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closes a previously opened line device cc_Close( )
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printf("Error opening device: errno = %d\n", errno);
exit(1);
}
printf("Waiting for call\n");
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)
procdevfail(devhdl);
}
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);
}
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Errors
If the function returns < 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 returned value. Error codes are defined in the files ccerr.h,
isdnerr.h and isdncmd.h.
Typically, a < 0 return code for the cc_Close( ) function indicates that the function
reference (the device number) is not valid for the function call.