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# $PostgreSQL: pgsql/config/ac_func_accept_argtypes.m4,v 1.6 2003-11-29 19:51:17 pgsql Exp $
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# This comes from the official Autoconf macro archive at
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# <http://research.cys.de/autoconf-archive/>
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# (I removed the $ before the Id CVS keyword below.)
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dnl @synopsis AC_FUNC_ACCEPT_ARGTYPES
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dnl Checks the data types of the three arguments to accept(). Results are
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dnl placed into the symbols ACCEPT_TYPE_RETURN and ACCEPT_TYPE_ARG[123],
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dnl consistent with the following example:
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dnl #define ACCEPT_TYPE_RETURN int
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dnl #define ACCEPT_TYPE_ARG1 int
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dnl #define ACCEPT_TYPE_ARG2 struct sockaddr *
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dnl #define ACCEPT_TYPE_ARG3 socklen_t
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dnl This macro requires AC_CHECK_HEADERS to have already verified the
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dnl presence or absence of sys/types.h and sys/socket.h.
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dnl NOTE: This is just a modified version of the AC_FUNC_SELECT_ARGTYPES
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dnl macro. Credit for that one goes to David MacKenzie et. al.
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dnl @version Id: ac_func_accept_argtypes.m4,v 1.1 1999/12/03 11:29:29 simons Exp $
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dnl @author Daniel Richard G. <skunk@mit.edu>
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# PostgreSQL local changes: In the original version ACCEPT_TYPE_ARG3
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# is a pointer type. That's kind of useless because then you can't
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# use the macro to define a corresponding variable. We also make the
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# reasonable(?) assumption that you can use arg3 for getsocktype etc.
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# as well (i.e., anywhere POSIX.2 has socklen_t).
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# arg2 can also be `const' (e.g., RH 4.2). Change the order of tests
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# for arg3 so that `int' is first, in case there is no prototype at all.
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# Solaris 7 and 8 have arg3 as 'void *' (disguised as 'Psocklen_t'
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# which is *not* 'socklen_t *'). If we detect that, then we assume
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# 'int' as the result, because that ought to work best.
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# On Win32, accept() returns 'unsigned int PASCAL'
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AC_DEFUN([AC_FUNC_ACCEPT_ARGTYPES],
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[AC_MSG_CHECKING([types of arguments for accept()])
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AC_CACHE_VAL(ac_cv_func_accept_return,dnl
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[AC_CACHE_VAL(ac_cv_func_accept_arg1,dnl
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[AC_CACHE_VAL(ac_cv_func_accept_arg2,dnl
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[AC_CACHE_VAL(ac_cv_func_accept_arg3,dnl
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[for ac_cv_func_accept_return in 'int' 'unsigned int PASCAL'; do
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for ac_cv_func_accept_arg1 in 'int' 'unsigned int'; do
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for ac_cv_func_accept_arg2 in 'struct sockaddr *' 'const struct sockaddr *' 'void *'; do
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for ac_cv_func_accept_arg3 in 'int' 'size_t' 'socklen_t' 'unsigned int' 'void'; do
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[#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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extern $ac_cv_func_accept_return accept ($ac_cv_func_accept_arg1, $ac_cv_func_accept_arg2, $ac_cv_func_accept_arg3 *);],
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[], [ac_not_found=no; break 4], [ac_not_found=yes])
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if test "$ac_not_found" = yes; then
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AC_MSG_ERROR([could not determine argument types])
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if test "$ac_cv_func_accept_arg3" = "void"; then
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ac_cv_func_accept_arg3=int
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AC_MSG_RESULT([$ac_cv_func_accept_return, $ac_cv_func_accept_arg1, $ac_cv_func_accept_arg2, $ac_cv_func_accept_arg3 *])
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AC_DEFINE_UNQUOTED(ACCEPT_TYPE_RETURN, $ac_cv_func_accept_return,
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[Define to the return type of 'accept'])
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AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG1, $ac_cv_func_accept_arg1,
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[Define to the type of arg 1 of 'accept'])
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AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG2, $ac_cv_func_accept_arg2,
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[Define to the type of arg 2 of 'accept'])
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AC_DEFINE_UNQUOTED(ACCEPT_TYPE_ARG3, $ac_cv_func_accept_arg3,
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[Define to the type of arg 3 of 'accept'])