37 lines
1.2 KiB
Ruby
37 lines
1.2 KiB
Ruby
require 'tempfile'
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# LdPreload is a little wrapper for using LD_PRELOAD when testing flexnbd
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module LdPreload
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# This takes an object name, sets up a temporary log file, whose name is
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# recorded in the environment as OUTPUT_obj_name, where obj_name is the
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# name of the preload module to build and load.
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def with_ld_preload(obj_name)
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@ld_preload_logs ||= {}
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flunk 'Can only load a preload module once!' if @ld_preload_logs[obj_name]
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system("make -C ld_preloads/ #{obj_name}.o > /dev/null") ||
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flunk("Failed to build object #{obj_name}")
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orig_env = ENV['LD_PRELOAD']
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ENV['LD_PRELOAD'] = [orig_env, File.expand_path("./ld_preloads/#{obj_name}.o")].compact.join(' ')
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# Open the log, and stick it in a hash
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@ld_preload_logs[obj_name] = Tempfile.new(obj_name)
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ENV['OUTPUT_' + obj_name] = @ld_preload_logs[obj_name].path
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yield
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ensure
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if @ld_preload_logs[obj_name]
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@ld_preload_logs[obj_name].close
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@ld_preload_logs.delete(obj_name)
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end
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ENV['LD_PRELOAD'] = orig_env
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end
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def read_ld_preload_log(obj_name)
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lines = []
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lines << @ld_preload_logs[obj_name].readline.chomp until
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@ld_preload_logs[obj_name].eof?
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lines
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end
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end
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