Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_writev_chain.c @ 184:1bf718ce0dde
nginx-0.0.1-2003-11-14-10:20:34 import
author | Igor Sysoev <igor@sysoev.ru> |
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date | Fri, 14 Nov 2003 07:20:34 +0000 |
parents | c42be4185301 |
children | 8dee38ea9117 |
rev | line source |
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93
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1 |
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2 #include <ngx_config.h> |
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3 #include <ngx_core.h> |
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4 #include <ngx_event.h> |
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5 |
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7 ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in) |
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8 { |
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9 char *prev; |
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10 ssize_t n, size; |
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11 off_t sent; |
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12 struct iovec *iov; |
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13 ngx_err_t err; |
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14 ngx_array_t io; |
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15 ngx_chain_t *cl; |
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16 |
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17 if (!c->write->ready) { |
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18 return in; |
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19 } |
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21 ngx_init_array(io, c->pool, 10, sizeof(struct iovec), NGX_CHAIN_ERROR); |
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22 |
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23 prev = NULL; |
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24 iov = NULL; |
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26 /* create the iovec and coalesce the neighbouring hunks */ |
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27 |
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28 for (cl = in; cl; cl = cl->next) { |
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29 |
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30 if (prev == cl->hunk->pos) { |
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31 iov->iov_len += cl->hunk->last - cl->hunk->pos; |
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32 prev = cl->hunk->last; |
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33 |
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34 } else { |
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35 ngx_test_null(iov, ngx_push_array(&io), NGX_CHAIN_ERROR); |
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36 iov->iov_base = cl->hunk->pos; |
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37 iov->iov_len = cl->hunk->last - cl->hunk->pos; |
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38 prev = cl->hunk->last; |
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39 } |
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40 } |
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42 n = writev(c->fd, io.elts, io.nelts); |
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43 |
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44 if (n == -1) { |
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45 err = ngx_errno; |
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46 if (err == NGX_EAGAIN) { |
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47 ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EAGAIN"); |
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48 |
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49 } else if (err == NGX_EINTR) { |
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50 ngx_log_error(NGX_LOG_INFO, c->log, err, "writev() EINTR"); |
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51 |
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52 } else { |
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53 ngx_log_error(NGX_LOG_CRIT, c->log, err, "writev() failed"); |
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54 return NGX_CHAIN_ERROR; |
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55 } |
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56 } |
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57 |
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58 sent = n > 0 ? n : 0; |
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59 |
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60 #if (NGX_DEBUG_WRITE_CHAIN) |
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61 ngx_log_debug(c->log, "writev: " OFF_FMT _ sent); |
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62 #endif |
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63 |
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64 c->sent += sent; |
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66 for (cl = in; cl && sent > 0; cl = cl->next) { |
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68 size = cl->hunk->last - cl->hunk->pos; |
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70 ngx_log_debug(c->log, "SIZE: %d" _ size); |
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71 |
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72 if (sent >= size) { |
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73 sent -= size; |
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74 |
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75 if (cl->hunk->type & NGX_HUNK_IN_MEMORY) { |
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76 cl->hunk->pos = cl->hunk->last; |
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77 } |
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78 |
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79 continue; |
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80 } |
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81 |
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82 if (cl->hunk->type & NGX_HUNK_IN_MEMORY) { |
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83 cl->hunk->pos += sent; |
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84 } |
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85 |
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86 break; |
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87 } |
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88 |
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89 return cl; |
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90 } |