setreuid man page on FreeBSD

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

     setreuid — set real and effective user ID's

     Standard C Library (libc, -lc)

     #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.

     If the real user ID is changed (i.e. ruid is not -1) or the effective
     user ID is changed to something other than the real user ID, then the
     saved user ID will be set to the effective user ID.

     The setreuid() system call 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(2)
     system call.

     When setting the real and effective user IDs to the same value, the stan‐
     dard setuid() system call is preferred.

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

     [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.

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

     The setreuid() system call appeared in 4.2BSD.

BSD			       February 8, 2001				   BSD

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