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

6       getuid, geteuid - get user identification
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SYNOPSIS

9       #include <unistd.h>
10       #include <sys/types.h>
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12       uid_t
13       getuid()
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15       uid_t
16       geteuid()
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DESCRIPTION

19       The  getuid  function  returns the real user ID of the calling process.
20       The geteuid function returns the  effective  user  ID  of  the  calling
21       process.
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23       The  real  user ID is that of the user who has invoked the program.  As
24       the effective user ID gives the process additional  permissions  during
25       execution  of  ``set-user-ID'' mode processes, getuid is used to deter‐
26       mine the real-user-id of the calling process.
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ERRORS

29       The getuid and geteuid functions are always successful, and  no  return
30       value is reserved to indicate an error.
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SEE ALSO

33       getgid(2), setreuid(2)
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STANDARDS

36       Geteuid and getuid conform to IEEE Std 1003.1-1988 (``POSIX'').
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404.2 Berkeley Distribution      December 2, 1997                      GETUID(2)