From 65f2d3aeee4a3179fe662e8f7cabce0a3e29a325 Mon Sep 17 00:00:00 2001
From: The Android Open Source Project <initial-contribution@android.com>
Date: Wed, 18 Mar 2009 17:39:47 -0700
Subject: auto import from //branches/cupcake_rel/...@140373

---
 include/hardware/qemud.h | 144 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 include/hardware/qemud.h

(limited to 'include/hardware/qemud.h')

diff --git a/include/hardware/qemud.h b/include/hardware/qemud.h
new file mode 100644
index 0000000..874a32f
--- /dev/null
+++ b/include/hardware/qemud.h
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2008 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_QEMUD_H
+#define ANDROID_INCLUDE_HARDWARE_QEMUD_H
+
+#include <cutils/sockets.h>
+
+/* the following is helper code that is used by the QEMU-specific
+ * hardware HAL modules to communicate with the emulator program
+ * through the 'qemud' multiplexing daemon.
+ *
+ * see the documentation comments for details in
+ * development/emulator/qemud/qemud.c
+ *
+ * all definitions here are built into the HAL module to avoid
+ * having to write a tiny shared library for this.
+ */
+
+/* we expect the D macro to be defined to a function macro
+ * that sends its formatted string argument(s) to the log.
+ * If not, ignore the traces.
+ */
+#ifndef D
+#  define  D(...)  ((void)0)
+#endif
+
+static __inline__ int
+qemud_fd_write(int  fd, const void*  buff, int  len)
+{
+    int  len2;
+    do {
+        len2 = write(fd, buff, len);
+    } while (len2 < 0 && errno == EINTR);
+    return len2;
+}
+
+static __inline__ int
+qemud_fd_read(int  fd, void*  buff, int  len)
+{
+    int  len2;
+    do {
+        len2 = read(fd, buff, len);
+    } while (len2 < 0 && errno == EINTR);
+    return len2;
+}
+
+static __inline__ int
+qemud_channel_open(const char*  name)
+{
+    int  fd;
+    int  namelen = strlen(name);
+    char answer[2];
+
+    /* connect to qemud control socket */
+    fd = socket_local_client( "qemud",
+                              ANDROID_SOCKET_NAMESPACE_RESERVED,
+                              SOCK_STREAM );
+    if (fd < 0) {
+        D("no qemud control socket: %s", strerror(errno));
+        return -1;
+    }
+
+    /* send service name to connect */
+    if (qemud_fd_write(fd, name, namelen) != namelen) {
+        D("can't send service name to qemud: %s",
+           strerror(errno));
+        close(fd);
+        return -1;
+    }
+
+    /* read answer from daemon */
+    if (qemud_fd_read(fd, answer, 2) != 2 ||
+        answer[0] != 'O' || answer[1] != 'K') {
+        D("cant' connect to %s service through qemud", name);
+        close(fd);
+        return -1;
+    }
+    return fd;
+}
+
+static __inline__ int
+qemud_channel_send(int  fd, const void*  msg, int  msglen)
+{
+    char  header[5];
+
+    if (msglen < 0)
+        msglen = strlen((const char*)msg);
+
+    if (msglen == 0)
+        return 0;
+
+    snprintf(header, sizeof header, "%04x", msglen);
+    if (qemud_fd_write(fd, header, 4) != 4) {
+        D("can't write qemud frame header: %s", strerror(errno));
+        return -1;
+    }
+
+    if (qemud_fd_write(fd, msg, msglen) != msglen) {
+        D("can4t write qemud frame payload: %s", strerror(errno));
+        return -1;
+    }
+    return 0;
+}
+
+static __inline__ int
+qemud_channel_recv(int  fd, void*  msg, int  msgsize)
+{
+    char  header[5];
+    int   size, avail;
+
+    if (qemud_fd_read(fd, header, 4) != 4) {
+        D("can't read qemud frame header: %s", strerror(errno));
+        return -1;
+    }
+    header[4] = 0;
+    if (sscanf(header, "%04x", &size) != 1) {
+        D("malformed qemud frame header: '%.*s'", 4, header);
+        return -1;
+    }
+    if (size > msgsize)
+        return -1;
+
+    if (qemud_fd_read(fd, msg, size) != size) {
+        D("can't read qemud frame payload: %s", strerror(errno));
+        return -1;
+    }
+    return size;
+}
+
+#endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_H */
-- 
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