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BSD 2.11 - man page for getuid (bsd section 2)

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GETUID(2)										GETUID(2)

       getuid, geteuid - get user identity

       #include <sys/types.h>

       uid = getuid()
       uid_t uid;

       euid = geteuid()
       uid_t euid;

       Getuid returns the real user ID of the current process, geteuid 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
       getuid to determine the real-user-id of the process that invoked them.

       getgid(2), setreuid(2)

4th Berkeley Distribution		 January 7, 1986				GETUID(2)
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