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#serial 1
dnl Find out how to get the file descriptor associated with an open DIR*.
dnl From Jim Meyering
AC_DEFUN([UTILS_FUNC_DIRFD],
[
AC_HEADER_DIRENT
dirfd_headers='
#if HAVE_DIRENT_H
# include <dirent.h>
#else /* not HAVE_DIRENT_H */
# define dirent direct
# if HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif /* HAVE_SYS_NDIR_H */
# if HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif /* HAVE_SYS_DIR_H */
# if HAVE_NDIR_H
# include <ndir.h>
# endif /* HAVE_NDIR_H */
#endif /* HAVE_DIRENT_H */
'
AC_CHECK_FUNCS(dirfd)
AC_CHECK_DECLS([dirfd], , , $dirfd_headers)
# Use the replacement only if we have neither the function
# nor a declaration.
if test $ac_cv_func_dirfd,$ac_cv_have_decl_dirfd = no,no; then
AC_REPLACE_FUNCS([dirfd])
AC_CACHE_CHECK(
[how to get the file descriptor associated with an open DIR*],
ac_cv_sys_dir_fd_member_name,
[
dirfd_save_CFLAGS=$CFLAGS
for ac_expr in d_fd dd_fd; do
CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
AC_TRY_COMPILE(
[$dirfd_headers
],
[DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;],
dir_fd_found=yes
)
CFLAGS=$dirfd_save_CFLAGS
test "$dir_fd_found" = yes && break
done
test "$dir_fd_found" = yes || ac_expr=-1
ac_cv_sys_dir_fd_member_name=$ac_expr
]
)
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
])
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