b1647dbcb7
When sending client requests to a close and fast server, it is possible that a response will be received before the HW transmit timestamp of the request itself. To avoid processing of the response without the HW timestamp, monitor events returned by select() and suspend reading of packets from the receive queue for up to 200 microseconds. As the requests are normally separated by at least 200 milliseconds, it is sufficient to monitor and suspend one socket at a time.
45 lines
1.7 KiB
C
45 lines
1.7 KiB
C
/*
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chronyd/chronyc - Programs for keeping computer clocks accurate.
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**********************************************************************
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* Copyright (C) Miroslav Lichvar 2016
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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**********************************************************************
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=======================================================================
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This is the header file for the Linux-specific NTP socket I/O bits.
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*/
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#ifndef GOT_NTP_IO_LINUX_H
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#define GOT_NTP_IO_LINUX_H
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extern void NIO_Linux_Initialise(void);
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extern void NIO_Linux_Finalise(void);
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extern int NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events);
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extern int NIO_Linux_ProcessEvent(int sock_fd, int event);
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extern int NIO_Linux_ProcessMessage(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
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NTP_Local_Timestamp *local_ts, struct msghdr *hdr, int length);
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extern int NIO_Linux_RequestTxTimestamp(struct msghdr *msg, int cmsglen, int sock_fd);
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extern void NIO_Linux_NotifySocketClosing(int sock_fd);
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#endif
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