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man pages section 9: DDI and DKI Kernel Functions

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Updated: July 2017



putctl1 - send a control message with a one-byte parameter to a queue


#include <sys/stream.h>

int putctl1(queue_t *q, int type, int p);

Interface Level

Architecture independent level 1 (DDI/DKI).



Queue to which the message is to be sent.


Type of message.


One-byte parameter.


The putctl1() function, like putctl(9F), tests the type argument to make sure a data type has not been specified, and attempts to allocate a message block. The p parameter can be used, for example, to specify how long the delay will be when an M_DELAY message is being sent. putctl1() fails if type is M_DATA, M_PROTO, or M_PCPROTO , or if a message block cannot be allocated. If successful, putctl1() calls the put(9E) routine of the queue pointed to by q with the newly allocated and initialized message.

Return Values

On success, 1 is returned. 0 is returned if type is a data type, or if a message block cannot be allocated.


The putctl1() function can be called from user, interrupt, or kernel context.


See the putctl(9F) function page for an example of putctl1().

See Also

put(9E), allocb(9F), datamsg(9F), putctl(9F), putnextctl1(9F)

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