Function main

lib_acl_cpp/samples/mmap/main.cpp:31–115

}

int main(int argc, char* argv[])
{
	acl::string action("get");
	bool  unuse = false;
	int   ch;

	while ((ch = getopt(argc, argv, "hf:n:uo:")) > 0)
	{
		switch (ch)
		{
		case 'h':
			usage(argv[0]);
			return 0;
		case 'f':
			__fpath = optarg;
			break;
		case 'n':
			__max = atol(optarg);
			break;
		case 'u':
			unuse = true;
			break;
		case 'o':
			action = optarg;
			break;
		default:
			break;
		}
	}

	int fd = open(__fpath.c_str(), O_RDWR | O_CREAT, 0600);
	if (fd == -1)
	{
		printf("open %s error\r\n", __fpath.c_str());
		return 1;
	}

	char* ptr = (char*) mmap(NULL, __max, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
	if (ptr == NULL)
	{
		printf("mmap error %s\r\n", acl::last_serror());
		return 1;
	}

	printf("file size: %ld\r\n", __max);
	lseek(fd, __max, SEEK_SET);
	write(fd, "x", 1);
	close(fd);
	char* ptr_saved = ptr;

	printf("action: %s\r\n", action.c_str());

	if (action == "get")
	{
		for (off_t i = 0; i < __max; i++)
		{
			ch = *ptr++;
			if (i % 9999999 == 0)