2.8 How do I find the size of a file?

Use stat(), or fstat() if you have the file open.

These calls fill in a data structure containing all the information about the file that the system keeps track of; that includes the owner, group, permissions, size, last access time, last modification time, etc.

The following routine illustrates how to use stat() to get the file size.

#include <stdlib.h>
#include <stdio.h>

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

int get_file_size(char *path,off_t *size)
{
  struct stat file_stats;

  if(stat(path,&file_stats))
    return -1;

  *size = file_stats.st_size;
  return 0;
}

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