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Re^2: mysterious error of read function in solaris

by david2008 (Scribe)
on Jan 19, 2012 at 15:39 UTC ( #948793=note: print w/replies, xml ) Need Help??


in reply to Re: mysterious error of read function in solaris
in thread mysterious error of read function in solaris

Which variable should i check if read fails?
  • Comment on Re^2: mysterious error of read function in solaris

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Re^3: mysterious error of read function in solaris
by JavaFan (Canon) on Jan 19, 2012 at 15:46 UTC
    Whatever variable you put the return value of read in. From perldoc -f read
    Returns the number of characters actually read, 0 at end of file, or undef if there was an error (in the latter case $! is also set).
    So, you'd do something like:
    my $r; while ($r = read ...) { ... do stuff here ... } die "read failed: $!" unless defined $r;
    I guess since 5.10, you could also write:
    while (read(...) // die "read failed: $!") { ... do stuff here ... }
    but I don't think I would want to recommend that.

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[marto]: the ticketing system does not accept calls via email, nor has it a working API. It's tied into Active Directory for authentication and the Solaris boxes aren't on that domain
[Corion]: The one thing I haven't figured out a solution to is how to get an edge-trigger instead of sending an email every 5 minutes if the usage is above 90%. I want one mail when it goes over 90% but no more emails as long as it stays between 90% and 95%.
[Corion]: marto: Clever! ;)
[Corion]: You can only reach me by pager
[Corion]: Maybe the solution would be to launch a cron job every minute that takes two measurements a minute apart and sends a mail if the usage is below on the first and above threshold on the last measurement
[marto]: that's essentially it :)
[marto]: I think the long term solution would be to have sysadmins that do their job, so I don't have to do everything :P
[marto]: they already have an entire BMC patrol system, which they disabled, because it was sending out spurious messages. So rather than fix the issue, or even find out what it was, they turned it off. No messages, can't be any problems, right?
[Corion]: marto: But having open tickets / incidents increases the pressure on them ;) Of course, likely your contract / SLA specifies an upper limit for the number of incidents :-D
[Corion]: marto: Ow ...

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