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95 lines
2.8 KiB
95 lines
2.8 KiB
6 years ago
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
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#define ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
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#include <sys/cdefs.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <pthread.h> /* for pthread_once() */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#ifndef D
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# define D(...) do{}while(0)
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#endif
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/* Try to open a new Qemu fast-pipe. This function returns a file descriptor
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* that can be used to communicate with a named service managed by the
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* emulator.
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*
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* This file descriptor can be used as a standard pipe/socket descriptor.
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*
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* 'pipeName' is the name of the emulator service you want to connect to.
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* E.g. 'opengles' or 'camera'.
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*
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* On success, return a valid file descriptor
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* Returns -1 on error, and errno gives the error code, e.g.:
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*
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* EINVAL -> unknown/unsupported pipeName
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* ENOSYS -> fast pipes not available in this system.
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*
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* ENOSYS should never happen, except if you're trying to run within a
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* misconfigured emulator.
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*
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* You should be able to open several pipes to the same pipe service,
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* except for a few special cases (e.g. GSM modem), where EBUSY will be
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* returned if more than one client tries to connect to it.
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*/
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static __inline__ int
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qemu_pipe_open(const char* pipeName)
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{
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char buff[256];
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int buffLen;
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int fd, ret;
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if (pipeName == NULL || pipeName[0] == '\0') {
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errno = EINVAL;
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return -1;
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}
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snprintf(buff, sizeof buff, "pipe:%s", pipeName);
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fd = open("/dev/qemu_pipe", O_RDWR);
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if (fd < 0 && errno == ENOENT)
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fd = open("/dev/goldfish_pipe", O_RDWR);
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if (fd < 0) {
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D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
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//errno = ENOSYS;
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return -1;
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}
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buffLen = strlen(buff);
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ret = TEMP_FAILURE_RETRY(write(fd, buff, buffLen+1));
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if (ret != buffLen+1) {
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D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno));
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if (ret == 0) {
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errno = ECONNRESET;
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} else if (ret > 0) {
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errno = EINVAL;
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}
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return -1;
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}
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return fd;
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}
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#endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */
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