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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 | |
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) { | |
70 | D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno)); | |
71 | //errno = ENOSYS; | |
72 | return -1; | |
73 | } | |
74 | ||
75 | buffLen = strlen(buff); | |
76 | ||
77 | ret = TEMP_FAILURE_RETRY(write(fd, buff, buffLen+1)); | |
78 | if (ret != buffLen+1) { | |
79 | D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno)); | |
80 | if (ret == 0) { | |
81 | errno = ECONNRESET; | |
82 | } else if (ret > 0) { | |
83 | errno = EINVAL; | |
84 | } | |
85 | return -1; | |
86 | } | |
87 | ||
88 | return fd; | |
89 | } | |
90 | ||
91 | #endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */ |