1# socketlib.m4 serial 3 2dnl Copyright (C) 2008-2022 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7dnl gl_SOCKETLIB 8dnl Determines the library to use for socket functions. 9dnl Sets and AC_SUBSTs LIBSOCKET. 10 11AC_DEFUN([gl_SOCKETLIB], 12[ 13 gl_PREREQ_SYS_H_WINSOCK2 dnl for HAVE_WINSOCK2_H 14 LIBSOCKET= 15 if test $HAVE_WINSOCK2_H = 1; then 16 dnl Native Windows API (not Cygwin). 17 dnl If the function WSAStartup exists (declared in <winsock2.h> and 18 dnl defined through -lws2_32), we need to call it. 19 AC_CACHE_CHECK([for WSAStartup], 20 [gl_cv_func_wsastartup], [ 21 gl_save_LIBS="$LIBS" 22 LIBS="$LIBS -lws2_32" 23 AC_LINK_IFELSE( 24 [AC_LANG_PROGRAM([[ 25#ifdef HAVE_WINSOCK2_H 26# include <winsock2.h> 27#endif]], [[ 28 WORD wVersionRequested = MAKEWORD(1, 1); 29 WSADATA wsaData; 30 int err = WSAStartup(wVersionRequested, &wsaData); 31 WSACleanup (); 32 ]]) 33 ], 34 [gl_cv_func_wsastartup=yes], 35 [gl_cv_func_wsastartup=no]) 36 LIBS="$gl_save_LIBS" 37 ]) 38 if test "$gl_cv_func_wsastartup" = "yes"; then 39 AC_DEFINE([WINDOWS_SOCKETS], [1], [Define if WSAStartup is needed.]) 40 LIBSOCKET='-lws2_32' 41 fi 42 else 43 dnl Unix API. 44 dnl Solaris has most socket functions in libsocket. 45 dnl Haiku has most socket functions in libnetwork. 46 dnl BeOS has most socket functions in libnet. 47 dnl On HP-UX, do NOT link with libxnet, because in 64-bit mode this would 48 dnl break code (e.g. in libraries) that invokes accept(), getpeername(), 49 dnl getsockname(), getsockopt(), or recvfrom() with a 32-bit addrlen. See 50 dnl "man xopen_networking" for details. 51 AC_CACHE_CHECK([for library containing setsockopt], [gl_cv_lib_socket], [ 52 gl_cv_lib_socket= 53 AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern 54#ifdef __cplusplus 55"C" 56#endif 57char setsockopt();]], [[setsockopt();]])], 58 [], 59 [gl_save_LIBS="$LIBS" 60 LIBS="$gl_save_LIBS -lsocket" 61 AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern 62#ifdef __cplusplus 63"C" 64#endif 65char setsockopt();]], [[setsockopt();]])], 66 [gl_cv_lib_socket="-lsocket"]) 67 if test -z "$gl_cv_lib_socket"; then 68 LIBS="$gl_save_LIBS -lnetwork" 69 AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern 70#ifdef __cplusplus 71"C" 72#endif 73char setsockopt();]], [[setsockopt();]])], 74 [gl_cv_lib_socket="-lnetwork"]) 75 if test -z "$gl_cv_lib_socket"; then 76 LIBS="$gl_save_LIBS -lnet" 77 AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern 78#ifdef __cplusplus 79"C" 80#endif 81char setsockopt();]], [[setsockopt();]])], 82 [gl_cv_lib_socket="-lnet"]) 83 fi 84 fi 85 LIBS="$gl_save_LIBS" 86 ]) 87 if test -z "$gl_cv_lib_socket"; then 88 gl_cv_lib_socket="none needed" 89 fi 90 ]) 91 if test "$gl_cv_lib_socket" != "none needed"; then 92 LIBSOCKET="$gl_cv_lib_socket" 93 fi 94 fi 95 AC_SUBST([LIBSOCKET]) 96]) 97