redhat man page for personality

PERSONALITY(2)						     Linux Programmer's Manual						    PERSONALITY(2)

NAME
       personality - set the process execution domain

SYNOPSIS
       int personality(unsigned long persona);

DESCRIPTION
       Linux supports different execution domains, or personalities, for each process. Among other things, execution domains tell Linux how to map
       signal numbers into signal actions. The execution domain system allows Linux to provide limited support for binaries compiled  under  other
       Unix-like operating systems.

       personality will make the execution domain referenced by persona the new execution domain of the current process.

RETURN VALUE
       On  success,  persona  is  made	the  new execution domain and the previous persona is returned. On error, -1 is returned, and errno is set
       appropriately.

ERRORS
       EINVAL persona does not refer to a valid execution domain.

FILES
       /usr/include/linux/personality.h

CONFORMING TO
       personality is Linux-specific and should not be used in programs intended to be portable.

Linux 2.0							    1996-07-22							    PERSONALITY(2)