#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

int main()
{
  struct stat buf;
  int rc = stat( "/bin/ls", &buf );
  printf( "%d\n", rc );

  if ( S_ISREG( buf.st_mode ) )   /* || S_ISLNK() */
  {
    printf( "Regular file detected\n" );

    printf( "%o\n", buf.st_mode & ( S_IRWXU | S_IRWXG | S_IRWXO ) );

    if ( buf.st_mode & ( S_IXUSR | S_IXGRP | S_IXOTH ) )
    {
      printf( "Looks executable to me\n" );

      /* exec() */
    }
  }

  return 0;
}