Commit | Line | Data |
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8912421c | 1 | # socklen.m4 serial 7 |
61cd9dc9 | 2 | dnl Copyright (C) 2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc. |
8912421c LC |
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. So we | |
12 | dnl have to test to find something that will work. | |
13 | ||
14 | dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find | |
15 | dnl it there first. That file is included by gnulib's sys_socket.in.h, which | |
16 | dnl all users of this module should include. Cygwin must not include | |
17 | dnl ws2tcpip.h. | |
18 | AC_DEFUN([gl_TYPE_SOCKLEN_T], | |
19 | [AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl | |
20 | AC_CHECK_TYPE([socklen_t], , | |
21 | [AC_MSG_CHECKING([for socklen_t equivalent]) | |
22 | AC_CACHE_VAL([gl_cv_socklen_t_equiv], | |
1cd4fffc LC |
23 | [# Systems have either "struct sockaddr *" or |
24 | # "void *" as the second argument to getpeername | |
25 | gl_cv_socklen_t_equiv= | |
26 | for arg2 in "struct sockaddr" void; do | |
27 | for t in int size_t "unsigned int" "long int" "unsigned long int"; do | |
28 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM( | |
8912421c LC |
29 | [[#include <sys/types.h> |
30 | #include <sys/socket.h> | |
31 | ||
32 | int getpeername (int, $arg2 *, $t *);]], | |
33 | [[$t len; | |
34 | getpeername (0, 0, &len);]])], | |
1cd4fffc LC |
35 | [gl_cv_socklen_t_equiv="$t"]) |
36 | test "$gl_cv_socklen_t_equiv" != "" && break | |
37 | done | |
38 | test "$gl_cv_socklen_t_equiv" != "" && break | |
39 | done | |
8912421c LC |
40 | ]) |
41 | if test "$gl_cv_socklen_t_equiv" = ""; then | |
1cd4fffc | 42 | AC_MSG_ERROR([Cannot find a type to use in place of socklen_t]) |
8912421c LC |
43 | fi |
44 | AC_MSG_RESULT([$gl_cv_socklen_t_equiv]) | |
45 | AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv], | |
1cd4fffc | 46 | [type to use in place of socklen_t if not defined])], |
8912421c LC |
47 | [#include <sys/types.h> |
48 | #if HAVE_SYS_SOCKET_H | |
49 | # include <sys/socket.h> | |
50 | #elif HAVE_WS2TCPIP_H | |
51 | # include <ws2tcpip.h> | |
52 | #endif])]) |