Technical Reference: Communications, Volume 1

DLC_QUERY_LS ioctl Operation for DLC

The following parameter block queries statistics of a particular link station (LS):
struct dlc_qls_arg { __ulong32_t gdlc_sap_corr; /* GDLC SAP correlator */ __ulong32_t gdlc_ls_corr; /* GDLC ls correlator */ __ulong32_t user_sap_corr; /* user's SAP correlator - RETURNED */ __ulong32_t user_ls_corr; /* user's link station corr-RETURNED */ u_char_t ls_diag[DLC_MAX_DIAG]; /* the char name of the ls */ __ulong32_t ls_state; /* current ls state */ __ulong32_t ls_sub_state; /* further clarification of state */ struct dlc_ls_counters counters; __ulong32_t protodd_len; /*protocol dependent data byte length*/ };

The fields of this ioctl operation are:

`gdlc_sap_corr`	Specifies the generic data link control (GDLC) service access point (SAP) correlator of the target LS.
`gdlc_ls_corr`	Specifies the GDLC LS correlator to be queried.
`user_sap_corr`	Specifies the user SAP correlator returned for routing purposes.
`user_ls_corr`	Specifies the user LS correlator, that is the user LS identifier returned for routing purposes.
`ls_diag`	Contains the link station (LS) diagnostic tag. Indicates the ASCII character string tag passed to GDLC at the DLC_START_LS ioctl operation to identify the station being queried. For example, SNA services puts the attachment profile name in this field.
`ls_state`	Contains the current state of this LS: DLC_OPENING Indicates the SAP or link station is in the process of opening. DLC_OPENED Indicates the SAP or link station has been opened. DLC_CLOSING Indicates the SAP or link station is the process of closing. DLC_INACTIVE Indicates the link station is currently inactive.
`ls_sub_state`	Contains the current substate of this LS. Several indicators may be active concurrently. DLC_CALLING Indicates the link station is calling. DLC_LISTENING Indicates the link station is listening. DLC_CONTACTED Indicates the link station is contacted into sequenced data mode. DLC_LOCAL_BUSY Indicates the local link station is currently busy. DLC_REMOTE_BUSY Indicates the remote link station is currently busy.
`counters`	Contains link station reliability/availability/serviceability counters. These 14 reliability/availability/serviceability counters are shown as an example only. Each GDLC device manager provides as many of these counters as necessary to diagnose specific network problems for its protocol type. test_cmds_sent Specifies the number of test commands sent. test_cmds_fail Specifies the number of test commands failed. test_cmds_rec Specifies the number of test commands received. data_pkt_sent Specifies the number of sequenced data packets sent. data_pkt_resent Specifies the number of sequenced data packets resent. max_cont_resent Specifies the maximum number of contiguous resendings. data_pkt_rec Indicates data packets received. inv_pkt_rec Specifies the number of invalid packets received. adp_rec_err Specifies the number of data-detected receive errors. adp_send_err Specifies the number of data-detected transmit errors. rec_inact_to Specifies the number of received inactivity timeouts. cmd_polls_sent Specifies the number of command polls sent. cmd_repolls_sent Specifies the number of command repolls sent. cmd_cont_repolls Specifies the maximum number of continuous repolls sent.
`protodd_len`	Indicates length of protocol-dependent data. This field contains the byte length of the following area.

The protocol-dependent data contains any additional statistics that a particular GDLC device manager might provide. See the individual GDLC specifications for information on the specific fields returned. This optional data area must directly follow (or append to) the end of the dlc_qls_arg structure.

Implementation Specifics

The DLC_QUERY_LS ioctl operation is selectable through the fp_ioctl kernel service or the ioctl subroutine. It can be called from the process environment only.