| |
| /* |
| * Copyright (C) Igor Sysoev |
| * Copyright (C) Nginx, Inc. |
| */ |
| |
| |
| #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() for the file parts below 2G only, |
| * see src/os/unix/ngx_linux_config.h |
| * |
| * Linux 2.4.21 has the new sendfile64() syscall #239. |
| * |
| * On Linux up to 2.6.16 sendfile() does not allow to pass the count parameter |
| * more than 2G-1 bytes even on 64-bit platforms: it returns EINVAL, |
| * so we limit it to 2G-1 bytes. |
| */ |
| |
| #define NGX_SENDFILE_LIMIT 2147483647L |
| |
| |
| #if (IOV_MAX > 64) |
| #define NGX_HEADERS 64 |
| #else |
| #define NGX_HEADERS IOV_MAX |
| #endif |
| |
| |
| ngx_chain_t * |
| ngx_linux_sendfile_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) |
| { |
| int rc, tcp_nodelay; |
| off_t size, send, prev_send, aligned, sent, fprev; |
| u_char *prev; |
| size_t file_size; |
| ngx_err_t err; |
| ngx_buf_t *file; |
| ngx_uint_t eintr, complete; |
| ngx_array_t header; |
| ngx_event_t *wev; |
| ngx_chain_t *cl; |
| struct iovec *iov, headers[NGX_HEADERS]; |
| #if (NGX_HAVE_SENDFILE64) |
| off_t offset; |
| #else |
| int32_t offset; |
| #endif |
| |
| wev = c->write; |
| |
| if (!wev->ready) { |
| return in; |
| } |
| |
| |
| /* the maximum limit size is 2G-1 - the page size */ |
| |
| if (limit == 0 || limit > (off_t) (NGX_SENDFILE_LIMIT - ngx_pagesize)) { |
| limit = NGX_SENDFILE_LIMIT - ngx_pagesize; |
| } |
| |
| |
| send = 0; |
| |
| header.elts = headers; |
| header.size = sizeof(struct iovec); |
| header.nalloc = NGX_HEADERS; |
| header.pool = c->pool; |
| |
| for ( ;; ) { |
| file = NULL; |
| file_size = 0; |
| eintr = 0; |
| complete = 0; |
| prev_send = send; |
| |
| header.nelts = 0; |
| |
| prev = NULL; |
| iov = NULL; |
| |
| /* create the iovec and coalesce the neighbouring bufs */ |
| |
| for (cl = in; cl && send < limit; cl = cl->next) { |
| |
| if (ngx_buf_special(cl->buf)) { |
| continue; |
| } |
| |
| #if 1 |
| if (!ngx_buf_in_memory(cl->buf) && !cl->buf->in_file) { |
| ngx_log_error(NGX_LOG_ALERT, c->log, 0, |
| "zero size buf in sendfile " |
| "t:%d r:%d f:%d %p %p-%p %p %O-%O", |
| cl->buf->temporary, |
| cl->buf->recycled, |
| cl->buf->in_file, |
| cl->buf->start, |
| cl->buf->pos, |
| cl->buf->last, |
| cl->buf->file, |
| cl->buf->file_pos, |
| cl->buf->file_last); |
| |
| ngx_debug_point(); |
| |
| return NGX_CHAIN_ERROR; |
| } |
| #endif |
| |
| if (!ngx_buf_in_memory_only(cl->buf)) { |
| break; |
| } |
| |
| size = cl->buf->last - cl->buf->pos; |
| |
| if (send + size > limit) { |
| size = limit - send; |
| } |
| |
| if (prev == cl->buf->pos) { |
| iov->iov_len += (size_t) size; |
| |
| } else { |
| if (header.nelts >= IOV_MAX) { |
| break; |
| } |
| |
| iov = ngx_array_push(&header); |
| if (iov == NULL) { |
| return NGX_CHAIN_ERROR; |
| } |
| |
| iov->iov_base = (void *) cl->buf->pos; |
| iov->iov_len = (size_t) size; |
| } |
| |
| prev = cl->buf->pos + (size_t) size; |
| send += size; |
| } |
| |
| /* 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) |
| { |
| /* the TCP_CORK and TCP_NODELAY are mutually exclusive */ |
| |
| if (c->tcp_nodelay == NGX_TCP_NODELAY_SET) { |
| |
| tcp_nodelay = 0; |
| |
| if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY, |
| (const void *) &tcp_nodelay, sizeof(int)) == -1) |
| { |
| err = ngx_errno; |
