Integrate TLDK with NGINX

Created a clone of nginx (from https://github.com/nginx/nginx)
to demonstrate and benchmark TLDK library integrated with real
world application.
A new nginx module is created and and BSD socket-like API is implemented
on top of native TLDK API.
Note, that right now only minimalistic subset of socket-like API is provided:
- accept
- close
- readv
- recv
- writev
so only limited nginx functionality is available for a moment.

Change-Id: Ie1efe9349a0538da4348a48fb8306cbf636b5a92
Signed-off-by: Mohammad Abdul Awal <mohammad.abdul.awal@intel.com>
Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
Signed-off-by: Remy Horton <remy.horton@intel.com>
Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

1 files changed, 167 insertions, 0 deletions

diff --git a/app/nginx/src/os/unix/ngx_recv.c b/app/nginx/src/os/unix/ngx_recv.c
new file mode 100644
index 0000000..c85fd45
--- /dev/null
+++ b/app/nginx/src/os/unix/ngx_recv.c
@@ -0,0 +1,167 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+
+
+ssize_t
+ngx_unix_recv(ngx_connection_t *c, u_char *buf, size_t size)
+{
+    ssize_t       n;
+    ngx_err_t     err;
+    ngx_event_t  *rev;
+
+    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,
+                       "recv: 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;
+
+                if (rev->kq_errno) {
+                    rev->error = 1;
+                    ngx_set_socket_errno(rev->kq_errno);
+
+                    return ngx_connection_error(c, rev->kq_errno,
+                               "kevent() reported about an closed connection");
+                }
+
+                return 0;
+
+            } else {
+                rev->ready = 0;
+                return NGX_AGAIN;
+            }
+        }
+    }
+
+#endif
+
+#if (NGX_HAVE_EPOLLRDHUP)
+
+    if (ngx_event_flags & NGX_USE_EPOLL_EVENT) {
+        ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
+                       "recv: eof:%d, avail:%d",
+                       rev->pending_eof, rev->available);
+
+        if (!rev->available && !rev->pending_eof) {
+            rev->ready = 0;
+            return NGX_AGAIN;
+        }
+    }
+
+#endif
+
+    do {
+        n = recv(c->fd, buf, size, 0);
+
+        ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
+                       "recv: fd:%d %z of %uz", c->fd, n, size);
+
+        if (n == 0) {
+            rev->ready = 0;
+            rev->eof = 1;
+
+#if (NGX_HAVE_KQUEUE)
+
+            /*
+             * on FreeBSD recv() may return 0 on closed socket
+             * even if kqueue reported about available data
+             */
+
+            if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
+                rev->available = 0;
+            }
+
+#endif
+
+            return 0;
+        }
+
+        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;
+                    }
+
+                    rev->available = 0;
+                }
+
+                return n;
+            }
+
+#endif
+
+#if (NGX_HAVE_EPOLLRDHUP)
+
+            if ((ngx_event_flags & NGX_USE_EPOLL_EVENT)
+                && ngx_use_epoll_rdhup)
+            {
+                if ((size_t) n < size) {
+                    if (!rev->pending_eof) {
+                        rev->ready = 0;
+                    }
+
+                    rev->available = 0;
+                }
+
+                return n;
+            }
+
+#endif
+
+            if ((size_t) 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,
+                           "recv() not ready");
+            n = NGX_AGAIN;
+
+        } else {
+            n = ngx_connection_error(c, err, "recv() failed");
+            break;
+        }
+
+    } while (err == NGX_EINTR);
+
+    rev->ready = 0;
+
+    if (n == NGX_ERROR) {
+        rev->error = 1;
+    }
+
+    return n;
+}