posix_seteuid Set the effective UID of the current process &reftitle.description; boolposix_seteuid intuser_id Set the effective user ID of the current process. This is a privileged function and needs appropriate privileges (usually root) on the system to be able to perform this function. &reftitle.parameters; user_id The user id. &reftitle.returnvalues; &return.success; &reftitle.seealso; posix_geteuid posix_setuid posix_getuid