Signal handling in PAM

[Doug Fajardo]

I am writing a PAM module that needs to spawn a child, and eventually reap
the child when it terminates.

Are there any conventions, restrictions or limits on setting a SIGCHLD
handler (or any signal handler) within a PAM module? How does one prevent
another pam module (that also spawns a child...) from interfering with
another?  I haven't been able to find any documentation on this subject -
any input would be appreciated.

Thanks!
  Doug Fajardo