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// Copyright (C) 1999-2018
// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
// For conditions of distribution and use, see copyright notice in "copyright"
#include "share.h"
#if (HAVE_SYS_SHM_H && !__WIN32)
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/ipc.h>
FitsShareID::FitsShareID(int shmid, const char* filter)
{
parse(filter);
if (!valid_)
return;
// reset
valid_ =0;
// find size
struct shmid_ds info;
if (shmctl(shmid, IPC_STAT, &info)) {
internalError("Fitsy++ share shctl failed");
return;
}
mapsize_ = info.shm_segsz;
// Attach the memory segment
if ((long)(mapdata_ = (char*)shmat(shmid, 0, SHM_RDONLY)) == -1) {
internalError("Fitsy++ share shctl failed");
return;
}
// so far, so good
valid_ = 1;
}
FitsShareID::~FitsShareID()
{
shmdt(mapdata_);
}
FitsShareKey::FitsShareKey(int key, const char* filter)
{
parse(filter);
if (!valid_)
return;
// reset
valid_ =0;
// get shmid
int shmid;
if ((shmid = shmget(key, 0, 0)) < 0) {
internalError("Fitsy++ share shmget failed");
return;
}
// find size
struct shmid_ds info;
if (shmctl(shmid, IPC_STAT, &info)) {
internalError("Fitsy++ share shctl failed");
return;
}
mapsize_ = info.shm_segsz;
// Attach the memory segment
if ((long)(mapdata_ = (char*)shmat(shmid, 0, SHM_RDONLY)) == -1) {
internalError("Fitsy++ share shmat failed");
return;
}
// so far, so good
valid_ = 1;
}
FitsShareKey::~FitsShareKey()
{
if (mapdata_)
shmdt(mapdata_);
}
#else
FitsShareID::FitsShareID(int shmid, const char* filter)
{
// shared memory not supported
valid_ = 0;
}
FitsShareID::~FitsShareID() {}
FitsShareKey::FitsShareKey(int key, const char* filter)
{
// shared memory not supported
valid_ = 0;
}
FitsShareKey::~FitsShareKey() {}
#endif
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