1# socketlib.m4 serial 2 2dnl Copyright (C) 2008-2020 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 $HAVE_WINSOCK2_H = 1; then 16 dnl Native Windows API (not Cygwin). 17 AC_CACHE_CHECK([if we need to call WSAStartup in winsock2.h and -lws2_32], 18 [gl_cv_func_wsastartup], [ 19 gl_save_LIBS="$LIBS" 20 LIBS="$LIBS -lws2_32" 21 AC_LINK_IFELSE([AC_LANG_PROGRAM([[ 22#ifdef HAVE_WINSOCK2_H 23# include <winsock2.h> 24#endif]], [[ 25 WORD wVersionRequested = MAKEWORD(1, 1); 26 WSADATA wsaData; 27 int err = WSAStartup(wVersionRequested, &wsaData); 28 WSACleanup ();]])], 29 gl_cv_func_wsastartup=yes, gl_cv_func_wsastartup=no) 30 LIBS="$gl_save_LIBS" 31 ]) 32 if test "$gl_cv_func_wsastartup" = "yes"; then 33 AC_DEFINE([WINDOWS_SOCKETS], [1], [Define if WSAStartup is needed.]) 34 LIBSOCKET='-lws2_32' 35 fi 36 else 37 dnl Unix API. 38 dnl Solaris has most socket functions in libsocket. 39 dnl Haiku has most socket functions in libnetwork. 40 dnl BeOS has most socket functions in libnet. 41 dnl On HP-UX, do NOT link with libxnet, because in 64-bit mode this would 42 dnl break code (e.g. in libraries) that invokes accept(), getpeername(), 43 dnl getsockname(), getsockopt(), or recvfrom() with a 32-bit addrlen. See 44 dnl "man xopen_networking" for details. 45 AC_CACHE_CHECK([for library containing setsockopt], [gl_cv_lib_socket], [ 46 gl_cv_lib_socket= 47 AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern 48#ifdef __cplusplus 49"C" 50#endif 51char setsockopt();]], [[setsockopt();]])], 52 [], 53 [gl_save_LIBS="$LIBS" 54 LIBS="$gl_save_LIBS -lsocket" 55 AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern 56#ifdef __cplusplus 57"C" 58#endif 59char setsockopt();]], [[setsockopt();]])], 60 [gl_cv_lib_socket="-lsocket"]) 61 if test -z "$gl_cv_lib_socket"; then 62 LIBS="$gl_save_LIBS -lnetwork" 63 AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern 64#ifdef __cplusplus 65"C" 66#endif 67char setsockopt();]], [[setsockopt();]])], 68 [gl_cv_lib_socket="-lnetwork"]) 69 if test -z "$gl_cv_lib_socket"; then 70 LIBS="$gl_save_LIBS -lnet" 71 AC_LINK_IFELSE([AC_LANG_PROGRAM([[extern 72#ifdef __cplusplus 73"C" 74#endif 75char setsockopt();]], [[setsockopt();]])], 76 [gl_cv_lib_socket="-lnet"]) 77 fi 78 fi 79 LIBS="$gl_save_LIBS" 80 ]) 81 if test -z "$gl_cv_lib_socket"; then 82 gl_cv_lib_socket="none needed" 83 fi 84 ]) 85 if test "$gl_cv_lib_socket" != "none needed"; then 86 LIBSOCKET="$gl_cv_lib_socket" 87 fi 88 fi 89 AC_SUBST([LIBSOCKET]) 90]) 91