/* popen.c by detour@metalshell.com
 *
 * Example of reading the output of another
 * program using popen() and pclose()
 *
 * http://www.metalshell.com/
 *
 */
#include <stdio.h>

int main() {
  FILE *in;
  extern FILE *popen();
  char buff[512];

  /* popen creates a pipe so we can read the output
     of the program we are invoking */
  if (!(in = popen("netstat -n", "r"))) {
    exit(1);
  }

  /* read the output of netstat, one line at a time */
  while (fgets(buff, sizeof(buff), in) != NULL ) {
    printf("Output: %s", buff);
  }

  /* close the pipe */
  pclose(in);
}