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NAME

       getuid, geteuid - get user identity

SYNOPSIS

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

       uid_t getuid(void);
       uid_t geteuid(void);

DESCRIPTION

       getuid() returns the real user ID of the calling process.

       geteuid() returns the effective user ID of the calling process.

       When  a  normal program is executed, the effective and real user ID of the process are set
       to the ID of the user executing the file.  When a set ID program is executed the real user
       ID  is  set to the calling user and the effective user ID corresponds to the set ID bit on
       the file being executed.

ERRORS

       These functions are always successful.

CONFORMING TO

       POSIX.1-2001, 4.3BSD.

NOTES

   History
       In UNIX V6 the getuid() call returned (euid << 8) +  uid.   UNIX  V7  introduced  separate
       calls getuid() and geteuid().

NOTES

       The  original  Linux  getuid()  and geteuid() system calls supported only 16-bit user IDs.
       Subsequently, Linux 2.4 added getuid32() and  geteuid32(),  supporting  32-bit  IDs.   The
       glibc  getuid()  and  geteuid()  wrapper  functions transparently deal with the variations
       across kernel versions.

SEE ALSO

       getresuid(2), setreuid(2), setuid(2), credentials(7)

COLOPHON

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