9ba65d2ea8
model to an instance-based model. Each ethernet driver instance is now responsible for exactly one network interface card. The port field in /etc/inet.conf now acts as an instance field instead. This patch also updates the data link protocol. This update: - eliminates the concept of ports entirely; - eliminates DL_GETNAME entirely; - standardizes on using m_source for IPC and DL_ENDPT for safecopies; - removes error codes from TASK/STAT replies, as they were unused; - removes a number of other old or unused fields; - names and renames a few other fields. All ethernet drivers have been changed to: - conform to the new protocol, and exactly that; - take on an instance number based on a given "instance" argument; - skip that number of PCI devices in probe iterations; - use config tables and environment variables based on that number; - no longer be limited to a predefined maximum of cards in any way; - get rid of any leftover non-safecopy support and other ancient junk; - have a correct banner protocol figure, or none at all. Other changes: * Inet.conf is now taken to be line-based, and supports #-comments. No existing installations are expected to be affected by this. * A new, select-based asynchio library replaces the old one. Kindly contributed by Kees J. Bot. * Inet now supports use of select() on IP devices. Combined, the last two changes together speed up dhcpd considerably in the presence of multiple interfaces. * A small bug has been fixed in nonamed.
119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
/* asyn_wait() - wait for asynch operations Author: Kees J. Bot
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* 7 Jul 1997
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*/
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#define DEBUG 0
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#include "asyn.h"
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#include <time.h>
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#if DEBUG
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#include <stdio.h>
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#endif
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#define TBOUND_MIN 1
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#define TBOUND_MAX 16
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int asyn_wait(asynchio_t *asyn, int flags, struct timeval *to)
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/* Wait for one or more nonblocking operations to return a result. */
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{
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int r;
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static struct timeval zero_time;
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struct timeval t;
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static time_t tbound= TBOUND_MIN;
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/* Are there more things to do before we can block? */
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if (asyn->asyn_more > 0) { asyn->asyn_more= 0; return 0; }
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if (flags & ASYN_NONBLOCK) {
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/* Don't block by using a zero second timeout. */
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to= &zero_time;
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} else
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if (to != nil) {
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/* asyn_wait() uses an absolute time. */
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if (to->tv_usec >= 1000000L) {
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to->tv_sec+= to->tv_usec / 1000000L;
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to->tv_usec%= 1000000L;
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}
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(void) gettimeofday(&t, nil);
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if (t.tv_sec > to->tv_sec || (t.tv_sec == to->tv_sec
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&& t.tv_usec >= to->tv_usec)) {
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to= &zero_time;
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} else {
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t.tv_sec= to->tv_sec - t.tv_sec;
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t.tv_usec= to->tv_usec - t.tv_usec;
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if (t.tv_usec < 0) {
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t.tv_sec--;
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t.tv_usec+= 1000000L;
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}
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to= &t;
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}
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/* Don't sleep too long, we don't trust select(). */
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if (to->tv_sec > tbound) goto bound;
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} else {
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bound:
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/* No timeout? Don't hang in (buggy?) select() forever. */
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to= &t;
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t.tv_sec= tbound;
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t.tv_usec= 0;
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}
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#if DEBUG
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{
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int op;
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fprintf(stderr, "select: ");
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for (op= 0; op < SEL_NR; op++) {
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fd_set *fdsetp= &asyn->asyn_fdset[op];
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int fd;
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for (fd= 0; fd < FD_SETSIZE; fd++) {
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if (FD_ISSET(fd, fdsetp)) {
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asyn->asyn_afd[fd].afd_state[op]=
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PENDING;
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fprintf(stderr, "%d%c", fd, "rwx"[op]);
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}
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}
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}
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fflush(stderr);
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}
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#endif
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r= select(FD_SETSIZE, &asyn->asyn_fdset[SEL_READ],
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&asyn->asyn_fdset[SEL_WRITE],
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&asyn->asyn_fdset[SEL_EXCEPT], to);
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#if DEBUG
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fprintf(stderr, " (%d) ", r);
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#endif
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if (r > 0) {
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/* An event occurred on one or more file descriptors. */
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int op;
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for (op= 0; op < SEL_NR; op++) {
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fd_set *fdsetp= &asyn->asyn_fdset[op];
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int fd;
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for (fd= 0; fd < FD_SETSIZE; fd++) {
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if (FD_ISSET(fd, fdsetp)) {
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asyn->asyn_afd[fd].afd_state[op]=
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PENDING;
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#if DEBUG
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fprintf(stderr, "%d%c", fd, "rwx"[op]);
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#endif
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}
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}
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}
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tbound= TBOUND_MIN;
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} else
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if (r == 0) {
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/* If nothing happened then let the time boundary slip a bit. */
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if (tbound < TBOUND_MAX) tbound <<= 1;
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}
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#if DEBUG
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fputc('\n', stderr);
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#endif
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FD_ZERO(&asyn->asyn_fdset[SEL_READ]);
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FD_ZERO(&asyn->asyn_fdset[SEL_WRITE]);
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FD_ZERO(&asyn->asyn_fdset[SEL_EXCEPT]);
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return r == 0 ? (errno= EINTR, -1) : r;
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}
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