From ec40022c5082616b0ad59422530ac1270af0507d Mon Sep 17 00:00:00 2001
From: TomatenMarc <marc.feger@uni-duesseldorf.de>
Date: Tue, 22 May 2018 21:56:17 +0200
Subject: [PATCH] Add File Handling Exampler.
---
Open_Close_Read_Write/file_handling.c | 46 +++++++++++++++++++++++++++
1 file changed, 46 insertions(+)
create mode 100644 Open_Close_Read_Write/file_handling.c
diff --git a/Open_Close_Read_Write/file_handling.c b/Open_Close_Read_Write/file_handling.c
new file mode 100644
index 0000000..00056d1
--- /dev/null
+++ b/Open_Close_Read_Write/file_handling.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+
+int main(void){
+
+ int FLAG = O_RDONLY;
+ int file = open("/proc/cpuinfo", FLAG);
+
+ int size = 1000;
+ char *buffer = malloc(size * sizeof(char));
+ if(read(file, buffer, size) == -1){
+ perror("read error");
+ free(buffer);
+ return -1;
+ }
+
+ char var_name[size];
+ char var_value[size];
+ sscanf(buffer, "%*s %*s %*s %s %*s %s", var_name, var_value);
+
+ printf("%s: %s\n", var_name, var_value);
+
+ int FLAG2 = O_WRONLY;
+ int FLAG3 = O_CREAT;
+ int FLAG4 = O_APPEND;
+ int file2 = open("output.txt", FLAG2 | FLAG3 | FLAG4);
+
+ char *msg = "Hallo Welt\n";
+
+
+ if(write(file2, msg, strlen(msg)) == -1){
+ perror("write error");
+ return -1;
+ }
+
+
+ free(buffer);
+ close(file);
+ close(file2);
+ return 0;
+}
--
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