Imported from ../bash-2.02.tar.gz.

[platform/upstream/bash.git] / builtins / psize.sh

diff --git a/builtins/psize.sh b/builtins/psize.sh
index 961becd..84f1f2a 100755 (executable)
--- a/builtins/psize.sh
+++ b/builtins/psize.sh
@@ -3,6 +3,12 @@
 # psize.sh -- determine this system's pipe size, and write a define to
 #             pipesize.h so ulimit.c can use it.
 
+TMPDIR=/tmp
+TMPNAME=pipsize.$$
+TMPFILE=$TMPDIR/$TMPNAME
+
+trap 'rm -f $TMPFILE' 0 1 2 3 6 15
+
 echo "/*"
 echo " * pipesize.h"
 echo " *"
@@ -11,14 +17,20 @@ echo " * Do not edit!"
 echo " */"
 echo ""
 
-./psize.aux 2>/tmp/pipesize | sleep 3
+#
+# Try to avoid tempfile races.  We can't really check for the file's
+# existance before we run psize.aux, because `test -e' is not portable,
+# `test -h' (test for symlinks) is not portable, and `test -f' only
+# checks for regular files
+#
+rm -f $TMPFILE
+
+./psize.aux 2>$TMPFILE | sleep 3
 
-if [ -s /tmp/pipesize ]; then
-       echo "#define PIPESIZE `cat /tmp/pipesize`"
+if [ -s $TMPFILE ]; then
+       echo "#define PIPESIZE `cat $TMPFILE`"
 else
        echo "#define PIPESIZE 512"
 fi
 
-rm -f /tmp/pipesize
-
 exit 0