diff options
Diffstat (limited to 'm4/fchmodat.m4')
| -rw-r--r-- | m4/fchmodat.m4 | 48 |
1 files changed, 34 insertions, 14 deletions
diff --git a/m4/fchmodat.m4 b/m4/fchmodat.m4 index 09380327799..66c0e308fcc 100644 --- a/m4/fchmodat.m4 +++ b/m4/fchmodat.m4 @@ -1,4 +1,4 @@ -# fchmodat.m4 serial 5 +# fchmodat.m4 serial 6 dnl Copyright (C) 2004-2021 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -16,11 +16,9 @@ AC_DEFUN([gl_FUNC_FCHMODAT], HAVE_FCHMODAT=0 else AC_CACHE_CHECK( - [whether fchmodat+AT_SYMLINK_NOFOLLOW works on non-symlinks], + [whether fchmodat works], [gl_cv_func_fchmodat_works], - [dnl This test fails on GNU/Linux with glibc 2.31 (but not on - dnl GNU/kFreeBSD nor GNU/Hurd) and Cygwin 2.9. - AC_RUN_IFELSE( + [AC_RUN_IFELSE( [AC_LANG_PROGRAM( [ AC_INCLUDES_DEFAULT[ @@ -44,27 +42,49 @@ AC_DEFUN([gl_FUNC_FCHMODAT], [[ int permissive = S_IRWXU | S_IRWXG | S_IRWXO; int desired = S_IRUSR | S_IWUSR; - static char const f[] = "conftest.fchmodat"; + int result = 0; + #define file "conftest.fchmodat" struct stat st; - if (creat (f, permissive) < 0) + if (creat (file, permissive) < 0) return 1; - if (fchmodat (AT_FDCWD, f, desired, AT_SYMLINK_NOFOLLOW) != 0) + /* Test whether fchmodat rejects a trailing slash on a non-directory. + This test fails on AIX 7.2. */ + if (fchmodat (AT_FDCWD, file "/", desired, 0) == 0) + result |= 2; + /* Test whether fchmodat+AT_SYMLINK_NOFOLLOW works on non-symlinks. + This test fails on GNU/Linux with glibc 2.31 (but not on + GNU/kFreeBSD nor GNU/Hurd) and Cygwin 2.9. */ + if (fchmodat (AT_FDCWD, file, desired, AT_SYMLINK_NOFOLLOW) != 0) + result |= 4; + if (stat (file, &st) != 0) return 1; - if (stat (f, &st) != 0) - return 1; - return ! ((st.st_mode & permissive) == desired); + if ((st.st_mode & permissive) != desired) + result |= 4; + return result; ]])], [gl_cv_func_fchmodat_works=yes], - [gl_cv_func_fchmodat_works=no], + [case $? in + 2) gl_cv_func_fchmodat_works='nearly' ;; + *) gl_cv_func_fchmodat_works=no ;; + esac + ], [case "$host_os" in - dnl Guess no on Linux with glibc and Cygwin, yes otherwise. + # Guess no on Linux with glibc and Cygwin. linux-gnu* | cygwin*) gl_cv_func_fchmodat_works="guessing no" ;; + # Guess 'nearly' on AIX. + aix*) gl_cv_func_fchmodat_works="guessing nearly" ;; + # If we don't know, obey --enable-cross-guesses. *) gl_cv_func_fchmodat_works="$gl_cross_guess_normal" ;; esac ]) rm -f conftest.fchmodat]) - case $gl_cv_func_fchmodat_works in + case "$gl_cv_func_fchmodat_works" in *yes) ;; + *nearly) + AC_DEFINE([HAVE_NEARLY_WORKING_FCHMODAT], [1], + [Define to 1 if fchmodat works, except for the trailing slash handling.]) + REPLACE_FCHMODAT=1 + ;; *) AC_DEFINE([NEED_FCHMODAT_NONSYMLINK_FIX], [1], [Define to 1 if fchmodat+AT_SYMLINK_NOFOLLOW does not work right on non-symlinks.]) |