1 files changed, 102 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/wakeup_fd_pipe.c b/src/core/lib/iomgr/wakeup_fd_pipe.c
new file mode 100644
index 0000000000..e9b9a0119f
--- /dev/null
+++ b/src/core/lib/iomgr/wakeup_fd_pipe.c
@@ -0,0 +1,102 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_POSIX_WAKEUP_FD
+
+#include "src/core/lib/iomgr/wakeup_fd_posix.h"
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <grpc/support/log.h>
+
+#include "src/core/lib/iomgr/socket_utils_posix.h"
+
+static void pipe_init(grpc_wakeup_fd* fd_info) {
+  int pipefd[2];
+  /* TODO(klempner): Make this nonfatal */
+  int r = pipe(pipefd);
+  if (0 != r) {
+    gpr_log(GPR_ERROR, "pipe creation failed (%d): %s", errno, strerror(errno));
+    abort();
+  }
+  GPR_ASSERT(grpc_set_socket_nonblocking(pipefd[0], 1));
+  GPR_ASSERT(grpc_set_socket_nonblocking(pipefd[1], 1));
+  fd_info->read_fd = pipefd[0];
+  fd_info->write_fd = pipefd[1];
+}
+
+static void pipe_consume(grpc_wakeup_fd* fd_info) {
+  char buf[128];
+  ssize_t r;
+
+  for (;;) {
+    r = read(fd_info->read_fd, buf, sizeof(buf));
+    if (r > 0) continue;
+    if (r == 0) return;
+    switch (errno) {
+      case EAGAIN:
+        return;
+      case EINTR:
+        continue;
+      default:
+        gpr_log(GPR_ERROR, "error reading pipe: %s", strerror(errno));
+        return;
+    }
+  }
+}
+
+static void pipe_wakeup(grpc_wakeup_fd* fd_info) {
+  char c = 0;
+  while (write(fd_info->write_fd, &c, 1) != 1 && errno == EINTR)
+    ;
+}
+
+static void pipe_destroy(grpc_wakeup_fd* fd_info) {
+  if (fd_info->read_fd != 0) close(fd_info->read_fd);
+  if (fd_info->write_fd != 0) close(fd_info->write_fd);
+}
+
+static int pipe_check_availability(void) {
+  /* Assume that pipes are always available. */
+  return 1;
+}
+
+const grpc_wakeup_fd_vtable grpc_pipe_wakeup_fd_vtable = {
+    pipe_init, pipe_consume, pipe_wakeup, pipe_destroy,
+    pipe_check_availability};
+
+#endif /* GPR_POSIX_WAKUP_FD */