1 files changed, 93 insertions, 0 deletions
diff --git a/libs/libcurl/src/curlx/nonblock.c b/libs/libcurl/src/curlx/nonblock.c
new file mode 100644
index 0000000000..4f8153f140
--- /dev/null
+++ b/libs/libcurl/src/curlx/nonblock.c
@@ -0,0 +1,93 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+
+#include "../curl_setup.h"
+
+#ifdef HAVE_SYS_IOCTL_H
+#include <sys/ioctl.h>
+#endif
+#ifdef HAVE_FCNTL_H
+#include <fcntl.h>
+#endif
+
+#ifdef __VMS
+#include <in.h>
+#include <inet.h>
+#endif
+
+#include "nonblock.h"
+
+/*
+ * curlx_nonblock() set the given socket to either blocking or non-blocking
+ * mode based on the 'nonblock' boolean argument. This function is highly
+ * portable.
+ */
+int curlx_nonblock(curl_socket_t sockfd,    /* operate on this */
+                   int nonblock   /* TRUE or FALSE */)
+{
+#if defined(HAVE_FCNTL_O_NONBLOCK)
+  /* most recent Unix versions */
+  int flags;
+  flags = sfcntl(sockfd, F_GETFL, 0);
+  if(flags < 0)
+    return -1;
+  /* Check if the current file status flags have already satisfied
+   * the request, if so, it is no need to call fcntl() to replicate it.
+   */
+  if(!!(flags & O_NONBLOCK) == !!nonblock)
+    return 0;
+  if(nonblock)
+    flags |= O_NONBLOCK;
+  else
+    flags &= ~O_NONBLOCK;
+  return sfcntl(sockfd, F_SETFL, flags);
+
+#elif defined(HAVE_IOCTLSOCKET_CAMEL_FIONBIO)
+
+  /* Amiga */
+  long flags = nonblock ? 1L : 0L;
+  return IoctlSocket(sockfd, FIONBIO, (char *)&flags);
+
+#elif defined(HAVE_IOCTL_FIONBIO)
+
+  /* older Unix versions */
+  int flags = nonblock ? 1 : 0;
+  return ioctl(sockfd, FIONBIO, &flags);
+
+#elif defined(HAVE_IOCTLSOCKET_FIONBIO)
+
+  /* Windows */
+  unsigned long flags = nonblock ? 1UL : 0UL;
+  return ioctlsocket(sockfd, (long)FIONBIO, &flags);
+
+#elif defined(HAVE_SETSOCKOPT_SO_NONBLOCK)
+
+  /* Orbis OS */
+  long b = nonblock ? 1L : 0L;
+  return setsockopt(sockfd, SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b));
+
+#else
+#  error "no non-blocking method was found/used/set"
+#endif
+}