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| author | Jim Meyering <jim@meyering.net> | 2001-11-01 16:41:57 +0000 |
|---|---|---|
| committer | Jim Meyering <jim@meyering.net> | 2001-11-01 16:41:57 +0000 |
| commit | 7e7fa1da8c3471b86ff76898f4e73d2c43bcd6e8 (patch) | |
| tree | 6b05d1fb2d628ea17e378d0b7a6ee2fdac14c276 /m4/dirfd.m4 | |
| parent | 7c6a48b9fd02bb0efedee0a44155a4e59bd670e6 (diff) | |
| download | gnulib-7e7fa1da8c3471b86ff76898f4e73d2c43bcd6e8.tar.gz | |
(UTILS_FUNC_DIRFD): New macro.
Diffstat (limited to 'm4/dirfd.m4')
| -rw-r--r-- | m4/dirfd.m4 | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/m4/dirfd.m4 b/m4/dirfd.m4 new file mode 100644 index 0000000000..b62e12a54f --- /dev/null +++ b/m4/dirfd.m4 @@ -0,0 +1,49 @@ +#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_REPLACE_FUNCS([dirfd]) + if test $ac_cv_func_dirfd = no; then + AC_CACHE_CHECK( + [how to get the file descriptor associated with an open DIR*], + ac_cv_sys_dir_to_fd, + [ + dirfd_save_DEFS=$DEFS + for ac_expr in \ + \ + '# Solaris' \ + 'dir_p->d_fd' \ + \ + '# Solaris' \ + 'dir_p->dd_fd' \ + \ + '# systems for which the info is not available' \ + -1 \ + ; do + + # Skip each embedded comment. + case "$ac_expr" in '#'*) continue;; esac + + DEFS="$DEFS -DDIR_TO_FD=$ac_expr" + AC_TRY_COMPILE( + [#include <sys/types.h> + #include <dirent.h> + ], + [DIR *dir_p = opendir("."); (void) ($ac_expr);], + dir_fd_done=yes + ) + DEFS=$dirfd_save_DEFS + test "$dir_fd_done" = yes && break + done + + ac_cv_sys_dir_to_fd=$ac_expr + ] + ) + AC_DEFINE_UNQUOTED(DIR_TO_FD, + $ac_cv_sys_dir_to_fd, + [the file descriptor associated with `dir_p']) + fi +]) |