Zbigniew Jędrzejewski-Szmek
a75211421f
When running PROGRAM="...", we would log systemd-udevd[447]: Failed to wait spawned command '...': Input/output error no matter why the program actually failed, at error level. The code wouldn't distinguish between an internal failure and a failure in the program being called and run sd_event_exit(..., -EIO) on any kind of error. EIO is rather misleading here, becuase it suggests a serious error. on_spawn_sigchld is updated to set the return code to distinguish failure to spawn, including the program being killed by a signal (a negative return value), and the program failing (positive return value). The logging levels are adjusted, so that for PROGRAM= calls, which are essentially "if" statements, we only log at debug level (unless we get a timeout or segfault or another unexpected error).
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