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1/* Pseudo implementation of waitid.
2 Copyright (C) 1997-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1997.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
19
20#include <assert.h>
21#include <errno.h>
22#include <signal.h>
23#define __need_NULL
24#include <stddef.h>
25#include <sys/wait.h>
26#include <sys/types.h>
27#include <sysdep-cancel.h>
28
29
30#ifdef DO_WAITID
31# define OUR_WAITID DO_WAITID
32#elif !defined NO_DO_WAITID
33# define OUR_WAITID do_waitid
34#endif
35
36#ifdef OUR_WAITID
37static int
38OUR_WAITID (idtype_t idtype, id_t id, siginfo_t *infop, int options)
39{
40 pid_t pid, child;
41 int status;
42
43 switch (idtype)
44 {
45 case P_PID:
46 if(id <= 0)
47 goto invalid;
48 pid = (pid_t) id;
49 break;
50 case P_PGID:
51 if (id < 0 || id == 1)
52 goto invalid;
53 pid = (pid_t) -id;
54 break;
55 case P_ALL:
56 pid = -1;
57 break;
58 default:
59 invalid:
60 __set_errno (EINVAL);
61 return -1;
62 }
63
64 /* Technically we're supposed to return EFAULT if infop is bogus,
65 but that would involve mucking with signals, which is
66 too much hassle. User will have to deal with SIGSEGV/SIGBUS.
67 We just check for a null pointer. */
68
69 if (infop == NULL)
70 {
71 __set_errno (EFAULT);
72 return -1;
73 }
74
75 /* This emulation using waitpid cannot support the waitid modes in which
76 we do not reap the child, or match only stopped and not dead children. */
77 if (0
78#ifdef WNOWAIT
79 || (options & WNOWAIT)
80#endif
81#ifdef WEXITED
82 || ((options & (WEXITED|WSTOPPED|WCONTINUED))
83 != (WEXITED | (options & WSTOPPED)))
84#endif
85 )
86 {
87 __set_errno (ENOTSUP);
88 return -1;
89 }
90
91 /* Note the waitid() is a cancellation point. But since we call
92 waitpid() which itself is a cancellation point we do not have
93 to do anything here. */
94 child = __waitpid (pid, &status,
95 options
96#ifdef WEXITED
97 &~ WEXITED
98#endif
99 );
100
101 if (child == -1)
102 /* `waitpid' set `errno' for us. */
103 return -1;
104
105 if (child == 0)
106 {
107 /* The WHOHANG bit in OPTIONS is set and there are children available
108 but none has a status for us. The XPG docs do not mention this
109 case so we clear the `siginfo_t' struct and return successfully. */
110 infop->si_signo = 0;
111 infop->si_code = 0;
112 return 0;
113 }
114
115 /* Decode the status field and set infop members... */
116 infop->si_signo = SIGCHLD;
117 infop->si_pid = child;
118 infop->si_errno = 0;
119
120 if (WIFEXITED (status))
121 {
122 infop->si_code = CLD_EXITED;
123 infop->si_status = WEXITSTATUS (status);
124 }
125 else if (WIFSIGNALED (status))
126 {
127 infop->si_code = WCOREDUMP (status) ? CLD_DUMPED : CLD_KILLED;
128 infop->si_status = WTERMSIG (status);
129 }
130 else if (WIFSTOPPED (status))
131 {
132 infop->si_code = CLD_STOPPED;
133 infop->si_status = WSTOPSIG (status);
134 }
135#ifdef WIFCONTINUED
136 else if (WIFCONTINUED (status))
137 {
138 infop->si_code = CLD_CONTINUED;
139 infop->si_status = SIGCONT;
140 }
141#endif
142 else
143 /* Can't happen. */
144 assert (! "What?");
145
146 return 0;
147}
148#endif
149
150
151int
152__waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
153{
154 /* __waitpid should be a cancellation point. */
155 return do_waitid (idtype, id, infop, options);
156}
157weak_alias (__waitid, waitid)
158strong_alias (__waitid, __libc_waitid)
159

Warning: That file was not part of the compilation database. It may have many parsing errors.