reason is the error returned by the C run-time library for the failing sigaction() call. If the signal handler is not correctly enabled, the command will continue processing, but certain functions controlled by the failing signal will not function properly. Functions controlled by the signals are:

SIGABND

handler controls error reporting and cleanup functions when an abend occurs. If sigaction fails for SIGABND and an abend occurs, trace information about the abend will be lost and certain resources might not be properly cleaned up.

SIGTERM

handler controls cleanup of resources during termination.

SIGPIPE

handler allows the command to detect when the connection to the command was terminated.

SIGINT

handler controls cleanup of resources when the user requested that the command stop processing and end.