Use the new library CURLOPT_TCP_KEEPALIVE rather than disabling this via
the sockopt callback. If --keepalive-time is used, apply the value to
CURLOPT_TCP_KEEPIDLE and CURLOPT_TCP_KEEPINTVL.

---
The matching changes for the front end to use the new options from the previous
patch.
 docs/curl.1        |    3 +-
 src/Makefile.inc   |    2 -
 src/tool_cb_skt.c  |   97 ----------------------------------------------------
 src/tool_cb_skt.h  |   35 -------------------
 src/tool_operate.c |   12 ++++--
 5 files changed, 10 insertions(+), 139 deletions(-)
 delete mode 100644 src/tool_cb_skt.c
 delete mode 100644 src/tool_cb_skt.h
diff --git a/docs/curl.1 b/docs/curl.1
index e92cf51..5bc8f0d 100644
--- a/docs/curl.1
+++ b/docs/curl.1
@@ -711,7 +711,8 @@ currently effective on operating systems offering the TCP_KEEPIDLE and
 TCP_KEEPINTVL socket options (meaning Linux, recent AIX, HP-UX and more). This
 option has no effect if \fI--no-keepalive\fP is used. (Added in 7.18.0)
 
-If this option is used multiple times, the last occurrence sets the amount.
+If this option is used multiple times, the last occurrence sets the amount. If
+unspecified, the option defaults to 60 seconds.
 .IP "--key <key>"
 (SSL/SSH) Private key file name. Allows you to provide your private key in this
 separate file.
diff --git a/src/Makefile.inc b/src/Makefile.inc
index 1660bc4..a43ac51 100644
--- a/src/Makefile.inc
+++ b/src/Makefile.inc
@@ -22,7 +22,6 @@ CURL_CFILES = hugehelp.c \
 	tool_cb_prg.c \
 	tool_cb_rea.c \
 	tool_cb_see.c \
-	tool_cb_skt.c \
 	tool_cb_wrt.c \
 	tool_cfgable.c \
 	tool_convert.c \
@@ -62,7 +61,6 @@ CURL_HFILES = hugehelp.h setup.h config-win32.h config-mac.h \
 	tool_cb_prg.h \
 	tool_cb_rea.h \
 	tool_cb_see.h \
-	tool_cb_skt.h \
 	tool_cb_wrt.h \
 	tool_cfgable.h \
 	tool_convert.h \
diff --git a/src/tool_cb_skt.c b/src/tool_cb_skt.c
deleted file mode 100644
index 156c110..0000000
--- a/src/tool_cb_skt.c
+++ /dev/null
@@ -1,97 +0,0 @@
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel_at_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 http://curl.haxx.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.
- *
- ***************************************************************************/
-#include "setup.h"
-
-#include <curl/curl.h>
-
-#ifdef HAVE_SYS_SOCKET_H
-#  include <sys/socket.h>
-#endif
-
-#define ENABLE_CURLX_PRINTF
-/* use our own printf() functions */
-#include "curlx.h"
-
-#include "tool_cfgable.h"
-#include "tool_msgs.h"
-#include "tool_cb_skt.h"
-
-#include "memdebug.h" /* keep this as LAST include */
-
-/*
-** callback for CURLOPT_SOCKOPTFUNCTION
-*/
-
-int tool_sockopt_cb(void *userdata, curl_socket_t curlfd, curlsocktype purpose)
-{
-  struct Configurable *config = userdata;
-
-  int onoff = 1; /* this callback is only used if we ask for keepalives on the
-                    connection */
-
-#if defined(TCP_KEEPIDLE) || defined(TCP_KEEPINTVL)
-  int keepidle = (int)config->alivetime;
-#endif
-
-  switch(purpose) {
-  case CURLSOCKTYPE_IPCXN:
-    if(setsockopt(curlfd, SOL_SOCKET, SO_KEEPALIVE, (void *)&onoff,
-                  sizeof(onoff)) < 0) {
-      /* don't abort operation, just issue a warning */
-      SET_SOCKERRNO(0);
-      warnf(config, "Could not set SO_KEEPALIVE!\n");
-      return 0;
-    }
-    else {
-      if(config->alivetime) {
-#ifdef TCP_KEEPIDLE
