The explain_readlink_or_die function is used to call the
readlink(2) system call. On failure an explanation will be printed
to stderr, obtained from the explain_readlink(3) function,
and then the process terminates by calling exit(EXIT_FAILURE).
The explain_readlink_on_error function is used to call the
readlink(2) system call. On failure an explanation will be printed
to stderr, obtained from the explain_readlink(3) function,
but still returns to the caller.
pathname
The pathname, exactly as to be passed to the readlink(2) system
call.
data
The data, exactly as to be passed to the readlink(2) system call.
data_size
The data_size, exactly as to be passed to the readlink(2) system
call.
RETURN VALUE
The explain_readlink_or_die function only returns on success, see
readlink(2) for more information. On failure, prints an explanation
and exits, it does not return.
The explain_readlink_on_error function always returns the value
return by the wrapped readlink(2) system call.
EXAMPLE
The explain_readlink_or_die function is intended to be used in a
fashion similar to the following example:
ssize_t result = explain_readlink_or_die(pathname, data, data_size);