通过pid获取程序名

getprogname_by_pid

const char *getprogname_by_pid(int pid)
{
	static char path[1024];
	static char sympath[32];
	int len = 0;
	snprintf(sympath, sizeof(sympath), "/proc/%d/exe", pid);

	len = readlink(sympath, path, sizeof(path) - 1);
	if (len < 0)
		return NULL;
	path[len] = 0;
	return path;
}