1// RUN: %clangxx_msan -std=c++11 -O0 %s -o %t && %run %t
2// RUN: %clangxx_msan -std=c++11 -fsanitize-memory-track-origins -O0 %s -o %t && %run %t
3
4#include <assert.h>
5#include <stdio.h>
6
7#include <sanitizer/msan_interface.h>
8
9int main(int argc, char *argv[]) {
10 FILE *f = fopen(filename: argv[0], modes: "r");
11 assert(f);
12 char buf[50];
13 fread(ptr: buf, size: 1, n: 1, stream: f);
14 fflush(stream: f);
15
16 assert(f->_IO_read_end > f->_IO_read_base);
17 __msan_check_mem_is_initialized(x: f->_IO_read_end, size: f->_IO_read_end - f->_IO_read_base);
18
19 char tmp_file[1000];
20 sprintf(s: tmp_file, format: "%s.write.tmp", argv[0]);
21
22 f = fopen(filename: tmp_file, modes: "w+");
23 assert(f);
24 fwrite(ptr: buf, size: 1, n: 1, s: f);
25 fflush(stream: f);
26
27 assert(f->_IO_write_end > f->_IO_write_base);
28 __msan_check_mem_is_initialized(x: f->_IO_write_end, size: f->_IO_write_end - f->_IO_write_base);
29}
30

source code of compiler-rt/test/msan/Linux/file.cpp