ProvaPratica 2013.02.15

Esercizio 1 del 2013.02.15

/*
 *  Prova Pratica di Lab SO 2013.02.15
 *  http://www.cs.unibo.it/~renzo/so/pratiche/2013.02.15.pdf
 *  Es.1
 *  Eduardo Santarelli
 */
#include <stdio.h>
#include <errno.h>
#include <dirent.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>

/*  Selector function, called by scandir. Only selects
 *  palindrome file names. Discards implied directories.
 */
int dir_is_pal(const struct dirent* dir){
  int i,j;

  //discard implied dirs
  if(dir->d_name[0]=='.' && strlen(dir->d_name)<3)
    return 0;

  for(i=0, j=strlen(dir->d_name)-1; i<j; i++, j--)
    if(dir->d_name[i]!=dir->d_name[j])
      return 0;

  return 1;
}

int main(int argc, char** argv){
  struct dirent** entry;
  int i, items;
  pid_t pid;

  items=scandir("./", &entry, dir_is_pal, alphasort);

  for(i=0; i<items; i++){
    int status;
    if((pid=fork())) ; //do nothing
    else
      execl(entry[i]->d_name, entry[i]->d_name, (char*)0);
  }

  return EXIT_SUCCESS;
}

-Eduardo