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1 | # socklen.m4 serial 11 |
2 | dnl Copyright (C) 2005-2007, 2009-2019 Free Software Foundation, Inc. | |
725e2999 JB |
3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | dnl From Albert Chin, Windows fixes from Simon Josefsson. | |
8 | ||
9 | dnl Check for socklen_t: historically on BSD it is an int, and in | |
10 | dnl POSIX 1g it is a type of its own, but some platforms use different | |
11 | dnl types for the argument to getsockopt, getpeername, etc.: | |
12 | dnl HP-UX 10.20, IRIX 6.5, OSF/1 4.0, Interix 3.5, BeOS. | |
13 | dnl So we have to test to find something that will work. | |
14 | ||
15 | AC_DEFUN([gl_TYPE_SOCKLEN_T], | |
16 | [AC_REQUIRE([gl_CHECK_SOCKET_HEADERS])dnl | |
17 | AC_CHECK_TYPE([socklen_t], , | |
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18 | [AC_CACHE_CHECK([for socklen_t equivalent], |
19 | [gl_cv_socklen_t_equiv], | |
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20 | [# Systems have either "struct sockaddr *" or |
21 | # "void *" as the second argument to getpeername | |
22 | gl_cv_socklen_t_equiv= | |
23 | for arg2 in "struct sockaddr" void; do | |
24 | for t in int size_t "unsigned int" "long int" "unsigned long int"; do | |
25 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM( | |
26 | [[#include <sys/types.h> | |
27 | #include <sys/socket.h> | |
28 | ||
29 | int getpeername (int, $arg2 *, $t *);]], | |
30 | [[$t len; | |
31 | getpeername (0, 0, &len);]])], | |
32 | [gl_cv_socklen_t_equiv="$t"]) | |
33 | test "$gl_cv_socklen_t_equiv" != "" && break | |
34 | done | |
35 | test "$gl_cv_socklen_t_equiv" != "" && break | |
36 | done | |
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37 | if test "$gl_cv_socklen_t_equiv" = ""; then |
38 | AC_MSG_ERROR([Cannot find a type to use in place of socklen_t]) | |
39 | fi | |
40 | ]) | |
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41 | AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv], |
42 | [type to use in place of socklen_t if not defined])], | |
43 | [gl_SOCKET_HEADERS])]) | |
44 | ||
45 | dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find | |
46 | dnl it there too. But on Cygwin, wc2tcpip.h must not be included. Users | |
47 | dnl of this module should use the same include pattern as gl_SOCKET_HEADERS. | |
48 | dnl When you change this macro, keep also in sync: | |
49 | dnl - gl_CHECK_SOCKET_HEADERS, | |
50 | dnl - the Include section of modules/socklen. | |
51 | AC_DEFUN([gl_SOCKET_HEADERS], | |
52 | [ | |
53 | /* <sys/types.h> is not needed according to POSIX, but the | |
54 | <sys/socket.h> in i386-unknown-freebsd4.10 and | |
55 | powerpc-apple-darwin5.5 required it. */ | |
56 | #include <sys/types.h> | |
57 | #if HAVE_SYS_SOCKET_H | |
58 | # include <sys/socket.h> | |
59 | #elif HAVE_WS2TCPIP_H | |
60 | # include <ws2tcpip.h> | |
61 | #endif | |
62 | ]) | |
63 | ||
64 | dnl Tests for the existence of the header for socket facilities. | |
65 | dnl Defines the C macros HAVE_SYS_SOCKET_H, HAVE_WS2TCPIP_H. | |
66 | dnl This macro must match gl_SOCKET_HEADERS. | |
67 | AC_DEFUN([gl_CHECK_SOCKET_HEADERS], | |
68 | [AC_CHECK_HEADERS_ONCE([sys/socket.h]) | |
69 | if test $ac_cv_header_sys_socket_h = no; then | |
70 | dnl We cannot use AC_CHECK_HEADERS_ONCE here, because that would make | |
71 | dnl the check for those headers unconditional; yet cygwin reports | |
72 | dnl that the headers are present but cannot be compiled (since on | |
73 | dnl cygwin, all socket information should come from sys/socket.h). | |
74 | AC_CHECK_HEADERS([ws2tcpip.h]) | |
75 | fi | |
76 | ]) |