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Shell Programming and Scripting
How to keep white space is being deleted using read
Post 22277 by Perderabo on Thursday 30th of May 2002 02:15:20 PM
05-30-2002
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LEARN ABOUT DEBIAN
putbq
putbq(9F) Kernel Functions for Drivers putbq(9F) NAME
putbq - place a message at the head of a queue SYNOPSIS
#include <sys/stream.h> int putbq(queue_t *q, mblk_t *bp); INTERFACE LEVEL
Architecture independent level 1 (DDI/DKI). PARAMETERS
q Pointer to the queue. bp Pointer to the message block. DESCRIPTION
putbq() places a message at the beginning of the appropriate section of the message queue. There are always sections for high priority and ordinary messages. If other priority bands are used, each will have its own section of the queue, in priority band order, after high prior- ity messages and before ordinary messages. putbq() can be used for ordinary, priority band, and high priority messages. However, unless precautions are taken, using putbq() with a high priority message is likely to lead to an infinite loop of putting the message back on the queue, being rescheduled, pulling it off, and putting it back on. This function is usually called when bcanput(9F) or canput(9F) determines that the message cannot be passed on to the next stream compo- nent. The flow control parameters are updated to reflect the change in the queue's status. If QNOENB is not set, the service routine is enabled. RETURN VALUES
putbq() returns 1 upon success and 0 upon failure. Note - Upon failure, the caller should call freemsg(9F) to free the pointer to the message block. CONTEXT
putbq() can be called from user or interrupt context. EXAMPLES
See the bufcall(9F) function page for an example of putbq(). SEE ALSO
bcanput(9F), bufcall(9F), canput(9F), getq(9F), putq(9F) Writing Device Drivers STREAMS Programming Guide SunOS 5.10 28 Aug 2001 putbq(9F)