size_t vrb_read(vrb_p vrb, int fd, size_t size);
DESCRIPTIONvrb_read reads data from a specified open file descriptor using read(2) into the specified virtual ring buffer until the specified maximum length has been read, the buffer is full, or end-of-file, or an error is returned (including EAGAIN or EWOULDBLOCK for a non-blocking descriptor).
specifies which virtual ring buffer.
specifies the open file descriptor to read from
specifies the maximum length to read, or ~0 for unlimited.
If successful, the actual length of data read into the buffer is returned. If end-of-file occurs, the return value is ~0 and errno is 0. If an error occurs from read(2), the return value is ~0 and errno is set by read(2). Note that this is a different way of returning an end-of-file condition than read(2) uses.
ERRORSIf an error is returned, then errno will have one of the following values:
- An end-of-file has occurred. Note that this is a different way of returning an end-of-file condition than read(2) uses.
- An invalid virtual ring buffer pointer was specified.