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.
104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
/* asyn_special(), asyn_result() Author: Kees J. Bot
|
|
* 8 Jul 1997
|
|
*/
|
|
#include "asyn.h"
|
|
#include <signal.h>
|
|
|
|
/* Saved signal mask between asyn_special() and asyn_result(). */
|
|
static sigset_t mask;
|
|
|
|
int asyn_special(asynchio_t *asyn, int fd, int op)
|
|
/* Wait for an operation. This is an odd one out compared to asyn_read()
|
|
* and asyn_write(). It does not do an operation itself, but together with
|
|
* asyn_result() it is a set of brackets around a system call xxx that has
|
|
* no asyn_xxx() for itself. It can be used to build an asyn_accept() or
|
|
* asyn_connect() for instance. (Minix-vmd has asyn_ioctl() instead,
|
|
* which is used for any other event like TCP/IP listen/connect. BSD has
|
|
* a myriad of calls that can't be given an asyn_xxx() counterpart each.)
|
|
* Asyn_special() returns -1 for "forget it", 0 for "try it", and 1 for
|
|
* "very first call, maybe you should try it once, maybe not". Errno is
|
|
* set to EAGAIN if the result is -1 or 1. After trying the system call
|
|
* make sure errno equals EAGAIN if the call is still in progress and call
|
|
* asyn_result with the result of the system call. Asyn_result() must be
|
|
* called if asyn_special() returns 0 or 1.
|
|
*
|
|
* Example use:
|
|
*
|
|
* int asyn_accept(asynchio_t *asyn, int s, struct sockaddr *addr, int *addrlen)
|
|
* {
|
|
* int r;
|
|
* if ((r= asyn_special(asyn, fd, SEL_READ)) < 0) return -1;
|
|
* r= r == 0 ? accept(fd, addr, addrlen) : -1;
|
|
* return asyn_result(asyn, fd, SEL_READ, r);
|
|
* }
|
|
*
|
|
* int asyn_connect(asynchio_t *asyn, int s, struct sockaddr *name, int namelen)
|
|
* {
|
|
* int r;
|
|
* if ((r= asyn_special(asyn, fd, SEL_WRITE)) < 0) return -1;
|
|
* if (r == 1 && (r= connect(fd, name, namelen)) < 0) {
|
|
* if (errno == EINPROGRESS) errno= EAGAIN;
|
|
* }
|
|
* return asyn_result(asyn, fd, SEL_WRITE, r);
|
|
* }
|
|
*/
|
|
{
|
|
asynfd_t *afd;
|
|
int seen;
|
|
|
|
asyn->asyn_more++;
|
|
|
|
if ((unsigned) fd >= FD_SETSIZE) { errno= EBADF; return -1; }
|
|
afd= &asyn->asyn_afd[fd];
|
|
|
|
/* If this is the first async call on this filedescriptor then
|
|
* remember its file flags.
|
|
*/
|
|
if (!(seen= afd->afd_seen)) {
|
|
if ((afd->afd_flags= fcntl(fd, F_GETFL)) < 0) return -1;
|
|
afd->afd_seen= 1;
|
|
}
|
|
|
|
/* Try to read if I/O is pending. */
|
|
if (!seen || afd->afd_state[op] == PENDING) {
|
|
sigemptyset(&mask);
|
|
if (sigprocmask(SIG_SETMASK, &mask, &mask) < 0) return -1;
|
|
(void) fcntl(fd, F_SETFL, afd->afd_flags | O_NONBLOCK);
|
|
|
|
/* Let the caller try the system call. */
|
|
errno= EAGAIN;
|
|
return seen ? 0 : 1;
|
|
}
|
|
|
|
/* Record this read as "waiting". */
|
|
afd->afd_state[op]= WAITING;
|
|
FD_SET(fd, &asyn->asyn_fdset[op]);
|
|
errno= EAGAIN;
|
|
asyn->asyn_more--;
|
|
return -1;
|
|
}
|
|
|
|
int asyn_result(asynchio_t *asyn, int fd, int op, int result)
|
|
/* The caller has tried the system call with the given result. Finish up. */
|
|
{
|
|
int err;
|
|
asynfd_t *afd= &asyn->asyn_afd[fd];
|
|
|
|
err= errno;
|
|
|
|
(void) fcntl(fd, F_SETFL, afd->afd_flags);
|
|
(void) sigprocmask(SIG_SETMASK, &mask, nil);
|
|
|
|
errno= err;
|
|
if (result != -1 || errno != EAGAIN) {
|
|
afd->afd_state[op]= IDLE;
|
|
return result;
|
|
}
|
|
|
|
/* Record this operation as "waiting". */
|
|
afd->afd_state[op]= WAITING;
|
|
FD_SET(fd, &asyn->asyn_fdset[op]);
|
|
errno= EAGAIN;
|
|
asyn->asyn_more--;
|
|
return -1;
|
|
}
|