geteuid man page on Ultrix

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getuid(2)							     getuid(2)

Name
       getuid, geteuid - get user identity

Syntax
       #include <sys/types.h>
       #include <unistd.h>

       uid = getuid()
       uid_t uid;

       euid = geteuid()
       uid_t euid;

Description
       The  system  call  returns the real user ID of the current process, the
       effective user ID.

       The real user ID identifies the person who is logged in.	 The effective
       user  ID	 gives	the process additional permissions during execution of
       “set-user-ID” mode processes, which use to determine  the  real-user-id
       of the process which invoked them.

Environment
   System Five
       Differs	from  the System V definition in that the return values are of
       type int, instead of unsigned short.

   POSIX
       When your program is compiled in POSIX mode, the and functions return a
       value of type uid_t.  The and functions return a value of type gid_t.

See Also
       getgid(2), setreuid(2)

								     getuid(2)
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