int main(int argc, char *argv[])
{
char write_buf[BUF_MAX];
char read_buf[BUF_MAX];
memset(write_buf, 0, sizeof(write_buf));
memset(read_buf, 0, sizeof(read_buf));
if (share_mem_init(0x36f9) < 0) {
printf("err init.\n");
return -1;
}
int i = 0;
for (i = 0; i < BUF_MAX; i++) {
write_buf[i] = i;
}
share_mem_write(100, write_buf, BUF_MAX);
share_mem_read(100, read_buf, BUF_MAX);
for (i = 0; i < BUF_MAX; i++) {
printf("%4x ", read_buf[i]);
if (i % 10 == 0) {
printf("\n");
}
}
printf("\n");
return 0;
}
int main()
{
int fd[2];
pid_t pid;
char buff[255];
int len;
//create pipe
pipe(fd);
//create a child
pid = fork();
//child forking
if (-1 == pid)
{
// indicates the fork was unsuccessful
perror("cannot fork\n");
exit(1);
}
else if (0 == pid)
{
//child
//close unwanted end
close(fd[1]);
//read the data from fd
read(fd[0], &len, sizeof(len));
read(fd[0], buff, len);
printf("\nString: %s\n", buff);
//reverse string
reverse_str(buff, strlen(buff));
printf("Reversed String: %s\n", buff);
//write reversed string to shared memory
share_mem_write(buff);
}
else
{
//parent
//enter the string that you want to save
printf("Enter the string: ");
fgets(buff, 255, stdin);
//strcpy(buff, "Hello");
len = strlen(buff);
len++; //to account for null
//close unwanted fd
close(fd[0]);
//write the data into this fd
write(fd[1], &len, sizeof(len));
write(fd[1], buff, len);
sleep(5);
//read from shared memory
share_mem_read(buff);
printf("String: %s\n", buff);
}
}