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Dogcows Code - chaz/tar/blob - lib/waitpid.c
1 /* Emulate waitpid on systems that just have wait.
2 Copyright 1994, 1995, 1998, 1999, 2007 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; see the file COPYING.
16 If not, write to the Free Software Foundation,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
23 #include <sys/types.h>
31 #define WAITPID_CHILDREN 8
32 static pid_t waited_pid
[WAITPID_CHILDREN
];
33 static int waited_status
[WAITPID_CHILDREN
];
36 waitpid (pid_t pid
, int *stat_loc
, int options
)
41 if (!options
&& (pid
== -1 || 0 < pid
))
43 /* If we have already waited for this child, return it immediately. */
44 for (i
= 0; i
< WAITPID_CHILDREN
; i
++)
47 if (p
&& (p
== pid
|| pid
== -1))
54 /* The child has not returned yet; wait for it, accumulating status. */
55 for (i
= 0; i
< WAITPID_CHILDREN
; i
++)
58 p
= wait (&waited_status
[i
]);
61 if (p
== pid
|| pid
== -1)
67 /* We cannot emulate this wait call, e.g. because of too many children. */
73 *stat_loc
= waited_status
[i
];
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