/thirdparty/breakpad/client/linux/crash_generation/crash_generation_client.cc

 1// Copyright (c) 2010 Google Inc.
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17//
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29
30#include <stdio.h>
31#include <sys/socket.h>
32#include <sys/types.h>
33
34#include <algorithm>
35
36#include "client/linux/crash_generation/crash_generation_client.h"
37#include "common/linux/eintr_wrapper.h"
38#include "common/linux/linux_libc_support.h"
39#include "third_party/lss/linux_syscall_support.h"
40
41namespace google_breakpad {
42
43bool
44CrashGenerationClient::RequestDump(const void* blob, size_t blob_size)
45{
46  int fds[2];
47  sys_socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
48  static const unsigned kControlMsgSize = CMSG_SPACE(sizeof(int));
49
50  struct kernel_msghdr msg;
51  my_memset(&msg, 0, sizeof(struct kernel_msghdr));
52  struct kernel_iovec iov[1];
53  iov[0].iov_base = const_cast<void*>(blob);
54  iov[0].iov_len = blob_size;
55
56  msg.msg_iov = iov;
57  msg.msg_iovlen = sizeof(iov) / sizeof(iov[0]);
58  char cmsg[kControlMsgSize];
59  my_memset(cmsg, 0, kControlMsgSize);
60  msg.msg_control = cmsg;
61  msg.msg_controllen = sizeof(cmsg);
62
63  struct cmsghdr* hdr = CMSG_FIRSTHDR(&msg);
64  hdr->cmsg_level = SOL_SOCKET;
65  hdr->cmsg_type = SCM_RIGHTS;
66  hdr->cmsg_len = CMSG_LEN(sizeof(int));
67  int* p = reinterpret_cast<int*>(CMSG_DATA(hdr));
68  *p = fds[1];
69
70  HANDLE_EINTR(sys_sendmsg(server_fd_, &msg, 0));
71  sys_close(fds[1]);
72
73  // wait for an ACK from the server
74  char b;
75  HANDLE_EINTR(sys_read(fds[0], &b, 1));
76
77  return true;
78}
79
80//static
81CrashGenerationClient*
82CrashGenerationClient::TryCreate(int server_fd)
83{
84  if (0 > server_fd)
85    return NULL;
86  return new CrashGenerationClient(server_fd);
87}
88
89}