Returns the current offset for a file.

This function is compatible with the following targets:

ANSI

BeOS

EMB/RTOS

Mac OS

Palm OS

Win32

#include <unix.h>

long tell(int fildes);

Parameters for this facility are:

fildes

int

The file descriptor

This function returns the current offset for the file associated with the file descriptor fildes. The value is the number of bytes from the file's beginning.

If it is successful, tell() returns the offset. If it encounters an error, tell() returns -1L

"ftell"

"lseek"

#include <stdio.h>
#include <unix.h>

int main(void)
{
	int fd;
	long int pos;

	fd = open("mytest", O_RDWR | O_CREAT | O_TRUNC);
	write(fd, "Hello world!\n", 13);
	write(fd, "How are you doing?\n", 19);

	pos = tell(fd);

	printf("You're at position %ld.", pos);

	close(fd);

	return 0;
}
Result
This program prints the following to standard output:
You're at position 32.


 





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Last updated: August 16, 2000