CS318 - Pintos
Pintos source browser for JHU CS318 course
recursor.c
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1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <syscall.h>
4 
5 int
6 main (int argc, char *argv[])
7 {
8  char buffer[128];
9  pid_t pid;
10  int retval = 0;
11 
12  if (argc != 4)
13  {
14  printf ("usage: recursor <string> <depth> <waitp>\n");
15  exit (1);
16  }
17 
18  /* Print args. */
19  printf ("%s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
20 
21  /* Execute child and wait for it to finish if requested. */
22  if (atoi (argv[2]) != 0)
23  {
24  snprintf (buffer, sizeof buffer,
25  "recursor %s %d %s", argv[1], atoi (argv[2]) - 1, argv[3]);
26  pid = exec (buffer);
27  if (atoi (argv[3]))
28  retval = wait (pid);
29  }
30 
31  /* Done. */
32  printf ("%s %s: dying, retval=%d\n", argv[1], argv[2], retval);
33  exit (retval);
34 }
snprintf
int snprintf(char *buffer, size_t buf_size, const char *format,...)
Like printf(), except that output is stored into BUFFER, which must have space for BUF_SIZE character...
Definition: stdio.c:62
atoi
int atoi(const char *s)
Converts a string representation of a signed decimal integer in S into an ‘int’, which is returned.
Definition: stdlib.c:10
exec
pid_t exec(const char *file)
Definition: syscall.c:79
main
int main(int argc, char *argv[])
Definition: recursor.c:6
buffer
static struct intq buffer
Stores keys from the keyboard and serial port.
Definition: input.c:7
printf
int printf(const char *format,...)
Writes formatted output to the console.
Definition: stdio.c:79
wait
static void wait(struct intq *q, struct thread **waiter)
pid_t
int pid_t
Process identifier.
Definition: syscall.h:8
stdlib.h
exit
void exit(int status)
Definition: syscall.c:72
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