1 files changed, 98 insertions, 0 deletions
diff --git a/isdn.c b/isdn.c
new file mode 100644
index 0000000..fab470a
--- /dev/null
+++ b/isdn.c
@@ -0,0 +1,98 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+#include <linux/isdn.h>
+
+#include "isdn.h"
+#include "filter.h"
+#include "lcd4linux.h"
+
+typedef struct {
+  unsigned long in;
+  unsigned long out;
+} CPS;
+
+
+static int Usage (void)
+{
+  static int fd=0;
+  char buffer[4096], *p;
+  int i, usage;
+
+  if (fd==-1) return 0;
+
+  fd=open ("/dev/isdninfo", O_RDONLY | O_NDELAY);
+  if (fd==-1) {
+    perror ("open(/dev/isdninfo) failed");
+    return 0;
+  }
+  
+  if (read (fd, buffer, sizeof(buffer))==-1) {
+    perror ("read(/dev/isdninfo) failed");
+    fd=-1;
+    return 0;
+  }
+
+  if (close(fd)==-1) {
+    perror ("close(/dev/isdninfo) failed");
+    fd=-1;
+    return 0;
+  }
+
+  p=strstr(buffer, "usage:");
+  if (p==NULL) {
+    fprintf (stderr, "parse(/dev/isdninfo) failed: no usage line\n");
+    fd=-1;
+    return 0;
+  }
+  p+=6;
+
+  usage=0;
+  for (i=0; i<ISDN_MAX_CHANNELS; i++) {
+    usage|=strtol(p, &p, 10);
+  }
+
+  return usage;
+}
+
+int Isdn (int *rx, int *tx)
+{
+  static int fd=-2;
+  CPS cps[ISDN_MAX_CHANNELS];
+  double cps_i, cps_o;
+  int i;
+
+  *rx=0;
+  *tx=0;
+
+  if (fd==-1) return 0;
+  
+  if (fd==-2) {
+    fd = open("/dev/isdninfo", O_RDONLY | O_NDELAY);
+    if (fd==-1) {
+      perror ("open(/dev/isdninfo) failed");
+      return 0;
+    }
+  }
+  if (ioctl(fd, IIOCGETCPS, &cps)) {
+    perror("ioctl(IIOCGETCPS) failed");
+    fd=-1;
+    return 0;
+  }
+  cps_i=0;
+  cps_o=0;
+  for (i=0; i<ISDN_MAX_CHANNELS; i++) {
+    cps_i+=cps[i].in;
+    cps_o+=cps[i].out;
+  }
+
+  *rx=(int)smooth("isdn_rx", 1000, cps_i);
+  *tx=(int)smooth("isdn_tx", 1000, cps_o);
+
+  return Usage();
+}
+