Getting Configurable System Information

Instead of hardcoding system values, use any of the portable alternatives:

Use sysconf(2), confstr(3C), and getconf(1) to get configurable system information, such as determining if the underlying operating system is 64 bits or 32 bits.
Use pathconf(2) to get configurable pathnames for files and directory values.
Use <limits.h> to get static system limits.

Beginning with the 11.0 release, sysconf() returns additional information:

the processor implementation
the operating system execution mode — 32 bit or 64 bit
whether the system is capable of running a 64-bit operating system

Additionally, the confstr() system call returns the appropriate compiler options, libraries, and lint options to build and check an application in a 32-bit or 64-bit programming environment.

For More Information:

See the man page for limits(5) for details on macros available in <limits.h>.
See the man pages for sysconf(2), confstr(3C), getconf(1), and pathconf(2).

Getting Configurable System Information

Technical documentation

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