netbsd man page for geteuid

GETUID(2)						      BSD System Calls Manual							 GETUID(2)

NAME
     getuid, geteuid -- get user identification

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     uid_t
     getuid(void);

     uid_t
     geteuid(void);

DESCRIPTION
     The getuid() function returns the real user ID of the calling process.  The geteuid() function returns the effective user ID of the calling
     process.

     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
     execution of ``set-user-ID'' mode processes, getuid() is used to determine the real-user-id of the calling process.

ERRORS
     The getuid() and geteuid() functions are always successful, and no return value is reserved to indicate an error.

SEE ALSO
     getgid(2), setreuid(2)

STANDARDS
     The geteuid() and getuid() functions conform to ISO/IEC 9945-1:1990 (``POSIX.1'').

HISTORY
     The getuid() function appeared in Version 4 AT&T UNIX.

BSD
								   April 3, 2010							       BSD