24 lines
526 B
Ruby
24 lines
526 B
Ruby
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#!/usr/bin/env ruby
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# typed: strict
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# frozen_string_literal: true
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require "fiddle"
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libproc = Fiddle.dlopen("/usr/lib/libproc.dylib")
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proc_pidpath = Fiddle::Function.new(
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libproc["proc_pidpath"],
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[Fiddle::TYPE_INT, Fiddle::TYPE_VOIDP, Fiddle::TYPE_UINT32_T],
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Fiddle::TYPE_INT,
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)
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pid = ARGV[0]&.to_i
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exit 1 unless pid
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bufsize = 4 * 1024 # PROC_PIDPATHINFO_MAXSIZE = 4 * MAXPATHLEN
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buf = "\0" * bufsize
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ptr = Fiddle::Pointer.to_ptr(buf)
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ret = proc_pidpath.call(pid, ptr, bufsize)
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puts ptr.to_s.strip if ret.positive?
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