1 /*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 #ifndef ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
17 #define ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
18
19 #include <sys/cdefs.h>
20 #include <unistd.h>
21 #include <fcntl.h>
22 #include <sys/mman.h>
23 #include <pthread.h> /* for pthread_once() */
24 #include <stdlib.h>
25 #include <stdio.h>
26 #include <string.h>
27 #include <errno.h>
28
29 #ifndef D
30 # define D(...) do{}while(0)
31 #endif
32
33 /* Try to open a new Qemu fast-pipe. This function returns a file descriptor
34 * that can be used to communicate with a named service managed by the
35 * emulator.
36 *
37 * This file descriptor can be used as a standard pipe/socket descriptor.
38 *
39 * 'pipeName' is the name of the emulator service you want to connect to.
40 * E.g. 'opengles' or 'camera'.
41 *
42 * On success, return a valid file descriptor
43 * Returns -1 on error, and errno gives the error code, e.g.:
44 *
45 * EINVAL -> unknown/unsupported pipeName
46 * ENOSYS -> fast pipes not available in this system.
47 *
48 * ENOSYS should never happen, except if you're trying to run within a
49 * misconfigured emulator.
50 *
51 * You should be able to open several pipes to the same pipe service,
52 * except for a few special cases (e.g. GSM modem), where EBUSY will be
53 * returned if more than one client tries to connect to it.
54 */
55 static __inline__ int
qemu_pipe_open(const char * pipeName)56 qemu_pipe_open(const char* pipeName)
57 {
58 char buff[256];
59 int buffLen;
60 int fd, ret;
61
62 if (pipeName == NULL || pipeName[0] == '\0') {
63 errno = EINVAL;
64 return -1;
65 }
66
67 snprintf(buff, sizeof buff, "pipe:%s", pipeName);
68
69 fd = open("/dev/qemu_pipe", O_RDWR);
70 if (fd < 0 && errno == ENOENT)
71 fd = open("/dev/goldfish_pipe", O_RDWR);
72 if (fd < 0) {
73 D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
74 //errno = ENOSYS;
75 return -1;
76 }
77
78 buffLen = strlen(buff);
79
80 ret = TEMP_FAILURE_RETRY(write(fd, buff, buffLen+1));
81 if (ret != buffLen+1) {
82 D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno));
83 if (ret == 0) {
84 errno = ECONNRESET;
85 } else if (ret > 0) {
86 errno = EINVAL;
87 }
88 return -1;
89 }
90
91 return fd;
92 }
93
94 #endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */
95