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