freeb(9r) freeb(9r)
NAME
freeb - STREAMS: Frees a message block
SYNOPSIS
#include <sys/stream.h>
void freeb(
MBLKP message_block_ptr );
ARGUMENTS
Specifies a pointer to the message block to be deallocated. The typedef MBLKP is an alternate name for typedef struct msgb *.
DESCRIPTION
The freeb interface deallocates a message block. If the reference count of the db_ref member of the datab structure is greater than the
value 1, freeb decrements the count. If db_ref equals the value 1, freeb deallocates the message block and the corresponding data block and
buffer.
If the data buffer to be freed was allocated in a call to the esballoc interface, the buffer may be a non-STREAMS resource. In that case,
the driver must be notified that the attached data buffer needs to be freed by calling the driver's freeing interface. To make this process
independent of the driver used in the stream, freeb finds the free_rtn structure associated with the buffer. The free_rtn structure con-
tains a pointer to the driver-independent interface that releases the buffer. Once this is accomplished, freeb releases the STREAMS
resources associated with the buffer.
RETURN VALUES
None
SEE ALSO
Kernel Interfaces: allocb(9r), dupb(9r), esballoc(9r)
Programmer's Guide: STREAMS
freeb(9r)
