1 files changed, 149 insertions, 0 deletions
diff --git a/fitsy/sshare.C b/fitsy/sshare.C
new file mode 100644
index 0000000..f2b94d9
--- /dev/null
+++ b/fitsy/sshare.C
@@ -0,0 +1,149 @@
+// Copyright (C) 1999-2018
+// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
+// For conditions of distribution and use, see copyright notice in "copyright"
+
+#include "sshare.h"
+#include "util.h"
+
+#if (HAVE_SYS_SHM_H && !__WIN32)
+#include <sys/types.h>
+#include <sys/shm.h>
+#include <sys/ipc.h>
+
+FitsSShareID::FitsSShareID(int hdrid, int shmid, const char* filter)
+{
+  // reset
+  valid_ =0;
+
+  {
+    // find size
+    struct shmid_ds info;
+    if (shmctl(hdrid, IPC_STAT, &info)) {
+      internalError("Fitsy++ sshare shctl failed");
+      return;
+    }
+    hmapsize_ = info.shm_segsz;
+
+    // Attach the memory segment
+    if ((long)(hmapdata_ = (char*)shmat(hdrid, 0, SHM_RDONLY)) == -1) {
+      internalError("Fitsy++ sshare shmat failed");
+      return;
+    }
+  }
+
+  {
+    parse(filter);
+    if (!valid_)
+      return;
+
+    // reset
+    valid_ =0;
+
+    // find size
+    struct shmid_ds info;
+    if (shmctl(shmid, IPC_STAT, &info)) {
+      internalError("Fitsy++ sshare shctl failed");
+      return;
+    }
+    mapsize_ = info.shm_segsz;
+
+    // Attach the memory segment
+    if ((long)(mapdata_ = (char*)shmat(shmid, 0, SHM_RDONLY)) == -1) {
+      internalError("Fitsy++ sshare shmat failed");
+      return;
+    }
+  }
+
+  // so far so good
+  valid_ = 1;
+}
+
+FitsSShareID::~FitsSShareID()
+{
+  shmdt(mapdata_);
+}
+
+FitsSShareKey::FitsSShareKey(int hdr, int key, const char* filter)
+{
+  // reset
+  valid_ =0;
+
+  {
+    // get shmid
+    int shmid;
+    if ((shmid = shmget(hdr, 0, 0)) < 0) {
+      internalError("Fitsy++ sshare shmget failed");
+      return;
+    }
+
+    // find size
+    struct shmid_ds info;
+    if (shmctl(shmid, IPC_STAT, &info)) {
+      internalError("Fitsy++ sshare shctl failed");
+      return;
+    }
+    mapsize_ = info.shm_segsz;
+
+    // Attach the memory segment
+    if ((long)(mapdata_ = (char*)shmat(shmid, 0, SHM_RDONLY)) == -1) {
+      internalError("Fitsy++ sshare shmat failed");
+      return;
+    }
+  }
+
+  {
+    parse(filter);
+    if (!valid_)
+      return;
+
+    // reset
+    valid_ =0;
+
+    // get shmid
+    int shmid;
+    if ((shmid = shmget(key, 0, 0)) < 0) {
+      internalError("Fitsy++ sshare shmget failed");
+      return;
+    }
+
+    // find size
+    struct shmid_ds info;
+    if (shmctl(shmid, IPC_STAT, &info)) {
+      internalError("Fitsy++ sshare shmctl failed");
+      return;
+    }
+    mapsize_ = info.shm_segsz;
+
+    // Attach the memory segment
+    if ((long)(mapdata_ = (char*)shmat(shmid, 0, SHM_RDONLY)) == -1) {
+      internalError("Fitsy++ sshare shmat failed");
+      return;
+    }
+  }
+
+  // so far so good
+  valid_ = 1;
+}
+
+FitsSShareKey::~FitsSShareKey()
+{
+  shmdt(mapdata_);
+}
+
+#else
+
+FitsSShareID::FitsSShareID(int hdrid, int shmid, const char* filter)
+{
+  valid_ = 0;
+}
+
+FitsSShareID::~FitsSShareID() {}
+
+FitsSShareKey::FitsSShareKey(int hdr, int key, const char* filter)
+{
+  valid_ = 0;
+}
+
+FitsSShareKey::~FitsSShareKey() {}
+
+#endif