adapt self pipe

1 files changed, 32 insertions, 0 deletions

diff --git a/src/pipe.cc b/src/pipe.cc
new file mode 100644
index 0000000..5baaeae
--- /dev/null
+++ b/src/pipe.cc
@@ -0,0 +1,32 @@
+#include "pipe.h"
+
+#include <unistd.h>
+#include <cstdlib>
+#include <fcntl.h>
+
+#include "error.h"
+
+namespace ov4
+{
+
+void self_pipe_init()
+{
+    int ret = pipe2(self_pipe_fd, O_NONBLOCK);
+    if (ret != 0)
+    {
+        throw T_error(error_code::FAIL_TO_OPEN_PIPE, "Fail to open self pipe");
+    }
+}
+
+/*
+ * write a byte to self pipe
+ * NB: you can ONLY determine that signal handler was called
+ * but CANNOT determine the number of callings, or which signal was called
+ * because when the pipe is full, nothing will be written
+ */
+int self_pipe_write()
+{
+    return write(self_pipe_fd[1], &SELF_PIPE_BYTE, 1);
+}
+
+}
\ No newline at end of file