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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
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20 if (c->read->pending_eof) {
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21 c->read->ready = 0;
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22 return 0;
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23 }
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24
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25 total = 0;
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26
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27 while (cl) {
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28
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29 /* we can post the single aio operation only */
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30
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31 if (!c->read->ready) {
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32 return total ? total : NGX_AGAIN;
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33 }
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34
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35 buf = cl->buf->last;
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36 prev = cl->buf->last;
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37 size = 0;
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38
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39 /* coalesce the neighbouring bufs */
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40
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41 while (cl && prev == cl->buf->last) {
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42 size += cl->buf->end - cl->buf->last;
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43 prev = cl->buf->end;
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44 cl = cl->next;
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45 }
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46
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47 n = ngx_aio_read(c, buf, size);
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48
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49 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n);
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50
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51 if (n == NGX_AGAIN) {
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52 return total ? total : NGX_AGAIN;
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53 }
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54
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55 if (n == NGX_ERROR) {
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56 return NGX_ERROR;
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57 }
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58
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59 if (n == 0) {
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60 c->read->pending_eof = 1;
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61 if (total) {
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62 c->read->eof = 0;
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63 c->read->ready = 1;
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64 }
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65 return total;
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66 }
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67
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68 if (n > 0) {
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69 total += n;
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70 }
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71
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72 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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73 "aio_read total: %d", total);
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74 }
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75
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76 return total ? total : NGX_AGAIN;
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77 }
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