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(UTILS_FUNC_DIRFD): Rework so dirfd.c doesn't have to

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know the name of the variable in the macro definition.
This commit is contained in:
Jim Meyering
2001-11-03 18:49:27 +00:00
parent dbc3f75efa
commit ef991b4aa3
1 changed files with 21 additions and 21 deletions
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42
m4/dirfd.m4
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@@ -31,38 +31,38 @@ AC_DEFUN([UTILS_FUNC_DIRFD],
AC_REPLACE_FUNCS([dirfd])
AC_CACHE_CHECK(
[how to get the file descriptor associated with an open DIR*],
ac_cv_sys_dir_to_fd,
ac_cv_sys_dir_fd_member_name,
[
dirfd_save_DEFS=$DEFS
for ac_expr in \
\
'dir_p->d_fd' \
\
'dir_p->dd_fd' \
\
'# systems for which the info is not available' \
-1 \
; do
for ac_expr in d_fd dd_fd; do
# Skip each embedded comment.
case "$ac_expr" in '#'*) continue;; esac
DEFS="$DEFS -DDIR_TO_FD=$ac_expr"
DEFS="$DEFS -DDIR_FD_MEMBER_NAME=$ac_expr"
AC_TRY_COMPILE(
[$dirfd_headers
],
[DIR *dir_p = opendir("."); (void) ($ac_expr);],
dir_fd_done=yes
[DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;],
dir_fd_found=yes
)
DEFS=$dirfd_save_DEFS
test "$dir_fd_done" = yes && break
test "$dir_fd_found" = yes && break
done
test "$dir_fd_found" = yes || ac_expr=-1
ac_cv_sys_dir_to_fd=$ac_expr
ac_cv_sys_dir_fd_member_name=$ac_expr
]
)
AC_DEFINE_UNQUOTED(DIR_TO_FD,
$ac_cv_sys_dir_to_fd,
[the file descriptor associated with `dir_p'])
if test $ac_cv_have_decl_dirfd = -1; then
AC_DEFINE_UNQUOTED(DIR_FD_MEMBER_NAME,
$ac_cv_sys_dir_fd_member_name,
[the name of the file descriptor member of DIR])
fi
AH_VERBATIM(DIR_TO_FD,
[#ifdef DIR_FD_MEMBER_NAME
# define DIR_TO_FD(Dir_p) ((Dir_p)->DIR_FD_MEMBER_NAME)
#else
# define DIR_TO_FD(Dir_p) -1
#endif
]
)
fi
])