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[official-gcc.git] / libsanitizer / sanitizer_common / sanitizer_linux.h
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1 //===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===//
2 //
3 // This file is distributed under the University of Illinois Open Source
4 // License. See LICENSE.TXT for details.
5 //
6 //===----------------------------------------------------------------------===//
7 //
8 // Linux-specific syscall wrappers and classes.
9 //
10 //===----------------------------------------------------------------------===//
11 #ifndef SANITIZER_LINUX_H
12 #define SANITIZER_LINUX_H
14 #include "sanitizer_platform.h"
15 #if SANITIZER_FREEBSD || SANITIZER_LINUX
16 #include "sanitizer_common.h"
17 #include "sanitizer_internal_defs.h"
18 #include "sanitizer_platform_limits_posix.h"
20 struct link_map; // Opaque type returned by dlopen().
21 struct sigaltstack;
23 namespace __sanitizer {
24 // Dirent structure for getdents(). Note that this structure is different from
25 // the one in <dirent.h>, which is used by readdir().
26 struct linux_dirent;
28 // Syscall wrappers.
29 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
30 uptr internal_sigaltstack(const struct sigaltstack* ss,
31 struct sigaltstack* oss);
32 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
33 __sanitizer_sigset_t *oldset);
34 void internal_sigfillset(__sanitizer_sigset_t *set);
36 // Linux-only syscalls.
37 #if SANITIZER_LINUX
38 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5);
39 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used
40 // (like the process-wide error reporting SEGV handler) must use
41 // internal_sigaction instead.
42 int internal_sigaction_norestorer(int signum, const void *act, void *oldact);
43 void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
44 #if defined(__x86_64__)
45 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
46 int *parent_tidptr, void *newtls, int *child_tidptr);
47 #endif
48 #endif // SANITIZER_LINUX
50 // This class reads thread IDs from /proc/<pid>/task using only syscalls.
51 class ThreadLister {
52 public:
53 explicit ThreadLister(int pid);
54 ~ThreadLister();
55 // GetNextTID returns -1 if the list of threads is exhausted, or if there has
56 // been an error.
57 int GetNextTID();
58 void Reset();
59 bool error();
61 private:
62 bool GetDirectoryEntries();
64 int pid_;
65 int descriptor_;
66 InternalScopedBuffer<char> buffer_;
67 bool error_;
68 struct linux_dirent* entry_;
69 int bytes_read_;
72 // Exposed for testing.
73 uptr ThreadDescriptorSize();
74 uptr ThreadSelf();
75 uptr ThreadSelfOffset();
77 // Matches a library's file name against a base name (stripping path and version
78 // information).
79 bool LibraryNameIs(const char *full_name, const char *base_name);
81 // Read the name of the current binary from /proc/self/exe.
82 uptr ReadBinaryName(/*out*/char *buf, uptr buf_len);
83 // Cache the value of /proc/self/exe.
84 void CacheBinaryName();
86 // Call cb for each region mapped by map.
87 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
88 } // namespace __sanitizer
90 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX
91 #endif // SANITIZER_LINUX_H