I have created a shared memory segment (which size is 64 bytes) using shmget, shmat e.t.c and i want to divide it into 2 areas. One area for input data and one area for output? How can i do that?

Furthermore, When i have to write my input data into the shared memory segment i want to write something like this:

a text messase, an integer, another integer

Which function of c should i use? If i had to write only a text message and read it from another process i would use memcpy, but now i have the text messase and two integers (which i use as flags in my code).