Mercurial > hg > nginx
annotate src/os/unix/ngx_udp_recv.c @ 7948:a2613fc1bce5
Fixed sendfile() limit handling on Linux.
On Linux starting with 2.6.16, sendfile() silently limits all operations
to MAX_RW_COUNT, defined as (INT_MAX & PAGE_MASK). This incorrectly
triggered the interrupt check, and resulted in 0-sized writev() on the
next loop iteration.
Fix is to make sure the limit is always checked, so we will return from
the loop if the limit is already reached even if number of bytes sent is
not exactly equal to the number of bytes we've tried to send.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Fri, 29 Oct 2021 20:21:51 +0300 |
parents | 5ad379eab6fa |
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rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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7 |
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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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12 |
1680 | 13 ssize_t |
1689 | 14 ngx_udp_unix_recv(ngx_connection_t *c, u_char *buf, size_t size) |
91
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15 { |
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16 ssize_t n; |
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17 ngx_err_t err; |
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18 ngx_event_t *rev; |
91
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20 rev = c->read; |
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22 do { |
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23 n = recv(c->fd, buf, size, 0); |
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25 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, |
6480 | 26 "recv: fd:%d %z of %uz", c->fd, n, size); |
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28 if (n >= 0) { |
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29 |
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30 #if (NGX_HAVE_KQUEUE) |
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455 | 32 if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { |
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33 rev->available -= n; |
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34 |
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35 /* |
583 | 36 * rev->available may be negative here because some additional |
587 | 37 * bytes may be received between kevent() and recv() |
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38 */ |
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39 |
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40 if (rev->available <= 0) { |
1689 | 41 rev->ready = 0; |
605 | 42 rev->available = 0; |
43 } | |
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44 } |
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45 |
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46 #endif |
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47 |
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48 return n; |
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49 } |
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50 |
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51 err = ngx_socket_errno; |
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52 |
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53 if (err == NGX_EAGAIN || err == NGX_EINTR) { |
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54 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
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55 "recv() not ready"); |
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56 n = NGX_AGAIN; |
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57 |
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58 } else { |
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59 n = ngx_connection_error(c, err, "recv() failed"); |
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60 break; |
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61 } |
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62 |
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63 } while (err == NGX_EINTR); |
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64 |
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65 rev->ready = 0; |
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66 |
3642 | 67 if (n == NGX_ERROR) { |
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68 rev->error = 1; |
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69 } |
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70 |
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71 return n; |
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72 } |