annotate src/os/unix/ngx_aio_read_chain.c @ 662:e5fa0a4a7d27 NGINX_1_1_15

nginx 1.1.15 *) Feature: the "disable_symlinks" directive. *) Feature: the "proxy_cookie_domain" and "proxy_cookie_path" directives. *) Bugfix: nginx might log incorrect error "upstream prematurely closed connection" instead of correct "upstream sent too big header" one. Thanks to Feibo Li. *) Bugfix: nginx could not be built with the ngx_http_perl_module if the --with-openssl option was used. *) Bugfix: internal redirects to named locations were not limited. *) Bugfix: calling $r->flush() multiple times might cause errors in the ngx_http_gzip_filter_module. *) Bugfix: temporary files might be not removed if the "proxy_store" directive were used with SSI includes. *) Bugfix: in some cases non-cacheable variables (such as the $args variable) returned old empty cached value. *) Bugfix: a segmentation fault might occur in a worker process if too many SSI subrequests were issued simultaneously; the bug had appeared in 0.7.25.
author Igor Sysoev <http://sysoev.ru>
date Wed, 15 Feb 2012 00:00:00 +0400
parents d0f7a625f27c
children
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 * Copyright (C) Nginx, Inc.
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5 */
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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13 ssize_t
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14 ngx_aio_read_chain(ngx_connection_t *c, ngx_chain_t *cl)
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15 {
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16 int n;
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17 u_char *buf, *prev;
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18 size_t size;
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19 ssize_t total;
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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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26 total = 0;
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28 while (cl) {
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30 /* we can post the single aio operation only */
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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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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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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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48 n = ngx_aio_read(c, buf, size);
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50 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "aio_read: %d", n);
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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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56 if (n == NGX_ERROR) {
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57 return NGX_ERROR;
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58 }
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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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69 if (n > 0) {
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70 total += n;
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71 }
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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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77 return total ? total : NGX_AGAIN;
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78 }