asterisk0*CLI> core show fd
    3      asterisk.c:1061    (ast_makesocket           ): socket(PF_UNIX,SOCK_STREAM,"tcp")
    4        logger.c:273     (make_logchannel          ): fopen("/var/log/asterisk/messages","a")
    5        logger.c:273     (make_logchannel          ): fopen("/var/log/asterisk/full","a")
    6        logger.c:609     (init_logger              ): fopen("/var/log/asterisk/event_log","a")
    7        logger.c:622     (init_logger              ): fopen("/var/log/asterisk/queue_log","a")
    9      chan_sip.c:18029   (reload_config            ): socket(PF_INET,SOCK_DGRAM,"udp")
   11     pbx_dundi.c:4642    (load_module              ): socket(PF_INET,SOCK_DGRAM,"udp")
   12     chan_iax2.c:11249   (load_module              ): open("/dev/zap/timer",2)
   13       netsock.c:131     (ast_netsock_bindaddr     ): socket(PF_INET,SOCK_DGRAM,"udp")
   14       manager.c:3163    (init_manager             ): socket(PF_INET,SOCK_STREAM,"tcp")
   15      asterisk.c:3165    (main                     ): pipe({15,17})
   16     chan_iax2.c:1856    (try_firmware             ): open("/var/tmp/iaxy.bin-867419759",O_CREAT|O_EXCL|-3585,0600)
   17      asterisk.c:3165    (main                     ): pipe({15,17})
asterisk0*CLI> quit