lib/sanitizer_common/sanitizer_libc.h

//===-- sanitizer_libc.h ----------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
// These tools can not use some of the libc functions directly because those
// functions are intercepted. Instead, we implement a tiny subset of libc here.
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_LIBC_H
#define SANITIZER_LIBC_H

// ----------- ATTENTION -------------
// This header should NOT include any other headers from sanitizer runtime.
#include "sanitizer_internal_defs.h"

namespace __sanitizer {

// internal_X() is a custom implementation of X() for use in RTL.

// String functions
s64 internal_atoll(const char *nptr);
void *internal_memchr(const void *s, int c, uptr n);
void *internal_memrchr(const void *s, int c, uptr n);
int internal_memcmp(const void* s1, const void* s2, uptr n);
void *internal_memcpy(void *dest, const void *src, uptr n);
void *internal_memmove(void *dest, const void *src, uptr n);
// Set [s, s + n) to 0. Both s and n should be 16-aligned.
void internal_bzero_aligned16(void *s, uptr n);
// Should not be used in performance-critical places.
void *internal_memset(void *s, int c, uptr n);
char* internal_strchr(const char *s, int c);
char *internal_strchrnul(const char *s, int c);
int internal_strcmp(const char *s1, const char *s2);
uptr internal_strcspn(const char *s, const char *reject);
char *internal_strdup(const char *s);
char *internal_strndup(const char *s, uptr n);
uptr internal_strlen(const char *s);
char *internal_strncat(char *dst, const char *src, uptr n);
int internal_strncmp(const char *s1, const char *s2, uptr n);
char *internal_strncpy(char *dst, const char *src, uptr n);
uptr internal_strnlen(const char *s, uptr maxlen);
char *internal_strrchr(const char *s, int c);
// This is O(N^2), but we are not using it in hot places.
char *internal_strstr(const char *haystack, const char *needle);
// Works only for base=10 and doesn't set errno.
s64 internal_simple_strtoll(const char *nptr, char **endptr, int base);
int internal_snprintf(char *buffer, uptr length, const char *format, ...);

// Return true if all bytes in [mem, mem+size) are zero.
// Optimized for the case when the result is true.
bool mem_is_zero(const char *mem, uptr size);


// Memory
uptr internal_mmap(void *addr, uptr length, int prot, int flags,
                   int fd, u64 offset);
uptr internal_munmap(void *addr, uptr length);

// I/O
const fd_t kInvalidFd = -1;
const fd_t kStdinFd = 0;
const fd_t kStdoutFd = 1;
const fd_t kStderrFd = 2;
uptr internal_close(fd_t fd);
int internal_isatty(fd_t fd);

// Use __sanitizer::OpenFile() instead.
uptr internal_open(const char *filename, int flags);
uptr internal_open(const char *filename, int flags, u32 mode);

uptr internal_read(fd_t fd, void *buf, uptr count);
uptr internal_write(fd_t fd, const void *buf, uptr count);
uptr internal_ftruncate(fd_t fd, uptr size);

// OS
uptr internal_filesize(fd_t fd);  // -1 on error.
uptr internal_stat(const char *path, void *buf);
uptr internal_lstat(const char *path, void *buf);
uptr internal_fstat(fd_t fd, void *buf);
uptr internal_dup2(int oldfd, int newfd);
uptr internal_readlink(const char *path, char *buf, uptr bufsize);
uptr internal_unlink(const char *path);
uptr internal_rename(const char *oldpath, const char *newpath);
void NORETURN internal__exit(int exitcode);
uptr internal_lseek(fd_t fd, OFF_T offset, int whence);

uptr internal_ptrace(int request, int pid, void *addr, void *data);
uptr internal_waitpid(int pid, int *status, int options);
uptr internal_getpid();
uptr internal_getppid();

int internal_fork();

// Threading
uptr internal_sched_yield();

// These functions call appropriate pthread_ functions directly, bypassing
// the interceptor. They are weak and may not be present in some tools.
SANITIZER_WEAK_ATTRIBUTE
int real_pthread_create(void *th, void *attr, void *(*callback)(void *),
                        void *param);
SANITIZER_WEAK_ATTRIBUTE
int real_pthread_join(void *th, void **ret);

#define DEFINE_REAL_PTHREAD_FUNCTIONS                                          \
  namespace __sanitizer {                                                      \
  int real_pthread_create(void *th, void *attr, void *(*callback)(void *),     \
                          void *param) {                                       \
    return REAL(pthread_create)(th, attr, callback, param);                    \
  }                                                                            \
  int real_pthread_join(void *th, void **ret) {                                \
    return REAL(pthread_join(th, ret));                                        \
  }                                                                            \
  }  // namespace __sanitizer

// Error handling
bool internal_iserror(uptr retval, int *rverrno = 0);

int internal_sigaction(int signum, const void *act, void *oldact);

}  // namespace __sanitizer

#endif  // SANITIZER_LIBC_H