1 files changed, 41 insertions, 0 deletions
diff --git a/src/trigger.c b/src/trigger.c
new file mode 100644
index 0000000..ec22e11
--- /dev/null
+++ b/src/trigger.c
@@ -0,0 +1,41 @@
+#include "select.h"
+#include "ndelay.h"
+#include "open.h"
+#include "trigger.h"
+#include "close.h"
+
+static int fd = -1;
+
+void trigger_set() 
+{
+  if (fd != -1) close(fd);
+  fd = open_read("lock/trigger");
+}
+
+void trigger_selprep(int *nfds,fd_set *rfds) 
+{
+  if (fd != -1) {
+    FD_SET(fd,rfds);
+    if (*nfds < fd + 1) *nfds = fd + 1;
+  }
+}
+
+int trigger_pulled(fd_set *rfds) 
+{
+  if (fd != -1) if (FD_ISSET(fd,rfds)) return 1;
+  return 0;
+}
+
+void write();   /* compiler warning (temp) */
+
+void triggerpull() 
+{
+  int fd;
+
+  fd = open_write("lock/trigger");
+  if (fd >= 0) {
+    ndelay_on(fd);
+    write(fd,"",1); /* if it fails, bummer */
+    close(fd);
+  }
+}