From 2e77c76192362d2e39c249d22e7381c3dfa690b3 Mon Sep 17 00:00:00 2001
From: Elaiyavan-k <ellaiyavan2006@gmail.com>
Date: Tue, 27 May 2025 09:08:58 +0530
Subject: [PATCH] Update README.md

---
 README.md | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 66 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index d38d99b..5f3d1dc 100644
--- a/README.md
+++ b/README.md
@@ -21,19 +21,81 @@ Execute the C Program for the desired output.
 
 ## 1.To Write a C program that illustrates files copying 
 
+```
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdlib.h>
+int main()
+{
+    char block[1024];
+    int in, out;
+    int nread;
+    in = open("filecopy.c", O_RDONLY);
+    out = open("file.out", O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR);
+    while((nread = read(in,block,sizeof(block))) > 0)
+    write(out,block,nread);
+    exit(0);}
+```
 
+## 2.To Write a C program that illustrates files locking
 
+```
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/file.h>
+int main (int argc, char* argv[])
+{
+    char* file = argv[1];
+    int fd;
+    struct flock lock;
+    printf ("opening %s\n", file);
+    fd = open (file, O_WRONLY);
+    if (flock(fd, LOCK_SH) == -1)
+    {
+        printf("error");
+    }
+    else
+    {
+        printf("Acquiring shared lock using flock");
+    }
+    getchar();
+    if (flock(fd, LOCK_EX | LOCK_NB) == -1)
+    {
+        printf("error");
+    }
+    else
+    {
+        printf("Acquiring exclusive lock using flock");
+    }
+    getchar();
+    if (flock(fd, LOCK_UN) == -1)
+    {
+        printf("error");
+    }
+    else
+    {
+        printf("unlocking");
+    }
+    getchar();
+    close (fd);
+    return 0;
+}
+```
 
 
 
+## OUTPUT
 
-## 2.To Write a C program that illustrates files locking
-
-
+### 01
 
+![image](https://github.com/Priyanghaofficial/Linux-File-IO-Systems-locking/assets/147121154/a14ff10d-b16b-4403-ab3a-639485382e02)
 
-## OUTPUT
+### 02
 
+![image](https://github.com/Priyanghaofficial/Linux-File-IO-Systems-locking/assets/147121154/6a9674ab-333d-4bb8-be25-8f3e8bef5530)