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 13 14 #include "sanitizer_platform.h" 15 #if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 16 #include "sanitizer_common.h" 17 #include "sanitizer_internal_defs.h" 18 #include "sanitizer_platform_limits_posix.h" 19 20 struct link_map; // Opaque type returned by dlopen(). 21 struct sigaltstack; 22 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; 27 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); 35 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 49 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(); 60 61 private: 62 bool GetDirectoryEntries(); 63 64 int pid_; 65 int descriptor_; 66 InternalScopedBuffer<char> buffer_; 67 bool error_; 68 struct linux_dirent* entry_; 69 int bytes_read_; 70 }; 71 72 // Exposed for testing. 73 uptr ThreadDescriptorSize(); 74 uptr ThreadSelf(); 75 uptr ThreadSelfOffset(); 76 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); 80 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(); 85 86 // Call cb for each region mapped by map. 87 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)); 88 } // namespace __sanitizer 89 90 #endif // SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD 91 #endif // SANITIZER_LINUX_H 92