Current File : //opt/cpanel/ea-ruby24/root/usr/share/ri/system/Signal/cdesc-Signal.ri
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I"@Many operating systems allow signals to be sent to running ;TI"Iprocesses. Some signals have a defined effect on the process, while ;TI"Aothers may be trapped at the code level and acted upon. For ;TI"Iexample, your process may trap the USR1 signal and use it to toggle ;TI"Cdebugging, and may use TERM to initiate a controlled shutdown.;To: RDoc::Markup::BlankLine o:RDoc::Markup::Verbatim;[I"pid = fork do
;TI" Signal.trap("USR1") do
;TI" $debug = !$debug
;TI"# puts "Debug now: #$debug"
;TI" end
;TI" Signal.trap("TERM") do
;TI" puts "Terminating..."
;TI" shutdown()
;TI" end
;TI"" # . . . do some work . . .
;TI" end
;TI"
;TI"Process.detach(pid)
;TI"
;TI" # Controlling program:
;TI" Process.kill("USR1", pid)
;TI" # ...
;TI" Process.kill("USR1", pid)
;TI" # ...
;TI" Process.kill("TERM", pid)
;T: @format0o; ;[I"produces:;To; ;[I" Debug now: true
;TI" Debug now: false
;TI"Terminating...
;T; 0o; ;[I"DThe list of available signal names and their interpretation is ;TI"Gsystem dependent. Signal delivery semantics may also vary between ;TI"Gsystems; in particular signal delivery may not always be reliable.;T:
@fileI"
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