[Bug breakpoints/15184] New: Cannot change dprintf style to agent for existing dprintfs

["marc.khouzam at ericsson dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15184

             Bug #: 15184
           Summary: Cannot change dprintf style to agent for existing
                    dprintfs
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
        AssignedTo: unassigned@sourceware.org
        ReportedBy: marc.khouzam@ericsson.com
    Classification: Unclassified


Updating the dprintf-style to 'agent' for existing dprintfs will cause: "May
only run agent-printf on the target" when it is time to print and it will
interrupt the inferior.

Here's a session showing the problem:

> gdb.7.6 ~/loopfirst
GNU gdb (GDB) 7.5.50.20130223-cvs
(gdb) l
1       #include <unistd.h>
2       #include <stdio.h>
3
4       int main() {
5           for (int i=0;i<20;i++) {
6               printf("hello");
7               printf("friend\n");
8               printf("home\n");
9               sleep(1);
10          }
(gdb) target remote :9999
Remote debugging using :9999
Reading symbols from /lib/ld-linux.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux.so.2
0x00110850 in ?? () from /lib/ld-linux.so.2
(gdb) dprintf 8,"welcome\n"
Dprintf 1 at 0x804855f: file loopfirst.cc, line 8.
(gdb) b 9
Breakpoint 2 at 0x804856b: file loopfirst.cc, line 9.
(gdb) info b
Num     Type           Disp Enb Address    What
1       dprintf        keep y   0x0804855f in main() at loopfirst.cc:8
        printf "welcome\n"
        continue
2       breakpoint     keep y   0x0804856b in main() at loopfirst.cc:9
(gdb) c
Continuing.
welcome

Breakpoint 2, main () at loopfirst.cc:9
9               sleep(1);
(gdb) set dprintf-style agent
(gdb) info b
Num     Type           Disp Enb Address    What
1       dprintf        keep y   0x0804855f in main() at loopfirst.cc:8
        breakpoint already hit 1 time
        agent-printf "welcome\n"
2       breakpoint     keep y   0x0804856b in main() at loopfirst.cc:9
        breakpoint already hit 1 time
(gdb) c
Continuing.
May only run agent-printf on the target
(gdb) bt
#0  main () at loopfirst.cc:8

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