chore: migrate src to solutions

solutions/01_environment/system_calls/syscall.c

@@ -0,0 +1,58 @@
+/**
+ * Copyright 2015 University of Applied Sciences Western Switzerland / Fribourg
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * Module:	MA-CSEL1 - Building Embedded Systems under Linux
+ *
+ * Abstract: 	Introduction to the Embedded Linux Development Environment
+ *
+ * Purpose:	System call demo program 
+ *		call this demo program with 
+ *              # strace ./app_a
+ *
+ * Autĥor:	Daniel Gachet
+ * Date:	28.08.2015
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <errno.h>
+#include <libgen.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int main() 
+{	
+	int temp = 99000;
+	int f = open("/sys/class/thermal/thermal_zone0/temp", O_RDONLY);
+	if (f >= 0) {
+		char val[50] = "";
+		ssize_t r = read (f, val, sizeof(val));
+		close (f);
+		if (r > 0) {
+			temp = atoi(val);
+		}
+	}
+	printf ("current temperature: %d.%02d degree Celcius\n", 
+		temp/1000, (temp/10)%100);
+
+	return 0;
+}
+
+