101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
#ifndef lint
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static char sccsid[] = "@(#)ctl_transact.c 1.1 92/07/30 SMI"; /* from UCB */
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#endif
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#include "talk_ctl.h"
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#include <sys/time.h>
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#define CTL_WAIT 2 /* the amount of time to wait for a
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response, in seconds */
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/*
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* SOCKDGRAM is unreliable, so we must repeat messages if we have
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* not recieved an acknowledgement within a reasonable amount
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* of time
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*/
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ctl_transact(target, msg, type, response)
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struct in_addr target;
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CTL_MSG msg;
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int type;
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CTL_RESPONSE *response;
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{
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struct sockaddr junk;
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int read_mask;
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int ctl_mask;
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int nready;
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int cc;
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int junk_size;
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struct timeval wait;
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wait.tv_sec = CTL_WAIT;
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wait.tv_usec = 0;
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msg.type = type;
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daemon_addr.sin_addr = target;
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daemon_addr.sin_port = daemon_port;
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ctl_mask = 1 << ctl_sockt;
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/*
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* keep sending the message until a response of the right
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* type is obtained
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*/
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do {
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/* keep sending the message until a response is obtained */
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do {
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cc = sendto(ctl_sockt, (char *)&msg, sizeof(CTL_MSG), 0,
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&daemon_addr, sizeof(daemon_addr));
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if (cc != sizeof(CTL_MSG)) {
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if (errno == EINTR) {
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/* we are returning from an interupt */
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continue;
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} else {
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p_error("Error on write to talk daemon");
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}
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}
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read_mask = ctl_mask;
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while ((nready = select(32, &read_mask, 0, 0, &wait)) < 0) {
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if (errno == EINTR) {
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/* we are returning from an interupt */
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continue;
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} else {
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p_error("Error on waiting for response from daemon");
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}
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}
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} while (nready == 0);
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/* keep reading while there are queued messages
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(this is not necessary, it just saves extra
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request/acknowledgements being sent)
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*/
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do {
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junk_size = sizeof(junk);
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cc = recvfrom(ctl_sockt, (char *) response,
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sizeof(CTL_RESPONSE), 0, &junk, &junk_size );
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if (cc < 0) {
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if (errno == EINTR) {
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continue;
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}
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p_error("Error on read from talk daemon");
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}
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read_mask = ctl_mask;
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/* an immediate poll */
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timerclear(&wait);
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nready = select(32, &read_mask, 0, 0, &wait);
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} while ( nready > 0 && response->type != type);
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} while (response->type != type);
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}
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