Mercurial > hg > nginx-vendor-current
diff src/os/unix/ngx_writev_chain.c @ 0:f0b350454894 NGINX_0_1_0
nginx 0.1.0
*) The first public version.
author | Igor Sysoev <http://sysoev.ru> |
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date | Mon, 04 Oct 2004 00:00:00 +0400 |
parents | |
children | 4b2dafa26fe2 |
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new file mode 100644 --- /dev/null +++ b/src/os/unix/ngx_writev_chain.c @@ -0,0 +1,160 @@ + +/* + * Copyright (C) Igor Sysoev + */ + + +#include <ngx_config.h> +#include <ngx_core.h> +#include <ngx_event.h> + + +#define NGX_IOVS 8 + + +ngx_chain_t *ngx_writev_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit) +{ + u_char *prev; + ssize_t n, size; + off_t send, sprev, sent; + ngx_uint_t eintr, complete; + ngx_err_t err; + ngx_array_t vec; + ngx_chain_t *cl; + ngx_event_t *wev; + struct iovec *iov, iovs[NGX_IOVS]; + + wev = c->write; + + if (!wev->ready) { + return in; + } + +#if (HAVE_KQUEUE) + + if ((ngx_event_flags & NGX_HAVE_KQUEUE_EVENT) && wev->pending_eof) { + ngx_log_error(NGX_LOG_INFO, c->log, wev->kq_errno, + "kevent() reported about an closed connection"); + + wev->error = 1; + return NGX_CHAIN_ERROR; + } + +#endif + + send = 0; + complete = 0; + + vec.elts = iovs; + vec.size = sizeof(struct iovec); + vec.nalloc = NGX_IOVS; + vec.pool = c->pool; + + for ( ;; ) { + prev = NULL; + iov = NULL; + eintr = 0; + sprev = send; + + vec.nelts = 0; + + /* create the iovec and coalesce the neighbouring bufs */ + + for (cl = in; cl && vec.nelts < IOV_MAX && send < limit; cl = cl->next) + { + if (ngx_buf_special(cl->buf)) { + continue; + } + + size = cl->buf->last - cl->buf->pos; + + if (send + size > limit) { + size = limit - send; + } + + if (prev == cl->buf->pos) { + iov->iov_len += size; + + } else { + if (!(iov = ngx_array_push(&vec))) { + return NGX_CHAIN_ERROR; + } + + iov->iov_base = (void *) cl->buf->pos; + iov->iov_len = size; + } + + prev = cl->buf->pos + size; + send += size; + } + + n = writev(c->fd, vec.elts, vec.nelts); + + if (n == -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 = n > 0 ? n : 0; + + ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, + "writev: " OFF_T_FMT, sent); + + if (send - sprev == sent) { + complete = 1; + } + + c->sent += sent; + + for (cl = in; cl && sent > 0; cl = cl->next) { + if (ngx_buf_special(cl->buf)) { + continue; + } + + if (sent == 0) { + break; + } + + size = cl->buf->last - cl->buf->pos; + + if (sent >= size) { + sent -= size; + cl->buf->pos = cl->buf->last; + + continue; + } + + cl->buf->pos += sent; + + break; + } + + if (eintr) { + continue; + } + + if (!complete) { + wev->ready = 0; + return cl; + } + + if (send >= limit || cl == NULL) { + return cl; + } + + in = cl; + } +}