Note: This function is supported in AIX® 5.1 and earlier only.
Initializes a token-ring device handler and allocates the required system resources.
#include <sys/device.h> #include <sys/comio.h> #include <sys/tokuser.h> int tokopen (devno, devflag, chan, arg) dev_t devno; ulong devflag; int chan; struct kopen_ext * arg;
Item | Description |
---|---|
devno | Specifies major and minor device numbers. |
devflag | Specifies
the flag word with the following definitions:
|
chan | Specifies the channel number assigned by the tokmpx entry point. |
arg | Points to a kopen_ext structure for kernel-mode processes. For user-mode processes, this field is not used. |
The tokopen entry point is called when a user-mode caller issues an open, openx, or creat subroutine. The tokopen routine can also be invoked in response to an fp_opendev kernel service. The device is opened to read and write data.
The tokopen 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 tokopen entry point can be called from the process environment only.
Item | Description |
---|---|
ENXIO | Indicates the specified minor number is not valid. |
EINVAL | Indicates a specified parameter is not valid. |
ENOMEM | Indicates the device handler was unable to allocate the required memory. |