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/*
* Copyright (C) 2011 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_QEMU_PIPE_H
#define ANDROID_INCLUDE_HARDWARE_QEMU_PIPE_H
#include <sys/cdefs.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <pthread.h> /* for pthread_once() */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#ifndef D
# define D(...) do{}while(0)
#endif
typedef int QEMU_PIPE_HANDLE;
#define QEMU_PIPE_INVALID_HANDLE -1
static __inline__ bool ReadFully(int fd, void* data, size_t byte_count) {
uint8_t* p = (uint8_t*)(data);
size_t remaining = byte_count;
while (remaining > 0) {
ssize_t n = TEMP_FAILURE_RETRY(read(fd, p, remaining));
if (n <= 0) return false;
p += n;
remaining -= n;
}
return true;
}
static __inline__ bool WriteFully(int fd, const void* data, size_t byte_count) {
const uint8_t* p = (const uint8_t*)(data);
size_t remaining = byte_count;
while (remaining > 0) {
ssize_t n = TEMP_FAILURE_RETRY(write(fd, p, remaining));
if (n == -1) return false;
p += n;
remaining -= n;
}
return true;
}
/* Try to open a new Qemu fast-pipe. This function returns a file descriptor
* that can be used to communicate with a named service managed by the
* emulator.
*
* This file descriptor can be used as a standard pipe/socket descriptor.
*
* 'pipeName' is the name of the emulator service you want to connect to.
* E.g. 'opengles' or 'camera'.
*
* On success, return a valid file descriptor
* Returns -1 on error, and errno gives the error code, e.g.:
*
* EINVAL -> unknown/unsupported pipeName
* ENOSYS -> fast pipes not available in this system.
*
* ENOSYS should never happen, except if you're trying to run within a
* misconfigured emulator.
*
* You should be able to open several pipes to the same pipe service,
* except for a few special cases (e.g. GSM modem), where EBUSY will be
* returned if more than one client tries to connect to it.
*/
static __inline__ int
qemu_pipe_open(const char* pipeName)
{
char buff[256];
int buffLen;
int fd;
if (pipeName == NULL || pipeName[0] == '\0') {
errno = EINVAL;
return -1;
}
snprintf(buff, sizeof buff, "pipe:%s", pipeName);
fd = TEMP_FAILURE_RETRY(open("/dev/qemu_pipe", O_RDWR));
if (fd < 0 && errno == ENOENT)
fd = TEMP_FAILURE_RETRY(open("/dev/goldfish_pipe", O_RDWR));
if (fd < 0) {
D("%s: Could not open /dev/qemu_pipe: %s", __FUNCTION__, strerror(errno));
//errno = ENOSYS;
return -1;
}
buffLen = strlen(buff);
if (!WriteFully(fd, buff, buffLen + 1)) {
D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno));
return -1;
}
return fd;
}
static __inline__ bool
qemu_pipe_valid(QEMU_PIPE_HANDLE pipe) {
return pipe >= 0;
}
#endif /* ANDROID_INCLUDE_HARDWARE_QEMUD_PIPE_H */