NAME
rtf_put - write data to a real-time fifo
SYNOPSIS
#include <rtl_fifo.h>
int rtf_put(unsigned int fifo, char * buf, int count);
DESCRIPTION
rtf_put writes a block of data to a real-time fifo (RT-
FIFO) previously created with a call to rtf_create(3).
fifo is the ID with which the RT-FIFO was created. buf is
the block of data to be written, while count is the size
of the block in bytes. This mechanism is available only
to real-time tasks; Linux processes use a write (2) to the
corresponding fifo device to enqueue data to a fifo. Sim
ilarly, Linux processes use read (2) or similar functions
to read the data previously written via rtf_put by a real-
time task.
The RT-FIFO is a mechanism, implemented as a character
device, to communicate between real-time tasks and ordi
nary Linux processes. The rtf_* functions are used by the
real-time tasks; Linux processes use standard character
device access functions such as read(2), write(2), and
select(2).
RETURN VALUE
On success, size is returned. On failure, -1 is returned,
and errno is set as described below.
ERRORS
-ENODEV
fifo is greater than or equal to RTF_NO.
-EINVAL
fifo is not a valid RT-FIFO identifier.
-ENOSPC
insufficient space is available in the RT-FIFO for
count bytes.
SEE ALSO
read(2), rtf_create(3), rtf_create_handler(3),
rtf_destroy(3), rtf_get(3), write(2)
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