Make sure ctx being cancelled actually stops system() process #124
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This is an issue with the (grand)child process holding stdout/stderr, so per golang/go#21922 (comment) use a pipe to work around this.
Still has some kind of race condition ... not sure why:
$ go test ./interp -awk='' -run='Interp/system.*echo_foo' -count=1000
--- FAIL: TestInterp (0.01s)
--- FAIL: TestInterp/BEGIN_{_print_system("echo_foo");_print_system("echo_bar")_}__#_!fuzz (0.00s)
interp_test.go:879: expected "foo\n0\nbar\n0\n", got "0\nbar\n0\n"
--- FAIL: TestInterp (0.01s)
--- FAIL: TestInterp/BEGIN_{_print_system("echo_foo");_print_system("echo_bar")_}__#_!fuzz (0.00s)
interp_test.go:879: expected "foo\n0\nbar\n0\n", got "0\nbar\n0\n"
FAIL
FAIL github.com/benhoyt/goawk/interp 5.241s
FAIL
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This is a manifestation of golang/go#21922 - use pipes to fix it. Tricky!
Fixes #122.