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Merge pull request #62 from sgh/master 

Set low-latency flag on serial port.

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pull/63/head
Oliver Hartkopp 2018-01-14 14:46:36 +01:00 committed by GitHub
parent cf949a926a d052ad1a6b
commit 6bbcf9d90c
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1 changed files with 8 additions and 0 deletions
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slcand.c
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@ -39,6 +39,7 @@
#include <termios.h> #include <termios.h>
#include <linux/tty.h> #include <linux/tty.h>
#include <linux/sockios.h> #include <linux/sockios.h>
#include <linux/serial.h>
#include <stdarg.h> #include <stdarg.h>
/* Change this to whatever your daemon is called */ /* Change this to whatever your daemon is called */
@ -310,6 +311,13 @@ int main(int argc, char *argv[])
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
// Because of a recent change in linux - https://patchwork.kernel.org/patch/9589541/
// we need to set low latency flag to get proper receive latency
struct serial_struct snew;
ioctl (fd, TIOCGSERIAL, &snew);
snew.flags |= ASYNC_LOW_LATENCY;
ioctl (fd, TIOCSSERIAL, &snew);
/* Get old values for later restore */ /* Get old values for later restore */
old_ispeed = cfgetispeed(&tios); old_ispeed = cfgetispeed(&tios);
old_ospeed = cfgetospeed(&tios); old_ospeed = cfgetospeed(&tios);