CGI permissions for targeted policy

[Ben]

I have been having some problems with a CGI program, and audit2allow 
shows I should add these permissions:

allow httpd_sys_script_t devpts_t:chr_file { read write };
allow httpd_sys_script_t httpd_tmp_t:file getattr;
allow httpd_sys_script_t httpd_tmp_t:file read;

I'm pretty green at SELinux, so I'm not too sure what these allow. I 
suspect that the last rule lets httpd_sys_script_t programs read files 
of type httpd_tmp_t, and the second rule lets them stat() those files. 
What does the first rule mean, exactly? The CGI program I'm trying to 
run creates a random filename, and I expect this is related to that, 
but there ends my speculation.