| 1 | # socklen.m4 serial 11
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| 2 | dnl Copyright (C) 2005-2007, 2009-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl From Albert Chin, Windows fixes from Simon Josefsson.
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| 8 |
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| 9 | dnl Check for socklen_t: historically on BSD it is an int, and in
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| 10 | dnl POSIX 1g it is a type of its own, but some platforms use different
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| 11 | dnl types for the argument to getsockopt, getpeername, etc.:
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| 12 | dnl HP-UX 10.20, IRIX 6.5, OSF/1 4.0, Interix 3.5, BeOS.
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| 13 | dnl So we have to test to find something that will work.
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| 14 |
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| 15 | AC_DEFUN([gl_TYPE_SOCKLEN_T],
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| 16 | [AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])dnl
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| 17 | AC_CHECK_TYPE([socklen_t], ,
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| 18 | [AC_CACHE_CHECK([for socklen_t equivalent],
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| 19 | [gl_cv_socklen_t_equiv],
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| 20 | [# Systems have either "struct sockaddr *" or
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| 21 | # "void *" as the second argument to getpeername
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| 22 | gl_cv_socklen_t_equiv=
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| 23 | for arg2 in "struct sockaddr" void; do
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| 24 | for t in int size_t "unsigned int" "long int" "unsigned long int"; do
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| 25 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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| 26 | [[#include <sys/types.h>
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| 27 | #include <sys/socket.h>
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| 28 |
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| 29 | int getpeername (int, $arg2 *, $t *);]],
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| 30 | [[$t len;
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| 31 | getpeername (0, 0, &len);]])],
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| 32 | [gl_cv_socklen_t_equiv="$t"])
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| 33 | test "$gl_cv_socklen_t_equiv" != "" && break
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| 34 | done
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| 35 | test "$gl_cv_socklen_t_equiv" != "" && break
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| 36 | done
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| 37 | if test "$gl_cv_socklen_t_equiv" = ""; then
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| 38 | AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
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| 39 | fi
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| 40 | ])
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| 41 | AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv],
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| 42 | [type to use in place of socklen_t if not defined])],
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| 43 | [gl_SOCKET_HEADERS])])
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| 44 |
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| 45 | dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find
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| 46 | dnl it there too. But on Cygwin, wc2tcpip.h must not be included. Users
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| 47 | dnl of this module should use the same include pattern as gl_SOCKET_HEADERS.
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| 48 | dnl When you change this macro, keep also in sync:
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| 49 | dnl - gl_CHECK_SOCKET_HEADERS,
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| 50 | dnl - the Include section of modules/socklen.
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| 51 | AC_DEFUN([gl_SOCKET_HEADERS],
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| 52 | [
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| 53 | /* <sys/types.h> is not needed according to POSIX, but the
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| 54 | <sys/socket.h> in i386-unknown-freebsd4.10 and
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| 55 | powerpc-apple-darwin5.5 required it. */
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| 56 | #include <sys/types.h>
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| 57 | #if HAVE_SYS_SOCKET_H
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| 58 | # include <sys/socket.h>
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| 59 | #elif HAVE_WS2TCPIP_H
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| 60 | # include <ws2tcpip.h>
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| 61 | #endif
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| 62 | ])
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| 63 |
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| 64 | dnl Tests for the existence of the header for socket facilities.
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| 65 | dnl Defines the C macros HAVE_SYS_SOCKET_H, HAVE_WS2TCPIP_H.
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| 66 | dnl This macro must match gl_SOCKET_HEADERS.
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| 67 | AC_DEFUN([gl_CHECK_SOCKET_HEADERS],
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| 68 | [AC_CHECK_HEADERS_ONCE([sys/socket.h])
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| 69 | if test $ac_cv_header_sys_socket_h = no; then
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| 70 | dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make
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| 71 | dnl the check for those headers unconditional; yet cygwin reports
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| 72 | dnl that the headers are present but cannot be compiled (since on
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| 73 | dnl cygwin, all socket information should come from sys/socket.h).
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| 74 | AC_CHECK_HEADERS([ws2tcpip.h])
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| 75 | fi
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| 76 | ])
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