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      1 /*
      2  * Copyright (C) 2007-2016 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 
     17 #include <errno.h>
     18 #include <fcntl.h>
     19 #include <unistd.h>
     20 
     21 #include <log/log.h>
     22 
     23 #include "config_write.h"
     24 #include "fake_log_device.h"
     25 #include "log_portability.h"
     26 #include "logger.h"
     27 
     28 static int fakeOpen();
     29 static void fakeClose();
     30 static int fakeWrite(log_id_t log_id, struct timespec *ts,
     31                      struct iovec *vec, size_t nr);
     32 
     33 static int logFds[(int)LOG_ID_MAX] = { -1, -1, -1, -1, -1, -1 };
     34 
     35 LIBLOG_HIDDEN struct android_log_transport_write fakeLoggerWrite = {
     36     .node = { &fakeLoggerWrite.node, &fakeLoggerWrite.node },
     37     .context.private = &logFds,
     38     .name = "fake",
     39     .available = NULL,
     40     .open = fakeOpen,
     41     .close = fakeClose,
     42     .write = fakeWrite,
     43 };
     44 
     45 static int fakeOpen() {
     46     int i;
     47 
     48     for (i = 0; i < LOG_ID_MAX; i++) {
     49         char buf[sizeof("/dev/log_security")];
     50         snprintf(buf, sizeof(buf), "/dev/log_%s", android_log_id_to_name(i));
     51         logFds[i] = fakeLogOpen(buf, O_WRONLY);
     52     }
     53     return 0;
     54 }
     55 
     56 static void fakeClose() {
     57     int i;
     58 
     59     for (i = 0; i < LOG_ID_MAX; i++) {
     60         fakeLogClose(logFds[i]);
     61         logFds[i] = -1;
     62     }
     63 }
     64 
     65 static int fakeWrite(log_id_t log_id, struct timespec *ts __unused,
     66                       struct iovec *vec, size_t nr)
     67 {
     68     ssize_t ret;
     69     int logFd;
     70 
     71     if (/*(int)log_id >= 0 &&*/ (int)log_id >= (int)LOG_ID_MAX) {
     72         return -EBADF;
     73     }
     74 
     75     logFd = logFds[(int)log_id];
     76     ret = TEMP_FAILURE_RETRY(fakeLogWritev(logFd, vec, nr));
     77     if (ret < 0) {
     78         ret = -errno;
     79     }
     80 
     81     return ret;
     82 }
     83