4.4BSD/usr/share/man/cat2/geteuid.0

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GETUID(2)                   BSD Programmer's Manual                  GETUID(2)

NNAAMMEE
     ggeettuuiidd, ggeetteeuuiidd - get user identification

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<uunniissttdd..hh>>
     ##iinncclluuddee <<ssyyss//ttyyppeess..hh>>

     _u_i_d___t
     ggeettuuiidd(_v_o_i_d);

     _u_i_d___t
     ggeetteeuuiidd(_v_o_i_d);

DDEESSCCRRIIPPTTIIOONN
     The ggeettuuiidd() function returns the real user ID of the calling process.
     The ggeetteeuuiidd() function returns the effective user ID of the calling pro-
     cess.

     The real user ID is that of the user who has invoked the program.  As the
     effective user ID gives the process additional permissions during execu-
     tion of ``_s_e_t_-_u_s_e_r_-_I_D'' mode processes, ggeettuuiidd() is used to determine the
     real-user-id of the calling process.

EERRRROORRSS
     The ggeettuuiidd() and ggeetteeuuiidd() functions are always successful, and no return
     value is reserved to indicate an error.

SSEEEE AALLSSOO
     getgid(2),  setreuid(2)

SSTTAANNDDAARRDDSS
     GGeetteeuuiidd() and ggeettuuiidd() conform to IEEE Std 1003.1-1988 (``POSIX'').

4th Berkeley Distribution        June 4, 1993                                1