SETREUID man page on 4.4BSD

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

     setreuid — set real and effective user ID's

     #include <unistd.h>

     setreuid(uid_t ruid, uid_t euid);

     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 effec‐
     tive 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 stan‐
     dard setuid() function is preferred.

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

     [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

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

     The setreuid function call appeared in 4.2BSD and was dropped in 4.4BSD.

4th Berkeley Distribution	April 16, 1994	     4th Berkeley Distribution

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