# Copyright 2008-2012 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 <http://www.gnu.org/licenses/>.

# This test was created by modifying attach-stopped.exp.
# This file was created by Jan Kratochvil <jan.kratochvil@redhat.com>.

# This test only works on Linux
if { ![isnative] || [is_remote host] || [target_info exists use_gdb_stub]
     || ![istarget *-linux*] } {
    continue
}

set testfile "attach-into-signal"
set srcfile  ${testfile}.c
set executable_nothr ${testfile}-nothr
set executable_thr ${testfile}-thr

remote_exec build "rm -f ${objdir}/${subdir}/${executable_nothr}"
remote_exec build "rm -f ${objdir}/${subdir}/${executable_thr}"
# For debugging this test
#
#log_user 1

proc corefunc { threadtype executable } {
    global srcfile
    global srcdir
    global objdir
    global subdir
    global gdb_prompt
    global pf_prefix

    set save_pf_prefix $pf_prefix
    lappend pf_prefix "$threadtype:"

    clean_restart ${executable}

    set binfile ${objdir}/${subdir}/${executable}
    set escapedbinfile [string_to_regexp ${objdir}/${subdir}/${executable}]

    if [get_compiler_info ${binfile}] {
	set pf_prefix $save_pf_prefix
	return -1
    }

    gdb_test "handle SIGALRM stop print pass" "Yes.*Yes.*Yes.*"

    # Start the program running and then wait for a bit, to be sure
    # that it can be attached to.
    # Statistically there is a better chance without giving process a nice.

    set testpid [eval exec $binfile &]
    exec sleep 2

    # Run 2 passes of the test.
    # The C file inferior stops pending its signals if a single one is lost,
    # we test successful redelivery of the caught signal by the 2nd pass.

    # linux-2.6.20.4.x86_64 had maximal attempt # 20 in 4 test runs.
    set attempts 100
    set attempt 1
    set passes 1
    while { $passes < 3 && $attempt <= $attempts } {
	set stoppedtry 0
	while { $stoppedtry < 10 } {
	    if [catch {open /proc/${testpid}/status r} fileid] {
		set stoppedtry 10
		break
	    }
	    gets $fileid line1;
	    gets $fileid line2;
	    close $fileid;

	    if {![string match "*(stopped)*" $line2]} {
		# No PASS message as we may be looping in multiple attempts.
		break
	    }
	    sleep 1
	    set stoppedtry [expr $stoppedtry + 1]
	}
	if { $stoppedtry >= 10 } {
	    verbose -log $line2
	    set test "process is still running on the attempt # $attempt of $attempts"
	    break
	}

	# Main test:
	set test "attach (pass $passes), pending signal catch"
	if {[gdb_test_multiple "attach $testpid" $test {
	    -re "Attaching to program.*`?$escapedbinfile'?, process $testpid.*Program received signal SIGALRM.*$gdb_prompt $" {
		# nonthreaded:
		pass $test
		verbose -log "$test succeeded on the attempt # $attempt of $attempts"
		set passes [expr $passes + 1]
	    }
	    -re "Attaching to program.*`?$escapedbinfile'?, process $testpid.*$gdb_prompt $" {
		set ok 0

		if { $threadtype == "threaded" } {
		    # In the threaded case, the signal is left pending
		    # on the second thread.  Check for that by peeking
		    # at the thread's siginfo.  SIGALRM is 14, SIGSTOP
		    # is 19.

		    # With remote targets, we need to pull the thread
		    # list explicitly before GDB even knows about
		    # thread 2.
		    set test2 "pull thread list"
		    gdb_test_multiple "info threads" $test2 {
			-re "\r\n$gdb_prompt $" {
			}
		    }

		    set test2 "thread apply 2 print \$_siginfo.si_signo"
		    gdb_test_multiple $test2 $test2 {
			-re " = 14\r\n$gdb_prompt $" {
			    set ok 1
			}
			-re " = 19\r\n$gdb_prompt $" {
			}
		    }
		} else {
		    # In the nonthreaded case, GDB should tell the
		    # user about having seen a signal.
		}

		if { $ok == 0} {
		    # We just lack the luck, we should try it again.
		    set attempt [expr $attempt + 1]
		} else {
		    pass $test
		    verbose -log "$test succeeded on the attempt # $attempt of $attempts"
		    set passes [expr $passes + 1]
		}
	    }
	}] != 0 } {
	    break
	}

	gdb_test "detach" "Detaching from.*" ""
    }
    if {$passes < 3} {
	if {$attempt > $attempts} {
	    unresolved $test
	} else {
	    fail $test
	}
    }

    # Exit and detach the process.
       
    gdb_exit

    # Make sure we don't leave a process around to confuse
    # the next test run (and prevent the compile by keeping
    # the text file busy), in case the "set should_exit" didn't
    # work.

    # Continue the program - some Linux kernels need it before -9 if the
    # process is stopped.
    remote_exec build "kill -s CONT ${testpid}"
       
    remote_exec build "kill -9 ${testpid}"

    set pf_prefix $save_pf_prefix
}

# build the test case first without threads
#
if {[build_executable $testfile $executable_nothr $srcfile] == -1} {
    untested "attach-into-signal.exp (nonthreaded)"
    return -1
}

corefunc nonthreaded ${executable_nothr}

# build the test case also with threads
#
if  { [gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${objdir}/${subdir}/${executable_thr}" executable {debug additional_flags=-DUSE_THREADS}] != "" } {
    untested "attach-into-signal.exp (threaded)"
    return -1
}

corefunc threaded ${executable_thr}