| |
| /* |
| * there is a tiny chance to be interrupted, however, |
| * we continue a processing with the TCP_NODELAY |
| * and without the TCP_CORK |
| */ |
| |
| if (err != NGX_EINTR) { |
| wev->error = 1; |
| ngx_connection_error(c, err, |
| "setsockopt(TCP_NODELAY) failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| |
| } else { |
| c->tcp_nodelay = NGX_TCP_NODELAY_UNSET; |
| |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0, |
| "no tcp_nodelay"); |
| } |
| } |
| |
| if (c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) { |
| |
| 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"); |
| } |
| } |
| } |
| |
| /* get the file buf */ |
| |
| if (header.nelts == 0 && cl && cl->buf->in_file && send < limit) { |
| file = cl->buf; |
| |
| /* coalesce the neighbouring file bufs */ |
| |
| do { |
| size = cl->buf->file_last - cl->buf->file_pos; |
| |
| if (send + size > limit) { |
| size = limit - send; |
| |
| aligned = (cl->buf->file_pos + size + ngx_pagesize - 1) |
| & ~((off_t) ngx_pagesize - 1); |
| |
| if (aligned <= cl->buf->file_last) { |
| size = aligned - cl->buf->file_pos; |
| } |
| } |
| |
| file_size += (size_t) size; |
| send += size; |
| fprev = cl->buf->file_pos + size; |
| cl = cl->next; |
| |
| } while (cl |
| && cl->buf->in_file |
| && send < limit |
| && file->file->fd == cl->buf->file->fd |
| && fprev == cl->buf->file_pos); |
| } |
| |
| if (file) { |
| #if 1 |
| if (file_size == 0) { |
| ngx_debug_point(); |
| return NGX_CHAIN_ERROR; |
| } |
| #endif |
| #if (NGX_HAVE_SENDFILE64) |
| offset = file->file_pos; |
| #else |
| offset = (int32_t) file->file_pos; |
| #endif |
| |
| ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, |
| "sendfile: @%O %uz", file->file_pos, file_size); |
| |
| rc = sendfile(c->fd, file->file->fd, &offset, file_size); |
| |
| if (rc == -1) { |
| err = ngx_errno; |
| |
| switch (err) { |
| case NGX_EAGAIN: |
| break; |
| |
| case NGX_EINTR: |
| eintr = 1; |
| break; |
| |
| default: |
| wev->error = 1; |
| ngx_connection_error(c, err, "sendfile() failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
| "sendfile() is not ready"); |
| } |
| |
| sent = rc > 0 ? rc : 0; |
| |
| ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, |
| "sendfile: %d, @%O %O:%uz", |
| rc, file->file_pos, sent, file_size); |
| |
| } else { |
| rc = writev(c->fd, header.elts, header.nelts); |
| |
| if (rc == -1) { |
| err = ngx_errno; |
| |
| switch (err) { |
| case NGX_EAGAIN: |
| break; |
| |
| case NGX_EINTR: |
| eintr = 1; |
| break; |
| |
| default: |
| wev->error = 1; |
| ngx_connection_error(c, err, "writev() failed"); |
| return NGX_CHAIN_ERROR; |
| } |
| |
| ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, |
| "writev() not ready"); |
| } |
| |
| sent = rc > 0 ? rc : 0; |
| |
| ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "writev: %O", sent); |
| } |
| |
| if (send - prev_send == sent) { |
| complete = 1; |
| } |
| |
| 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 += (size_t) sent; |
| } |
| |
| if (cl->buf->in_file) { |
| cl->buf->file_pos += sent; |
| } |
| |
| break; |
| } |
| |
| if (eintr) { |
| continue; |
| } |
| |
| if (!complete) { |
| wev->ready = 0; |
| return cl; |
| } |
| |
| if (send >= limit || cl == NULL) { |
| return cl; |
| } |
| |
| in = cl; |
| } |
| } |