_EDC_SIG_DFLT
To be compliant with the SUSV3 standard, when _EDC_SIG_DFLT
is set to 1, the
default action of the following signals is abnormal termination of the process with no message
output: SIGALRM, SIGHUP, SIGINT, SIGPIPE, SIGPOLL, SIGPROF, SIGSYS, SIGTERM, SIGUSR1, SIGUSR2, and
SIGVTALRM.