Programmer Reference : Native Process Framework (OsProcess) : OsVastSubprocess
OsVastSubprocess
Description
Instances of <OsVastSubprocess> are cross-platform handles representing operating system processes that have been spawned by VAST
Stdio Streams
Instances of this class add the concepts of stdio streams to a native process.
• #inputStream - A write stream connecting to the stdin on the subprocess
• #outputStream - A read stream connecting to the stdout of the subprocess
• #errorStream - A read stream connecting to the stderr of the subprocess
Tracing
Instances of this class also add the concept of tracing. This trace information provides detailed info about the spawning of the subprocess.
• #traceStream - A read stream on the optional trace information for the process.
Class Methods
all 
  Private: Use OsProcesses>>spawned
     Answer an array of pid sorted subprocesses of VAST
     that were active at the time this call was made

     Answers:
        <Array>
deadlockAvoidanceMs 
  Answer the wait (in milliseconds) that occurs in the
     DeadlockAvoidance process loop

     Answers:
        <Integer>
deadlockAvoidanceMs: 
  Set the wait (in milliseconds) that occurs in the
     DeadlockAvoidance process loop

     A lower number means less time for the os pipe buffer to fill up
Instance Methods
closeStreams 
  Close all stdio streams.
     Ignore any exceptions
errorStream 
  Answer the stderr stream of the process.
     @see OsNativeProcess>>stderrStream comments for more details.

     Answers:
        <OsProcessStream>
inputStream 
  Answer the stdin stream of the process.
     @see OsNativeProcess>>stdinStream comments for more details.

     Answers:
        <OsProcessStream>
isDetached 
  Answer true if this subprocess is running in detached mode, false otherwise.
     @see OsProcessStarter>>detached for a detailed description

     Answers:
        <Boolean>
isVastSubprocess 
  Object check

     Answers:
        <Boolean> true
outputStream 
  Answer the stdout stream of the process.
     @see OsNativeProcess>>stdoutStream comments for more details.

     Answers:
        <OsProcessStream>
traceStream 
  Answer the newline separated tracing read stream.
     If tracing was not enabled, then this stream will
     be positioned at the end.

     A 'trace' will capture information regarding the details
     of how the subprocess was spawned, along with any
     errors that may have occurred.

     Answers:
        <ReadStream>
Last modified date: 07/07/2022