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require "fcntl"
require "socket"
module Utils
def self.safe_fork(&_block)
Dir.mktmpdir("homebrew", HOMEBREW_TEMP) do |tmpdir|
UNIXServer.open("#{tmpdir}/socket") do |server|
read, write = IO.pipe
pid = fork do
begin
ENV["HOMEBREW_ERROR_PIPE"] = server.path
server.close
read.close
write.fcntl(Fcntl::F_SETFD, Fcntl::FD_CLOEXEC)
yield
rescue Exception => e
Marshal.dump(e, write)
write.close
exit!
else
exit!(true)
end
end
ignore_interrupts(:quietly) do # the child will receive the interrupt and marshal it back
begin
socket = server.accept_nonblock
rescue Errno::EAGAIN, Errno::EWOULDBLOCK, Errno::ECONNABORTED, Errno::EPROTO, Errno::EINTR
retry unless Process.waitpid(pid, Process::WNOHANG)
else
socket.send_io(write)
socket.close
end
write.close
data = read.read
read.close
Process.wait(pid) unless socket.nil?
raise Marshal.load(data) unless data.nil? || data.empty?
raise Interrupt if $CHILD_STATUS.exitstatus == 130
raise "Suspicious failure" unless $CHILD_STATUS.success?
end
end
end
end
end
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