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 16#include "sanitizer_common.h" 17#include "sanitizer_internal_defs.h" 18#include "sanitizer_platform_limits_posix.h" 19 20struct link_map; // Opaque type returned by dlopen(). 21struct sigaltstack; 22 23namespace __sanitizer { 24// Dirent structure for getdents(). Note that this structure is different from 25// the one in <dirent.h>, which is used by readdir(). 26struct linux_dirent; 27 28// Syscall wrappers. 29uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count); 30uptr internal_sigaltstack(const struct sigaltstack* ss, 31 struct sigaltstack* oss); 32uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set, 33 __sanitizer_sigset_t *oldset); 34void internal_sigfillset(__sanitizer_sigset_t *set); 35 36// Linux-only syscalls. 37#if SANITIZER_LINUX 38uptr 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. 42int internal_sigaction_norestorer(int signum, const void *act, void *oldact); 43void internal_sigdelset(__sanitizer_sigset_t *set, int signum); 44#if defined(__x86_64__) 45uptr 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. 51class 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. 73uptr ThreadDescriptorSize(); 74uptr ThreadSelf(); 75uptr ThreadSelfOffset(); 76 77// Matches a library's file name against a base name (stripping path and version 78// information). 79bool LibraryNameIs(const char *full_name, const char *base_name); 80 81// Read the name of the current binary from /proc/self/exe. 82uptr ReadBinaryName(/*out*/char *buf, uptr buf_len); 83// Cache the value of /proc/self/exe. 84void CacheBinaryName(); 85 86// Call cb for each region mapped by map. 87void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)); 88} // namespace __sanitizer 89 90#endif // SANITIZER_FREEBSD || SANITIZER_LINUX 91#endif // SANITIZER_LINUX_H 92