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POPrinting same physical address in a c program
 

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  1. POPrinting same physical address in a c program
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    <p>Is there is a way to print the same physical address in these programs (while using the shared memory concept) rather than printing different logical addresses?</p> <p>The reason for me to print the same physical address :...</p> <p>/*It's optional to read this, since I have provided a lot of information which is not to the core */</p> <p>In my lab, I have two programs: one to store a string in a physical memory via shared memory concept and one to print the same string via accessing the shared memory.</p> <p>Program 1:</p> <pre><code>#include&lt;sys/types.h&gt; #include&lt;string.h&gt; #include&lt;sys/ipc.h&gt; #include&lt;sys/shm.h&gt; #include&lt;stdio.h&gt; main() { key_t key; int shmid; char* addr1; key = ftok("/home/tamil/myc/pws.c",'T'); shmid = shmget(key,128*1024,IPC_CREAT|SHM_R|SHM_W); addr1 = shmat(shmid,0,0); printf("\nIPC SHARED MEMORY"); printf("\n SENDER ADDRESS"); printf("\nTHE ADDRESS IS %p",addr1); printf("\nENTER THE MESSAGE:"); scanf("%s",addr1); printf("\nMESSAGE STORED IN %p IS %s",addr1,addr1); } </code></pre> <p>Program 2:</p> <pre><code>#include&lt;sys/types.h&gt; #include&lt;string.h&gt; #include&lt;sys/ipc.h&gt; #include&lt;sys/shm.h&gt; #include&lt;stdio.h&gt; main() { int shmid; char* addr1; key_t key; key = ftok("/home/tamil/myc/pws.c",'T'); shmid = shmget(key,128*1024,SHM_R|SHM_W); addr1 = shmat(shmid,0,0); printf("\nIPC SHARED MEMORY"); printf("\n SENDER ADDRESS"); printf("\nTHE ADDRESSS IS %p",addr1); printf("\nMESSAGE STORED IN %p IS %s",addr1,addr1); } </code></pre> <p>Output:</p> <pre><code>tamil@ubuntu:~/myc$ cc shmget.c tamil@ubuntu:~/myc$ ./a.out IPC SHARED MEMORY SENDER ADDRESS THE ADDRESS IS 0xb786c000 ENTER THE MESSAGE:helloworld MESSAGE STORED IN 0xb786c000 IS helloworld tamil@ubuntu:~/myc$ cc shmget2.c tamil@ubuntu:~/myc$ ./a.out IPC SHARED MEMORY SENDER ADDRESS THE ADDRESSS IS 0xb7706000 MESSAGE STORED IN 0xb7706000 IS helloworld tamil@ubuntu:~/myc$ </code></pre> <p>Here these programs are printing the 2 different logical address. But (to satisfy the college professor) is there is a way to print the same physical address? Please help..</p>
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    1. UScaveman
    1. USMuthu Ganapathy Nathan
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    1. COUnder most OS, the user programs have no idea what physical memory is :)
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      1. POPrinting same physical address in a c program
      1. USArmen Tsirunyan
    2. CO@Armen Tsirunyan: Sir, so there is no way. Am I right sir?
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      1. POPrinting same physical address in a c program
      1. USMuthu Ganapathy Nathan
    3. CO@Muthu: Yes, sir, yes, you are :)
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      1. POPrinting same physical address in a c program
      1. USArmen Tsirunyan
 

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