explain_lseek_or_die3

Usage

Overview

The explain_lseek_or_die function is used to call the lseek(2) system call. On failure an explanation will be printed to stderr, obtained from explain_lseek(3), and then the process terminates by calling exit(EXIT_FAILURE).

This function is intended to be used in a fashion similar to the following example:

long long result = explain_lseek_or_die(fildes, offset, whence);

fildes

The fildes, exactly as to be passed to the lseek(2) system call.

offset

The offset, exactly as to be passed to the lseek(2) system call.

whence

The whence, exactly as to be passed to the lseek(2) system call.

Returns:

On successful, returns the resulting offset location as measured in bytes from the beginning of the file. On failure, prints an explanation and exits.