Mercurial > hg > nginx-quic
view src/os/unix/ngx_readv_chain.c @ 4749:613750237b36
Entity tags: the "etag" directive.
It allows to disable generation of nginx's own entity tags, while
still handling ETags in cache properly. This may be useful e.g.
if one want to serve static files from servers with different ETag
generation algorithms.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 09 Jul 2012 14:53:42 +0000 |
parents | 4be36d5e78ae |
children | 13c006f0c40e |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #define NGX_IOVS 16 #if (NGX_HAVE_KQUEUE) ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain) { u_char *prev; ssize_t n, size; ngx_err_t err; ngx_array_t vec; ngx_event_t *rev; struct iovec *iov, iovs[NGX_IOVS]; rev = c->read; if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0, "readv: eof:%d, avail:%d, err:%d", rev->pending_eof, rev->available, rev->kq_errno); if (rev->available == 0) { if (rev->pending_eof) { rev->ready = 0; rev->eof = 1; ngx_log_error(NGX_LOG_INFO, c->log, rev->kq_errno, "kevent() reported about an closed connection"); if (rev->kq_errno) { rev->error = 1; ngx_set_socket_errno(rev->kq_errno); return NGX_ERROR; } return 0; } else { return NGX_AGAIN; } } } prev = NULL; iov = NULL; size = 0; vec.elts = iovs; vec.nelts = 0; vec.size = sizeof(struct iovec); vec.nalloc = NGX_IOVS; vec.pool = c->pool; /* coalesce the neighbouring bufs */ while (chain) { if (prev == chain->buf->last) { iov->iov_len += chain->buf->end - chain->buf->last; } else { if (vec.nelts >= IOV_MAX) { break; } iov = ngx_array_push(&vec); if (iov == NULL) { return NGX_ERROR; } iov->iov_base = (void *) chain->buf->last; iov->iov_len = chain->buf->end - chain->buf->last; } size += chain->buf->end - chain->buf->last; prev = chain->buf->end; chain = chain->next; } ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, "readv: %d, last:%d", vec.nelts, iov->iov_len); rev = c->read; do { n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); if (n >= 0) { if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { rev->available -= n; /* * rev->available may be negative here because some additional * bytes may be received between kevent() and recv() */ if (rev->available <= 0) { if (!rev->pending_eof) { rev->ready = 0; } if (rev->available < 0) { rev->available = 0; } } if (n == 0) { /* * on FreeBSD recv() may return 0 on closed socket * even if kqueue reported about available data */ #if 0 ngx_log_error(NGX_LOG_ALERT, c->log, 0, "readv() returned 0 while kevent() reported " "%d available bytes", rev->available); #endif rev->eof = 1; rev->available = 0; } return n; } if (n < size) { rev->ready = 0; } if (n == 0) { rev->eof = 1; } return n; } err = ngx_socket_errno; if (err == NGX_EAGAIN || err == NGX_EINTR) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, "readv() not ready"); n = NGX_AGAIN; } else { n = ngx_connection_error(c, err, "readv() failed"); break; } } while (err == NGX_EINTR); rev->ready = 0; if (n == NGX_ERROR) { c->read->error = 1; } return n; } #else /* ! NGX_HAVE_KQUEUE */ ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain) { u_char *prev; ssize_t n, size; ngx_err_t err; ngx_array_t vec; ngx_event_t *rev; struct iovec *iov, iovs[NGX_IOVS]; prev = NULL; iov = NULL; size = 0; vec.elts = iovs; vec.nelts = 0; vec.size = sizeof(struct iovec); vec.nalloc = NGX_IOVS; vec.pool = c->pool; /* coalesce the neighbouring bufs */ while (chain) { if (prev == chain->buf->last) { iov->iov_len += chain->buf->end - chain->buf->last; } else { if (vec.nelts >= IOV_MAX) { break; } iov = ngx_array_push(&vec); if (iov == NULL) { return NGX_ERROR; } iov->iov_base = (void *) chain->buf->last; iov->iov_len = chain->buf->end - chain->buf->last; } size += chain->buf->end - chain->buf->last; prev = chain->buf->end; chain = chain->next; } ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0, "readv: %d:%d", vec.nelts, iov->iov_len); rev = c->read; do { n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); if (n == 0) { rev->ready = 0; rev->eof = 1; return n; } else if (n > 0) { if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { rev->ready = 0; } return n; } err = ngx_socket_errno; if (err == NGX_EAGAIN || err == NGX_EINTR) { ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, err, "readv() not ready"); n = NGX_AGAIN; } else { n = ngx_connection_error(c, err, "readv() failed"); break; } } while (err == NGX_EINTR); rev->ready = 0; if (n == NGX_ERROR) { c->read->error = 1; } return n; } #endif /* NGX_HAVE_KQUEUE */