memory « binary « C Data Type Q&A

1. Is it possible to share a C struct in shared memory between apps compiled with different compilers?    stackoverflow.com

I realize that in general the C and C++ standards gives compiler writers a lot of latitude. But in particular it guarantees that POD types like C struct members have to ...

2. C and memory alignment for a binary protocol    stackoverflow.com

I will use this code as an example:

typedef struct __attribute__((aligned(XXX),packed))
{
   uint16_t type;
   uint32_t id_index;
} a_msg;

void write_func(){
   a_mesg mymsg
   mymsg.type = htons(1);
   ...

3. Finding the size of binary data stored in memory    bytes.com

"sajohn"

4. c program binary/image in memory    bytes.com

Hi folks, I want to understand how exactly is an image(compiled c code and loaded into memory) stored in memory. What exactly is a linker script? I work with a lot of c code on a daily basis but I really don't understand : How exactly the sections like "text,bss,data etc." work? What exactly are they? I believe the linker script ...

5. Store binary code in memory then execute it?    daniweb.com

#include #include #include unsigned char mya[] = { 0x50,0x57,0x56,0x52,0xe8, 0x00,0x00,0x00,0x00,0x5e, 0x48,0x81,0xc6,0x24,0x00, 0x00,0x00,0x48,0xc7,0xc0, 0x01,0x00,0x00,0x00,0x48, 0xc7,0xc7,0x01,0x00,0x00, 0x00,0x48,0xc7,0xc2,0x0e, 0x00,0x00,0x00,0x0f,0x05, 0x5a,0x5e,0x5f,0x5a,0xc3, 0x48,0x65,0x6c,0x6c,0x6f, 0x2c,0x20,0x57,0x6f,0x72, 0x6c,0x64,0x21,0x0a,0x00 }; int main(int argc, char**argv) { void *addr = (void*)((unsigned long)mya & ((0UL - 1UL) ^ 0xfff));/*get memory page*/ int ans = mprotect(addr, 1, PROT_READ|PROT_WRITE|PROT_EXEC);/*set page attributes*/ if (ans) { perror("mprotect"); exit(EXIT_FAILURE); } ((void(*)(void))mya)();/*execute array*/ return 0; } ...