NAME

explain_readv_or_die - read data into multiple buffers and report errors

SYNOPSIS

#include <libexplain/readv.h>

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);

NAME

SYNOPSIS

DESCRIPTION

RETURN VALUE

EXAMPLE

SEE ALSO

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