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getuid(2) [ultrix man page]

getuid(2)							System Calls Manual							 getuid(2)

Name
       getuid, geteuid - get user identity

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

       uid = getuid()
       uid_t uid;

       euid = geteuid()
       uid_t euid;

Description
       The system call returns the real user ID of the current process, the effective user ID.

       The  real  user ID identifies the person who is logged in.  The effective user ID gives the process additional permissions during execution
       of "set-user-ID" mode processes, which use to determine the real-user-id of the process which invoked them.

Environment
   System Five
       Differs from the System V definition in that the return values are of type int, instead of unsigned short.

   POSIX
       When your program is compiled in POSIX mode, the and functions return a value of type uid_t.  The and functions	return	a  value  of  type
       gid_t.

See Also
       getgid(2), setreuid(2)

																	 getuid(2)

Check Out this Related Man Page

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

NAME
getuid, geteuid -- get user identification LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> #include <sys/types.h> uid_t getuid(void); uid_t geteuid(void); DESCRIPTION
The getuid() system call returns the real user ID of the calling process. The geteuid() system call 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() system calls are always successful, and no return value is reserved to indicate an error. SEE ALSO
getgid(2), issetugid(2), setgid(2), setreuid(2), setuid(2) STANDARDS
The geteuid() and getuid() system calls are expected to conform to ISO/IEC 9945-1:1990 (``POSIX.1''). HISTORY
The getuid() and geteuid() functions appeared in Version 7 AT&T UNIX. BSD
June 4, 1993 BSD

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