itoemajor(D3DK) —

.IX \f4itoemajor\fP(D3DK)

NAME

itoemajor − convert internal to external major device number .IX major device number

SYNOPSIS

#include <sys/types.h>
#include <sys/ddi.h>
major_t itoemajor(major_t imaj, major_t prevemaj);

ARGUMENTS

imajInternal major number.

prevemajMost recently obtained external major number (or -1, if this is the first time the function has been called).

DESCRIPTION

itoemajor converts the internal major number to the external major number. The external-to-internal major number mapping can be many-to-one, and so any internal major number may correspond to more than one external major number. By repeatedly invoking this function and passing the most recent external major number obtained, the driver can obtain all possible external major number values. See getemajor(D3DK) for an explanation of external and internal major numbers.

RETURN VALUE

External major number, or NODEV, if all have been searched.

LEVEL

Base or Interrupt.

NOTES

Does not sleep.

Driver-defined basic locks, read/write locks, and sleep locks may be held across calls to this function.

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