1 | /* Implementation of waitid. Hurd version. |
2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <sys/types.h> |
21 | #include <sys/wait.h> |
22 | #include <stddef.h> |
23 | #include <hurd.h> |
24 | #include <hurd/port.h> |
25 | #include <hurd/version.h> |
26 | #include <sysdep-cancel.h> |
27 | |
28 | int |
29 | __waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options) |
30 | { |
31 | struct rusage ignored; |
32 | error_t err; |
33 | pid_t pid, child; |
34 | int sigcode; |
35 | int status; |
36 | int cancel_oldtype; |
37 | |
38 | switch (idtype) |
39 | { |
40 | case P_PID: |
41 | if (id <= 0) |
42 | goto invalid; |
43 | pid = (pid_t) id; |
44 | break; |
45 | case P_PGID: |
46 | if (id < 0 || id == 1) |
47 | goto invalid; |
48 | pid = (pid_t) -id; |
49 | break; |
50 | case P_ALL: |
51 | pid = -1; |
52 | break; |
53 | default: |
54 | invalid: |
55 | return __hurd_fail (EINVAL); |
56 | } |
57 | |
58 | /* Technically we're supposed to return EFAULT if infop is bogus, |
59 | but that would involve mucking with signals, which is |
60 | too much hassle. User will have to deal with SIGSEGV/SIGBUS. |
61 | We just check for a null pointer. */ |
62 | |
63 | if (infop == NULL) |
64 | return __hurd_fail (EFAULT); |
65 | |
66 | cancel_oldtype = LIBC_CANCEL_ASYNC(); |
67 | #if HURD_INTERFACE_VERSION >= 20201227 |
68 | err = __USEPORT_CANCEL (PROC, __proc_waitid (port, pid, options, |
69 | &status, &sigcode, |
70 | &ignored, &child)); |
71 | if (err == MIG_BAD_ID || err == EOPNOTSUPP) |
72 | #endif |
73 | err = __USEPORT_CANCEL (PROC, __proc_wait (port, pid, options, |
74 | &status, &sigcode, |
75 | &ignored, &child)); |
76 | LIBC_CANCEL_RESET (cancel_oldtype); |
77 | |
78 | if (err == EAGAIN) |
79 | { |
80 | /* POSIX.1-2008, Technical Corrigendum 1 XSH/TC1-2008/0713 [153] states |
81 | that if waitid returns because WNOHANG was specified and status is |
82 | not available for any process specified by idtype and id, then the |
83 | si_signo and si_pid members of the structure pointed to by infop |
84 | shall be set to zero. */ |
85 | infop->si_signo = 0; |
86 | infop->si_code = 0; |
87 | return 0; |
88 | } |
89 | |
90 | if (err != 0) |
91 | return __hurd_fail (err); |
92 | |
93 | /* Decode the status field and set infop members... */ |
94 | infop->si_signo = SIGCHLD; |
95 | infop->si_pid = child; |
96 | infop->si_errno = 0; |
97 | |
98 | if (WIFEXITED (status)) |
99 | { |
100 | infop->si_code = CLD_EXITED; |
101 | infop->si_status = WEXITSTATUS (status); |
102 | } |
103 | else if (WIFSIGNALED (status)) |
104 | { |
105 | infop->si_code = WCOREDUMP (status) ? CLD_DUMPED : CLD_KILLED; |
106 | infop->si_status = WTERMSIG (status); |
107 | } |
108 | else if (WIFSTOPPED (status)) |
109 | { |
110 | infop->si_code = CLD_STOPPED; |
111 | infop->si_status = WSTOPSIG (status); |
112 | } |
113 | else if (WIFCONTINUED (status)) |
114 | { |
115 | infop->si_code = CLD_CONTINUED; |
116 | infop->si_status = SIGCONT; |
117 | } |
118 | |
119 | return 0; |
120 | } |
121 | weak_alias (__waitid, waitid) |
122 | strong_alias (__waitid, __libc_waitid) |
123 | |