/*

 Example for the stat() syscall

*/


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

#include <stdio.h>

#include <errno.h>
#include <pwd.h>


#define FILENAME "../test.txt"


int main(int argc, char **argv){

  /*

  int stat(const char *file_name, struct stat *buf);

  */

  struct stat fileInfo;
  int result;
  struct passwd * usrInfo;
  char * usrname; 

  result = stat(FILENAME, &fileInfo);
  /* alternative using file descriptor: fstat(2) */

  
  if (result) {

    if (errno == ENOENT) {
      printf("Error: File does not exist.\n");
      /* do specific error handling since file doesn't exist ... */
    }
    else {
      /* an error occured */
      printf("Error when calling stat(): %s\n", strerror(errno));
    }
  }
  else {

    printf("\n");

    printf("Call to stat() succeeded.\n");

    /* use fileInfo... */

    printf("File permissions: %04o\n", fileInfo.st_mode&07777);

    usrInfo = getpwuid(fileInfo.st_uid);

    if (usrInfo != NULL) {
      printf("Owner of file: %s\n", usrInfo->pw_name);
    }


    printf("\n");
  }
    
  return result;
}