Determines whether a specified event has occurred on the token-ring device.
#include <sys/device.h> #include <sys/comio.h> #include <sys/tokuser.h>
int tokselect (devno, events, reventp, chan) dev_t devno; ushort events; ushort *reventp; int chan;
| devno | Specifies major and minor device numbers. | ||||||||
| events | Specifies the conditions to check, denoted by the bitwise OR of one or more of the following:
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| reventp | Points to the result of condition checks. A bitwise OR one of the following conditions is returned:
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| chan | Specifies the channel number assigned by the tokmpx entry point. |
Note: Only user-mode callers should call this entry point.
The tokselect entry point is called when the select or poll subroutine is used to determine if a specified event has occurred on the token-ring device.
When the token-ring device handler is in a state in which the event can never be satisfied (for example, an adapter failure), then the tokselect entry point sets the returned events flags to 1 for the event that cannot be satisfied. This prevents the select or poll subroutines from waiting indefinitely.
The tokselect entry point can only be called from the process environment.
| ENXIO | Indicates the specified minor number is not valid. |
| EACCES | Indicates a call from a kernel process is not valid. |
The tokselect entry point functions with a Token-Ring High Performance Network Adapter that has been correctly configured for use on a qualified network. Consult adapter specifications for more information on configuring the adapter and network qualifications.
The poll subroutine, select subroutine.
Select/Poll Logic for ddwrite and ddread Routines.