HGKeeper

Add retain basic implementation on GNU/Linux

2018-06-07, Andrey Skvortsov

976841968d74

Add retain basic implementation on GNU/Linux

Retain is saved in file and backup of this file is done every time.
File isn't saved on every PLC cycle to avoid high I/O load.
By default, retain is saved every second and on PLC stop/shutdown.
It's possible to override retain flush period by using CFLAGS option
in project's settings. For example, for 0.5 seconds period
use "-DFILE_RETAIN_SAVE_PERIOD_S=0.5".

BEREMIZ_OBJS = $(BEREMIZSRC:.c=.o)

all: warn some_binary

@echo "*** all done ***"

warn:

@echo "*** Sample Makefile, does nothing ***"

some_binary: $(BEREMIZ_OBJS)

@echo "* Would link $^ -> $@"

%.o: %.c

@echo "* Would compile $< -> $@"

beremiz