userspace/snmpd: create file snmp_mmap with create_map function

This function was in file wrsCurrentTimeGroup.c, but memory maping is also
needed for other groups.

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

userspace/snmpd/Makefile

@@ -27,6 +27,7 @@ SHLIB = wrsSnmp.so
 SOURCES = \
 	init.c \
 	snmp_shmem.c \
+	snmp_mmap.c \
 	wrsScalar.c \
 	wrsStartCntGroup.c \
 	wrsPstatsTable.c \

userspace/snmpd/snmp_mmap.c

+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include "snmp_mmap.h"
+
+/* FIXME: this is copied from wr_date, should be librarized */
+void *create_map(unsigned long address, unsigned long size)
+{
+	unsigned long ps = getpagesize();
+	unsigned long offset, fragment, len;
+	void *mapaddr;
+	int fd;
+
+	fd = open("/dev/mem", O_RDWR | O_SYNC);
+	if (fd < 0)
+		return NULL;
+
+	offset = address & ~(ps - 1);
+	fragment = address & (ps - 1);
+	len = address + size - offset;
+
+	mapaddr = mmap(0, len, PROT_READ | PROT_WRITE,
+		       MAP_SHARED, fd, offset);
+	close(fd);
+	if (mapaddr == MAP_FAILED)
+		return NULL;
+	return mapaddr + fragment;
+}

userspace/snmpd/snmp_mmap.h

+void *create_map(unsigned long address, unsigned long size);

userspace/snmpd/wrsCurrentTimeGroup.c

 #include "wrsSnmp.h"
 #include "wrsCurrentTimeGroup.h"
-
-
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <sys/types.h>
-#include <sys/stat.h>
+#include "snmp_mmap.h"
 
 /* defines for nic-hardware.h */
 #define WR_SWITCH
@@ -23,30 +18,6 @@ static struct pickinfo wrsCurrentTime_pickinfo[] = {
 
 struct wrsCurrentTime_s wrsCurrentTime_s;
 
-/* FIXME: this is copied from wr_date, should be librarized */
-static void *create_map(unsigned long address, unsigned long size)
-{
-	unsigned long ps = getpagesize();
-	unsigned long offset, fragment, len;
-	void *mapaddr;
-	int fd;
-
-	fd = open("/dev/mem", O_RDWR | O_SYNC);
-	if (fd < 0)
-		return NULL;
-
-	offset = address & ~(ps - 1);
-	fragment = address & (ps - 1);
-	len = address + size - offset;
-
-	mapaddr = mmap(0, len, PROT_READ | PROT_WRITE,
-		       MAP_SHARED, fd, offset);
-	close(fd);
-	if (mapaddr == MAP_FAILED)
-		return NULL;
-	return mapaddr + fragment;
-}
-
 time_t wrsCurrentTime_data_fill(void)
 {
 	static time_t time_update;