LCOM1920-T02G10

/*        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 */