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U:RDoc::NormalModule[iI" Signal:ET@0o:RDoc::Markup::Document: @parts[o;;[ o: RDoc::Markup::Paragraph;[ 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" signal.c;T:0@omit_headings_from_table_of_contents_below0; 0;0[ [ [ [[I" class;T[[: public[[I" list;TI" signal.c;T[I" signame;T@C[I" trap;T@C[:protected[ [: private[ [I" instance;T[[;[ [;[ [;[ [ [U:RDoc::Context::Section[i 0o;;[ ; 0;0[@7@7cRDoc::TopLevel
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