freebsd code path optimisation attempt

from regular file to socket cases.

Author: devnexen

configure.ac

@@ -1687,6 +1687,7 @@ PHP_ADD_SOURCES_X([main],
 PHP_ADD_SOURCES([main/io], m4_normalize([
     php_io.c
     php_io_copy_linux.c
+    php_io_copy_freebsd.c
   ]),
   [-DZEND_ENABLE_STATIC_TSRMLS_CACHE=1])
 

main/io/php_io_copy_freebsd.c

@@ -0,0 +1,58 @@
+#ifdef __FreeBSD__
+   
+   #include "php_io_internal.h"
+   #include <sys/types.h>
+   #include <sys/socket.h>
+   #include <sys/uio.h>
+   #include <unistd.h>
+   #include <errno.h>
+   
+   static ssize_t php_io_freebsd_sendfile(int src_fd, int dest_fd, size_t maxlen)
+   {
+       off_t total_sent = 0;
+       size_t remaining = (maxlen == PHP_IO_COPY_ALL) ? 0 : maxlen;
+   
+       while (maxlen == PHP_IO_COPY_ALL || remaining > 0) {
+           off_t sent_in_this_call = 0;
+           int result = sendfile(src_fd, dest_fd, total_sent, remaining, NULL, &sent_in_this_call, 0);
+   
+           if (sent_in_this_call > 0) {
+               total_sent += sent_in_this_call;
+               if (maxlen != PHP_IO_COPY_ALL) {
+                   remaining -= (size_t)sent_in_this_call;
+               }
+           }
+   
+           if (result == 0) {
+               if (sent_in_this_call == 0 || remaining == 0) {
+                   break;
+               }
+           } else {
+               if (errno == EAGAIN || errno == EINTR) {
+                   if (sent_in_this_call > 0) {
+			   continue;
+		   }
+                   break;
+               }
+               if (total_sent == 0) {
+                   return php_io_generic_copy_fallback(src_fd, dest_fd, maxlen);
+               }
+               break;
+           }
+       }
+   
+       return (total_sent > 0) ? (ssize_t)total_sent : -1;
+   }
+   
+   ssize_t php_io_freebsd_copy(php_io_fd *src, php_io_fd *dest, size_t maxlen)
+   {
+       /* unlike linux, sendfile on freebsd works only under those conditions */
+       if (src->fd_type == PHP_IO_FD_FILE && dest->fd_type == PHP_IO_FD_SOCKET) {
+           return php_io_freebsd_sendfile(src->fd, dest->fd, maxlen);
+       }
+   
+       return php_io_generic_copy_fallback(src->fd, dest->fd, maxlen);
+   }
+   
+   #endif
+

main/io/php_io_freebsd.h

@@ -0,0 +1,25 @@
+/*
+   +----------------------------------------------------------------------+
+   | Copyright (c) The PHP Group                                          |
+   +----------------------------------------------------------------------+
+   | This source file is subject to version 3.01 of the PHP license,      |
+   | that is bundled with this package in the file LICENSE, and is        |
+   | available through the world-wide-web at the following url:           |
+   | https://www.php.net/license/3_01.txt                                 |
+   | If you did not receive a copy of the PHP license and are unable to   |
+   | obtain it through the world-wide-web, please send a note to          |
+   | license@php.net so we can mail you a copy immediately.               |
+   +----------------------------------------------------------------------+
+   | Authors: Jakub Zelenka <bukka@php.net>                               |
+   +----------------------------------------------------------------------+
+ */
+
+  #ifndef PHP_IO_FREEBSD_H
+  #define PHP_IO_FREEBSD_H
+
+  #define PHP_IO_PLATFORM_COPY php_io_freebsd_copy
+  #define PHP_IO_PLATFORM_NAME "freebsd"
+
+  ssize_t php_io_freebsd_copy(php_io_fd *src, php_io_fd *dest, size_t maxlen);
+
+  #endif /* PHP_IO_FREEBSD_H */

main/io/php_io_internal.h

@@ -26,6 +26,8 @@ ssize_t php_io_generic_copy_fallback(int src_fd, int dest_fd, size_t maxlen);
 #include "php_io_linux.h"
 #elif defined(PHP_WIN32)
 #include "php_io_windows.h"
+#elif defined(__FreeBSD__)
+#include "php_io_freebsd.h"
 #else
 #include "php_io_generic.h"
 #endif