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Test Your Knowledge in Computers #545
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Global constants are variables whose values can be changed once the variable is set.
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bcanput(9f) [bsd man page]

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)

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