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53 lines
2.0 KiB
Plaintext
53 lines
2.0 KiB
Plaintext
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# socklen.m4 serial 4
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dnl Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Albert Chin, Windows fixes from Simon Josefsson.
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dnl Check for socklen_t: historically on BSD it is an int, and in
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dnl POSIX 1g it is a type of its own, but some platforms use different
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dnl types for the argument to getsockopt, getpeername, etc. So we
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dnl have to test to find something that will work.
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dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find
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dnl it there first. That file is included by gnulib's socket_.h, which
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dnl all users of this module should include. Cygwin must not include
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dnl ws2tcpip.h.
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AC_DEFUN([gl_TYPE_SOCKLEN_T],
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[AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl
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AC_CHECK_TYPE([socklen_t], ,
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[AC_MSG_CHECKING([for socklen_t equivalent])
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AC_CACHE_VAL([gl_cv_gl_cv_socklen_t_equiv],
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[# Systems have either "struct sockaddr *" or
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# "void *" as the second argument to getpeername
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gl_cv_socklen_t_equiv=
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for arg2 in "struct sockaddr" void; do
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for t in int size_t "unsigned int" "long int" "unsigned long int"; do
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AC_TRY_COMPILE(
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[#include <sys/types.h>
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#include <sys/socket.h>
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int getpeername (int, $arg2 *, $t *);],
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[$t len;
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getpeername (0, 0, &len);],
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[gl_cv_socklen_t_equiv="$t"])
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test "$gl_cv_socklen_t_equiv" != "" && break
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done
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test "$gl_cv_socklen_t_equiv" != "" && break
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done
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])
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if test "$gl_cv_socklen_t_equiv" = ""; then
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AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
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fi
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AC_MSG_RESULT([$gl_cv_socklen_t_equiv])
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AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv],
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[type to use in place of socklen_t if not defined])],
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[#include <sys/types.h>
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#if HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#elif HAVE_WS2TCPIP_H
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# include <ws2tcpip.h>
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#endif])])
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