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/* Emulate waitpid on systems that just have wait.
Copyright 1994, 1995, 1998, 1999, 2010, 2011 Free Software
Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* config.h must always be included first. */
#include <config.h>
/* system headers. */
#include <errno.h>
/* TODO: replace this with gnulib's waitpid. */
#if defined _MSC_VER || defined __MINGW32__
/* Native Woe32 API. */
#include <process.h>
#else
/* Unix API. */
#include <sys/wait.h>
#endif
#define WAITPID_CHILDREN 8
static pid_t waited_pid[WAITPID_CHILDREN];
static int waited_status[WAITPID_CHILDREN];
pid_t
waitpid (pid_t pid, int *stat_loc, int options)
{
int i;
pid_t p;
if (!options && (pid == -1 || 0 < pid))
{
/* If we have already waited for this child, return it immediately. */
for (i = 0; i < WAITPID_CHILDREN; i++)
{
p = waited_pid[i];
if (p && (p == pid || pid == -1))
{
waited_pid[i] = 0;
goto success;
}
}
/* The child has not returned yet; wait for it, accumulating status. */
for (i = 0; i < WAITPID_CHILDREN; i++)
if (! waited_pid[i])
{
p = wait (&waited_status[i]);
if (p < 0)
return p;
if (p == pid || pid == -1)
goto success;
waited_pid[i] = p;
}
}
/* We cannot emulate this wait call, e.g. because of too many children. */
errno = EINVAL;
return -1;
success:
if (stat_loc)
*stat_loc = waited_status[i];
return p;
}
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