Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc / deps / grpc / src / core / lib / iomgr / wakeup_fd_pipe.cc

diff --git a/legacy-libs/grpc/deps/grpc/src/core/lib/iomgr/wakeup_fd_pipe.cc b/legacy-libs/grpc/deps/grpc/src/core/lib/iomgr/wakeup_fd_pipe.cc
new file mode 100644 (file)
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+++ b/legacy-libs/grpc/deps/grpc/src/core/lib/iomgr/wakeup_fd_pipe.cc
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+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/lib/iomgr/port.h"
+
+#ifdef GRPC_POSIX_WAKEUP_FD
+
+#include "src/core/lib/iomgr/wakeup_fd_pipe.h"
+#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 grpc_error* pipe_init(grpc_wakeup_fd* fd_info) {
+  int pipefd[2];
+  int r = pipe(pipefd);
+  if (0 != r) {
+    gpr_log(GPR_ERROR, "pipe creation failed (%d): %s", errno, strerror(errno));
+    return GRPC_OS_ERROR(errno, "pipe");
+  }
+  grpc_error* err;
+  err = grpc_set_socket_nonblocking(pipefd[0], 1);
+  if (err != GRPC_ERROR_NONE) return err;
+  err = grpc_set_socket_nonblocking(pipefd[1], 1);
+  if (err != GRPC_ERROR_NONE) return err;
+  fd_info->read_fd = pipefd[0];
+  fd_info->write_fd = pipefd[1];
+  return GRPC_ERROR_NONE;
+}
+
+static grpc_error* 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 GRPC_ERROR_NONE;
+    switch (errno) {
+      case EAGAIN:
+        return GRPC_ERROR_NONE;
+      case EINTR:
+        continue;
+      default:
+        return GRPC_OS_ERROR(errno, "read");
+    }
+  }
+}
+
+static grpc_error* pipe_wakeup(grpc_wakeup_fd* fd_info) {
+  char c = 0;
+  while (write(fd_info->write_fd, &c, 1) != 1 && errno == EINTR)
+    ;
+  return GRPC_ERROR_NONE;
+}
+
+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) {
+  grpc_wakeup_fd fd;
+  fd.read_fd = fd.write_fd = -1;
+
+  if (pipe_init(&fd) == GRPC_ERROR_NONE) {
+    pipe_destroy(&fd);
+    return 1;
+  } else {
+    return 0;
+  }
+}
+
+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 */