emulator: Add <hardware/qemu_pipe.h> header
This header is required by our GLES emulation guest code to be able
to access the emulator services provided through the /dev/qemu_pipe
special device.
Change-Id: Ia9782256048d7340237f3e1d18d7452dd815e561
diff --git a/include/hardware/qemu_pipe.h b/include/hardware/qemu_pipe.h
new file mode 100644
index 0000000..1a67022
--- /dev/null
+++ b/include/hardware/qemu_pipe.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * 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.
+ */
+#ifndef ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
+#define ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
+
+#include <sys/cdefs.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <pthread.h> /* for pthread_once() */
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+
+#ifndef D
+# define D(...) do{}while(0)
+#endif
+
+/* Try to open a new Qemu fast-pipe. This function returns a file descriptor
+ * that can be used to communicate with a named service managed by the
+ * emulator.
+ *
+ * This file descriptor can be used as a standard pipe/socket descriptor.
+ *
+ * 'pipeName' is the name of the emulator service you want to connect to.
+ * E.g. 'opengles' or 'camera'.
+ *
+ * On success, return a valid file descriptor
+ * Returns -1 on error, and errno gives the error code, e.g.:
+ *
+ * EINVAL -> unknown/unsupported pipeName
+ * ENOSYS -> fast pipes not available in this system.
+ *
+ * ENOSYS should never happen, except if you're trying to run within a
+ * misconfigured emulator.
+ *
+ * You should be able to open several pipes to the same pipe service,
+ * except for a few special cases (e.g. GSM modem), where EBUSY will be
+ * returned if more than one client tries to connect to it.
+ */
+static __inline__ int
+qemu_pipe_open(const char* pipeName)
+{
+ char buff[256];
+ int buffLen;
+ int fd, ret;
+
+ if (pipeName == NULL || pipeName[0] == '\0') {
+ errno = EINVAL;
+ return -1;
+ }
+
+ snprintf(buff, sizeof buff, "pipe:%s", pipeName);
+
+ fd = open("/dev/qemu_pipe", O_RDWR);
+ if (fd < 0) {
+ D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
+ //errno = ENOSYS;
+ return -1;
+ }
+
+ buffLen = strlen(buff);
+
+ ret = TEMP_FAILURE_RETRY(write(fd, buff, buffLen+1));
+ if (ret != buffLen+1) {
+ D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno));
+ if (ret == 0) {
+ errno = ECONNRESET;
+ } else if (ret > 0) {
+ errno = EINVAL;
+ }
+ return -1;
+ }
+
+ return fd;
+}
+
+#endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */
