testsuite: refactor spawn and wait for attach

Several places in the testsuite have a copy of a snippet of code that
spawns a test program, waits a bit, and then does some PID munging for
Cygwin.  This is in order to have GDB attach to the spawned program.

This refactors all that to a common procedure.

(multi-attach.exp wants to spawn multiple processes, so this makes the
new procedure's interface work with lists.)

Tested on x86_64 Fedora 20.

gdb/testsuite/ChangeLog:
2014-09-11  Pedro Alves  <palves@redhat.com>

	* lib/gdb.exp (spawn_wait_for_attach): New procedure.
	* gdb.base/attach.exp (do_attach_tests, do_call_attach_tests)
	(do_command_attach_tests): Use spawn_wait_for_attach.
	* gdb.base/solib-overlap.exp: Likewise.
	* gdb.multi/multi-attach.exp: Likewise.
	* gdb.python/py-prompt.exp: Likewise.
	* gdb.python/py-sync-interp.exp: Likewise.
	* gdb.server/ext-attach.exp: Likewise.

8 files changed, 48 insertions, 83 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index d2d44cc..f8be927 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,14 @@
+2014-09-11  Pedro Alves  <palves@redhat.com>
+
+	* lib/gdb.exp (spawn_wait_for_attach): New procedure.
+	* gdb.base/attach.exp (do_attach_tests, do_call_attach_tests)
+	(do_command_attach_tests): Use spawn_wait_for_attach.
+	* gdb.base/solib-overlap.exp: Likewise.
+	* gdb.multi/multi-attach.exp: Likewise.
+	* gdb.python/py-prompt.exp: Likewise.
+	* gdb.python/py-sync-interp.exp: Likewise.
+	* gdb.server/ext-attach.exp: Likewise.
+
 2014-09-11  Gabriel Krisman Bertazi  <gabriel@krisman.be>
 
 	* gdb.fortran/array-element.exp: Remove unexpected "continue"
diff --git a/gdb/testsuite/gdb.base/attach.exp b/gdb/testsuite/gdb.base/attach.exp
index 9714c29..a20c51a 100644
--- a/gdb/testsuite/gdb.base/attach.exp
+++ b/gdb/testsuite/gdb.base/attach.exp
@@ -70,13 +70,7 @@ proc do_attach_tests {} {
     # Start the program running and then wait for a bit, to be sure
     # that it can be attached to.
 
-    set testpid [eval exec $binfile &]
-    exec sleep 2
-    if { [istarget "*-*-cygwin*"] } {
-	# testpid is the Cygwin PID, GDB uses the Windows PID, which might be
-	# different due to the way fork/exec works.
-	set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
-    }
+    set testpid [spawn_wait_for_attach $binfile]
 
     # Verify that we cannot attach to nonsense.
 
@@ -279,16 +273,7 @@ proc do_attach_tests {} {
    
     remote_exec build "kill -9 ${testpid}"
 
-    # Start the program running and then wait for a bit, to be sure
-    # that it can be attached to.
-   
-    set testpid [eval exec $binfile &]
-    exec sleep 2
-    if { [istarget "*-*-cygwin*"] } {
-	# testpid is the Cygwin PID, GDB uses the Windows PID, which might be
-	# different due to the way fork/exec works.
-	set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
-    }
+    set testpid [spawn_wait_for_attach $binfile]
 
     # Verify that we can attach to the process, and find its a.out
     # when we're cd'd to some directory that doesn't contain the
@@ -335,16 +320,7 @@ proc do_call_attach_tests {} {
     global gdb_prompt
     global binfile2
     
-    # Start the program running and then wait for a bit, to be sure
-    # that it can be attached to.
-   
-    set testpid [eval exec $binfile2 &]
-    exec sleep 2
-    if { [istarget "*-*-cygwin*"] } {
-	# testpid is the Cygwin PID, GDB uses the Windows PID, which might be
-	# different due to the way fork/exec works.
-	set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
-    }
+    set testpid [spawn_wait_for_attach $binfile2]
 
     # Attach
    
@@ -397,16 +373,7 @@ proc do_command_attach_tests {} {
 	return 0
     }
 
-    # Start the program running and then wait for a bit, to be sure
-    # that it can be attached to.
-
-    set testpid [eval exec $binfile &]
-    exec sleep 2
-    if { [istarget "*-*-cygwin*"] } {
-	# testpid is the Cygwin PID, GDB uses the Windows PID, which might be
-	# different due to the way fork/exec works.
-	set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
-    }
+    set testpid [spawn_wait_for_attach $binfile]
 
     gdb_exit
     if $verbose>1 then {
diff --git a/gdb/testsuite/gdb.base/solib-overlap.exp b/gdb/testsuite/gdb.base/solib-overlap.exp
index 68731be..7486b07 100644
--- a/gdb/testsuite/gdb.base/solib-overlap.exp
+++ b/gdb/testsuite/gdb.base/solib-overlap.exp
@@ -82,16 +82,7 @@ foreach prelink_lib1 {0x40000000 0x50000000} { with_test_prefix "$prelink_lib1"
 	return -1
     }
 
-    # Start the program running and then wait for a bit, to be sure
-    # that it can be attached to.
-
-    set testpid [eval exec $binfile &]
-    sleep 2
-    if { [istarget "*-*-cygwin*"] } {
-	# testpid is the Cygwin PID, GDB uses the Windows PID, which might be
-	# different due to the way fork/exec works.
-	set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
-    }
+    set testpid [spawn_wait_for_attach $binfile]
 
     remote_exec build "mv -f ${binfile_lib1} ${binfile_lib1}-running"
     remote_exec build "mv -f ${binfile_lib2} ${binfile_lib2}-running"
diff --git a/gdb/testsuite/gdb.multi/multi-attach.exp b/gdb/testsuite/gdb.multi/multi-attach.exp
index e933520..eaff2c9 100644
--- a/gdb/testsuite/gdb.multi/multi-attach.exp
+++ b/gdb/testsuite/gdb.multi/multi-attach.exp
@@ -30,15 +30,10 @@ if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug additiona
 
