5.3.2. LIRC write()¶
5.3.2.1. Name¶
lirc-write - Write to a LIRC device
5.3.2.3. Arguments¶
fd
- File descriptor returned by
open()
. buf
- Buffer with data to be written
count
- Number of bytes at the buffer
5.3.2.4. Description¶
write() writes up to count
bytes to the device
referenced by the file descriptor fd
from the buffer starting at
buf
.
The data written to the chardev is a pulse/space sequence of integer
values. Pulses and spaces are only marked implicitly by their position.
The data must start and end with a pulse, therefore, the data must
always include an uneven number of samples. The write function must
block until the data has been transmitted by the hardware. If more data
is provided than the hardware can send, the driver returns EINVAL
.
5.3.2.5. Return Value¶
On success, the number of bytes read is returned. It is not an error if
this number is smaller than the number of bytes requested, or the amount
of data required for one frame. On error, -1 is returned, and the errno
variable is set appropriately. The generic error codes are described at the
Generic Error Codes chapter.