Es++ Class: SharedMemoryData
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Source code
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* SharedMemoryData.h
*
*****************************************************************************/
#pragma once
#include <es++/Object.h>
#include <es++/Exception.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
/*
struct shmid_ds {
struct ipc_perm shm_perm; // operation perms
int shm_segsz; // size of segment (bytes)
time_t shm_atime; // last attach time
time_t shm_dtime; // last detach time
time_t shm_ctime; // last change time
unsigned short shm_cpid; // pid of creator
unsigned short shm_lpid; // pid of last operator
short shm_nattch; // no. of current attaches
// the following are private
unsigned short shm_npages; // size of segment (pages)
unsigned long *shm_pages; // array of ptrs to frames -> SHMMAX
struct vm_area_struct *attaches; // descriptors for attaches
};
struct ipc_perm {
key_t key;
uid_t uid;
gid_t gid;
uid_t cuid;
gid_t cgid;
unsigned short mode;
unsigned short seq;
};
*/
namespace Es {
class SharedMemoryData :public Object {
private:
shmid_ds ds;
public:
SharedMemoryData()
{
memset(&ds, 0, sizeof(ds));
}
public:
operator shmid_ds*() {
return &ds;
}
public:
shmid_ds* getData() {
return &ds;
}
public:
void display() {
printf("ipc_perm.key = %ud\n", ds.shm_perm.__key);
/*
printf("ipc_perm.uid = %ud\m", ds.shm_perm.uid);
printf("ipc_perm.gid = %ud\m", ds.shm_perm.gid);
printf("ipc_perm.cuid = %ud\m", ds.shm_perm.cuid);
printf("ipc_perm.cgid = %ud\m", ds.shm_perm.cgid);
printf("ipc_perm.mode= %d\m", ds.sem_perm.mode);
printf("ipc_perm.seq= %d\m", ds.sem_perm.__seq);
printf("shm_segsz = %d bytes\n", ds.shm_segsz);
printf("last attach time = %s\n", ctime(ds.shm_atime));
printf("last detach time = %s\n", ctime(ds.shm_dtime));
printf("last change time = %s\n", ctime(ds.shm_ctime));
printf("pid creator = %d\n", ds.shm_cpid);
printf("pid of operator = %d\n", ds.shm_lpid);
printf("no of current attaches = %d\n", ds.shm_nattch);
// the following are private
//unsigned short shm_npages; // size of segment (pages)
//unsigned long *shm_pages;
*/
}
};
}
Last modified: 27 July 2017
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