ssize_t explain_readv_or_die(int fildes, const struct iovec *iov, int
iovcnt);
ssize_t explain_readv_on_error(int fildes, const struct iovec *iov, int
iovcnt);
DESCRIPTION
The explain_readv_or_die function is used to call the
readv(2) system call. On failure an explanation will be printed to
stderr, obtained from the explain_readv(3) function, and
then the process terminates by calling exit(EXIT_FAILURE).
The explain_readv_on_error function is used to call the
readv(2) system call. On failure an explanation will be printed to
stderr, obtained from the explain_readv(3) function, but
still returns to the caller.
fildes
The fildes, exactly as to be passed to the readv(2) system call.
iov
The iov, exactly as to be passed to the readv(2) system call.
iovcnt
The iovcnt, exactly as to be passed to the readv(2) system call.
RETURN VALUE
The explain_readv_or_die function only returns on success, see
readv(2) for more information. On failure, prints an explanation
and exits, it does not return.
The explain_readv_on_error function always returns the value return
by the wrapped readv(2) system call.
EXAMPLE
The explain_readv_or_die function is intended to be used in a
fashion similar to the following example:
ssize_t result = explain_readv_or_die(fildes, iov, iovcnt);