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int main(int argc, char** argv) {
 
	if (argc != 3) {
		::fprintf(stderr, "Usage: %s <filepath> <buffer size>\n", argv[0]);
		return 1;
	}
 
	char* filename = argv[1];
	size_t buf_size = ::strtoul(argv[2], NULL, 10);;
 
	if (buf_size == 0) {
		::fprintf(stderr, "Usage: %s <filepath> <buffer size>\n", filename);
		::fprintf(stderr, "<buffer size> must be greater than zero\n", filename);
		return 1;
	}
 
	time_t u_start = time(NULL);
 
	void* p_buf;
	ssize_t i_size;
	int fd = ::open(filename, O_RDONLY|O_LARGEFILE);
 
	if (fd < 0) {
		::fprintf(stderr, "fatal error: open file error \"%s\"\n", filename);
		return 1;
	}
 
	p_buf = ::malloc(buf_size);
 
	do {
		if ((i_size = ::read(fd, p_buf, buf_size)) < 0)  {
			::fprintf(stderr, "fatal error: %u bytes read error\n", buf_size);
			return 1;
		}
	} while (i_size == buf_size);
 
	::free(p_buf);
	::fprintf(stdout, "%d\n", time(NULL) - u_start);
	return 0;
}
 

prog.cpp: In function ‘int main(int, char**)’:
prog.cpp:4:3: error: ‘::fprintf’ has not been declared
   ::fprintf(stderr, "Usage: %s <filepath> <buffer size>\n", argv[0]);
   ^~
prog.cpp:4:13: error: ‘stderr’ was not declared in this scope
   ::fprintf(stderr, "Usage: %s <filepath> <buffer size>\n", argv[0]);
             ^~~~~~
prog.cpp:9:2: error: ‘size_t’ was not declared in this scope
  size_t buf_size = ::strtoul(argv[2], NULL, 10);;
  ^~~~~~
prog.cpp:11:6: error: ‘buf_size’ was not declared in this scope
  if (buf_size == 0) {
      ^~~~~~~~
prog.cpp:12:3: error: ‘::fprintf’ has not been declared
   ::fprintf(stderr, "Usage: %s <filepath> <buffer size>\n", filename);
   ^~
prog.cpp:12:13: error: ‘stderr’ was not declared in this scope
   ::fprintf(stderr, "Usage: %s <filepath> <buffer size>\n", filename);
             ^~~~~~
prog.cpp:13:3: error: ‘::fprintf’ has not been declared
   ::fprintf(stderr, "<buffer size> must be greater than zero\n", filename);
   ^~
prog.cpp:17:2: error: ‘time_t’ was not declared in this scope
  time_t u_start = time(NULL);
  ^~~~~~
prog.cpp:20:2: error: ‘ssize_t’ was not declared in this scope
  ssize_t i_size;
  ^~~~~~~
prog.cpp:21:11: error: ‘::open’ has not been declared
  int fd = ::open(filename, O_RDONLY|O_LARGEFILE);
           ^~
prog.cpp:21:28: error: ‘O_RDONLY’ was not declared in this scope
  int fd = ::open(filename, O_RDONLY|O_LARGEFILE);
                            ^~~~~~~~
prog.cpp:21:37: error: ‘O_LARGEFILE’ was not declared in this scope
  int fd = ::open(filename, O_RDONLY|O_LARGEFILE);
                                     ^~~~~~~~~~~
prog.cpp:24:3: error: ‘::fprintf’ has not been declared
   ::fprintf(stderr, "fatal error: open file error \"%s\"\n", filename);
   ^~
prog.cpp:24:13: error: ‘stderr’ was not declared in this scope
   ::fprintf(stderr, "fatal error: open file error \"%s\"\n", filename);
             ^~~~~~
prog.cpp:28:10: error: ‘::malloc’ has not been declared
  p_buf = ::malloc(buf_size);
          ^~
prog.cpp:28:19: error: ‘buf_size’ was not declared in this scope
  p_buf = ::malloc(buf_size);
                   ^~~~~~~~
prog.cpp:31:8: error: ‘i_size’ was not declared in this scope
   if ((i_size = ::read(fd, p_buf, buf_size)) < 0)  {
        ^~~~~~
prog.cpp:31:17: error: ‘::read’ has not been declared
   if ((i_size = ::read(fd, p_buf, buf_size)) < 0)  {
                 ^~
prog.cpp:32:4: error: ‘::fprintf’ has not been declared
    ::fprintf(stderr, "fatal error: %u bytes read error\n", buf_size);
    ^~
prog.cpp:32:14: error: ‘stderr’ was not declared in this scope
    ::fprintf(stderr, "fatal error: %u bytes read error\n", buf_size);
              ^~~~~~
prog.cpp:35:11: error: ‘i_size’ was not declared in this scope
  } while (i_size == buf_size);
           ^~~~~~
prog.cpp:37:2: error: ‘::free’ has not been declared
  ::free(p_buf);
  ^~
prog.cpp:38:2: error: ‘::fprintf’ has not been declared
  ::fprintf(stdout, "%d\n", time(NULL) - u_start);
  ^~
prog.cpp:38:12: error: ‘stdout’ was not declared in this scope
  ::fprintf(stdout, "%d\n", time(NULL) - u_start);
            ^~~~~~
prog.cpp:38:33: error: ‘NULL’ was not declared in this scope
  ::fprintf(stdout, "%d\n", time(NULL) - u_start);
                                 ^~~~
prog.cpp:38:37: error: ‘time’ was not declared in this scope
  ::fprintf(stdout, "%d\n", time(NULL) - u_start);
                                     ^
prog.cpp:38:41: error: ‘u_start’ was not declared in this scope
  ::fprintf(stdout, "%d\n", time(NULL) - u_start);
                                         ^~~~~~~

Standard output is empty