bcanput(9F) Kernel Functions for Drivers bcanput(9F)NAME
bcanput - test for flow control in specified priority band
SYNOPSIS
#include <sys/stream.h>
int bcanput(queue_t *q, unsigned char pri);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
q Pointer to the message queue.
pri Message priority.
DESCRIPTION
bcanput() searches through the stream (starting at q) until it finds a queue containing a service routine where the message can be
enqueued, or until it reaches the end of the stream. If found, the queue containing the service routine is tested to see if there is room
for a message of priority pri in the queue.
If pri is 0, bcanput() is equivalent to a call with canput(9F).
canputnext(q) and bcanputnext(q, pri) should always be used in preference to canput(q->q_next) and bcanput(q->q_next, pri) respectively.
RETURN VALUES
1 If a message of priority pri can be placed on the queue.
0 If the priority band is full.
CONTEXT
bcanput() can be called from user or interrupt context.
SEE ALSO bcanputnext(9F), canput(9F), canputnext(9F), putbq(9F), putnext(9F)
Writing Device Drivers
STREAMS Programming Guide
WARNINGS
Drivers are responsible for both testing a queue with bcanput() and refraining from placing a message on the queue if bcanput() fails.
SunOS 5.10 11 Apr 1991 bcanput(9F)
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bcanput(9F) Kernel Functions for Drivers bcanput(9F)NAME
bcanput - test for flow control in specified priority band
SYNOPSIS
#include <sys/stream.h>
int bcanput(queue_t *q, unsigned char pri);
INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI).
PARAMETERS
q Pointer to the message queue.
pri Message priority.
DESCRIPTION
bcanput() searches through the stream (starting at q) until it finds a queue containing a service routine where the message can be
enqueued, or until it reaches the end of the stream. If found, the queue containing the service routine is tested to see if there is room
for a message of priority pri in the queue.
If pri is 0, bcanput() is equivalent to a call with canput(9F).
canputnext(q) and bcanputnext(q, pri) should always be used in preference to canput(q->q_next) and bcanput(q->q_next, pri) respectively.
RETURN VALUES
1 If a message of priority pri can be placed on the queue.
0 If the priority band is full.
CONTEXT
bcanput() can be called from user or interrupt context.
SEE ALSO bcanputnext(9F), canput(9F), canputnext(9F), putbq(9F), putnext(9F)
Writing Device Drivers
STREAMS Programming Guide
WARNINGS
Drivers are responsible for both testing a queue with bcanput() and refraining from placing a message on the queue if bcanput() fails.
SunOS 5.10 11 Apr 1991 bcanput(9F)
What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file.
# When the shell exits, append to the history file instead of overwriting it
shopt -s histappend (3 Replies)