# Copyright 2005, 2006, 2007, 2008, 2009 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 . if $tracelevel then { strace $tracelevel } if { [is_remote target] || ![isnative] } then { continue } # Until "set follow-fork-mode" and "catch fork" are implemented on # other targets... # if {![istarget "hppa*-hp-hpux*"] && ![istarget "*-*-linux*"]} then { continue } set prms_id 0 set bug_id 0 set testfile "multi-forks" set srcfile ${testfile}.c set binfile ${objdir}/${subdir}/${testfile} if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } { untested multi-forks.exp return -1 } # Start with a fresh gdb gdb_exit gdb_start gdb_reinitialize_dir $srcdir/$subdir gdb_load ${binfile} global gdb_prompt # This is a test of gdb's ability to follow the parent, child or both # parent and child of multiple Unix fork() system calls. set exit_bp_loc [gdb_get_line_number "Set exit breakpoint here."] # Insert a breakpoint at the location provided by the exit_bp_loc global # and resume the execution until hitting that breakpoint. We also make # sure to consume all the expected output from all processes as well, # to make sure it doesn't cause trouble during a subsequent test. proc continue_to_exit_bp_loc {} { global exit_bp_loc decimal gdb_prompt gdb_breakpoint $exit_bp_loc send_gdb "continue\n" # The output from the child processes can be interleaved arbitrarily # with the output from GDB and the parent process. If we don't # consume it all now, it can confuse later interactions. set seen_done 0 set seen_break 0 set seen_prompt 0 set seen_timeout 0 while { ($seen_done < 16 || ! $seen_prompt) && ! $seen_timeout } { # We don't know what order the interesting things will arrive in. # Using a pattern of the form 'x|y|z' instead of -re x ... -re y # ... -re z ensures that expect always chooses the match that # occurs leftmost in the input, and not the pattern appearing # first in the script that occurs anywhere in the input, so that # we don't skip anything. gdb_expect { -re "($decimal done)|(Breakpoint)|($gdb_prompt)" { if {[info exists expect_out(1,string)]} { incr seen_done } elseif {[info exists expect_out(2,string)]} { set seen_break 1 } elseif {[info exists expect_out(3,string)]} { set seen_prompt 1 } array unset expect_out } timeout { set seen_timeout 1 } } } if { $seen_timeout } { fail "run to exit 2 (timeout)" } elseif { ! $seen_prompt } { fail "run to exit 2 (no prompt)" } elseif { ! $seen_break } { fail "run to exit 2 (no breakpoint hit)" } elseif { $seen_done != 16 } { fail "run to exit 2 (missing done messages)" } else { pass "run to exit 2" } } # The inferior program builds a tree of processes by executing a loop # four times, calling fork at each iteration. Thus, at each # iteration, the total number of processes doubles; after four # iterations, we have 16 processes. Each process saves the results # from its 'fork' calls, so we can tell which leaf a given process is # by looking at which forks returned zero and which returned a pid: a # zero means to take the child's branch; a pid means to take the # parent's branch. # First set gdb to follow the child. # The result should be that each of the 4 forks returns zero. runto_main gdb_test "set follow child" continue_to_exit_bp_loc gdb_test "print pids" "\\$.* = \\{0, 0, 0, 0\\}.*" "follow child, print pids" # Now set gdb to follow the parent. # Result should be that none of the 4 forks returns zero. runto_main gdb_test "set follow parent" "" "" continue_to_exit_bp_loc gdb_test "print pids\[0\]==0 || pids\[1\]==0 || pids\[2\]==0 || pids\[3\]==0" \ " = 0" "follow parent, print pids" # # Now test with detach-on-fork off. # # detach-on-fork isn't implemented on hpux. # if {![istarget "*-*-linux*"]} then { continue } # Start with a fresh gdb gdb_exit gdb_start gdb_reinitialize_dir $srcdir/$subdir gdb_load ${binfile} runto_main gdb_breakpoint $exit_bp_loc gdb_test "help set detach-on-fork" "whether gdb will detach the child.*" \ "help set detach" gdb_test "show detach-on-fork" "on." "show detach default on" gdb_test "set detach off" "" "set detach off" # # We will now run every fork up to the exit bp, # eventually winding up with 16 inferiors. # for {set i 1} {$i <= 15} {incr i} { gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit $i" gdb_test "info inferior" " 5 .* 4 .* 3 .* 2 .*" "info inferior $i" gdb_test "inferior $i + 1" "(_dl_sysinfo_int80|fork|__kernel_(v|)syscall).*" \ "inferior $i" } gdb_test "continue" "Breakpoint .* main .*exit.*" "Run to exit 16" gdb_test "info inferiors" " 5 .* 4 .* 3 .* 2 .*" "info inferior 16" gdb_test "inferior 2" " main .*" "restart final" # # Now we should examine all the pids. # # # Test detach inferior # # [assumes we're at #1] gdb_test "detach inferior 2" "Detaching .*" "Detach 2" gdb_test "detach inferior 3" "Detaching .*" "Detach 3" gdb_test "detach inferior 4" "Detaching .*" "Detach 4" gdb_test "detach inferior 5" "Detaching .*" "Detach 5" # # Test kill inferior # gdb_test "kill inferior 6" "" "Kill 6" gdb_test "info inferior 6" "Inferior ID 6 not known." "Did kill 6" gdb_test "kill inferior 7" "" "Kill 7" gdb_test "info inferior 7" "Inferior ID 7 not known." "Did kill 7" gdb_test "kill inferior 8" "" "Kill 8" gdb_test "info inferior 8" "Inferior ID 8 not known." "Did kill 8" gdb_test "kill inferior 9" "" "Kill 9" gdb_test "info inferior 9" "Inferior ID 9 not known." "Did kill 9" gdb_test "kill inferior 10" "" "Kill 10" gdb_test "info inferior 10" "Inferior ID 10 not known." "Did kill 10" gdb_test "kill inferior 11" "" "Kill 11" gdb_test "info inferior 11" "Inferior ID 11 not known." "Did kill 11" gdb_test "kill inferior 12" "" "Kill 12" gdb_test "info inferior 12" "Inferior ID 12 not known." "Did kill 12" gdb_test "kill inferior 13" "" "Kill 13" gdb_test "info inferior 13" "Inferior ID 13 not known." "Did kill 13" gdb_test "kill inferior 14" "" "Kill 14" gdb_test "info inferior 14" "Inferior ID 14 not known." "Did kill 14" gdb_test "kill inferior 15" "" "Kill 15" gdb_test "info inferior 15" "Inferior ID 15 not known." "Did kill 15" gdb_test "kill inferior 16" "" "Kill 16" gdb_test "info inferior 16" "Inferior ID 16 not known." "Did kill 16" return 0