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socket: make all sockets non-blocking

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All networking code in chronyd (NTP server/client, signd client, cmdmon
server) assumes sending a message will not block, but only the signd
client actually checks for a write event and only the NTP server
requests a non-blocking socket. The cmdmon server and NTP client
(if using one socket for all servers) might be blocked.

chronyc doesn't need a non-blocking socket, but it is not expected to
block as it sends only one message at a time.

Prefer dropped messages over blocking in all cases. Remove the
SCK_FLAG_NONBLOCK flag and make all sockets non-blocking.
This commit is contained in:
Miroslav Lichvar
2019-07-23 15:09:24 +02:00
parent d78680912e
commit 4d26cfc92b
3 changed files with 3 additions and 4 deletions
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1
socket.h
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@@ -31,7 +31,6 @@
#include "addressing.h"
/* Flags for opening sockets */
#define SCK_FLAG_NONBLOCK 1
#define SCK_FLAG_BROADCAST 2
#define SCK_FLAG_RX_DEST_ADDR 4
#define SCK_FLAG_ALL_PERMISSIONS 8