is_starting_luid man page on Tru64

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identity(3)							   identity(3)

NAME
       starting_luid,	starting_ruid,	starting_euid,	starting_rgid,	start‐
       ing_egid,   is_starting_luid,	is_starting_ruid,    is_starting_euid,
       is_starting_rgid,	 is_starting_egid,	  set_auth_parameters,
       check_auth_parameters - Get or check user or group IDs (Enhanced	 Secu‐
       rity)

SYNOPSIS
       #include <sys/types.h> #include <sys/security.h> #include <prot.h>

       uid_t starting_luid(
	       void ); uid_t starting_ruid(
	       void ); uid_t starting_euid(
	       void ); uid_t starting_rgid(
	       void ); uid_t starting_egid(
	       void ); int is_starting_luid(
	       uid_t uid ); int is_starting_ruid(
	       uid_t uid ); int is_starting_euid(
	       uid_t uid ); int is_starting_rgid(
	       uid_t gid ); int is_starting_egid(
	       uid_t gid ); void set_auth_parameters(
	       int argc,
	       char *argv[] ); void check_auth_parameters(
	       void );

LIBRARY
       Enhanced Security Library (libsecurity)

PARAMETERS
       Specifies  the  process's  user	ID.  Specifies the process's group ID.
       Specifies the argument count.

DESCRIPTION
       The identity functions provide a way to recall the IDs of a process  at
       the  time  the  program started. They are useful when interrogating the
       invoking environment of a program after any setuid() or setgid()	 calls
       have been made so that the original environment can be captured.

       The starting_luid() function returns the login UID for the process. The
       login UID is the immutable stamp for the process and accurately denotes
       the  account under which the session is being run, regardless of subse‐
       quent setuid() calls.

       The starting_ruid() function returns the real UID for the process as it
       was  set	 in  the  beginning of the program. Similarly, starting_euid()
       returns the effective UID, starting_rgid() returns the  real  GID,  and
       starting_egid()	returns	 the  effective	 GID. These IDs may not be the
       same as those returned by getuid(), geteuid(), getgid(), or  getegid(),
       respectively,  because  intervening  calls  to setuid() or setgid() can
       change them depending on the process's privileges.

       The is_starting_luid() function returns a value of 1 if the argument is
       the  same  as  the login UID at the time when set_auth_parameters() was
       invoked; otherwise, it returns a value  of  0  (zero).  Similarly,  The
       is_starting_ruid()  function  returns  1 if the argument is the same as
       the real UID at the time when set_auth_parameters() was invoked, and  0
       otherwise. The is_starting_euid() function returns 1 if the argument is
       the same as the effective UID at the  time  when	 set_auth_parameters()
       was invoked, and 0 otherwise. The is_starting_rgid() function returns 1
       if the argument	is  the	 same  as  the	real  GID  at  the  time  when
       set_auth_parameters()  was  invoked,  and  0  otherwise.	 The is_start‐
       ing_egid() function returns 1 if the argument is the same as the effec‐
       tive GID at the time when set_auth_parameters() was invoked, and 0 oth‐
       erwise.

       The set_auth_parameters() function is used to retain the IDs for future
       lookup.	It  also tests the kernel to see if the security features have
       been loaded. If not, the program exists	with  an  error	 message.   It
       should  be  called first in a program or there is a chance that it will
       capture an environment different from the  conditions  at  the  program
       start.  The  two arguments are the argument count and vector with which
       the program was called.	The check_auth_parameters() function  verifies
       that  set_auth_parameters()  has	 been  previously invoked. If not, the
       program exits.

NOTES
       Programs must call set_auth_parameters() before	any  other  action  in
       main().	The  program  must  always call set_auth_parameters(argc,argv)
       before doing anything that changes argc or argv; the other functions in
       identity.c  depend  on  this  happening.	 The argc parameter must be at
       least 1.

       Programs using these functions must be compiled with -lsecurity.

SEE ALSO
       Functions: getuid(2), getgid(2), setuid(2), setgid(2)

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