New module 'socketlib'.

* modules/socketlib: New file.
* m4/socketlib.m4: New file, extracted from m4/sockets.m4.
* m4/sockets.m4 (gl_SOCKETS): Require gl_SOCKETLIB.
* modules/sockets (Depends-on): Add socketlib.
Suggested by Sam Steingold <sds@gnu.org>.

5 files changed, 121 insertions, 75 deletions

diff --git a/ChangeLog b/ChangeLog
index 2d03ea739f..f0316e6953 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2010-09-01  Bruno Haible  <bruno@clisp.org>
+
+	New module 'socketlib'.
+	* modules/socketlib: New file.
+	* m4/socketlib.m4: New file, extracted from m4/sockets.m4.
+	* m4/sockets.m4 (gl_SOCKETS): Require gl_SOCKETLIB.
+	* modules/sockets (Depends-on): Add socketlib.
+	Suggested by Sam Steingold <sds@gnu.org>.
+
 2010-09-01  Paul Eggert  <eggert@cs.ucla.edu>
 
 	fcntl-h, etc.: prefer O_SEARCH to O_RDONLY when applicable
diff --git a/m4/socketlib.m4 b/m4/socketlib.m4
new file mode 100644
index 0000000000..7bf02b5aee
--- /dev/null
+++ b/m4/socketlib.m4
@@ -0,0 +1,86 @@
+# socketlib.m4 serial 1
+dnl Copyright (C) 2008-2010 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl gl_SOCKETLIB
+dnl Determines the library to use for socket functions.
+dnl Sets and AC_SUBSTs LIBSOCKET.
+
+AC_DEFUN([gl_SOCKETLIB],
+[
+  gl_PREREQ_SYS_H_WINSOCK2 dnl for HAVE_WINSOCK2_H
+  LIBSOCKET=
+  if test $HAVE_WINSOCK2_H = 1; then
+    dnl Native Windows API (not Cygwin).
+    AC_CACHE_CHECK([if we need to call WSAStartup in winsock2.h and -lws2_32],
+                   [gl_cv_func_wsastartup], [
+      gl_save_LIBS="$LIBS"
+      LIBS="$LIBS -lws2_32"
+      AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+#ifdef HAVE_WINSOCK2_H
+# include <winsock2.h>
+#endif]], [[
+          WORD wVersionRequested = MAKEWORD(1, 1);
+          WSADATA wsaData;
+          int err = WSAStartup(wVersionRequested, &wsaData);
+          WSACleanup ();]])],
+        gl_cv_func_wsastartup=yes, gl_cv_func_wsastartup=no)
+      LIBS="$gl_save_LIBS"
+    ])
+    if test "$gl_cv_func_wsastartup" = "yes"; then
+      AC_DEFINE([WINDOWS_SOCKETS], [1], [Define if WSAStartup is needed.])
+      LIBSOCKET='-lws2_32'
+    fi
+  else
+    dnl Unix API.
+    dnl Solaris has most socket functions in libsocket.
+    dnl Haiku has most socket functions in libnetwork.
+    dnl BeOS has most socket functions in libnet.
+    AC_CACHE_CHECK([for library containing setsockopt], [gl_cv_lib_socket], [
+      gl_cv_lib_socket=
+      AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
+#ifdef __cplusplus
+"C"
+#endif
+char setsockopt();]], [[setsockopt();]])],
+        [],
+        [gl_save_LIBS="$LIBS"
+         LIBS="$gl_save_LIBS -lsocket"
+         AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
+#ifdef __cplusplus
+"C"
+#endif
+char setsockopt();]], [[setsockopt();]])],
+           [gl_cv_lib_socket="-lsocket"])
+         if test -z "$gl_cv_lib_socket"; then
+           LIBS="$gl_save_LIBS -lnetwork"
+           AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
+#ifdef __cplusplus
+"C"
+#endif
+char setsockopt();]], [[setsockopt();]])],
+             [gl_cv_lib_socket="-lnetwork"])
+           if test -z "$gl_cv_lib_socket"; then
+             LIBS="$gl_save_LIBS -lnet"
+             AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
+#ifdef __cplusplus
+"C"
+#endif
+char setsockopt();]], [[setsockopt();]])],
+               [gl_cv_lib_socket="-lnet"])
+           fi
+         fi
+         LIBS="$gl_save_LIBS"
+        ])
+      if test -z "$gl_cv_lib_socket"; then
+        gl_cv_lib_socket="none needed"
+      fi
+    ])
+    if test "$gl_cv_lib_socket" != "none needed"; then
