Use sigaction module rather than signal().
[pspp] / modules / sigprocmask
2008-06-21 Eric BlakeUse sigaction module rather than signal().
2008-06-16 Eric BlakeUse raise module consistently.
2007-05-01 Bruno Haiblesigprocmask.h is replaced with <signal.h>.
2006-10-16 Bruno HaibleNew module 'sigprocmask'.