Hello,

I am writing a authmodule using authlib and am having one problem. The module forks then opens up a pipe between parent/child and the child changes uid to read in a user controlled gdbm file. The parent waits for success or failure. Everything is ok if the auth succeeds, but if it fails the module crashes or exits in

authlib/chain.c line 32

if (!prog || open("/dev/null", O_RDONLY) != 3) authexit(1);

Im sure its my fault , but I don't understand what we are checking here for ? Why open /dev/null and why on fd 3 ?

Thanks,