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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_aio.h>
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11
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12
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13 ssize_t ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl)
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14 {
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15 int n;
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16 u_char *buf, *prev;
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17 size_t size;
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18 ssize_t total;
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19 ngx_err_t err;
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20
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21 if (c->read->pending_eof) {
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22 c->read->ready = 0;
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23 return 0;
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24 }
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25
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26 total = 0;
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27
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28 while (cl) {
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29
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30 /* we can post the single aio operation only */
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31
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32 if (!c->read->ready) {
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33 return total ? total : NGX_AGAIN;
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34 }
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35
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36 buf = cl->buf->last;
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37 prev = cl->buf->last;
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38 size = 0;
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39
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40 /* coalesce the neighbouring bufs */
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41
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42 while (cl && prev == cl->buf->last) {
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43 size += cl->buf->end - cl->buf->last;
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44 prev = cl->buf->end;
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45 cl = cl->next;
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46 }
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47
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48 n = ngx_aio_read(c, buf, size);
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49
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50 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n);
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51
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52 if (n == NGX_AGAIN) {
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53 return total ? total : NGX_AGAIN;
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54 }
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55
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56 if (n == NGX_ERROR) {
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57 return NGX_ERROR;
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58 }
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59
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60 if (n == 0) {
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61 c->read->pending_eof = 1;
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62 if (total) {
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63 c->read->eof = 0;
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64 c->read->ready = 1;
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65 }
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66 return total;
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67 }
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68
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69 if (n > 0) {
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70 total += n;
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71 }
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72
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73 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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74 "aio_read total: %d", total);
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75 }
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76
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77 return total ? total : NGX_AGAIN;
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78 }
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