1 files changed, 125 insertions, 0 deletions
diff --git a/tests/misc/stdbuf.sh b/tests/misc/stdbuf.sh
new file mode 100755
index 0000000..2d50dbe
--- /dev/null
+++ b/tests/misc/stdbuf.sh
@@ -0,0 +1,125 @@
+#!/bin/sh
+# Exercise stdbuf functionality
+
+# Copyright (C) 2009-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ stdbuf
+
+getlimits_
+
+# stdbuf fails when the absolute top build dir name contains e.g.,
+# space, TAB, NL
+lf='
+'
+case $abs_top_builddir in
+  *[\\\"\#\$\&\'\`$lf\ \	]*)
+    skip_ "unsafe absolute build directory name: $abs_top_builddir";;
+esac
+
+# Use a fifo rather than a pipe in the tests below
+# so that the producer (uniq) will wait until the
+# consumer (dd) opens the fifo therefore increasing
+# the chance that dd will read the data from each
+# write separately.
+mkfifo_or_skip_ fifo
+
+
+# Verify input parameter checking
+stdbuf -o1 true || fail=1 # verify size syntax
+stdbuf -oK true || fail=1 # verify size syntax
+stdbuf -o0 true || fail=1 # verify unbuffered syntax
+stdbuf -oL true || fail=1 # verify line buffered syntax
+
+# Capital 'L' required
+# Internal error is a particular status
+returns_ 125 stdbuf -ol true || fail=1
+
+returns_ 125 stdbuf -o$SIZE_OFLOW true || fail=1 # size too large
+returns_ 125 stdbuf -iL true || fail=1 # line buffering stdin disallowed
+returns_ 125 stdbuf true || fail=1 # a buffering mode must be specified
+stdbuf -i0 -o0 -e0 true || fail=1 #check all files
+returns_ 126 stdbuf -o1 . || fail=1 # invalid command
+returns_ 127 stdbuf -o1 no_such || fail=1 # no such command
+
+# Terminate any background processes
+cleanup_() { kill $pid 2>/dev/null && wait $pid; }
+
+# Ensure line buffering stdout takes effect
+stdbuf_linebuffer()
+{
+  local delay="$1"
+
+  printf '1\n' > exp
+  > out || framework_failure_
+  dd count=1 if=fifo > out 2> err & pid=$!
+  (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -oL uniq > fifo
+  wait $pid
+  compare exp out
+}
+
+retry_delay_ stdbuf_linebuffer .1 6 || fail=1
+
+stdbuf_unbuffer()
+{
+  local delay="$1"
+
+  # Ensure un buffering stdout takes effect
+  printf '1\n' > exp
+  > out || framework_failure_
+  dd count=1 if=fifo > out 2> err & pid=$!
+  (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o0 uniq > fifo
+  wait $pid
+  compare exp out
+}
+
+retry_delay_ stdbuf_unbuffer .1 6 || fail=1
+
+# Ensure un buffering stdin takes effect
+#  The following works for me, but is racy.  I.e., we're depending
+#  on dd to run and close the fifo before the second write by uniq.
+#  If we add a sleep, then we're just testing -oL
+    # printf '3\n' > exp
+    # dd count=1 if=fifo > /dev/null 2> err &
+    # printf '1\n\2\n3\n' | (stdbuf -i0 -oL uniq > fifo; cat) > out
+    # wait # for dd to complete
+    # compare exp out || fail=1
+#  One could remove the need for dd (used to close the fifo to get uniq to quit
+#  early), if head -n1 read stdin char by char. Note uniq | head -c2 doesn't
+#  suffice due to the buffering implicit in the pipe.  sed currently does read
+#  stdin char by char, so we can test with 'sed 1q'.  However I'm wary about
+#  adding this dependency on a program outside of coreutils.
+    # printf '2\n' > exp
+    # printf '1\n2\n' | (stdbuf -i0 sed 1q >/dev/null; cat) > out
+    # compare exp out || fail=1
+
+# Ensure block buffering stdout takes effect
+# We don't currently test block buffering failures as
+# this doesn't work on GLIBC-2.7 or GLIBC-2.9 at least.
+   # stdbuf_blockbuffer()
+   # {
+   #   local delay="$1"
+   #
+   #   printf '1\n2\n' > exp
+   #   dd count=1 if=fifo > out 2> err &
+   #   (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o4 uniq > fifo
+   #   wait # for dd to complete
+   #   compare exp out
+   # }
+   #
+   # retry_delay_ stdbuf_blockbuffer .1 6 || fail=1
+
+Exit $fail