STREAMS Parameters

Description: Specifies the number of modules that can be inserted into (pushed onto) a STREAM.
Data Type: Signed integer
Default: 9
Range: 9 to 16
Units: Modules
Dynamic?: Yes
Validation: None
When to Change: At the direction of your software vendor. No messages are displayed when a STREAM exceeds its permitted push count. A value of EINVAL is returned to the program that attempted the push.
Commitment Level: Unstable

Description: Specifies the maximum number of bytes that a single system call can pass to a STREAM to be placed in the data part of a message. Any write exceeding this size is broken into multiple messages. For more information, see write(2).
Data Type: Signed integer
Default: 65,536
Range: 0 to 262,144
Units: Bytes
Dynamic?: Yes
Validation: None
When to Change: When putmsg calls return ERANGE. For more information, see putmsg(2).
Commitment Level: Unstable

Description: Specifies the maximum number of bytes that a single system call can pass to a STREAM to be placed in the control part of a message
Data Type: Signed integer
Default: 1024
Range: 0 to MAXINT
Units: Bytes
Dynamic?: Yes
Validation: None
When to Change: At the direction of your software vendor. putmsg(2) calls return ERANGE if they attempt to exceed this limit.
Commitment Level: Unstable