1 files changed, 84 insertions, 0 deletions
diff --git a/fitsy++/shmload.C b/fitsy++/shmload.C
new file mode 100644
index 0000000..911bafd
--- /dev/null
+++ b/fitsy++/shmload.C
@@ -0,0 +1,84 @@
+// Copyright (C) 1999-2018
+// Smithsonian Astrophysical Observatory, Cambridge, MA, USA
+// For conditions of distribution and use, see copyright notice in "copyright"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+
+#include <iostream>
+#include <fstream>
+using namespace std;
+
+main(int argc, char* argv[])
+{
+  int q=0;
+
+  // check for args
+  if (argc != 2 && argc != 3){
+    cerr << "usage: shmload [-q] fits" << endl;
+    exit(1);
+  }
+
+  if (!strncmp(argv[1],"-q",2))
+    q=1;
+
+  // find the file
+  char* fn = argv[1+q];
+  struct stat statb;
+  if (stat(fn, &statb) < 0){
+    cerr << "can't find file: " << fn << endl;
+    exit(1);
+  }
+  size_t fnsize = statb.st_size;
+  if (!q)
+    cerr << fn << " size " << fnsize << endl;
+
+  // calculate shmsize
+  size_t shmsize = ((fnsize/2880)+1)*2880;
+
+  // get shmid
+  int shmid = shmget(IPC_PRIVATE, shmsize, IPC_CREAT|0666);
+
+  if (shmid == -1) {
+    // give up, its bad
+    perror("shmid is bad");
+    exit(1);
+  }
+  if (!q)
+    cerr << "shmid " << shmid << endl;
+  else
+    cout << shmid << endl;
+
+  // get shm stats
+  struct shmid_ds sbuf;
+  if (shmctl(shmid, IPC_STAT, &sbuf)<0) {
+    perror("shmctl is bad");
+    exit(1);
+  }
+  if (!q)
+    cerr << "size of shared segment: " << sbuf.shm_segsz << endl;
+
+  char* addr = (char*)shmat(shmid, NULL, 0);
+  //  if (addr == -1){
+  //    perror("shmat failed");
+  //    exit(1);
+  //  }
+
+  // load image
+  ifstream fd(fn);
+  fd.read(addr,fnsize);
+  if (!q) {
+    cerr << fd.gcount() << " bytes read" << endl;
+    if (fd.gcount() != fnsize)
+      cerr << "File read error" << endl;
+    else 
+      cerr << "success!" << endl;
+  }
+}
+