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run_command() returns a single integer specifying either an error code or the exit status of the spawned program. The only way to tell the difference is that the error codes are outside of the allowed range of exit status values. Rather than make each caller implement the test against a magic limit, let's provide a macro. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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