UNIX Socket FAQ

lvasilis22

Member

Registered: 2008-11-17

Posts: 8

Re: write into shared memory segment

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).

jfriesne

Administrator

From: California

Registered: 2005-07-06

Posts: 348

Website

Re: write into shared memory segment

struct myStruct {
   char textMessage[16];
   int int1;
   int int2;
};
struct myStruct tmp;
strcpy(&tmp.textMessage, "hello");
tmp.int1 = 5;
tmp.int2 = 15;
memcpy(sharedMemoryArea, &tmp, sizeof(tmp));

Rafael

Guest

Re: write into shared memory segment

Jeremy, i know it's 9 years later but your response perfectly fit what I was looking for. Thanks!