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RedHat 9 (Linux i386) - man page for personality (redhat section 2)

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

       personality - set the process execution domain

       int personality(unsigned long persona);

       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.

       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.

       EINVAL persona does not refer to a valid execution domain.


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

Linux 2.0				    1996-07-22				   PERSONALITY(2)
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