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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <Kernel/Syscall.h>
28#include <assert.h>
29#include <sys/wait.h>
30#include <unistd.h>
31
32extern "C" {
33
34pid_t wait(int* wstatus)
35{
36 return waitpid(-1, wstatus, 0);
37}
38
39pid_t waitpid(pid_t waitee, int* wstatus, int options)
40{
41 siginfo_t siginfo;
42 idtype_t idtype;
43 id_t id;
44
45 if (waitee < -1) {
46 idtype = P_PGID;
47 id = -waitee;
48 } else if (waitee == -1) {
49 idtype = P_ALL;
50 id = 0;
51 } else if (waitee == 0) {
52 idtype = P_PGID;
53 id = getgid();
54 } else {
55 idtype = P_PID;
56 id = waitee;
57 }
58
59 int rc = waitid(idtype, id, &siginfo, options | WEXITED);
60
61 if (rc < 0)
62 return rc;
63
64 if (wstatus) {
65 switch (siginfo.si_code) {
66 case CLD_EXITED:
67 *wstatus = siginfo.si_status << 8;
68 break;
69 case CLD_KILLED:
70 *wstatus = siginfo.si_status;
71 break;
72 case CLD_STOPPED:
73 *wstatus = siginfo.si_status << 8 | 0x7f;
74 break;
75 default:
76 ASSERT_NOT_REACHED();
77 }
78 }
79
80 return siginfo.si_pid;
81}
82
83int waitid(idtype_t idtype, id_t id, siginfo_t* infop, int options)
84{
85 Syscall::SC_waitid_params params { idtype, id, infop, options };
86 int rc = syscall(SC_waitid, ¶ms);
87 __RETURN_WITH_ERRNO(rc, rc, -1);
88}
89}