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* tests/test-lib.sh (Exit): New function by Ralf Wildenhues in automake http://git.sv.gnu.org/gitweb/?p=automake.git;a=commitdiff;h=20594c08f63 * tests/**: Convert all uses: This restrictive change converted the vast majority: git grep -l '^(exit \$fail); exit \$fail$' \ | xargs perl -pi -e 's/'^\(exit \$fail\); exit \$fail$/Exit \$fail/' And this did the rest, plus a few undesirable ones, so I manually backed out the changes to ChangeLog-* and build-aux/check.mk: git grep -l -E '\(exit [^)]+\); exit ' \ | xargs perl -pi -e 's/\(exit (.+?)\); exit \1/Exit $1/'
91 lines
3.3 KiB
Bash
Executable File
91 lines
3.3 KiB
Bash
Executable File
#!/bin/sh
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# Detect printf(3) failure even when it doesn't set stream error indicator
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# Copyright (C) 2007-2008 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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prog=printf
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if test "$VERBOSE" = yes; then
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set -x
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env $prog --version
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fi
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. $srcdir/test-lib.sh
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require_ulimit_
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fail=0
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# Up to coreutils-6.9, "printf %.Nf 0" would encounter an ENOMEM internal
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# error from glibc's printf(3) function whenever N was large relative to
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# the size of available memory. As of Oct 2007, that internal stream-
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# related failure was not reflected (for any libc I know of) in the usual
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# stream error indicator that is tested by ferror. The result was that
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# while the printf command obviously failed (generated no output),
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# it mistakenly exited successfully (exit status of 0).
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# Testing it is tricky, because there is so much variance
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# in quality for this corner of printf(3) implementations.
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# Most implementations do attempt to allocate N bytes of storage.
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# Using the maximum value for N (2^31-1) causes glibc-2.7 to try to
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# allocate almost 2^64 bytes, while freeBSD 6.1's implementation
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# correctly outputs almost 2GB worth of 0's, which takes too long.
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# We want to test implementations that allocate N bytes, but without
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# triggering the above extremes.
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# Some other versions of glibc-2.7 have a snprintf function that segfaults
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# when an internal (technically unnecessary!) memory allocation fails.
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# The compromise is to limit virtual memory to something reasonable,
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# and to make an N-byte-allocating-printf require more than that, thus
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# triggering the printf(3) misbehavior -- which, btw, is required by ISO C99.
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mkfifo fifo || framework_failure
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head -c 10 fifo > out &
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( ulimit -v 10000; env $prog %20000000f 0 2>err-msg > fifo )
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exit=$?
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# Map this longer, and rarer, diagnostic to the common one.
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# printf: cannot perform formatted output: Cannot allocate memory" \
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sed 's/cannot perform .*/write error/' err-msg > k && mv k err-msg
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err_msg=$(cat err-msg|tr '\n' :)
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# By some bug, on Solaris 11 (5.11 snv_86), err_msg ends up
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# containing '1> fifo:printf: write error:'. Recognize that, too.
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case $err_msg in
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"$prog: write error:") diagnostic=y ;;
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"1> fifo:$prog: write error:") diagnostic=y ;;
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'') diagnostic=n ;;
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*) diagnostic=unexpected ;;
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esac
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n_out=$(wc -c < out)
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case $n_out:$diagnostic:$exit in
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10:n:0) ;; # ok, succeeds w/no diagnostic: FreeBSD 6.1
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0:y:1) ;; # ok, glibc-2.8 and newer, when printf(3) fails with ENOMEM
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*:139) # segfault; known bug at least in debian unstable's libc6 2.7-11
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echo 1>&2 "$0: bug in snprintf causes low-mem use of printf to segfault"
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fail=77;;
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# 10:y) ;; # Fail: doesn't happen: nobody succeeds with a diagnostic
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# 0:n) ;; # Fail pre-patch: no output, no diag
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*) fail=1;;
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esac
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Exit $fail
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