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OS/pintos-env/pintos/examples/recursor.c

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#include <stdio.h>
#include <stdlib.h>
#include <syscall.h>
int
main (int argc, char *argv[])
{
char buffer[128];
pid_t pid;
int retval = 0;
if (argc != 4)
{
printf ("usage: recursor <string> <depth> <waitp>\n");
exit (1);
}
/* Print args. */
printf ("%s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
/* Execute child and wait for it to finish if requested. */
if (atoi (argv[2]) != 0)
{
snprintf (buffer, sizeof buffer,
"recursor %s %d %s", argv[1], atoi (argv[2]) - 1, argv[3]);
pid = exec (buffer);
if (atoi (argv[3]))
retval = wait (pid);
}
/* Done. */
printf ("%s %s: dying, retval=%d\n", argv[1], argv[2], retval);
exit (retval);
}