filelength

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Header File

io.h

Category

Input/output Routines

Prototype

long filelength(int handle);

Description

Gets file size in bytes.

filelength returns the length (in bytes) of the file associated with handle.

Return Value

On success filelength returns a long value the file length in bytes. On error it returns -1 and the global variable errno is set to

EBADF

Bad file number

Example

#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>
int main(void)
{
   int handle;
   char buf[11] = "0123456789";
   /* create a file containing 10 bytes */
   handle = open("DUMMY.FIL", O_CREAT);
   write(handle, buf, strlen(buf));
   /* display the size of the file */
   printf("file length in bytes: %ld\n", filelength(handle));
   /* close the file */
   close(handle);
   return 0;
}

Portability

POSIX	Win32	ANSI C	ANSI C++
	+