2
68 #define PIDFD_SKIP 3
69 #define PIDFD_XFAIL 4
70
71 static inline int wait_for_pid(pid_t pid)
72 {
73 int status, ret;
74
75 again:
76 ret = waitpid(pid, &status, 0);
77 if (ret == -1) {
78 if (errno == EINTR)
79 goto again;
80
81 ksft_print_msg("waitpid returned -1, errno=%d\n", errno);
82 return -1;
83 }
84
85 if (!WIFEXITED(status)) {
86 ksft_print_msg(
87 "waitpid !WIFEXITED, WIFSIGNALED=%d, WTERMSIG=%d\n",
88 WIFSIGNALED(status), WTERMSIG(status));
89 return -1;
90 }
91
92 ret = WEXITSTATUS(status);
93 return ret;
94 }
95
96 static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
97 {
98 return syscall(__NR_pidfd_open, pid, flags);
99 }
100
101 static inline int sys_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
102 unsigned int flags)
103 {
104 return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
105 }
106
107 static inline int sys_pidfd_getfd(int pidfd, int fd, int flags)
108 {
109 return syscall(__NR_pidfd_getfd, pidfd, fd, flags);
110 }
111
112 static inline int sys_memfd_create(const char *name, unsigned int flags)
113 {
114 return syscall(__NR_memfd_create, name, flags);
115 }
116
117 #endif /* __PIDFD_H */
118
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.