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84 lines
2.7 KiB
Plaintext
84 lines
2.7 KiB
Plaintext
# AC_FUNC_SELECT_ARGTYPES
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# -----------------------
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# Determine the correct type to be passed to each of the `select'
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# function's arguments, and define those types in `SELECT_TYPE_ARG1',
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# `SELECT_TYPE_ARG234', and `SELECT_TYPE_ARG5'.
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AC_DEFUN([AC_FUNC_SELECT_ARGTYPES],
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[# Common prologue for testing `select ()'.
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AC_CHECK_HEADERS(unistd.h sys/time.h sys/select.h sys/socket.h)
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ac_func_select_argtypes_includes="\
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#include <sys/types.h>
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#if HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if HAVE_SYS_SELECT_H
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# include <sys/select.h>
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#endif
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#if HAVE_SYS_SOCKET_H
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# include <sys/socket.h>
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#endif"
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# 1. Looking for the types of the arguments.
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AC_CACHE_CHECK([types of arguments for select],
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[ac_cv_func_select_args],
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[for ac_arg234 in 'fd_set *' 'int *' 'void *'; do
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for ac_arg1 in 'int' 'size_t' 'unsigned long' 'unsigned'; do
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for ac_arg5 in 'struct timeval *' 'const struct timeval *'; do
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[$ac_func_select_argtypes_includes
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#ifdef __STDC__
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extern int select ($ac_arg1,
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$ac_arg234, $ac_arg234, $ac_arg234,
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$ac_arg5);
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#else
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extern int select ();
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$ac_arg1 s;
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$ac_arg234 p;
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$ac_arg5 t;
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#endif
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])],
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[ac_cv_func_select_args="$ac_arg1,$ac_arg234,$ac_arg5"; break 3])
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done
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done
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done
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# Provide a safe default value.
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: ${ac_cv_func_select_args='int,int *,struct timeval *'}
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])
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ac_save_IFS=$IFS; IFS=','
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set dummy `echo "$ac_cv_func_select_args" | sed 's/\*/\*/g'`
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IFS=$ac_save_IFS
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shift
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AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG1, $[1],
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[Define to the type of arg 1 for `select'.])
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AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG234, ($[2]),
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[Define to the type of args 2, 3 and 4 for `select'.])
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AC_DEFINE_UNQUOTED(SELECT_TYPE_ARG5, ($[3]),
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[Define to the type of arg 5 for `select'.])
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# 2. Is `fd_set' defined?
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ac_cast=
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if test "$[2]" != fd_set; then
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# Arguments 2-4 are not fd_set. Some weirdo systems use fd_set type
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# for FD_SET macros, but insist that you cast the argument to
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# select. I don't understand why that might be, but it means we
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# cannot define fd_set.
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AC_CHECK_TYPE([fd_set],
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[AC_DEFINE_UNQUOTED(fd_set, $[2],
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[Define if the type of arguments 2, 3 and 4
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to `select' is `fd_set' and `fd_set' is
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not defined.])
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ac_cast="($[2] *)"],
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[],
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[$ac_func_select_argtypes_includes])
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fi
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# 3. Define the cast.
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AC_DEFINE_UNQUOTED(SELECT_FD_SET_CAST, $ac_cast,
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[Define if the type in arguments 2, 3 and 4 to `select' is
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`fd_set'.])
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])# AC_FUNC_SELECT_ARGTYPES
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