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69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/* Emulate waitpid on systems that just have wait.
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Copyright (C) 1994 Free Software Foundation, Inc.
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This file is part of GNU DIFF.
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GNU DIFF is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU DIFF is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU DIFF; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "system.h"
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#define WAITPID_CHILDREN 8
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static pid_t waited_pid[WAITPID_CHILDREN];
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static int waited_status[WAITPID_CHILDREN];
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pid_t
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waitpid (pid, stat_loc, options)
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pid_t pid;
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int *stat_loc;
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int options;
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{
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int i;
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pid_t p;
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if (!options && (0 < pid || pid == -1))
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{
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/* If we have already waited for this child, return it immediately. */
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for (i = 0; i < WAITPID_CHILDREN; i++)
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{
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p = waited_pid[i];
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if (p && (p == pid || pid == -1))
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{
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waited_pid[i] = 0;
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goto success;
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}
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}
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/* The child has not returned yet; wait for it, accumulating status. */
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for (i = 0; i < WAITPID_CHILDREN; i++)
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if (! waited_pid[i])
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{
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p = wait (&waited_status[i]);
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if (p < 0)
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return p;
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if (p == pid || pid == -1)
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goto success;
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waited_pid[i] = p;
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}
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}
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/* We cannot emulate this wait call, e.g. because of too many children. */
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abort ();
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success:
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if (stat_loc)
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*stat_loc = waited_status[i];
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return p;
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}
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