1// Copyright (c) 2012, Google Inc.
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29
30// linux_ptrace_dumper.h: Define the google_breakpad::LinuxPtraceDumper
31// class, which is derived from google_breakpad::LinuxDumper to extract
32// information from a crashed process via ptrace.
33// This class was originally splitted from google_breakpad::LinuxDumper.
34
35#ifndef CLIENT_LINUX_MINIDUMP_WRITER_LINUX_PTRACE_DUMPER_H_
36#define CLIENT_LINUX_MINIDUMP_WRITER_LINUX_PTRACE_DUMPER_H_
37
38#include "client/linux/minidump_writer/linux_dumper.h"
39
40namespace google_breakpad {
41
42class LinuxPtraceDumper : public LinuxDumper {
43 public:
44 // Constructs a dumper for extracting information of a given process
45 // with a process ID of |pid|.
46 explicit LinuxPtraceDumper(pid_t pid);
47
48 // Implements LinuxDumper::BuildProcPath().
49 // Builds a proc path for a certain pid for a node (/proc/<pid>/<node>).
50 // |path| is a character array of at least NAME_MAX bytes to return the
51 // result. |node| is the final node without any slashes. Returns true on
52 // success.
53 virtual bool BuildProcPath(char* path, pid_t pid, const char* node) const;
54
55 // Implements LinuxDumper::CopyFromProcess().
56 // Copies content of |length| bytes from a given process |child|,
57 // starting from |src|, into |dest|. This method uses ptrace to extract
58 // the content from the target process. Always returns true.
59 virtual bool CopyFromProcess(void* dest, pid_t child, const void* src,
60 size_t length);
61
62 // Implements LinuxDumper::GetThreadInfoByIndex().
63 // Reads information about the |index|-th thread of |threads_|.
64 // Returns true on success. One must have called |ThreadsSuspend| first.
65 virtual bool GetThreadInfoByIndex(size_t index, ThreadInfo* info);
66
67 // Implements LinuxDumper::IsPostMortem().
68 // Always returns false to indicate this dumper performs a dump of
69 // a crashed process via ptrace.
70 virtual bool IsPostMortem() const;
71
72 // Implements LinuxDumper::ThreadsSuspend().
73 // Suspends all threads in the given process. Returns true on success.
74 virtual bool ThreadsSuspend();
75
76 // Implements LinuxDumper::ThreadsResume().
77 // Resumes all threads in the given process. Returns true on success.
78 virtual bool ThreadsResume();
79
80 protected:
81 // Implements LinuxDumper::EnumerateThreads().
82 // Enumerates all threads of the given process into |threads_|.
83 virtual bool EnumerateThreads();
84
85 private:
86 // Set to true if all threads of the crashed process are suspended.
87 bool threads_suspended_;
88
89 // Read the tracee's registers on kernel with PTRACE_GETREGSET support.
90 // Returns false if PTRACE_GETREGSET is not defined.
91 // Returns true on success.
92 bool ReadRegisterSet(ThreadInfo* info, pid_t tid);
93
94 // Read the tracee's registers on kernel with PTRACE_GETREGS support.
95 // Returns true on success.
96 bool ReadRegisters(ThreadInfo* info, pid_t tid);
97};
98
99} // namespace google_breakpad
100
101#endif // CLIENT_LINUX_HANDLER_LINUX_PTRACE_DUMPER_H_
102