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-rw-r--r--m4/socklen.m452
1 files changed, 52 insertions, 0 deletions
diff --git a/m4/socklen.m4 b/m4/socklen.m4
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+++ b/m4/socklen.m4
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+# socklen.m4 serial 4
+dnl Copyright (C) 2005, 2006 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Albert Chin, Windows fixes from Simon Josefsson.
+
+dnl Check for socklen_t: historically on BSD it is an int, and in
+dnl POSIX 1g it is a type of its own, but some platforms use different
+dnl types for the argument to getsockopt, getpeername, etc. So we
+dnl have to test to find something that will work.
+
+dnl On mingw32, socklen_t is in ws2tcpip.h ('int'), so we try to find
+dnl it there first. That file is included by gnulib's socket_.h, which
+dnl all users of this module should include. Cygwin must not include
+dnl ws2tcpip.h.
+AC_DEFUN([gl_TYPE_SOCKLEN_T],
+ [AC_REQUIRE([gl_HEADER_SYS_SOCKET])dnl
+ AC_CHECK_TYPE([socklen_t], ,
+ [AC_MSG_CHECKING([for socklen_t equivalent])
+ AC_CACHE_VAL([gl_cv_gl_cv_socklen_t_equiv],
+ [# Systems have either "struct sockaddr *" or
+ # "void *" as the second argument to getpeername
+ gl_cv_socklen_t_equiv=
+ for arg2 in "struct sockaddr" void; do
+ for t in int size_t "unsigned int" "long int" "unsigned long int"; do
+ AC_TRY_COMPILE(
+ [#include <sys/types.h>
+ #include <sys/socket.h>
+
+ int getpeername (int, $arg2 *, $t *);],
+ [$t len;
+ getpeername (0, 0, &len);],
+ [gl_cv_socklen_t_equiv="$t"])
+ test "$gl_cv_socklen_t_equiv" != "" && break
+ done
+ test "$gl_cv_socklen_t_equiv" != "" && break
+ done
+ ])
+ if test "$gl_cv_socklen_t_equiv" = ""; then
+ AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
+ fi
+ AC_MSG_RESULT([$gl_cv_socklen_t_equiv])
+ AC_DEFINE_UNQUOTED([socklen_t], [$gl_cv_socklen_t_equiv],
+ [type to use in place of socklen_t if not defined])],
+ [#include <sys/types.h>
+ #if HAVE_SYS_SOCKET_H
+ # include <sys/socket.h>
+ #elif HAVE_WS2TCPIP_H
+ # include <ws2tcpip.h>
+ #endif])])