table of contents
PARPORT_READ(9) | Parallel Port Devices | PARPORT_READ(9) |
NAME¶
parport_read - read a block of data from a parallel port
SYNOPSIS¶
ssize_t parport_read(struct parport * port, void * buffer, size_t len);
ARGUMENTS¶
port
buffer
len
DESCRIPTION¶
This will read up to len bytes of buffer to the port specified, using the IEEE 1284 transfer mode most recently negotiated to (using parport_negotiate), as long as that mode supports reverse transfers (peripheral to host).
It is the caller's responsibility to ensure that the first len bytes of buffer are available to write to.
This function returns the number of bytes transferred (if zero or positive), or else an error code.
COPYRIGHT¶
January 2017 | Kernel Hackers Manual 4.8. |