Mercurial > hg > nginx
view src/os/unix/ngx_readv_chain.c @ 6339:67422a0a8ed2 stable-1.8
Events: made a failure to create a notification channel non-fatal.
This may happen if eventfd() returns ENOSYS, notably seen on CentOS 5.4.
Such a failure will now just disable the notification mechanism and let
the callers cope with it, instead of failing to start worker processes.
If thread pools are not configured, this can safely be ignored.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Wed, 06 May 2015 17:04:00 +0300 |
parents | ec81934727a1 |
children | f01ab2dbcfdc |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> ssize_t ngx_readv_chain(ngx_connection_t *c, ngx_chain_t *chain, off_t limit) { 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_PREALLOCATE]; rev = c->read; #if (NGX_HAVE_KQUEUE) 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; } } } #endif prev = NULL; iov = NULL; size = 0; vec.elts = iovs; vec.nelts = 0; vec.size = sizeof(struct iovec); vec.nalloc = NGX_IOVS_PREALLOCATE; vec.pool = c->pool; /* coalesce the neighbouring bufs */ while (chain) { n = chain->buf->end - chain->buf->last; if (limit) { if (size >= limit) { break; } if (size + n > limit) { n = (ssize_t) (limit - size); } } if (prev == chain->buf->last) { iov->iov_len += n; } 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 = n; } size += n; 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); do { n = readv(c->fd, (struct iovec *) vec.elts, vec.nelts); if (n >= 0) { #if (NGX_HAVE_KQUEUE) 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->ready = 0; rev->eof = 1; rev->available = 0; } return n; } #endif /* NGX_HAVE_KQUEUE */ if (n < size && !(ngx_event_flags & NGX_USE_GREEDY_EVENT)) { 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; }