Mercurial > hg > nginx-quic
view src/os/unix/ngx_linux_sendfile_chain.c @ 344:e366ba5db8f8
nginx-0.0.3-2004-06-01-10:04:46 import
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 01 Jun 2004 06:04:46 +0000 |
parents | 6bdf858bff8c |
children | 7650aea1816f |
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/* * Copyright (C) 2002-2004 Igor Sysoev, http://sysoev.ru/en/ */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> /* * On Linux up to 2.4.21 sendfile() (syscall #187) works with 32-bit * offsets only and the including <sys/sendfile.h> breaks the compiling * if off_t is 64 bit wide. So we use own sendfile() definition where offset * parameter is int32_t and use sendfile() with the file parts below 2G. * * Linux 2.4.21 has a new sendfile64() syscall #239. */ ngx_chain_t *ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in) { int rc; u_char *prev; off_t fprev; size_t size, fsize, sent; ngx_int_t eintr; struct iovec *iov; ngx_err_t err; ngx_buf_t *file; ngx_array_t header; ngx_event_t *wev; ngx_chain_t *cl, *tail; #if (HAVE_SENDFILE64) off_t offset; #else int32_t offset; #endif wev = c->write; if (!wev->ready) { return in; } do { file = NULL; fsize = 0; eintr = 0; ngx_init_array(header, c->pool, 10, sizeof(struct iovec), NGX_CHAIN_ERROR); prev = NULL; iov = NULL; /* create the iovec and coalesce the neighbouring bufs */ for (cl = in; cl && header.nelts < IOV_MAX; cl = cl->next) { if (ngx_buf_special(cl->buf)) { continue; } if (!ngx_buf_in_memory_only(cl->buf)) { break; } if (prev == cl->buf->pos) { iov->iov_len += cl->buf->last - cl->buf->pos; } else { ngx_test_null(iov, ngx_push_array(&header), NGX_CHAIN_ERROR); iov->iov_base = (void *) cl->buf->pos; iov->iov_len = cl->buf->last - cl->buf->pos; } prev = cl->buf->last; } /* set TCP_CORK if there is a header before a file */ if (c->tcp_nopush == NGX_TCP_NOPUSH_UNSET && header.nelts != 0 && cl && cl->buf->in_file) { if (ngx_tcp_nopush(c->fd) == NGX_ERROR) { err = ngx_errno; /* * there is a tiny chance to be interrupted, however * we continue a processing without the TCP_CORK */ if (err != NGX_EINTR) { wev->error = 1; ngx_connection_error(c, err, ngx_tcp_nopush_n " failed"); return NGX_CHAIN_ERROR; } } else { c->tcp_nopush = NGX_TCP_NOPUSH_SET; ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, "tcp_nopush"); } } if (header.nelts == 0 && cl && cl->buf->in_file) { /* get the file buf */ file = cl->buf; fsize = (size_t) (file->file_last - file->file_pos); fprev = file->file_last; cl = cl->next; /* coalesce the neighbouring file bufs */ while (cl && (cl->buf->in_file)) { if (file->file->fd != cl->buf->file->fd || fprev != cl->buf->file_pos) { break; } fsize += (size_t) (cl->buf->file_last - cl->buf->file_pos); fprev = cl->buf->file_last; cl = cl->next; } } /* * the tail is the rest of the chain that exceedes * a single sendfile() capability */ tail = cl; if (fsize) { #if (HAVE_SENDFILE64) offset = file->file_pos; #else offset = (int32_t) file->file_pos; #endif rc = sendfile(c->fd, file->file->fd, &offset, fsize); if (rc == -1) { err = ngx_errno; if (err == NGX_EAGAIN || err == NGX_EINTR) { if (err == NGX_EINTR) { eintr = 1; } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, "sendfile() is not ready"); } else { wev->error = 1; ngx_connection_error(c, err, "sendfile() failed"); return NGX_CHAIN_ERROR; } } sent = rc > 0 ? rc : 0; ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, "sendfile: %d, @" OFF_T_FMT " %d:%d", rc, file->file_pos, sent, fsize); } else { rc = writev(c->fd, header.elts, header.nelts); if (rc == -1) { err = ngx_errno; if (err == NGX_EAGAIN || err == NGX_EINTR) { if (err == NGX_EINTR) { eintr = 1; } ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, "writev() not ready"); } else { wev->error = 1; ngx_connection_error(c, err, "writev() failed"); return NGX_CHAIN_ERROR; } } sent = rc > 0 ? rc : 0; ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %d", sent); } c->sent += sent; for (cl = in; cl; cl = cl->next) { if (ngx_buf_special(cl->buf)) { continue; } if (sent == 0) { break; } size = ngx_buf_size(cl->buf); if (sent >= size) { sent -= size; if (ngx_buf_in_memory(cl->buf)) { cl->buf->pos = cl->buf->last; } if (cl->buf->in_file) { cl->buf->file_pos = cl->buf->file_last; } continue; } if (ngx_buf_in_memory(cl->buf)) { cl->buf->pos += sent; } if (cl->buf->in_file) { cl->buf->file_pos += sent; } break; } in = cl; /* "tail == in" means that a single sendfile() is complete */ } while ((tail && tail == in) || eintr); if (in) { wev->ready = 0; } return in; }