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 #ifndef PIDFD_SELF_THREAD
54 #define PIDFD_SELF_THREAD -10000 /* Current thread. */
55 #endif
56
57 #ifndef PIDFD_SELF_THREAD_GROUP
58 #define PIDFD_SELF_THREAD_GROUP -20000 /* Current thread group leader. */
59 #endif
60
61 #ifndef PIDFD_SELF
62 #define PIDFD_SELF PIDFD_SELF_THREAD
63 #endif
64
65 #ifndef PIDFD_SELF_PROCESS
66 #define PIDFD_SELF_PROCESS PIDFD_SELF_THREAD_GROUP
67 #endif
68
69 /*
70 * The kernel reserves 300 pids via RESERVED_PIDS in kernel/pid.c
71 * That means, when it wraps around any pid < 300 will be skipped.
72 * So we need to use a pid > 300 in order to test recycling.
73 */
74 #define PID_RECYCLE 1000
75
76 /*
77 * Define a few custom error codes for the child process to clearly indicate
78 * what is happening. This way we can tell the difference between a system
79 * error, a test error, etc.
80 */
81 #define PIDFD_PASS 0
82 #define PIDFD_FAIL 1
83 #define PIDFD_ERROR 2
84 #define PIDFD_SKIP 3
85 #define PIDFD_XFAIL 4
86
wait_for_pid(pid_t pid)87 static inline int wait_for_pid(pid_t pid)
88 {
89 int status, ret;
90
91 again:
92 ret = waitpid(pid, &status, 0);
93 if (ret == -1) {
94 if (errno == EINTR)
95 goto again;
96
97 ksft_print_msg("waitpid returned -1, errno=%d\n", errno);
98 return -1;
99 }
100
101 if (!WIFEXITED(status)) {
102 ksft_print_msg(
103 "waitpid !WIFEXITED, WIFSIGNALED=%d, WTERMSIG=%d\n",
104 WIFSIGNALED(status), WTERMSIG(status));
105 return -1;
106 }
107
108 ret = WEXITSTATUS(status);
109 return ret;
110 }
111
sys_pidfd_open(pid_t pid,unsigned int flags)112 static inline int sys_pidfd_open(pid_t pid, unsigned int flags)
113 {
114 return syscall(__NR_pidfd_open, pid, flags);
115 }
116
sys_pidfd_send_signal(int pidfd,int sig,siginfo_t * info,unsigned int flags)117 static inline int sys_pidfd_send_signal(int pidfd, int sig, siginfo_t *info,
118 unsigned int flags)
119 {
120 return syscall(__NR_pidfd_send_signal, pidfd, sig, info, flags);
121 }
122
sys_pidfd_getfd(int pidfd,int fd,int flags)123 static inline int sys_pidfd_getfd(int pidfd, int fd, int flags)
124 {
125 return syscall(__NR_pidfd_getfd, pidfd, fd, flags);
126 }
127
sys_memfd_create(const char * name,unsigned int flags)128 static inline int sys_memfd_create(const char *name, unsigned int flags)
129 {
130 return syscall(__NR_memfd_create, name, flags);
131 }
132
133 #endif /* __PIDFD_H */
134