#3 Fix signal handler

[Markus Elfring]

The functions "sprintf" and "exit" do not belong to the list of async-signal-safe functions.
See section "2.4.3 Signal Actions" from the document "2.4 Signal Concepts".
http://opengroup.org/onlinepubs/009695399/functions/xsh_chap02_04.html#tag_02_04_03
http://opengroup.org/onlinepubs/009695399/functions/_Exit.html

A different program design will be needed for your function "catch_int".

[Nobody/Anonymous]

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Thanks,

Sorry was little busy in something else. Would go through that document.