setreuid(2) [bsd man page]

SETREUID(2)							System Calls Manual						       SETREUID(2)

NAME

       setreuid - set real and effective user ID's

SYNOPSIS

       setreuid(ruid, euid)
       int ruid, euid;

DESCRIPTION

       The  real  and  effective  user	ID's of the current process are set according to the arguments.  If ruid or euid is -1, the current uid is
       filled in by the system.  Unprivileged users may change the real user ID to the effective user ID and vice-versa; only the  super-user  may
       make other changes.

RETURN VALUE

       Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

       [EPERM]	      The  current  process  is  not the super-user and a change other than changing the effective user-id to the real user-id was
		      specified.

SEE ALSO

       getuid(2), setregid(2), setuid(3)

4th Berkeley Distribution					    May 9, 1985 						       SETREUID(2)

SETREUID(2)						      BSD System Calls Manual						       SETREUID(2)

NAME

     setreuid -- set real and effective user IDs

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <unistd.h>

     int
     setreuid(uid_t ruid, uid_t euid);

DESCRIPTION

     The real and effective user IDs of the current process are set according to the arguments.  If ruid or euid is -1, the current uid is filled
     in by the system.	Unprivileged users may change the real user ID to the effective user ID and vice-versa; only the super-user may make other
     changes.

     The setreuid() function has been used to swap the real and effective user IDs in set-user-ID programs to temporarily relinquish the set-user-
     ID value.	This purpose is now better served by the use of the seteuid() function (see setuid(2)).

     When setting the real and effective user IDs to the same value, the standard setuid() function is preferred.

RETURN VALUES

     The setreuid() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
     cate the error.

ERRORS

     [EPERM]		The current process is not the super-user and a change other than changing the effective user-id to the real user-id was
			specified.

SEE ALSO

     getuid(2), issetugid(2), seteuid(2), setuid(2)

HISTORY

     The setreuid() system call appeared in 4.2BSD.

BSD
								 February 8, 2001							       BSD