 # Start the programs running and then wait for a bit, to be sure that
 # they can be attached to.
-set testpid1 [eval exec $binfile &]
-set testpid2 [eval exec $binfile &]
-exec sleep 2
-if { [istarget "*-*-cygwin*"] } {
-    # testpid{1,2} are the Cygwin PID, GDB uses the Windows PID, which might be
-    # different due to the way fork/exec works.
-    set testpid1 [ exec ps -e | gawk "{ if (\$1 == $testpid1) print \$4; }" ]
-    set testpid2 [ exec ps -e | gawk "{ if (\$1 == $testpid2) print \$4; }" ]
-}
+
+set pid_list [spawn_wait_for_attach [list $binfile $binfile]]
+set testpid1 [lindex $pid_list 0]
+set testpid2 [lindex $pid_list 1]
 
 gdb_test "attach $testpid1" \
     "Attaching to program: .*, process $testpid1.*(in|at).*" \
diff --git a/gdb/testsuite/gdb.python/py-prompt.exp b/gdb/testsuite/gdb.python/py-prompt.exp
index ebe4cb6..1c53c03 100644
--- a/gdb/testsuite/gdb.python/py-prompt.exp
+++ b/gdb/testsuite/gdb.python/py-prompt.exp
@@ -80,15 +80,7 @@ gdb_test "python print (\"'\" + str(p\[0\]) + \"'\")" "'$gdb_prompt_fail '" \
 	 "prompt_hook argument is default prompt. 2"
 gdb_exit
 
-# Start the program running and then wait for a bit, to be sure
-# that it can be attached to.
-set testpid [eval exec $binfile &]
-exec sleep 2
-if { [istarget "*-*-cygwin*"] } {
-    # testpid is the Cygwin PID, GDB uses the Windows PID, which might be
-    # different due to the way fork/exec works.
-    set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
-}
+set testpid [spawn_wait_for_attach $binfile]
 
 set GDBFLAGS [concat $tmp_gdbflags " -ex \"set pagination off\""]
 set GDBFLAGS [concat $GDBFLAGS " -ex \"set editing on\""]
diff --git a/gdb/testsuite/gdb.python/py-sync-interp.exp b/gdb/testsuite/gdb.python/py-sync-interp.exp
index b9b86bc..d62f966 100644
--- a/gdb/testsuite/gdb.python/py-sync-interp.exp
+++ b/gdb/testsuite/gdb.python/py-sync-interp.exp
@@ -41,15 +41,7 @@ if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
     return -1
 }
 
-# Start the program running and then wait for a bit, to be sure
-# that it can be attached to.
-set testpid [eval exec $binfile &]
-exec sleep 2
-if { [istarget "*-*-cygwin*"] } {
-    # testpid is the Cygwin PID, GDB uses the Windows PID, which might be
-    # different due to the way fork/exec works.
-    set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
-}
+set testpid [spawn_wait_for_attach $binfile]
 
 # Test command 'where' is executed when command 'attach' is done, otherwise
 # function 'sleep' may not show up in backtrace.
diff --git a/gdb/testsuite/gdb.server/ext-attach.exp b/gdb/testsuite/gdb.server/ext-attach.exp
index 5f7bac4..9baeeb7 100644
--- a/gdb/testsuite/gdb.server/ext-attach.exp
+++ b/gdb/testsuite/gdb.server/ext-attach.exp
@@ -44,15 +44,7 @@ gdbserver_start_extended
 
 gdb_test_no_output "set remote exec-file $target_exec" "set remote exec-file"
 
-# Start the program running and then wait for a bit, to be sure
-# that it can be attached to.
-set testpid [eval exec $binfile &]
-exec sleep 2
-if { [istarget "*-*-cygwin*"] } {
-    # testpid is the Cygwin PID, GDB uses the Windows PID, which might be
-    # different due to the way fork/exec works.
-    set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
-}
+set testpid [spawn_wait_for_attach $binfile]
 
 gdb_test "attach $testpid" \
     "Attaching to program: .*, process $testpid.*(in|at).*" \
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 82242f4..274cad2 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -3324,6 +3324,31 @@ proc gdb_exit { } {
     catch default_gdb_exit
 }
 
+# Start a set of programs running and then wait for a bit, to be sure
+# that they can be attached to.  Return a list of the processes' PIDs.
+
+proc spawn_wait_for_attach { executable_list } {
+    set pid_list {}
+
+    foreach {executable} $executable_list {
+	lappend pid_list [eval exec $executable &]
+    }
+
+    sleep 2
+
+    if { [istarget "*-*-cygwin*"] } {
+	for {set i 0} {$i < [llength $pid_list]} {incr i} {
+	    # testpid is the Cygwin PID, GDB uses the Windows PID,
+	    # which might be different due to the way fork/exec works.
+	    set testpid [lindex $pid_list $i]
+	    set testpid [ exec ps -e | gawk "{ if (\$1 == $testpid) print \$4; }" ]
+	    set pid_list [lreplace $pid_list $i $i $testpid]
+	}
+    }
+
+    return $pid_list
+}
+
 #
 # gdb_load_cmd -- load a file into the debugger.
 #		  ARGS - additional args to load command.