PIPESEMSTATE

PIPESEMSTATE

Status of a named pipe that is attached to a semaphore.

Type

BYTE   fStatus;
BYTE   fFlag
USHORT  usKey;
USHORT  usAvail

C Declaration Method

typedef struct

Fields

fStatus  A coded value that indicates the status of the named pipe.
         The following codes are available:
         0  NPSS_EOI 
            End of information buffer. No more information records follow, and
            subsequent fields in this information record have no defined value.
         1  NPSS_RDATA 
            Read data is available. 
         2  NPSS_WSPACE 
            Write space is available. 
         3  NPSS_CLOSE 
            The pipe is closed. 

fFlag    Additional information about the state of the named pipe.
         This parameter contains the following bit fields:
         Bit  Description 
         7-1  Reserved 
         0    NPSS_WAIT
              If set, a thread is waiting at the other end of the pipe.

usKey    A key value that distinguishes events arriving on different named
         pipes that are attached to the same semaphore. This value is specified
         in the key field when DosSetNPipeSem is issued.

usAvail  Number of bytes available in the pipe.
         If fStatus has a value of 1, this field contains the number of bytes
         of data that are available to read from the pipe. If fStatus has a
         value of 2, this field contains the number of bytes of write space
         that are available in the pipe.