1 /* Pseudo implementation of waitid.
2 Copyright (C) 1997-2020 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.
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.
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.
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 <https://www.gnu.org/licenses/>. */
26 #include <sys/types.h>
27 #include <sysdep-cancel.h>
31 # define OUR_WAITID DO_WAITID
32 #elif !defined NO_DO_WAITID
33 # define OUR_WAITID do_waitid
38 OUR_WAITID (idtype_t idtype
, id_t id
, siginfo_t
*infop
, int options
)
51 if (id
< 0 || id
== 1)
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. */
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. */
79 || (options
& WNOWAIT
)
82 || ((options
& (WEXITED
|WSTOPPED
|WCONTINUED
))
83 != (WEXITED
| (options
& WSTOPPED
)))
87 __set_errno (ENOTSUP
);
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
,
102 /* `waitpid' set `errno' for us. */
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. */
115 /* Decode the status field and set infop members... */
116 infop
->si_signo
= SIGCHLD
;
117 infop
->si_pid
= child
;
120 if (WIFEXITED (status
))
122 infop
->si_code
= CLD_EXITED
;
123 infop
->si_status
= WEXITSTATUS (status
);
125 else if (WIFSIGNALED (status
))
127 infop
->si_code
= WCOREDUMP (status
) ? CLD_DUMPED
: CLD_KILLED
;
128 infop
->si_status
= WTERMSIG (status
);
130 else if (WIFSTOPPED (status
))
132 infop
->si_code
= CLD_STOPPED
;
133 infop
->si_status
= WSTOPSIG (status
);
136 else if (WIFCONTINUED (status
))
138 infop
->si_code
= CLD_CONTINUED
;
139 infop
->si_status
= SIGCONT
;
152 __waitid (idtype_t idtype
, id_t id
, siginfo_t
*infop
, int options
)
154 /* __waitpid should be a cancellation point. */
155 return do_waitid (idtype
, id
, infop
, options
);
157 weak_alias (__waitid
, waitid
)
158 strong_alias (__waitid
, __libc_waitid
)