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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.

ERRORS

       These functions are always successful.

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, 4.3BSD.

NOTES

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

       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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