1 files changed, 103 insertions, 0 deletions
diff --git a/fitsy++/share.C b/fitsy++/share.C
new file mode 100644
index 0000000..ca02cb6
--- /dev/null
+++ b/fitsy++/share.C
@@ -0,0 +1,103 @@
+// Copyright (C) 1999-2018
+// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
+// For conditions of distribution and use, see copyright notice in "copyright"
+
+#include "share.h"
+#include "util.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