local socket breaks are not detected

[9nut]

this is an FYI. i tried to investigate it and couldn't find anything obvious; i think this is subtle problem with default Dialer for "unix" sockets. i don't have time to look into it further but thought someone here might want to know about it.

i used godrv for a project which has since been changed to use go-mysql-driver. there was an issue where go routines that access the database in a long running application would get stuck after a few days. the application uses one database connection, which is a unix domain socket. the application is a data logger that gets data from several systems once a day. usually by the third day the stuck condition would appear without any error or warning messages whatsoever. after switching to go-mysql-driver (i.e. switching the package import and the DSN format) i noticed that it is detecting a broken pipe condition during some writes, from which it recovers. I suspect the path that handles the default dialer for unix sockets in mymysql isn't doing the right thing.

sorry for the sketchy problem reporting.