/*  * open_limit - determine the current open file limit  *   * Environment: POSIX, 44BSD, 43BSD  *   * Author: Wietse Venema.  */#include <sys/types.h>#include <sys/time.h>#include <sys/resource.h>/* 44BSD compatibility. */#ifndef RLIMIT_NOFILE# ifdef RLIMIT_OFILE#  define RLIMIT_NOFILE RLIMIT_OFILE# endif#endifint     open_limit(){#ifdef RLIMIT_NOFILE    struct rlimit rl;    getrlimit(RLIMIT_NOFILE, &rl);    return (rl.rlim_cur);#else    return (getdtablesize());#endif}