Can someone help me fix my C program so it outputs the correct sample output.

I am suppose to create 4 processes. Each of these processes will share a variable called "total". Each will increment the variable total by one to 100,000, 200,000, 300,000 and 500,000 respectively.

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Sample Output: From Process 1: counter = 270547. From Process 2: counter = 347860. From Process 3: counter = 400001. From Process 4: counter = 500000.

C Program Code: #include #include #include #include #include #include #include

#define SHMKEY ((key_t) 1497)

// Shared Memory typedef struct { int value; } shared_mem;

shared_mem *total;

/*----------------------------------------------------------------------* * This function increases the value of shared variable "total" * by one with target of 100000 *----------------------------------------------------------------------*/ void process1 () { int k = 0;

while (k < 100000) { total->value = total->value + 1; k++; }

printf ("From process1 total = %d ", total->value); }

/*----------------------------------------------------------------------* * This function increases the value of shared memory variable "total" * by one with a target 200000 *----------------------------------------------------------------------*/

void process2 () { int k = 0;

while (k < 200000) { total->value = total->value + 1; k++; }

printf ("From process1 total = %d ", total->value); }

/*----------------------------------------------------------------------* * This function increases the value of shared memory variable "total" * by one with a target 300000 *----------------------------------------------------------------------*/ void process3 () { int k = 0;

while (k < 300000) { total->value = total->value + 1; k++; }

printf ("From process1 total = %d ", total->value); }

/*----------------------------------------------------------------------* * This function increases the vakue of shared memory variable "total" * by one with a target 500000. *----------------------------------------------------------------------*/ void process4 () { int k = 0;

while (k < 500000) { total->value = total->value + 1; k++; }

printf ("From process4 total = %d ", total->value); }

/*----------------------------------------------------------------------* * MAIN() *----------------------------------------------------------------------*/ int main() { int shmid; int pid1; int pid2; int pid3; int pid4; int ID; int status;

char *shmadd; shmadd = (char *) 0;

/* Create and connect to a shared memory segment*/ if ((shmid = shmget (SHMKEY, sizeof(int), IPC_CREAT | 0666)) < 0) { perror ("shmget"); exit (1); }

if ((total = (shared_mem *) shmat (shmid, shmadd, 0)) == (shared_mem *) -1) { perror ("shmat"); exit (0); }

// Initialize shared memory to 0 total->value = 0;

/* Create 4 processes */ if ((pid1 = fork()) == 0) process1();

if ((pid1 != 0) && (pid2 = fork()) == 0) process2();

if ((pid1 != 0 ) && (pid2 != 0) && (pid3 = fork()) == 0 ) process3();

if ((pid1 != 0 ) && (pid2 != 0) && (pid3 != 0) && (pid4 = fork()) == 0 ) process4();

/* Parent wait for child processes to finish */ waitpid(pid1, NULL, 0 ); waitpid(pid2, NULL, 0 ); waitpid(pid3, NULL, 0 ); waitpid(pid4, NULL, 0 );

if ((pid1 != 0) && (pid2 != 0) && (pid3 != 0) && (pid4 != 0)) { waitpid(pid1); printf("Child with ID %d has just exited. ", pid1);

waitpid(pid2); printf("Child with ID %d has just exited. ", pid2);

waitpid(pid3); printf("Child with ID %d has just exited. ", pid3);

waitpid(pid4); printf("Child with ID %d has just exited. ", pid4);

// To detach a shared memory if (shmdt(total) == -1) { perror ("shmdt"); exit (-1); }

// Remove a shared memory shmctl(shmid, IPC_RMID, NULL);

printf ("\t\t End of Program ");

}

}