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Full Discussion: bash dropping SIGHUPs
Top Forums Shell Programming and Scripting bash dropping SIGHUPs Post 302548448 by cambridge on Thursday 18th of August 2011 11:50:40 AM
Old 08-18-2011
bash dropping SIGHUPs

I've written a daemon in bash, that waits for a HUP signal and then does some processing, before waiting for the next HUP. It goes something like this:
Code:
trap gothup=1 HUP
while :; do
    gothup=0

    # do some processing ...

    # now wait for a HUP ...
    while [ $gothup -eq 0 ]; do
        sleep 30 &
        wpid=$!

        if [ $gothup -eq 0 ]; then
            wait $wpid
            [ $? -lt 128 ] && continue
        fi

        # kill $wpid if still running ...

    done
done

I couldn't figure out a way to get bash to store up signals during a critical piece of code. The above was the best I could get, but my concern is, what if I receive a HUP *after* this test:
Code:
        if [ $gothup -eq 0 ]; then

but before the next instruction:
Code:
            wait $wpid

In that scenario, the wait will block for 30 seconds or until another HUP is received, i.e. it would have missed one HUP.

How can I improve this so there's no chance of missing a HUP?

Thanks,
Mark.
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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