X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Ffsusage.m4;h=b0a283b1131af07fda65596046fff61865745949;hb=d175970f402a07706f7cf82b032be5037b2cebb5;hp=e5caa7f3842f6bfe6c3395d2d83c08bd7fafc7b6;hpb=c7cf9dc07ccf6755c0a2fc1aa29322d0a7a31478;p=gnulib.git

diff --git a/m4/fsusage.m4 b/m4/fsusage.m4
index e5caa7f38..b0a283b11 100644
--- a/m4/fsusage.m4
+++ b/m4/fsusage.m4
@@ -1,14 +1,25 @@
-#serial 6
+#serial 12
 
 # From fileutils/configure.in
 
+AC_DEFUN([gl_FSUSAGE],
+[
+  AC_CHECK_HEADERS_ONCE(sys/param.h)
+  AC_CHECK_HEADERS(sys/mount.h sys/vfs.h sys/fs_types.h)
+  gl_FILE_SYSTEM_USAGE([gl_cv_fs_space=yes], [gl_cv_fs_space=no])
+  if test $gl_cv_fs_space = yes; then
+    AC_LIBOBJ(fsusage)
+    gl_PREREQ_FSUSAGE_EXTRA
+  fi
+])
+
 # Try to determine how a program can obtain filesystem usage information.
 # If successful, define the appropriate symbol (see fsusage.c) and
 # execute ACTION-IF-FOUND.  Otherwise, execute ACTION-IF-NOT-FOUND.
 #
-# jm_FILE_SYSTEM_USAGE([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
+# gl_FILE_SYSTEM_USAGE([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
 
-AC_DEFUN(jm_FILE_SYSTEM_USAGE,
+AC_DEFUN([gl_FILE_SYSTEM_USAGE],
 [
 
 echo "checking how to get filesystem space usage..."
@@ -24,6 +35,11 @@ if test $ac_fsusage_space = no; then
   # SVR4
   AC_CACHE_CHECK([for statvfs function (SVR4)], fu_cv_sys_stat_statvfs,
 		 [AC_TRY_LINK([#include <sys/types.h>
+#ifdef __GLIBC__
+Do not use statvfs on systems with GNU libc, because that function stats
+all preceding entries in /proc/mounts, and that makes df hang if even
+one of the corresponding file systems is hard-mounted, but not available.
+#endif
 #include <sys/statvfs.h>],
 			      [struct statvfs fsd; statvfs (0, &fsd);],
 			      fu_cv_sys_stat_statvfs=yes,
@@ -188,12 +204,43 @@ if test $ac_fsusage_space = no; then
     ac_fsusage_space=yes)
 fi
 
-dnl FIXME: this should use AS_IF instead:
-dnl AS_IF([test $ac_fsusage_space = found], [$1], [$2])
-if test $ac_fsusage_space = yes; then
-$1
-else
-$2
-fi
+AS_IF([test $ac_fsusage_space = yes], [$1], [$2])
+
+])
+
 
+# Check for SunOS statfs brokenness wrt partitions 2GB and larger.
+# If <sys/vfs.h> exists and struct statfs has a member named f_spare,
+# enable the work-around code in fsusage.c.
+AC_DEFUN([gl_STATFS_TRUNCATES],
+[
+  AC_MSG_CHECKING([for statfs that truncates block counts])
+  AC_CACHE_VAL(fu_cv_sys_truncating_statfs,
+  [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+#if !defined(sun) && !defined(__sun)
+choke -- this is a workaround for a Sun-specific problem
+#endif
+#include <sys/types.h>
+#include <sys/vfs.h>]],
+    [[struct statfs t; long c = *(t.f_spare);]])],
+    [fu_cv_sys_truncating_statfs=yes],
+    [fu_cv_sys_truncating_statfs=no])])
+  if test $fu_cv_sys_truncating_statfs = yes; then
+    AC_DEFINE(STATFS_TRUNCATES_BLOCK_COUNTS, 1,
+      [Define if the block counts reported by statfs may be truncated to 2GB
+       and the correct values may be stored in the f_spare array.
+       (SunOS 4.1.2, 4.1.3, and 4.1.3_U1 are reported to have this problem.
+       SunOS 4.1.1 seems not to be affected.)])
+  fi
+  AC_MSG_RESULT($fu_cv_sys_truncating_statfs)
+])
+
+
+# Prerequisites of lib/fsusage.c not done by gl_FILE_SYSTEM_USAGE.
+AC_DEFUN([gl_PREREQ_FSUSAGE_EXTRA],
+[
+  AC_REQUIRE([gl_AC_TYPE_UINTMAX_T])
+  AC_CHECK_HEADERS_ONCE(fcntl.h)
+  AC_CHECK_HEADERS(dustat.h sys/fs/s5param.h sys/filsys.h sys/statfs.h sys/statvfs.h)
+  gl_STATFS_TRUNCATES
 ])