1 //===-- sanitizer_libc.h ----------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is shared between AddressSanitizer and ThreadSanitizer 10 // run-time libraries. 11 // These tools can not use some of the libc functions directly because those 12 // functions are intercepted. Instead, we implement a tiny subset of libc here. 13 // FIXME: Some of functions declared in this file are in fact POSIX, not libc. 14 //===----------------------------------------------------------------------===// 15 16 #ifndef SANITIZER_LIBC_H 17 #define SANITIZER_LIBC_H 18 19 // ----------- ATTENTION ------------- 20 // This header should NOT include any other headers from sanitizer runtime. 21 #include "sanitizer_internal_defs.h" 22 23 namespace __sanitizer { 24 25 // internal_X() is a custom implementation of X() for use in RTL. 26 27 extern "C" { 28 // These are used as builtin replacements; see sanitizer_redefine_builtins.h. 29 // In normal runtime code, use the __sanitizer::internal_X() aliases instead. 30 SANITIZER_INTERFACE_ATTRIBUTE void *__sanitizer_internal_memcpy(void *dest, 31 const void *src, 32 uptr n); 33 SANITIZER_INTERFACE_ATTRIBUTE void *__sanitizer_internal_memmove( 34 void *dest, const void *src, uptr n); 35 SANITIZER_INTERFACE_ATTRIBUTE void *__sanitizer_internal_memset(void *s, int c, 36 uptr n); 37 } // extern "C" 38 39 // String functions 40 s64 internal_atoll(const char *nptr); 41 void *internal_memchr(const void *s, int c, uptr n); 42 void *internal_memrchr(const void *s, int c, uptr n); 43 int internal_memcmp(const void* s1, const void* s2, uptr n); 44 ALWAYS_INLINE void *internal_memcpy(void *dest, const void *src, uptr n) { 45 return __sanitizer_internal_memcpy(dest, src, n); 46 } 47 ALWAYS_INLINE void *internal_memmove(void *dest, const void *src, uptr n) { 48 return __sanitizer_internal_memmove(dest, src, n); 49 } 50 // Should not be used in performance-critical places. 51 ALWAYS_INLINE void *internal_memset(void *s, int c, uptr n) { 52 return __sanitizer_internal_memset(s, c, n); 53 } 54 char* internal_strchr(const char *s, int c); 55 char *internal_strchrnul(const char *s, int c); 56 int internal_strcmp(const char *s1, const char *s2); 57 uptr internal_strcspn(const char *s, const char *reject); 58 char *internal_strdup(const char *s); 59 uptr internal_strlen(const char *s); 60 uptr internal_strlcat(char *dst, const char *src, uptr maxlen); 61 char *internal_strncat(char *dst, const char *src, uptr n); 62 int internal_strncmp(const char *s1, const char *s2, uptr n); 63 uptr internal_strlcpy(char *dst, const char *src, uptr maxlen); 64 char *internal_strncpy(char *dst, const char *src, uptr n); 65 uptr internal_strnlen(const char *s, uptr maxlen); 66 char *internal_strrchr(const char *s, int c); 67 char *internal_strstr(const char *haystack, const char *needle); 68 // Works only for base=10 and doesn't set errno. 69 s64 internal_simple_strtoll(const char *nptr, const char **endptr, int base); 70 int internal_snprintf(char *buffer, uptr length, const char *format, ...) 71 FORMAT(3, 4); 72 uptr internal_wcslen(const wchar_t *s); 73 uptr internal_wcsnlen(const wchar_t *s, uptr maxlen); 74 75 // Return true if all bytes in [mem, mem+size) are zero. 76 // Optimized for the case when the result is true. 77 bool mem_is_zero(const char *mem, uptr size); 78 79 // I/O 80 // Define these as macros so we can use them in linker initialized global 81 // structs without dynamic initialization. 82 #define kInvalidFd ((fd_t)-1) 83 #define kStdinFd ((fd_t)0) 84 #define kStdoutFd ((fd_t)1) 85 #define kStderrFd ((fd_t)2) 86 87 uptr internal_ftruncate(fd_t fd, uptr size); 88 89 // OS 90 void NORETURN internal__exit(int exitcode); 91 void internal_sleep(unsigned seconds); 92 void internal_usleep(u64 useconds); 93 94 uptr internal_getpid(); 95 uptr internal_getppid(); 96 97 int internal_dlinfo(void *handle, int request, void *p); 98 99 // Threading 100 uptr internal_sched_yield(); 101 102 // Error handling 103 bool internal_iserror(uptr retval, int *rverrno = nullptr); 104 105 } // namespace __sanitizer 106 107 #endif // SANITIZER_LIBC_H 108