tests/misc/stdbuf

   1 #!/bin/sh
   2 # Exercise stdbuf functionality
   3
   4 # Copyright (C) 2009-2010 Free Software Foundation, Inc.
   5
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  20 print_ver_ stdbuf mv
  21
  22 getlimits_
  23 require_built_ stdbuf
  24
  25 # stdbuf fails when the absolute top build dir name contains e.g., space, TAB, NL
  26 lf='
  27 '
  28 case $abs_top_builddir in
  29   *[\\\"\#\$\&\'\`$lf\ \        ]*)
  30     skip_test_ "unsafe absolute build directory name: $abs_top_builddir";;
  31 esac
  32
  33 # Use a fifo rather than a pipe in the tests below
  34 # so that the producer (uniq) will wait until the
  35 # consumer (dd) opens the fifo therefore increasing
  36 # the chance that dd will read the data from each
  37 # write separately.
  38 mkfifo fifo || framework_failure
  39
  40
  41 # Verify input parameter checking
  42 stdbuf -o1 true || fail=1 # verify size syntax
  43 stdbuf -oK true || fail=1 # verify size syntax
  44 stdbuf -o0 true || fail=1 # verify unbuffered syntax
  45 stdbuf -oL true || fail=1 # verify line buffered syntax
  46 stdbuf -ol true # Capital 'L' required
  47 test $? = 125 || fail=1 # Internal error is a particular status
  48 stdbuf -o$SIZE_OFLOW true # size too large
  49 test $? = 125 || fail=1
  50 stdbuf -iL true # line buffering stdin disallowed
  51 test $? = 125 || fail=1
  52 stdbuf -i0 -o0 -e0 true || fail=1 #check all files
  53 stdbuf -o1 . # invalid command
  54 test $? = 126 || fail=1
  55 stdbuf -o1 no_such # no such command
  56 test $? = 127 || fail=1
  57
  58 # Ensure line buffering stdout takes effect
  59 stdbuf_linebuffer()
  60 {
  61   local delay="$1"
  62
  63   printf '1\n' > exp
  64   dd count=1 if=fifo > out 2> err &
  65   (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -oL uniq > fifo
  66   wait # for dd to complete
  67   compare out exp
  68 }
  69
  70 retry_delay_ stdbuf_linebuffer .1 6 || fail=1
  71
  72 stdbuf_unbuffer()
  73 {
  74   local delay="$1"
  75
  76   # Ensure un buffering stdout takes effect
  77   printf '1\n' > exp
  78   dd count=1 if=fifo > out 2> err &
  79   (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o0 uniq > fifo
  80   wait # for dd to complete
  81   compare out exp
  82 }
  83
  84 retry_delay_ stdbuf_unbuffer .1 6 || fail=1
  85
  86 # Ensure un buffering stdin takes effect
  87 #  The following works for me, but is racy. I.E. we're depending
  88 #  on dd to run and close the fifo before the second write by uniq.
  89 #  If we add a sleep, then we're just testing -oL
  90     # printf '3\n' > exp
  91     # dd count=1 if=fifo > /dev/null 2> err &
  92     # printf '1\n\2\n3\n' | (stdbuf -i0 -oL uniq > fifo; cat) > out
  93     # wait # for dd to complete
  94     # compare out exp || fail=1
  95 #  One could remove the need for dd (used to close the fifo to get uniq to quit
  96 #  early), if head -n1 read stdin char by char. Note uniq | head -c2 doesn't
  97 #  suffice due to the buffering implicit in the pipe.  sed currently does read
  98 #  stdin char by char, so we can test with `sed 1q`.  However I'm wary about
  99 #  adding this dependency on a program outside of coreutils.
 100     # printf '2\n' > exp
 101     # printf '1\n2\n' | (stdbuf -i0 sed 1q >/dev/null; cat) > out
 102     # compare out exp || fail=1
 103
 104 # Ensure block buffering stdout takes effect
 105 # We don't currently test block buffering failures as
 106 # this doesn't work on on GLIBC-2.7 or GLIBC-2.9 at least.
 107    # stdbuf_blockbuffer()
 108    # {
 109    #   local delay="$1"
 110    #
 111    #   printf '1\n2\n' > exp
 112    #   dd count=1 if=fifo > out 2> err &
 113    #   (printf '1\n'; sleep $delay; printf '2\n') | stdbuf -o4 uniq > fifo
 114    #   wait # for dd to complete
 115    #   compare out exp
 116    # }
 117    #
 118    # retry_delay_ stdbuf_blockbuffer .1 6 || fail=1
 119
 120 Exit $fail