minix/include/sys/asynchio.h
David van Moolenbroek 9ba65d2ea8 This patch switches the MINIX3 ethernet driver stack from a port-based
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.
2010-05-17 22:22:53 +00:00

43 lines
1.5 KiB
C

/* asynchio.h - Asynchronous I/O Author: Kees J. Bot
* 7 Jul 1997
* Minix-vmd compatible asynchio(3) using BSD select(2).
*/
#ifndef _SYS__ASYNCHIO_H
#define _SYS__ASYNCHIO_H
#include <sys/select.h> /* for FD_SETSIZE */
#define SEL_READ 0 /* Code for a read. */
#define SEL_WRITE 1 /* Code for a write. */
#define SEL_EXCEPT 2 /* Code for some exception. */
#define SEL_NR 3 /* Number of codes. */
struct _asynfd {
int afd_seen; /* Set if we manage this descriptor. */
int afd_flags; /* File flags by fcntl(fd, F_GETFL). */
int afd_state[SEL_NR]; /* Operation state. */
};
typedef struct {
int asyn_more; /* Set if more to do before blocking. */
struct _asynfd asyn_afd[FD_SETSIZE];
fd_set asyn_fdset[SEL_NR]; /* Select() fd sets. */
} asynchio_t;
#define ASYN_INPROGRESS EAGAIN /* Errno code telling "nothing yet." */
#define ASYN_NONBLOCK 0x01 /* If asyn_wait() mustn't block. */
struct timeval;
void asyn_init(asynchio_t *_asyn);
ssize_t asyn_read(asynchio_t *_asyn, int _fd, void *_buf, size_t _len);
ssize_t asyn_write(asynchio_t *_asyn, int _fd, const void *_buf, size_t _len);
int asyn_special(asynchio_t *_asyn, int _fd, int _op);
int asyn_result(asynchio_t *_asyn, int _fd, int _op, int _result);
int asyn_wait(asynchio_t *_asyn, int _flags, struct timeval *to);
int asyn_cancel(asynchio_t *_asyn, int _fd, int _op);
int asyn_pending(asynchio_t *_asyn, int _fd, int _op);
int asyn_synch(asynchio_t *_asyn, int _fd);
int asyn_close(asynchio_t *_asyn, int _fd);
#endif /* _SYS__ASYNCHIO_H */