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NetBSD 6.1.5 - man page for geteuid (netbsd section 2)

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() func-
     tion 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


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