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78 lines
3.2 KiB
Plaintext
78 lines
3.2 KiB
Plaintext
# socklen.m4 serial 10
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dnl Copyright (C) 2005-2007, 2009-2017 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.:
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dnl HP-UX 10.20, IRIX 6.5, OSF/1 4.0, Interix 3.5, BeOS.
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dnl So we have to test to find something that will work.
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AC_DEFUN([gl_TYPE_SOCKLEN_T],
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[AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])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_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_COMPILE_IFELSE([AC_LANG_PROGRAM(
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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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[gl_SOCKET_HEADERS])])
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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 too. But on Cygwin, wc2tcpip.h must not be included. Users
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dnl of this module should use the same include pattern as gl_SOCKET_HEADERS.
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dnl When you change this macro, keep also in sync:
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dnl - gl_CHECK_SOCKET_HEADERS,
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dnl - the Include section of modules/socklen.
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AC_DEFUN([gl_SOCKET_HEADERS],
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[
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/* <sys/types.h> is not needed according to POSIX, but the
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<sys/socket.h> in i386-unknown-freebsd4.10 and
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powerpc-apple-darwin5.5 required it. */
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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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])
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dnl Tests for the existence of the header for socket facilities.
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dnl Defines the C macros HAVE_SYS_SOCKET_H, HAVE_WS2TCPIP_H.
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dnl This macro must match gl_SOCKET_HEADERS.
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AC_DEFUN([gl_CHECK_SOCKET_HEADERS],
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[AC_CHECK_HEADERS_ONCE([sys/socket.h])
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if test $ac_cv_header_sys_socket_h = no; then
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dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
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dnl the check for those headers unconditional; yet cygwin reports
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dnl that the headers are present but cannot be compiled (since on
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dnl cygwin, all socket information should come from sys/socket.h).
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AC_CHECK_HEADERS([ws2tcpip.h])
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fi
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])
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