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      1 //===-- sanitizer_libc.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 // This file is shared between AddressSanitizer and ThreadSanitizer
     11 // run-time libraries.
     12 // These tools can not use some of the libc functions directly because those
     13 // functions are intercepted. Instead, we implement a tiny subset of libc here.
     14 // FIXME: Some of functions declared in this file are in fact POSIX, not libc.
     15 //===----------------------------------------------------------------------===//
     16 
     17 #ifndef SANITIZER_LIBC_H
     18 #define SANITIZER_LIBC_H
     19 
     20 // ----------- ATTENTION -------------
     21 // This header should NOT include any other headers from sanitizer runtime.
     22 #include "sanitizer_internal_defs.h"
     23 
     24 namespace __sanitizer {
     25 
     26 // internal_X() is a custom implementation of X() for use in RTL.
     27 
     28 // String functions
     29 s64 internal_atoll(const char *nptr);
     30 void *internal_memchr(const void *s, int c, uptr n);
     31 void *internal_memrchr(const void *s, int c, uptr n);
     32 int internal_memcmp(const void* s1, const void* s2, uptr n);
     33 void *internal_memcpy(void *dest, const void *src, uptr n);
     34 void *internal_memmove(void *dest, const void *src, uptr n);
     35 // Should not be used in performance-critical places.
     36 void *internal_memset(void *s, int c, uptr n);
     37 char* internal_strchr(const char *s, int c);
     38 char *internal_strchrnul(const char *s, int c);
     39 int internal_strcmp(const char *s1, const char *s2);
     40 uptr internal_strcspn(const char *s, const char *reject);
     41 char *internal_strdup(const char *s);
     42 uptr internal_strlen(const char *s);
     43 uptr internal_strlcat(char *dst, const char *src, uptr maxlen);
     44 char *internal_strncat(char *dst, const char *src, uptr n);
     45 int internal_strncmp(const char *s1, const char *s2, uptr n);
     46 uptr internal_strlcpy(char *dst, const char *src, uptr maxlen);
     47 char *internal_strncpy(char *dst, const char *src, uptr n);
     48 uptr internal_strnlen(const char *s, uptr maxlen);
     49 char *internal_strrchr(const char *s, int c);
     50 char *internal_strstr(const char *haystack, const char *needle);
     51 // Works only for base=10 and doesn't set errno.
     52 s64 internal_simple_strtoll(const char *nptr, const char **endptr, int base);
     53 int internal_snprintf(char *buffer, uptr length, const char *format, ...);
     54 
     55 // Return true if all bytes in [mem, mem+size) are zero.
     56 // Optimized for the case when the result is true.
     57 bool mem_is_zero(const char *mem, uptr size);
     58 
     59 // I/O
     60 // Define these as macros so we can use them in linker initialized global
     61 // structs without dynamic initialization.
     62 #define kInvalidFd ((fd_t)-1)
     63 #define kStdinFd ((fd_t)0)
     64 #define kStdoutFd ((fd_t)1)
     65 #define kStderrFd ((fd_t)2)
     66 
     67 uptr internal_ftruncate(fd_t fd, uptr size);
     68 
     69 // OS
     70 void NORETURN internal__exit(int exitcode);
     71 unsigned int internal_sleep(unsigned int seconds);
     72 
     73 uptr internal_getpid();
     74 uptr internal_getppid();
     75 
     76 // Threading
     77 uptr internal_sched_yield();
     78 
     79 // Error handling
     80 bool internal_iserror(uptr retval, int *rverrno = nullptr);
     81 
     82 } // namespace __sanitizer
     83 
     84 #endif // SANITIZER_LIBC_H
     85