int explain_fcntl_or_die(int fildes, int command, long arg);
DESCRIPTION
The explain_fcntl_or_die function
is used to call the fcntl(2) system
call. On failure an explanation will be
printed to stderr,
obtained from explain_fcntl(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:
int result = explain_fcntl_or_die(fildes, command, arg);
fildes
The fildes, exactly as to be passed to the fcntl(2) system call.
command
The command, exactly as to be passed to the fcntl(2) system call.
arg
The arg, exactly as to be passed to the fcntl(2) system call.
Returns:
This function only returns on success, and it returns whatever was
returned by the fcntl(2) call; depending on the command, this
may have no use.
On failure, prints an explanation and exits, it does not return.