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devsw_get(9r)
NAME
  devsw_get - General: Returns the entry points and major number for a device
  driver

SYNOPSIS
  #include <sys/conf.h>


  int devsw_get(
	  char *driver_name,
	  int driver_reg_instance,
	  int major_number,
	  struct dsent *dsent_ptr );

ARGUMENTS
  driver_name
      Specifies a null-terminated string that represents the name of the
      device driver.

  driver_reg_instance
      Specifies an integer that represents a specific reservation instance
      for this driver. This argument allows a driver to uniquely identify
      multiple major numbers for the driver.

  major_number
      Specifies the major number for the driver.

  dsent_ptr
      Specifies a pointer to the device switch structure that contains
      pointers to the device driver's entry points for the system service's
      I/O requests and other information.

DESCRIPTION
  The devsw_get interface returns a device driver's I/O services interfaces
  and major number. Tru64 UNIX reserves this major number across boots.

RETURN VALUES
  Upon successful completion, the devsw_get interface returns the reserved
  major number. Otherwise, on an error, the devsw_get interface returns the
  value -1. The following list describes possible error conditions:

    ·  The devsw_get interface is not available to be called at this point in
       the driver.

    ·  The name you passed to the driver_name argument is not a valid name.

    ·  The pointer passed to the dsent_ptr argument is not valid.


SEE ALSO
  Kernel Interfaces: devsw_del(9r), devsw_add(9r)


  Data Structures: dsent(9s)

Index for Section 9

Alphabetical listing for D

Top of page