1GETUID(2)                     System Calls Manual                    GETUID(2)
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NAME

6       getuid, getgid, geteuid, getegid - get user and group identity
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SYNOPSIS

9       getuid( )
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11       geteuid( )
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13       getgid( )
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15       getegid( )
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DESCRIPTION

18       Getuid  returns  the  real  user ID of the current process, geteuid the
19       effective user ID.  The real user  ID  identifies  the  person  who  is
20       logged  in, in contradistinction to the effective user ID, which deter‐
21       mines his access permission at the moment.  It is thus useful  to  pro‐
22       grams  which  operate  using  the  `set  user ID' mode, to find out who
23       invoked them.
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25       Getgid returns the real group ID, getegid the effective group ID.
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SEE ALSO

28       setuid(2)
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ASSEMBLER

31       (getuid = 24.)
32       sys getuid
33       (real user ID in r0, effective user ID in r1)
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35       (getgid = 47.)
36       sys getgid
37       (real group ID in r0, effective group ID in r1)
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41                                                                     GETUID(2)