projects / packages / gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| f412e1b4 PS |
1 | http://sourceware.org/ml/gdb-cvs/2012-02/msg00180.html |
| 2 | ||
| 3 | ### src/gdb/gdbserver/ChangeLog 2012/02/25 19:54:50 1.556 | |
| 4 | ### src/gdb/gdbserver/ChangeLog 2012/02/27 16:19:19 1.557 | |
| 5 | ## -1,3 +1,9 @@ | |
| 6 | +2012-02-27 Pedro Alves <palves@redhat.com> | |
| 7 | + | |
| 8 | + PR server/9684 | |
| 9 | + * linux-low.c (pid_is_stopped): New. | |
| 10 | + (linux_attach_lwp_1): Handle attaching to 'T (stopped)' processes. | |
| 11 | + | |
| 12 | 2012-02-25 Luis Machado <lgustavo@codesourcery.com> | |
| 13 | ||
| 14 | * mem-break.c (clear_gdb_breakpoint_conditions): Fix de-allocation | |
| 15 | --- src/gdb/gdbserver/linux-low.c 2012/02/24 15:15:56 1.193 | |
| 16 | +++ src/gdb/gdbserver/linux-low.c 2012/02/27 16:19:19 1.194 | |
| 17 | @@ -598,6 +598,37 @@ | |
| 18 | return pid; | |
| 19 | } | |
| 20 | ||
| 21 | +/* Detect `T (stopped)' in `/proc/PID/status'. | |
| 22 | + Other states including `T (tracing stop)' are reported as false. */ | |
| 23 | + | |
| 24 | +static int | |
| 25 | +pid_is_stopped (pid_t pid) | |
| 26 | +{ | |
| 27 | + FILE *status_file; | |
| 28 | + char buf[100]; | |
| 29 | + int retval = 0; | |
| 30 | + | |
| 31 | + snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid); | |
| 32 | + status_file = fopen (buf, "r"); | |
| 33 | + if (status_file != NULL) | |
| 34 | + { | |
| 35 | + int have_state = 0; | |
| 36 | + | |
| 37 | + while (fgets (buf, sizeof (buf), status_file)) | |
| 38 | + { | |
| 39 | + if (strncmp (buf, "State:", 6) == 0) | |
| 40 | + { | |
| 41 | + have_state = 1; | |
| 42 | + break; | |
| 43 | + } | |
| 44 | + } | |
| 45 | + if (have_state && strstr (buf, "T (stopped)") != NULL) | |
| 46 | + retval = 1; | |
| 47 | + fclose (status_file); | |
| 48 | + } | |
| 49 | + return retval; | |
| 50 | +} | |
| 51 | + | |
| 52 | /* Attach to an inferior process. */ | |
| 53 | ||
| 54 | static void | |
| 55 | @@ -643,6 +674,33 @@ | |
| 56 | ptrace call on this LWP. */ | |
| 57 | new_lwp->must_set_ptrace_flags = 1; | |
| 58 | ||
| 59 | + if (pid_is_stopped (lwpid)) | |
| 60 | + { | |
| 61 | + if (debug_threads) | |
| 62 | + fprintf (stderr, | |
| 63 | + "Attached to a stopped process\n"); | |
| 64 | + | |
| 65 | + /* The process is definitely stopped. It is in a job control | |
| 66 | + stop, unless the kernel predates the TASK_STOPPED / | |
| 67 | + TASK_TRACED distinction, in which case it might be in a | |
| 68 | + ptrace stop. Make sure it is in a ptrace stop; from there we | |
| 69 | + can kill it, signal it, et cetera. | |
| 70 | + | |
| 71 | + First make sure there is a pending SIGSTOP. Since we are | |
| 72 | + already attached, the process can not transition from stopped | |
| 73 | + to running without a PTRACE_CONT; so we know this signal will | |
| 74 | + go into the queue. The SIGSTOP generated by PTRACE_ATTACH is | |
| 75 | + probably already in the queue (unless this kernel is old | |
| 76 | + enough to use TASK_STOPPED for ptrace stops); but since | |
| 77 | + SIGSTOP is not an RT signal, it can only be queued once. */ | |
| 78 | + kill_lwp (lwpid, SIGSTOP); | |
| 79 | + | |
| 80 | + /* Finally, resume the stopped process. This will deliver the | |
| 81 | + SIGSTOP (or a higher priority signal, just like normal | |
| 82 | + PTRACE_ATTACH), which we'll catch later on. */ | |
| 83 | + ptrace (PTRACE_CONT, lwpid, 0, 0); | |
| 84 | + } | |
| 85 | + | |
| 86 | /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH | |
| 87 | brings it to a halt. | |
| 88 |