Use perror or strerror.

Also Line error, 25: warning: cast from pointer to integer of different size

Please help.

code:

#include

#include

#include

#include

#include

void main(int argc, char *argv[])

{

int shmid;

int *total;

pid_t pid;

int status;

int flag;

int n;

shmid = shmget(IPC_PRIVATE, sizeof(int), IPC_CREAT | 0666);

if (shmid < 0)

{

printf("shmget error (server) ");

exit(1);

}

total = (int *) shmat(shmid, NULL, 0);

if ((int) total == -1)

{

printf("shmat error (server) ");

exit(1);

}

*total = 0;

printf("Parent:My pid is %d; now spawning a child after setting the shared memory to 0 ",getpid());

pid = fork();

if (pid < 0)

{

printf("*** fork error (server) *** ");

exit(1);

}

else if (pid == 0)

{

flag = 1;

printf("Child:My pid is %d; my parent's id is %d; the shared integer value is currently 0; I will spin untill it's not 0 ",getpid(),getppid());

while(flag == 1)

{

sleep(1);

//printf("I am alive ");

if (*total > 0 )

{

printf("Child:The value in the shared integer is now %d. I will set it back to 0 ",*total);

sleep(1);

*total = 0;

flag = 0;

}

}

printf("Child:Child process terminating ");

exit(0);

}

else

{

sleep(1);

printf("Parent:My pid is %d; spawned a child with pid %d. Please enter an integer to be stored in shared memory ",getpid(),pid);

scanf("%d",&n);

*total = n;

while( wait(NULL) > 0 )

{

if (*total == 0)

{

printf("Parent: the child has rezeroed our shared integer ");

}

sleep(1);

}

shmdt((void *) total);

printf("Parent:Child terminated.parent successfully removed segment whose id is %d ",shmid);

shmctl(shmid, IPC_RMID, NULL);

exit(0);

}

}