Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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 waitpid(pid_t pid, int *status, int options);
20 * int waitid(idtype_t idtype, id_t id, siginfo_t *infop, int options);
21 */
22
23static __attribute__((unused))
24int sys_waitid(int which, pid_t pid, siginfo_t *infop, int options, struct rusage *rusage)
25{
26 return my_syscall5(__NR_waitid, which, pid, infop, options, rusage);
27}
28
29static __attribute__((unused))
30int waitid(int which, pid_t pid, siginfo_t *infop, int options)
31{
32 return __sysret(sys_waitid(which, pid, infop, options, NULL));
33}
34
35
36static __attribute__((unused))
37pid_t waitpid(pid_t pid, int *status, int options)
38{
39 int idtype, ret;
40 siginfo_t info;
41 pid_t id;
42
43 if (pid == INT_MIN) {
44 SET_ERRNO(ESRCH);
45 return -1;
46 } else if (pid < -1) {
47 idtype = P_PGID;
48 id = -pid;
49 } else if (pid == -1) {
50 idtype = P_ALL;
51 id = 0;
52 } else if (pid == 0) {
53 idtype = P_PGID;
54 id = 0;
55 } else {
56 idtype = P_PID;
57 id = pid;
58 }
59
60 options |= WEXITED;
61
62 ret = waitid(idtype, id, &info, options);
63 if (ret)
64 return -1;
65
66 switch (info.si_code) {
67 case 0:
68 *status = 0;
69 break;
70 case CLD_EXITED:
71 *status = (info.si_status & 0xff) << 8;
72 break;
73 case CLD_KILLED:
74 *status = info.si_status & 0x7f;
75 break;
76 case CLD_DUMPED:
77 *status = (info.si_status & 0x7f) | 0x80;
78 break;
79 case CLD_STOPPED:
80 case CLD_TRAPPED:
81 *status = (info.si_status << 8) + 0x7f;
82 break;
83 case CLD_CONTINUED:
84 *status = 0xffff;
85 break;
86 default:
87 return -1;
88 }
89
90 return info.si_pid;
91}
92
93static __attribute__((unused))
94pid_t wait(int *status)
95{
96 return waitpid(-1, status, 0);
97}
98
99#endif /* _NOLIBC_SYS_WAIT_H */