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run_command(): help callers distinguish errors

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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>
This commit is contained in:
Jeff King 2009-01-28 02:36:39 -05:00 committed by Junio C Hamano
parent 45c0961c87
commit 1d64f21d99
1 changed files with 1 additions and 0 deletions
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1
run-command.h
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@ -10,6 +10,7 @@ enum {
ERR_RUN_COMMAND_WAITPID_SIGNAL,
ERR_RUN_COMMAND_WAITPID_NOEXIT,
};
#define IS_RUN_COMMAND_ERR(x) ((x) <= -ERR_RUN_COMMAND_FORK)
struct child_process {
const char **argv;