cc_GetBChanState( )

Description | Caution | Example | Errors | See Also

Name:	int cc_GetBChanState(linedev, bchstate_buf)
Inputs:	LINEDEV linedev	line device handle for the B channel
	int *bchstate_buf	pointer to the location where the B channel state value is stored
Returns:	0 on success < 0 on failure
Includes:	cclib.h
Category:	System tools
Mode:	synchronous
Technology:	BRI/SC; PRI (all protocols)

Description

The cc_GetBChanState( ) function retrieves the status of the B channel at any time.

Parameter	Description
linedev:	The line device handle for the B channel.
bchstate_buf:	Points to the buffer containing the requested B channel state value. The definitions of the possible channel states are:
	ISDN_IN_SERVICE	B channel is in service
	ISDN_MAINTENANCE	B channel is in maintenance
	ISDN_OUT_OF_SERVICE	B channel is out of service

Caution

This function is not supported for the BRI/2 board.

Example

#include <windows.h>   /* For Windows applications only */  
#include <stdio.h>  
#include <errno.h>  
#include "srllib.h"  
#include "dtilib.h"  
#include "cclib.h"  
void main()  
{  
   LINEDEV   devhdl    = 0;  
   CRN       crn = 0;  
   char     *devname = "dtiB1T1";  
   int       bchanstate;  
   if ( cc_Open( &devhdl, devname, 0 ) < 0 )   
   {  
      printf("Error opening device: errno = %d\n", errno);  
      exit(1);  
   }  
  /*   
   * Using cc_GetBChanState() to get the current  
   * B channel status.  
   */  
   if ( cc_GetBChanState(devhdl,&bchanstate) < 0 )  
        procdevfail(devhdl);  
   else if ( bchanstate != ISDN_IN_SERVICE )  
   {  
      printf("B Channel is not in service...\n");  
      if ( cc_Close( devhdl ) < 0 )   
           printf("Error closing device, errno = %d\n", errno);  
      exit(1);  
   }  
   if ( cc_WaitCall(devhdl, &crn, NULL, -1, EV_SYNC) < 0 )  
        procdevfail(devhdl);  
   if ( cc_AnswerCall(crn, 0, EV_SYNC) < 0 )  
        callfail(crn);  
        .  
        .  
        .  
        .  
        .  
   /* Drop the call */  
   if ( cc_DropCall(crn, NORMAL_CLEARING, EV_SYNC) < 0 )  
        callfail(crn);  
   if ( cc_ReleaseCall(crn) < 0 )  
        callfail(crn);  
   if ( cc_Close( devhdl ) < 0 )   
      printf("Error closing device, errno = %d\n", errno);  
}  
int callfail(CRN crn)  
{                 
        LINEDEV ld;  
        cc_CRN2LineDev(crn,&ld);  
        procdevfail(ld);  
}  
int procdevfail(LINEDEV handle)  
{  
        int reason;  
        char *msg;  
        reason = cc_CauseValue(handle);  
        cc_ResultMsg(handle,reason,&msg);  
        printf("reason = %x - %s\n",reason,msg);  
}

Errors

If the function returns a value < 0 to indicate failure, use the cc_CauseValue( ) function to retrieve the reason code for the failure. The cc_ResultMsg( ) function can be used to interpret the reason code. Error codes are defined in the files ccerr.h, isdnerr.h, and isdncmd.h.

Error codes from the cc_GetBChanState( ) function include the following:

Error Code	Description
ERR_ISDN_LIB | E_ISBADIF	Bad interface number
ERR_ISDN_LIB | E_ISBADTS	Bad time slot

See Also

None

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