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
24 static __attribute__((unused))
sys_wait4(pid_t pid,int * status,int options,struct rusage * rusage)25 pid_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
34 static __attribute__((unused))
wait4(pid_t pid,int * status,int options,struct rusage * rusage)35 pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage)
36 {
37 return __sysret(sys_wait4(pid, status, options, rusage));
38 }
39
40 static __attribute__((unused))
sys_waitid(int which,pid_t pid,siginfo_t * infop,int options,struct rusage * rusage)41 int 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
46 static __attribute__((unused))
waitid(int which,pid_t pid,siginfo_t * infop,int options)47 int 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
53 static __attribute__((unused))
waitpid(pid_t pid,int * status,int options)54 pid_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
110 static __attribute__((unused))
wait(int * status)111 pid_t wait(int *status)
112 {
113 return waitpid(-1, status, 0);
114 }
115
116 #endif /* _NOLIBC_SYS_WAIT_H */
117