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 <errno.h>
27
28 #ifndef D
29 # define D(...) do{}while(0)
30 #endif
31
32 /* Try to open a new Qemu fast-pipe. This function returns a file descriptor
33 * that can be used to communicate with a named service managed by the
34 * emulator.
35 *
36 * This file descriptor can be used as a standard pipe/socket descriptor.
37 *
38 * 'pipeName' is the name of the emulator service you want to connect to.
39 * E.g. 'opengles' or 'camera'.
40 *
41 * On success, return a valid file descriptor
42 * Returns -1 on error, and errno gives the error code, e.g.:
43 *
44 * EINVAL -> unknown/unsupported pipeName
45 * ENOSYS -> fast pipes not available in this system.
46 *
47 * ENOSYS should never happen, except if you're trying to run within a
48 * misconfigured emulator.
49 *
50 * You should be able to open several pipes to the same pipe service,
51 * except for a few special cases (e.g. GSM modem), where EBUSY will be
52 * returned if more than one client tries to connect to it.
53 */
54 static __inline__ int
qemu_pipe_open(const char * pipeName)55 qemu_pipe_open(const char* pipeName)
56 {
57 char buff[256];
58 int buffLen;
59 int fd, ret;
60
61 if (pipeName == NULL || pipeName[0] == '\0') {
62 errno = EINVAL;
63 return -1;
64 }
65
66 snprintf(buff, sizeof buff, "pipe:%s", pipeName);
67
68 fd = open("/dev/qemu_pipe", O_RDWR);
69 if (fd < 0 && errno == ENOENT)
70 fd = open("/dev/goldfish_pipe", O_RDWR);
71 if (fd < 0) {
72 D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
73 //errno = ENOSYS;
74 return -1;
75 }
76
77 buffLen = strlen(buff);
78
79 ret = TEMP_FAILURE_RETRY(write(fd, buff, buffLen+1));
80 if (ret != buffLen+1) {
81 D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno));
82 if (ret == 0) {
83 errno = ECONNRESET;
84 } else if (ret > 0) {
85 errno = EINVAL;
86 }
87 return -1;
88 }
89
90 return fd;
91 }
92
93 #endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */
94