-        if(setsockopt(curlfd, IPPROTO_TCP, TCP_KEEPIDLE, (void *)&keepidle,
-                      sizeof(keepidle)) < 0) {
-          /* don't abort operation, just issue a warning */
-          SET_SOCKERRNO(0);
-          warnf(config, "Could not set TCP_KEEPIDLE!\n");
-          return 0;
-        }
-#endif
-#ifdef TCP_KEEPINTVL
-        if(setsockopt(curlfd, IPPROTO_TCP, TCP_KEEPINTVL, (void *)&keepidle,
-                      sizeof(keepidle)) < 0) {
-          /* don't abort operation, just issue a warning */
-          SET_SOCKERRNO(0);
-          warnf(config, "Could not set TCP_KEEPINTVL!\n");
-          return 0;
-        }
-#endif
-#if !defined(TCP_KEEPIDLE) || !defined(TCP_KEEPINTVL)
-        warnf(config, "Keep-alive functionality somewhat crippled due to "
-              "missing support in your operating system!\n");
-#endif
-      }
-    }
-    break;
-  default:
-    break;
-  }
-
-  return 0;
-}
-
diff --git a/src/tool_cb_skt.h b/src/tool_cb_skt.h
deleted file mode 100644
index 11bd0c4..0000000
--- a/src/tool_cb_skt.h
+++ /dev/null
@@ -1,35 +0,0 @@
-#ifndef HEADER_CURL_TOOL_CB_SKT_H
-#define HEADER_CURL_TOOL_CB_SKT_H
-/***************************************************************************
- *                                  _   _ ____  _
- *  Project                     ___| | | |  _ \| |
- *                             / __| | | | |_) | |
- *                            | (__| |_| |  _ <| |___
- *                             \___|\___/|_| \_\_____|
- *
- * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel_at_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 http://curl.haxx.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.
- *
- ***************************************************************************/
-#include "setup.h"
-
-/*
-** callback for CURLOPT_SOCKOPTFUNCTION
-*/
-
-int tool_sockopt_cb(void *userdata,
-                    curl_socket_t curlfd,
-                    curlsocktype purpose);
-
-#endif /* HEADER_CURL_TOOL_CB_SKT_H */
-
diff --git a/src/tool_operate.c b/src/tool_operate.c
index a6f6f0b..e093560 100644
--- a/src/tool_operate.c
+++ b/src/tool_operate.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel_at_haxx.se>, et al.
+ * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel_at_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
@@ -54,7 +54,6 @@
 #include "tool_cb_prg.h"
 #include "tool_cb_rea.h"
 #include "tool_cb_see.h"
-#include "tool_cb_skt.h"
 #include "tool_cb_wrt.h"
 #include "tool_dirhie.h"
 #include "tool_doswin.h"
@@ -1147,8 +1146,13 @@ int operate(struct Configurable *config, int argc, argv_item_t argv[])
 
         /* curl 7.17.1 */
         if(!config->nokeepalive) {
-          my_setopt(curl, CURLOPT_SOCKOPTFUNCTION, tool_sockopt_cb);
-          my_setopt(curl, CURLOPT_SOCKOPTDATA, config);
+          my_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);
+          if(config->alivetime != 0) {
+            my_setopt(curl, CURLOPT_TCP_KEEPIDLE, config->alivetime);
+            my_setopt(curl, CURLOPT_TCP_KEEPINTVL, config->alivetime);
+          }
+        } else {
+          my_setopt(curl, CURLOPT_TCP_KEEPALIVE, 0L);
         }
 
         /* curl 7.20.0 */
-- 
1.7.8.4
-------------------------------------------------------------------
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