1 //===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Linux-specific syscall wrappers and classes. 11 // 12 //===----------------------------------------------------------------------===// 13 #ifndef SANITIZER_LINUX_H 14 #define SANITIZER_LINUX_H 15 16 #include "sanitizer_platform.h" 17 #if SANITIZER_FREEBSD || SANITIZER_LINUX 18 #include "sanitizer_common.h" 19 #include "sanitizer_internal_defs.h" 20 #include "sanitizer_posix.h" 21 #include "sanitizer_platform_limits_posix.h" 22 23 struct link_map; // Opaque type returned by dlopen(). 24 struct sigaltstack; 25 26 namespace __sanitizer { 27 // Dirent structure for getdents(). Note that this structure is different from 28 // the one in <dirent.h>, which is used by readdir(). 29 struct linux_dirent; 30 31 // Syscall wrappers. 32 uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count); 33 uptr internal_sigaltstack(const struct sigaltstack* ss, 34 struct sigaltstack* oss); 35 uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 36 __sanitizer_sigset_t *oldset); 37 void internal_sigfillset(__sanitizer_sigset_t *set); 38 39 // Linux-only syscalls. 40 #if SANITIZER_LINUX 41 uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5); 42 // Used only by sanitizer_stoptheworld. Signal handlers that are actually used 43 // (like the process-wide error reporting SEGV handler) must use 44 // internal_sigaction instead. 45 int internal_sigaction_norestorer(int signum, const void *act, void *oldact); 46 void internal_sigdelset(__sanitizer_sigset_t *set, int signum); 47 #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \ 48 || defined(__powerpc64__) 49 uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, 50 int *parent_tidptr, void *newtls, int *child_tidptr); 51 #endif 52 #endif // SANITIZER_LINUX 53 54 // This class reads thread IDs from /proc/<pid>/task using only syscalls. 55 class ThreadLister { 56 public: 57 explicit ThreadLister(int pid); 58 ~ThreadLister(); 59 // GetNextTID returns -1 if the list of threads is exhausted, or if there has 60 // been an error. 61 int GetNextTID(); 62 void Reset(); 63 bool error(); 64 65 private: 66 bool GetDirectoryEntries(); 67 68 int pid_; 69 int descriptor_; 70 InternalScopedBuffer<char> buffer_; 71 bool error_; 72 struct linux_dirent* entry_; 73 int bytes_read_; 74 }; 75 76 // Exposed for testing. 77 uptr ThreadDescriptorSize(); 78 uptr ThreadSelf(); 79 uptr ThreadSelfOffset(); 80 81 // Matches a library's file name against a base name (stripping path and version 82 // information). 83 bool LibraryNameIs(const char *full_name, const char *base_name); 84 85 // Call cb for each region mapped by map. 86 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)); 87 } // namespace __sanitizer 88 89 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX 90 #endif // SANITIZER_LINUX_H 91