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/*
* Copyright (C) 2002-2004 Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_aio.h>
#if (HAVE_KQUEUE)
#include <ngx_kqueue_module.h>
#endif
/*
* the ready data requires 3 syscalls:
* aio_write(), aio_error(), aio_return()
* the non-ready data requires 4 (kqueue) or 5 syscalls:
* aio_write(), aio_error(), notifiction, aio_error(), aio_return()
* timeout, aio_cancel(), aio_error()
*/
ssize_t ngx_aio_read(ngx_connection_t *c, u_char *buf, size_t size)
{
int n;
ngx_event_t *rev;
rev = c->read;
if (!rev->ready) {
ngx_log_error(NGX_LOG_ALERT, c->log, 0, "second aio post");
return NGX_AGAIN;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"rev->complete: %d", rev->complete);
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"aio size: %d", size);
if (!rev->complete) {
ngx_memzero(&rev->aiocb, sizeof(struct aiocb));
rev->aiocb.aio_fildes = c->fd;
rev->aiocb.aio_buf = buf;
rev->aiocb.aio_nbytes = size;
#if (HAVE_KQUEUE)
rev->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue;
rev->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
rev->aiocb.aio_sigevent.sigev_value.sigval_ptr = rev;
#endif
if (aio_read(&rev->aiocb) == -1) {
ngx_log_error(NGX_LOG_CRIT, rev->log, ngx_errno,
"aio_read() failed");
rev->error = 1;
return NGX_ERROR;
}
ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
"aio_read: #%d OK", c->fd);
rev->active = 1;
rev->ready = 0;
}
rev->complete = 0;
n = aio_error(&rev->aiocb);
if (n == -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, "aio_error() failed");
rev->error = 1;
return NGX_ERROR;
}
if (n != 0) {
if (n == NGX_EINPROGRESS) {
if (rev->ready) {
ngx_log_error(NGX_LOG_ALERT, c->log, n,
"aio_read() still in progress");
rev->ready = 0;
}
return NGX_AGAIN;
}
ngx_log_error(NGX_LOG_CRIT, c->log, n, "aio_read() failed");
rev->error = 1;
rev->ready = 0;
return NGX_ERROR;
}
n = aio_return(&rev->aiocb);
if (n == -1) {
ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno,
"aio_return() failed");
rev->error = 1;
rev->ready = 0;
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, rev->log, 0,
"aio_read: #%d %d", c->fd, n);
if (n == 0) {
rev->eof = 1;
rev->ready = 0;
} else {
rev->ready = 1;
}
rev->active = 0;
return n;
}
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