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      1 #!/bin/sh
      2 #
      3 # Ensure that strace can detach from stopped processes.
      4 #
      5 # Copyright (c) 2013-2015 Dmitry V. Levin <ldv (at] altlinux.org>
      6 # Copyright (c) 2014-2017 The strace developers.
      7 # All rights reserved.
      8 #
      9 # Redistribution and use in source and binary forms, with or without
     10 # modification, are permitted provided that the following conditions
     11 # are met:
     12 # 1. Redistributions of source code must retain the above copyright
     13 #    notice, this list of conditions and the following disclaimer.
     14 # 2. Redistributions in binary form must reproduce the above copyright
     15 #    notice, this list of conditions and the following disclaimer in the
     16 #    documentation and/or other materials provided with the distribution.
     17 # 3. The name of the author may not be used to endorse or promote products
     18 #    derived from this software without specific prior written permission.
     19 #
     20 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     21 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     22 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     23 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     24 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     25 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     26 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     27 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     29 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 
     31 . "${srcdir=.}/init.sh"
     32 
     33 run_prog_skip_if_failed \
     34 	kill -0 $$
     35 
     36 check_prog sleep
     37 
     38 $STRACE -d -enone / > /dev/null 2> "$LOG"
     39 if grep -x "[^:]*strace: PTRACE_SEIZE doesn't work" "$LOG" > /dev/null; then
     40 	skip_ "PTRACE_SEIZE doesn't work"
     41 fi
     42 
     43 set -e
     44 
     45 > "$LOG"
     46 ../set_ptracer_any sleep $((2*$TIMEOUT_DURATION)) > "$LOG" &
     47 
     48 while ! [ -s "$LOG" ]; do
     49 	kill -0 $! 2> /dev/null ||
     50 		fail_ 'set_ptracer_any sleep failed'
     51 	$SLEEP_A_BIT
     52 done
     53 
     54 tracee_pid=$!
     55 kill -STOP $tracee_pid
     56 
     57 cleanup()
     58 {
     59 	set +e
     60 	kill $tracee_pid
     61 	kill -CONT $tracee_pid
     62 	wait $tracee_pid 2> /dev/null
     63 	return 0
     64 }
     65 
     66 > "$LOG"
     67 $STRACE -p $tracee_pid 2> "$LOG" &
     68 
     69 while ! grep -F "Process $tracee_pid attached" "$LOG" > /dev/null; do
     70 	kill -0 $! 2> /dev/null || {
     71 		cleanup
     72 		dump_log_and_fail_with "$STRACE -p failed to attach"
     73 	}
     74 	$SLEEP_A_BIT
     75 done
     76 
     77 while ! grep -F -e '--- stopped by ' "$LOG" > /dev/null; do
     78 	kill -0 $! 2> /dev/null || {
     79 		cleanup
     80 		dump_log_and_fail_with "$STRACE -p missed stop notifications"
     81 	}
     82 	$SLEEP_A_BIT
     83 done
     84 
     85 kill -INT $!
     86 wait $!
     87 
     88 grep -F "Process $tracee_pid detached" "$LOG" > /dev/null || {
     89 	cleanup
     90 	dump_log_and_fail_with "$STRACE -p failed to detach"
     91 }
     92 
     93 if [ -f /proc/self/status ]; then
     94 	$SLEEP_A_BIT
     95 	test -d /proc/$tracee_pid || {
     96 		cleanup
     97 		dump_log_and_fail_with 'tracee died after detach'
     98 	}
     99 	grep_pid_status "$tracee_pid" '^State:.*T (stopped)' > /dev/null || {
    100 		grep_pid_status "$tracee_pid" '^State:'
    101 		cleanup
    102 		dump_log_and_fail_with 'tracee is not group-stopped after detach'
    103 	}
    104 fi
    105 
    106 cleanup
    107 exit 0
    108