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