Parameter values returned to the application

ERRNO

A fullword binary field; if RETCODE is negative, this contains an error number. See Return codes for information about ERRNO return codes.

RETCODE

A fullword binary field

Value: Meaning
>0: The number of ready sockets.
0: Either the SELECTEX time limit has expired (ECB value is 0) or one of the caller's ECBs has been posted (ECB value is nonzero and the caller's descriptor sets is set to 0). The caller must initialize the ECB values to 0 before issuing the SELECTEX socket command.
-1: Check ERRNO for an error code.

RRETMSK

The bit-mask array returned by the SELECT if RSNDMSK is specified. The length of this bit-mask array is dependent on the value in MAXSOC.

WRETMSK

The bit-mask array returned by the SELECT if WSNDMSK is specified. The length of this bit-mask array is dependent on the value in MAXSOC.

ERETMSK

The bit-mask array returned by the SELECT if ESNDMSK is specified. The length of this bit-mask array is dependent on the value in MAXSOC.