+      LIBSOCKET="$gl_cv_lib_socket"
+    fi
+  fi
+  AC_SUBST([LIBSOCKET])
+])
diff --git a/m4/sockets.m4 b/m4/sockets.m4
index aefb936079..ba9a563d8e 100644
--- a/m4/sockets.m4
+++ b/m4/sockets.m4
@@ -1,4 +1,4 @@
-# sockets.m4 serial 6
+# sockets.m4 serial 7
 dnl Copyright (C) 2008, 2009, 2010 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -7,80 +7,7 @@ dnl with or without modifications, as long as this notice is preserved.
 AC_DEFUN([gl_SOCKETS],
 [
   AC_REQUIRE([AC_C_INLINE])
-
-  gl_PREREQ_SYS_H_WINSOCK2 dnl for HAVE_WINSOCK2_H
-  LIBSOCKET=
-  if test $HAVE_WINSOCK2_H = 1; then
-    dnl Native Windows API (not Cygwin).
-    AC_CACHE_CHECK([if we need to call WSAStartup in winsock2.h and -lws2_32],
-                   [gl_cv_func_wsastartup], [
-      gl_save_LIBS="$LIBS"
-      LIBS="$LIBS -lws2_32"
-      AC_LINK_IFELSE([AC_LANG_PROGRAM([[
-#ifdef HAVE_WINSOCK2_H
-# include <winsock2.h>
-#endif]], [[
-          WORD wVersionRequested = MAKEWORD(1, 1);
-          WSADATA wsaData;
-          int err = WSAStartup(wVersionRequested, &wsaData);
-          WSACleanup ();]])],
-        gl_cv_func_wsastartup=yes, gl_cv_func_wsastartup=no)
-      LIBS="$gl_save_LIBS"
-    ])
-    if test "$gl_cv_func_wsastartup" = "yes"; then
-      AC_DEFINE([WINDOWS_SOCKETS], [1], [Define if WSAStartup is needed.])
-      LIBSOCKET='-lws2_32'
-    fi
-  else
-    dnl Unix API.
-    dnl Solaris has most socket functions in libsocket.
-    dnl Haiku has most socket functions in libnetwork.
-    dnl BeOS has most socket functions in libnet.
-    AC_CACHE_CHECK([for library containing setsockopt], [gl_cv_lib_socket], [
-      gl_cv_lib_socket=
-      AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
-#ifdef __cplusplus
-"C"
-#endif
-char setsockopt();]], [[setsockopt();]])],
-        [],
-        [gl_save_LIBS="$LIBS"
-         LIBS="$gl_save_LIBS -lsocket"
-         AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
-#ifdef __cplusplus
-"C"
-#endif
-char setsockopt();]], [[setsockopt();]])],
-           [gl_cv_lib_socket="-lsocket"])
-         if test -z "$gl_cv_lib_socket"; then
-           LIBS="$gl_save_LIBS -lnetwork"
-           AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
-#ifdef __cplusplus
-"C"
-#endif
-char setsockopt();]], [[setsockopt();]])],
-             [gl_cv_lib_socket="-lnetwork"])
-           if test -z "$gl_cv_lib_socket"; then
-             LIBS="$gl_save_LIBS -lnet"
-             AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern
-#ifdef __cplusplus
-"C"
-#endif
-char setsockopt();]], [[setsockopt();]])],
-               [gl_cv_lib_socket="-lnet"])
-           fi
-         fi
-         LIBS="$gl_save_LIBS"
-        ])
-      if test -z "$gl_cv_lib_socket"; then
-        gl_cv_lib_socket="none needed"
-      fi
-    ])
-    if test "$gl_cv_lib_socket" != "none needed"; then
-      LIBSOCKET="$gl_cv_lib_socket"
-    fi
-  fi
-  AC_SUBST([LIBSOCKET])
+  AC_REQUIRE([gl_SOCKETLIB])
   gl_PREREQ_SOCKETS
 ])
 
diff --git a/modules/socketlib b/modules/socketlib
new file mode 100644
index 0000000000..d4c95db50b
--- /dev/null
+++ b/modules/socketlib
@@ -0,0 +1,23 @@
+Description:
+Access to socket primitives.
+
+Files:
+m4/socketlib.m4
+
+Depends-on:
+
+configure.ac:
+gl_SOCKETLIB
+
+Makefile.am:
+
+Include:
+
+Link:
+$(LIBSOCKET)
+
+License:
+LGPLv2+
+
+Maintainer:
+Simon Josefsson
diff --git a/modules/sockets b/modules/sockets
index 9e03ac6813..b79a02fb7c 100644
--- a/modules/sockets
+++ b/modules/sockets
@@ -8,6 +8,7 @@ lib/w32sock.h
 m4/sockets.m4
 
 Depends-on:
+socketlib
 sys_socket
 close-hook