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- #if HAVE_CONFIG_H
- # include <config.h>
- #endif
- #include <errno.h>
- #ifndef errno
- extern int errno;
- #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))
- {
-
- for (i = 0; i < WAITPID_CHILDREN; i++)
- {
- p = waited_pid[i];
- if (p && (p == pid || pid == -1))
- {
- waited_pid[i] = 0;
- goto success;
- }
- }
-
- 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;
- }
- }
-
- errno = EINVAL;
- return -1;
- success:
- if (stat_loc)
- *stat_loc = waited_status[i];
- return p;
- }
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