/*
 * Copyright (C) 2020 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.
 */

#include <atomic>
#include <errno.h>
#include <log/log.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
//#include <linux/vm_sockets.h>
#include <qemu_pipe_bp.h>

#include <sys/cdefs.h>
#include <sys/mman.h>
#include <pthread.h>  /* for pthread_once() */
#include <stdlib.h>
#include <sys/un.h>

#ifndef D
#  define  D(...)   do{}while(0)
#endif
extern "C" {

int qemu_pipe_open_ns(const char* ns, const char* pipeName, int flags) {
    ALOGD("%s:%d coming....device:%s",__FUNCTION__ ,__LINE__,pipeName);
    if (pipeName == NULL || pipeName[0] == '\0') {
        errno = EINVAL;
        return -1;
    }
    int   fd = -1, ret;
    fd = socket(AF_UNIX, SOCK_STREAM, 0);
    struct sockaddr_un addr;
    memset(&addr, 0, sizeof(addr));

    addr.sun_family = AF_UNIX;
    const char sun_path[] = "abstractSocketVmhalbox";
    int sun_path_size = offsetof(struct sockaddr_un, sun_path) + sizeof(sun_path);
    strncpy(addr.sun_path + 1, sun_path, strlen(sun_path));

    if (connect(fd, (struct sockaddr*) &addr, sun_path_size) < 0) {
        close(fd);
        fd = -1;
    }

    if (fd < 0) {
        D("%s: Could not open %s size %d error: %s", __FUNCTION__, sun_path, sun_path_size, strerror(errno));
        //errno = ENOSYS;
        return -1;
    }

    char buf[256];
    int bufLen;
    if (ns) {
        bufLen = snprintf(buf, sizeof(buf), "pipe:%s:%s", ns, pipeName);
    } else {
        bufLen = snprintf(buf, sizeof(buf), "pipe:%s", pipeName);
    }

    if (!qemu_pipe_write_fully(fd, buf, bufLen + 1)) {
        ALOGE("%s:%d: Could not connect to the '%s' service: %s",
              __func__, __LINE__, buf, strerror(errno));
        close(fd);
        return -1;
    }
    ret = TEMP_FAILURE_RETRY(read(fd, buf, 2)); // 读取返回值
    if (ret != 2 || buf[0] != 'O' || buf[1] != 'K') {
        D("%s: Could not connect to %s pipe service: %s", __FUNCTION__, pipeName, strerror(errno));
        close(fd);
        return -1;
    }
    return fd;
}

int qemu_pipe_open(const char* pipeName) {
    return qemu_pipe_open_ns(NULL, pipeName, O_RDWR | O_NONBLOCK);
}

void qemu_pipe_close(int pipe) {
    close(pipe);
}

int qemu_pipe_read(int pipe, void* buffer, int size) {
    return read(pipe, buffer, size);
}

int qemu_pipe_write(int pipe, const void* buffer, int size) {
    return write(pipe, buffer, size);
}

}  // extern "C"