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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"Hprocesses. Some signals have a defined effect on the process, while;TI"@others may be trapped at the code level and acted upon. For;TI"Hexample, 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 ;FI" Signal.trap("USR1") do ;FI" $debug = !$debug ;FI"# puts "Debug now: #$debug" ;FI" end ;FI" Signal.trap("TERM") do ;FI" puts "Terminating..." ;FI" shutdown() ;FI" end ;FI"" # . . . do some work . . . ;FI" end ;FI" ;FI"Process.detach(pid) ;FI" ;FI" # Controlling program: ;FI" Process.kill("USR1", pid) ;FI" # ... ;FI" Process.kill("USR1", pid) ;FI" # ... ;FI" Process.kill("TERM", pid) ;Fo; ;[I"produces:;To; ;[I" Debug now: true ;FI" Debug now: false ;FI"Terminating... ;Fo; ;[I"CThe list of available signal names and their interpretation is;TI"Fsystem 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[ [ [ [[I" class;F[[: public[[I" list;T@7[I" trap;T@7[:protected[ [: private[ [I" instance;F[[; [ [;[ [;[