110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
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/*
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* Copyright (c) 1993 by the University of Southern California
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*
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* For copying and distribution information, please see the file
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* <usc-copyr.h>.
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*
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* Written by bcn 1/93 to abort pending requests
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*/
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#include <usc-copyr.h>
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#include <posix_signal.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <pfs_threads.h>
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#include <list_macros.h>
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#include <implicit_fixes.h>
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#include <ardp.h>
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#include <pmachine.h>
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extern RREQ ardp_activeQ; /* Info about active requests */
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extern int ardp_port; /* Opened UDP port */
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extern int pfs_debug; /* Debug level */
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extern int ardp_activeQ_len; /* Length of ardp_activeQ */
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/*
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* ardp_abort - abort a pending request
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*
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* ardp_abort takes a pointer to a request structure of a request to
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* be aborted, sends an abort request to the server handling the pending,
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* request, and immediately returns. If the request is null (NOREQ), then
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* all requests on the ardp_activeQ are aborted.
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*/
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int
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ardp_abort(req)
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RREQ req; /* Request to be aborted */
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{
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PTEXT ptmp = NOPKT; /* Abort packet to be sent */
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RREQ rtmp = NOREQ; /* Current request to abort */
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int ns; /* Number of bytes actually sent */
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if(req && (req->status != ARDP_STATUS_ACTIVE)) return(ARDP_BAD_REQ);
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if(req) rtmp = req;
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else rtmp = ardp_activeQ;
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ptmp = ardp_ptalloc();
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/* Add header */
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ptmp->start -= 13;
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ptmp->length += 13;
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*(ptmp->start) = (char) 13;
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/* An unsequenced control packet */
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bzero(ptmp->start+3,10);
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/* Cancel flag */
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*(ptmp->start+12) = 0x01;
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while(rtmp) {
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bcopy2(&(rtmp->cid),ptmp->start+1);
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if (pfs_debug >= 6) {
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if(rtmp->peer.sin_family == AF_INET)
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fprintf(stderr,"\nSending abort message (cid=%d) to %s(%d)...",
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ntohs(rtmp->cid),inet_ntoa(rtmp->peer_addr),PEER_PORT(rtmp));
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else fprintf(stderr,"\nSending abort message...");
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(void) fflush(stderr);
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}
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ns = sendto(ardp_port,(char *)(ptmp->start), ptmp->length, 0,
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&(rtmp->peer), S_AD_SZ);
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if(ns != ptmp->length) {
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if (pfs_debug) {
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fprintf(stderr,"\nsent only %d/%d: ",ns, ptmp->length);
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perror("");
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}
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ardp_ptfree(ptmp);
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return(ARDP_NOT_SENT);
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}
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if (pfs_debug >= 6) fprintf(stderr,"Sent.\n");
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rtmp->status = ARDP_STATUS_ABORTED;
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EXTRACT_ITEM(rtmp,ardp_activeQ);
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--ardp_activeQ_len;
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if(req) rtmp = NOREQ;
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else rtmp = rtmp->next;
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}
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ardp_ptfree(ptmp);
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return(ARDP_SUCCESS);
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}
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/*
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* ardp_trap_int - signal handler to abort request on ^C
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*/
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SIGNAL_RET_TYPE ardp_trap_int()
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{
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ardp_abort(NOREQ);
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exit(1);
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}
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/*
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* ardp_abort_on_int - set up signal handler to abort request on ^C
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*/
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int
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ardp_abort_on_int()
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{
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signal(SIGINT,ardp_trap_int);
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return(ARDP_SUCCESS);
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}
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