From 8adfff8b2419a0f79e85ba6884e507e787a313da Mon Sep 17 00:00:00 2001
From: Jonathan McCrohan <jmccrohan@gmail.com>
Date: Mon, 24 Oct 2011 01:30:23 +0100
Subject: Timer working. MAC address in string variable.

---
 alarm.c     | 29 +++++++++++++++++++++++++++++
 cpurelax.c  | 16 ++++++++++++++++
 gethwaddr.c | 23 +++++++++++++++++++++++
 modbuslog.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-------
 select.c    | 25 +++++++++++++++++++++++++
 5 files changed, 147 insertions(+), 7 deletions(-)
 create mode 100644 alarm.c
 create mode 100644 cpurelax.c
 create mode 100644 gethwaddr.c
 create mode 100644 select.c

diff --git a/alarm.c b/alarm.c
new file mode 100644
index 0000000..a0bfa35
--- /dev/null
+++ b/alarm.c
@@ -0,0 +1,29 @@
+#include <signal.h>
+#include <stdio.h>
+#include <sys/select.h>
+#include <unistd.h>
+#include <time.h>
+
+volatile unsigned int variable = 0;
+volatile unsigned int print_variable = 0;
+
+void alarm_handler(int signum)
+{
+    alarm(60);
+}
+
+int main()
+{        
+    signal(SIGALRM, alarm_handler);
+    alarm(1);
+
+    for (;;)
+    {
+        select(0, NULL, NULL, NULL, NULL);
+ time_t t = time(NULL);
+ struct tm tm = *localtime(&t);
+ printf("%d-%d-%d %d:%d:%d\n", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
+
+    }
+}
+
diff --git a/cpurelax.c b/cpurelax.c
new file mode 100644
index 0000000..f2eacf0
--- /dev/null
+++ b/cpurelax.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <time.h>
+
+int main(int argc, char *argv[]) {
+
+while(1){
+cpu_relax();
+
+}
+
+ return 0;
+}
diff --git a/gethwaddr.c b/gethwaddr.c
new file mode 100644
index 0000000..2ca2fbb
--- /dev/null
+++ b/gethwaddr.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>    
+#include <sys/socket.h>
+#include <net/if.h>
+#include <string.h>
+
+int main( int argc, char *argv[] )
+{
+    int s;
+    struct ifreq ifr;
+
+    s = socket(PF_INET, SOCK_DGRAM, 0);
+    memset(&ifr, 0x00, sizeof(ifr));
+    strcpy(ifr.ifr_name, "eth0");
+    ioctl(s, SIOCGIFHWADDR, &ifr);
+    close(s);
+
+    unsigned char mac_address[6];
+    sprintf(mac_address,"%.2X%.2X%.2X%.2X%.2X%.2X", (unsigned char) ifr.ifr_hwaddr.sa_data[0], (unsigned char) ifr.ifr_hwaddr.sa_data[1], (unsigned char) ifr.ifr_hwaddr.sa_data[2], (unsigned char) ifr.ifr_hwaddr.sa_data[3], (unsigned char) ifr.ifr_hwaddr.sa_data[4], (unsigned char) ifr.ifr_hwaddr.sa_data[5]);  
+    printf("%s", mac_address);
+
+}
diff --git a/modbuslog.c b/modbuslog.c
index 0649215..ec0acc4 100644
--- a/modbuslog.c
+++ b/modbuslog.c
@@ -24,6 +24,10 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <errno.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/select.h>
+#include <signal.h>
 
 #include <libconfig.h>
 #include <modbus.h>
@@ -33,10 +37,18 @@
 #define NUMBER_REGISTERS 14
 #define DEBUG 1
 
+void minute_check(int signum){
+ alarm(60);
+}
+
+
+
+
+
 int main(int argc, char *argv[])
 {
 
-const char *CONFIG_FILE = "modbuslog.cfg";
+  const char *CONFIG_FILE = "modbuslog.cfg";
 
  config_t cfg;
  //config_setting_t *setting;
@@ -59,18 +71,13 @@ const char *CONFIG_FILE = "modbuslog.cfg";
     return -1;
   }
 
- modbus_t *ctx;
- uint16_t tab_reg[64];
- int rc;
- int i;
-
  if(!(config_lookup_string(&cfg, "modbus.device", &modbus_device_address)
 	&& config_lookup_int(&cfg, "modbus.baud", &modbus_baud_rate)
 	&& config_lookup_int(&cfg, "modbus.data_bits", &modbus_data_bits)
 	&& config_lookup_string(&cfg, "modbus.parity", &modbus_parity)
 	&& config_lookup_int(&cfg, "modbus.stop_bits", &modbus_stop_bits))
 ){
-	fprintf(stderr, "Check modbus configuration in configuration file.\n");
+	fprintf(stderr, "Incomplete modbus configuration. Check configuration file.\n");
 	return -1;
 }
 
@@ -78,6 +85,44 @@ const char *CONFIG_FILE = "modbuslog.cfg";
   printf("%s %d %c %d %d\n",modbus_device_address, modbus_baud_rate, modbus_parity[0], modbus_data_bits, modbus_stop_bits);
  }
 
+
+ modbus_t *ctx;
+ uint16_t tab_reg[64];
+ int rc;
+ int i;
+
+
+ signal(SIGALRM, minute_check);
+ alarm(60);
+
+ for (;;){
+  select(0, NULL, NULL, NULL, NULL);
+
+  time_t t = time(NULL);
+  //int unixtime_min = (((int) t)/60*60);
+  int unixtime = (int) t;
+  printf("%d\n", unixtime);
+  
+  config_setting_t *registers;
+
+  registers = config_lookup(&cfg, "register");
+
+  unsigned int num_registers = config_setting_length(registers);
+
+  int i;
+  for(i = 0; i < num_registers; ++i){
+   config_setting_t *register_element = config_setting_get_elem(registers, i);
+   int slaveid;
+   config_setting_lookup_int(register_element, "slaveid", &slaveid);
+   printf("%d ", slaveid);
+  }
+  printf("\n");
+ }
+}
+
+
+/*
+
 ctx = modbus_new_rtu(modbus_device_address, modbus_baud_rate, modbus_parity[0], modbus_data_bits, modbus_stop_bits);
 
 modbus_set_slave(ctx, SLAVE_ID);
@@ -114,3 +159,5 @@ modbus_free(ctx);
 
     return 0;
 }
+
+*/
diff --git a/select.c b/select.c
new file mode 100644
index 0000000..47351f9
--- /dev/null
+++ b/select.c
@@ -0,0 +1,25 @@
+#include <errno.h>
+#include <stdio.h>
+#include <sys/select.h>
+
+volatile unsigned int variable = 0;
+
+int main()
+{
+    struct timeval tv;
+    int val;
+
+    for (;;)
+    {
+        tv.tv_sec = 1;
+        tv.tv_usec = 0;
+
+        do
+        {
+            val = select(0, NULL, NULL, NULL, &tv);
+        } while (val != 0 && errno == EINTR);
+
+        printf("Variable = %u\n", ++variable);
+    }
+}
+
-- 
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