Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
2/*
3 * wait definitions for NOLIBC
4 * Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
5 */
6
7/* make sure to include all global symbols */
8#include "../nolibc.h"
9
10#ifndef _NOLIBC_SYS_WAIT_H
11#define _NOLIBC_SYS_WAIT_H
12
13#include "../arch.h"
14#include "../std.h"
15#include "../types.h"
16
17/*
18 * pid_t wait(int *status);
19 * pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage);
20 * pid_t waitpid(pid_t pid, int *status, int options);
21 * int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options);
22 */
23
24static __attribute__((unused))
25pid_t sys_wait4(pid_t pid, int *status, int options, struct rusage *rusage)
26{
27#ifdef __NR_wait4
28 return my_syscall4(__NR_wait4, pid, status, options, rusage);
29#else
30 return __nolibc_enosys(__func__, pid, status, options, rusage);
31#endif
32}
33
34static __attribute__((unused))
35pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage)
36{
37 return __sysret(sys_wait4(pid, status, options, rusage));
38}
39
40static __attribute__((unused))
41int sys_waitid(int which, pid_t pid, siginfo_t *infop, int options, struct rusage *rusage)
42{
43 return my_syscall5(__NR_waitid, which, pid, infop, options, rusage);
44}
45
46static __attribute__((unused))
47int waitid(int which, pid_t pid, siginfo_t *infop, int options)
48{
49 return __sysret(sys_waitid(which, pid, infop, options, NULL));
50}
51
52
53static __attribute__((unused))
54pid_t waitpid(pid_t pid, int *status, int options)
55{
56 int idtype, ret;
57 siginfo_t info;
58 pid_t id;
59
60 if (pid == INT_MIN) {
61 SET_ERRNO(ESRCH);
62 return -1;
63 } else if (pid < -1) {
64 idtype = P_PGID;
65 id = -pid;
66 } else if (pid == -1) {
67 idtype = P_ALL;
68 id = 0;
69 } else if (pid == 0) {
70 idtype = P_PGID;
71 id = 0;
72 } else {
73 idtype = P_PID;
74 id = pid;
75 }
76
77 options |= WEXITED;
78
79 ret = waitid(idtype, id, &info, options);
80 if (ret)
81 return ret;
82
83 switch (info.si_code) {
84 case 0:
85 *status = 0;
86 break;
87 case CLD_EXITED:
88 *status = (info.si_status & 0xff) << 8;
89 break;
90 case CLD_KILLED:
91 *status = info.si_status & 0x7f;
92 break;
93 case CLD_DUMPED:
94 *status = (info.si_status & 0x7f) | 0x80;
95 break;
96 case CLD_STOPPED:
97 case CLD_TRAPPED:
98 *status = (info.si_status << 8) + 0x7f;
99 break;
100 case CLD_CONTINUED:
101 *status = 0xffff;
102 break;
103 default:
104 return -1;
105 }
106
107 return info.si_pid;
108}
109
110static __attribute__((unused))
111pid_t wait(int *status)
112{
113 return waitpid(-1, status, 0);
114}
115
116#endif /* _NOLIBC_SYS_WAIT_H */