man vrb_write (3): write data from a VRB

LIBRARY

-lvrb

SYNOPSIS

#include <vrb.h>

size_t vrb_write(vrb_p vrb, int fd, size_t size);

DESCRIPTION

vrb_write writes data to a specified open file descriptor using write(2) from the specified virtual ring buffer until the specified maximum length has been written, the buffer is full, or an error is returned (including EAGAIN or EWOULDBLOCK for a non-blocking descriptor).

ARGUMENTS

vrb_p vrb
specifies which virtual ring buffer.

int fd
specifies the open file descriptor to write to

size_t size
specifies the maximum length to write, or ~0 for unlimited (all of buffer).

RETURN VALUE

size_t
If successful, the actual length of data written from the buffer is returned. If no data was available to be written, 0 will be returned. If an error occurs from write(2), the return value is ~0 and errno is set by write(2).

ERRORS

If an error is returned, then errno will have one of the following values:

0: An end-of-file has occurred. Note that this is a different way of returning an end-of-file condition than write(2) uses.
EINVAL: An invalid virtual ring buffer pointer was specified.