fix for PR gdb/15995

This patch fixes PR gdb/15995.

The bug here is that gdb's printf command does not flush the output
stream.  This makes a printf that is not newline-terminated interleave
incorrectly with other forms of output, such as that generated via a
call to an external program using "shell".

I note that the "output" command already does this flushing.

The fix is to call gdb_flush in printf_command.

Built and regtested on x86-64 Fedora 18.
New test case included.

	PR gdb/15995:
	* printcmd.c (printcmd): Call gdb_flush.

	* gdb.base/printcmds.exp (test_printf): Test printf flushing.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index adf5dcc..d6200fa 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2013-10-17  Tom Tromey  <tromey@redhat.com>
 
+       PR gdb/15995:
+       * printcmd.c (printcmd): Call gdb_flush.
+
+2013-10-17  Tom Tromey  <tromey@redhat.com>
+
        * elfread.c (struct elfinfo) <stabindexsect>: Remove.
        (elf_locate_sections): Update.
 

diff --git a/gdb/printcmd.c b/gdb/printcmd.c
index 751cd2b..9bca6dd 100644 (file)
--- a/gdb/printcmd.c
+++ b/gdb/printcmd.c
@@ -2458,6 +2458,7 @@ static void
 printf_command (char *arg, int from_tty)
 {
   ui_printf (arg, gdb_stdout);
+  gdb_flush (gdb_stdout);
 }
 
 /* Implement the "eval" command.  */

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 886338e..634184a 100644 (file)
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2013-10-17  Tom Tromey  <tromey@redhat.com>
+
+       * gdb.base/printcmds.exp (test_printf): Test printf flushing.
+
 2013-10-14  Tom Tromey  <tromey@redhat.com>
 
        * gdb.dwarf2/dwzbuildid.exp (write_dwarf_file): Pass explicit test

diff --git a/gdb/testsuite/gdb.base/printcmds.exp b/gdb/testsuite/gdb.base/printcmds.exp
index 60e4a7f..6d65107 100644 (file)
--- a/gdb/testsuite/gdb.base/printcmds.exp
+++ b/gdb/testsuite/gdb.base/printcmds.exp
@@ -740,6 +740,12 @@ proc test_printf {} {
     gdb_test "printf \"% p\", 0" "Inappropriate modifiers to format specifier 'p' in printf"
     gdb_test "printf \"%0p\", 0" "Inappropriate modifiers to format specifier 'p' in printf"
     gdb_test "printf \"%+p\", 0" "Inappropriate modifiers to format specifier 'p' in printf"
+
+
+    gdb_test "define hibob\nprintf \"hi bob \"\nshell echo zzz\nprintf \"y\\n\"\nend" \
+       "" \
+       "create hibob command"
+    gdb_test "hibob" "hi bob zzz.*y" "run hibob command"
 }
 
 #Test printing DFP values with printf