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...eturns 0, if the socket had an orderly shutdown. -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 833 bytes Desc: not available URL: <http://alioth-lists.debian.net/pipermail/nut-upsdev/attachments/20230614/7eb96efb/attachment.sig>

So... determining that FD is to be reaped proved hard. Internet lore suggests fcntl() and poll() on the FD, but it just seems valid to them. The errno is also usually not raised (once I saw a "111: Connection refused" though). So the best dumb idea so far is to bail out if we spent the whole loop (128 attempts) and only got zero-sized read replies and no errors.

So... determining that FD is to be reaped proved hard. Internet lore suggests fcntl() and poll() on the FD, but it just seems valid to them. The errno is also usually not raised (once I saw a "111: Connection refused" though). So the best dumb idea so far is to bail out if we spent the whole loop (128 attempts) and only got zero-sized read replies and no errors.

After launching the command several times, with debug (posted by new code in a new branch for the investigation) confirming that the same daemon handles operations from the new client instances, its strace now has numerous FDs to report after select() - so I guess it is a problem of detecting an exit of the counterpart. 0.000000 [D2] parse_at: is 'heartbeat at localhost' in AT

After launching the command several times, with debug (posted by new code in a new branch for the investigation) confirming that the same daemon handles operations from the new client instances, its strace now has numerous FDs to report after select() - so I guess it is a problem of detecting an exit of the counterpart. 0.000000 [D2] parse_at: is 'heartbeat at localhost' in AT