bugreport.cpp revision 997abb668b9248c2174c6cf169a0b7c6a02fd2cb 
1/*
2 * Copyright (C) 2009 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 <stdio.h>
19#include <sys/socket.h>
20#include <sys/types.h>
21#include <unistd.h>
22
23#include <cutils/properties.h>
24#include <cutils/sockets.h>
25
26// This program will trigger the dumpstate service to start a call to
27// dumpstate, then connect to the dumpstate local client to read the
28// output. All of the dumpstate output is written to stdout, including
29// any errors encountered while reading/writing the output.
30int main() {
31  // Start the dumpstate service.
32  property_set("ctl.start", "dumpstate");
33
34  // Socket will not be available until service starts.
35  int s;
36  for (int i = 0; i < 20; i++) {
37    s = socket_local_client("dumpstate", ANDROID_SOCKET_NAMESPACE_RESERVED,
38                            SOCK_STREAM);
39    if (s >= 0)
40      break;
41    // Try again in 1 second.
42    sleep(1);
43  }
44
45  if (s == -1) {
46    printf("Failed to connect to dumpstate service: %s\n", strerror(errno));
47    return 1;
48  }
49
50  // Set a timeout so that if nothing is read in 3 minutes, we'll stop
51  // reading and quit. No timeout in dumpstate is longer than 60 seconds,
52  // so this gives lots of leeway in case of unforeseen time outs.
53  struct timeval tv;
54  tv.tv_sec = 3 * 60;
55  tv.tv_usec = 0;
56  if (setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) == -1) {
57    printf("WARNING: Cannot set socket timeout: %s\n", strerror(errno));
58  }
59
60  while (1) {
61    char buffer[65536];
62    ssize_t bytes_read = TEMP_FAILURE_RETRY(read(s, buffer, sizeof(buffer)));
63    if (bytes_read == 0) {
64      break;
65    } else if (bytes_read == -1) {
66      // EAGAIN really means time out, so change the errno.
67      if (errno == EAGAIN) {
68        errno = ETIMEDOUT;
69      }
70      printf("\nBugreport read terminated abnormally (%s).\n", strerror(errno));
71      break;
72    }
73
74    ssize_t bytes_to_send = bytes_read;
75    ssize_t bytes_written;
76    do {
77      bytes_written = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
78                                               buffer + bytes_read - bytes_to_send,
79                                               bytes_to_send));
80      if (bytes_written == -1) {
81        printf("Failed to write data to stdout: read %zd, trying to send %zd (%s)\n",
82               bytes_read, bytes_to_send, strerror(errno));
83        return 1;
84      }
85      bytes_to_send -= bytes_written;
86    } while (bytes_written != 0 && bytes_to_send > 0);
87  }
88
89  close(s);
90  return 0;
91}
92