Manpage of MAX

MAX

Section: Linux Fast-STREAMS DDI/DKI (9)
Updated: 2008-10-31
Index Return to Main Contents

NAME

max - determine the maximum of two integers

SYNOPSIS

#include <sys/stream.h>
#include <sys/ddi.h>
int max(int a, int b);

ARGUMENTS

a: first integer to compare.
b: second integer to compare.

INTERFACE

DDI/DKI.

DESCRIPTION

max() returns the maximum of the two integers a and b.

USAGE

max() is a basic function that is used to determine the maximum of two integers.

RETURN

max() returns the maximum of the two integers a and b.

ERRORS

max() always succeeds.

CONTEXT

max() can be called from any context, including user context, module procedures, callouts, callbacks, soft interrupts (tasklets and bottom halves), and interrupt service routines.

MP-STREAMS

max() is MP-safe.

NOTICES

There are other versions of this function (or macro) avaliable from the Linux kernel.

max() should not be used to compare unsigned sequence numbers.

Portable STREAMS drivers and modules will only use max() to compare two integers.

IMPLEMENTATION

max() is implemented as an extern inline function as follows:


#undef max
__EXTERN_INLINE int max(int a, int b)
{
    return ((a < b) ? b : a);
}

BUGS

max() has no known bugs.

COMPATIBILITY

max() is compatible with SVR 4.2 MP DDI/DKI[1] and systems based on SVR 4.2 MP, with the following portability considerations:

---: max() is provided for source level compatibility with SVR 4.2 for the purpose of porting SVR 4.2 drivers to Linux. Because internal structures and definitions for Linux Fast-STREAMS[2] differ from that of SVR 4.2 binaries are incompatible.
---: max() only provides functionality comparable to SVR 4.2 for use by STREAMS drivers and modules. Any and all functionality provided by max() in support of non-STREAMS devices are not supported.

See STREAMS(9) for more compatibility information.

CONFORMANCE

SVR 4.2 MP DDI/DKI[1,3].

HISTORY

max() first appeared in SVR 3[4].

REFERENCES

[1]: USL DDI/DKI, Device Driver Interface/Driver-Kernel Interface (DDI/DKI) Reference Manual for Intel Processors, 1992, (Englewood Cliffs, New Jersey), AT&T UNIX System Laboratories, Inc., Prentice Hall.
[2]: streams-0.9.2, Linux Fast-STREAMS (LfS) 0.9.2 Source Code, Brian Bidulock, ed., OpenSS7 Corporation. <http://www.openss7.org/>
[3]: SVR 4.2, STREAMS Programmer's Guide, 1992, (Englewood Cliffs, New Jersey), AT&T UNIX System Laboratories, Inc., Prentice Hall.
[4]: SVR 3, UNIX® System V Release 3 Programmer's Manual, (Englewood Cliffs, New Jersey), AT&T UNIX System Laboratories, Inc., Prentice Hall.

TRADEMARKS

OpenSS7tm: is a trademark of OpenSS7 Corporation.
Linux®: is a registered trademark of Linus Torvalds.
UNIX®: is a registered trademark of The Open Group.
Solaris®: is a registered trademark of Sun Microsystems.

Other trademarks are the property of their respective owners.

IDENTIFICATION

Linux Fast-STREAMS: Package streams version 0.9.2.4 released 2008-10-31.

Index

NAME
SYNOPSIS
ARGUMENTS
INTERFACE
DESCRIPTION
USAGE
RETURN
ERRORS
CONTEXT
MP-STREAMS
NOTICES
IMPLEMENTATION
SEE ALSO
BUGS
COMPATIBILITY
CONFORMANCE
HISTORY
REFERENCES
TRADEMARKS
IDENTIFICATION

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