setreuid(2)							 setreuid(2)




 NAME
      setreuid - set real and effective user IDs

 SYNOPSIS
      #include <unistd.h>

      int setreuid(uid_t ruid, uid_t euid);

 DESCRIPTION
      The setreuid() function sets the real and effective user IDs of the
      current process to the values specified by the ruid and euid
      arguments. If ruid or euid is -1, the corresponding effective or real
      user ID of the current process is left unchanged.

      A process with appropriate privileges can set either ID to any value.
      An unprivileged process can only set the effective user ID if the euid
      argument is equal to either the real, effective, or saved user ID of
      the process.

      It is unspecified whether a process without appropriate privileges is
      permitted to change the real user ID to match the current real,
      effective or saved user ID of the process.

 RETURN VALUE
      Upon successful completion, 0 is returned. Otherwise, -1 is returned
      and errno is set to indicate the error.

 ERRORS
      The setreuid() function will fail if:

	   [EINVAL]		    The value of the ruid or euid argument
				    is invalid or out-of-range.

	   [EPERM]		    The current process does not have
				    appropriate privileges, and either an
				    attempt was made to change the effective
				    user ID to a value other than the real
				    user ID or the saved set-user-ID or an
				    attempt was made to change the real user
				    ID to a value not permitted by the
				    implementation.

 SEE ALSO
      getuid(2), setuid(2), <unistd.h>.

 CHANGE HISTORY
      First released in Issue 4, Version 2.







 Hewlett-Packard Company	    - 1 -   HP-UX 11i Version 2: August 2003