Initial version.

src/nxt_sendbuf.h

@@ -0,0 +1,108 @@
+
+/*
+ * Copyright (C) Igor Sysoev
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef _NXT_SENDBUF_H_INCLUDED_
+#define _NXT_SENDBUF_H_INCLUDED_
+
+
+/*
+ * The sendbuf interface is intended to send a buffer chain to a connection.
+ * It uses sendfile interface if available.  Otherwise it can send only
+ * memory buffers, so file buffers must be read in memory in advance.
+ *
+ * The sendbuf interface sets c->socket.write_ready to appropriate state
+ * and returns:
+ *
+ *   N > 0      if sendbuf sent N bytes.
+ *
+ *   0          if sendbuf was interrupted (EINTR and so on),
+ *              or sendbuf sent previously buffered data,
+ *              or single sync buffer has been encountered.
+ *              In all these cases sendbuf is ready to continue
+ *              operation, unless c->socket.write_ready is cleared.
+ *
+ *   NXT_AGAIN  if sendbuf did not send any bytes.
+ *
+ *   NXT_ERROR  if there was erorr.
+ *
+ * The sendbuf limit is size_t type since size_t is large enough and many
+ * sendfile implementations do not support anyway sending more than size_t
+ * at once.  The limit support is located at the sendbuf level otherwise
+ * an additional limited chain must be created on each sendbuf call.
+ */
+
+
+typedef struct {
+    nxt_buf_t    *buf;
+    nxt_iobuf_t  *iobuf;
+
+    uint32_t     nmax;
+    uint8_t      sync;   /* 1 bit */
+    uint8_t      last;   /* 1 bit */
+
+    size_t       size;
+    size_t       limit;
+} nxt_sendbuf_coalesce_t;
+
+
+#if (NXT_HAVE_LINUX_SENDFILE)
+#define NXT_HAVE_SENDFILE  1
+ssize_t nxt_linux_event_conn_io_sendfile(nxt_event_conn_t *c, nxt_buf_t *b,
+    size_t limit);
+#endif
+
+#if (NXT_HAVE_FREEBSD_SENDFILE)
+#define NXT_HAVE_SENDFILE  1
+ssize_t nxt_freebsd_event_conn_io_sendfile(nxt_event_conn_t *c, nxt_buf_t *b,
+    size_t limit);
+#endif
+
+#if (NXT_HAVE_SOLARIS_SENDFILEV)
+#define NXT_HAVE_SENDFILE  1
+ssize_t nxt_solaris_event_conn_io_sendfilev(nxt_event_conn_t *c, nxt_buf_t *b,
+    size_t limit);
+#endif
+
+#if (NXT_HAVE_MACOSX_SENDFILE)
+#define NXT_HAVE_SENDFILE  1
+ssize_t nxt_macosx_event_conn_io_sendfile(nxt_event_conn_t *c, nxt_buf_t *b,
+    size_t limit);
+#endif
+
+#if (NXT_HAVE_AIX_SEND_FILE)
+#define NXT_HAVE_SENDFILE  1
+ssize_t nxt_aix_event_conn_io_send_file(nxt_event_conn_t *c, nxt_buf_t *b,
+    size_t limit);
+#endif
+
+#if (NXT_HAVE_HPUX_SENDFILE)
+#define NXT_HAVE_SENDFILE  1
+ssize_t nxt_hpux_event_conn_io_sendfile(nxt_event_conn_t *c, nxt_buf_t *b,
+    size_t limit);
+#endif
+
+ssize_t nxt_event_conn_io_sendbuf(nxt_event_conn_t *c, nxt_buf_t *b,
+    size_t limit);
+
+
+nxt_uint_t nxt_sendbuf_mem_coalesce(nxt_sendbuf_coalesce_t *sb);
+size_t nxt_sendbuf_file_coalesce(nxt_sendbuf_coalesce_t *sb);
+
+/*
+ * Auxiliary nxt_sendbuf_copy_coalesce() interface copies small memory
+ * buffers into internal buffer before output.  It is intended for
+ * SSL/TLS libraries which lack vector I/O interface yet add noticeable
+ * overhead to each SSL/TLS record.
+ */
+ssize_t nxt_sendbuf_copy_coalesce(nxt_event_conn_t *c, nxt_buf_mem_t *bm,
+    nxt_buf_t *b, size_t limit);
+
+nxt_buf_t *nxt_sendbuf_update(nxt_buf_t *b, size_t sent);
+nxt_buf_t *nxt_sendbuf_completion(nxt_thread_t *thr, nxt_work_queue_t *wq,
+    nxt_buf_t *b, size_t sent);
+
+
+#endif /* _NXT_SENDBUF_H_INCLUDED_ */