89 lines
2.6 KiB
Diff
89 lines
2.6 KiB
Diff
http://sourceware.org/ml/gdb-cvs/2012-02/msg00180.html
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### src/gdb/gdbserver/ChangeLog 2012/02/25 19:54:50 1.556
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### src/gdb/gdbserver/ChangeLog 2012/02/27 16:19:19 1.557
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## -1,3 +1,9 @@
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+2012-02-27 Pedro Alves <palves@redhat.com>
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+
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+ PR server/9684
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+ * linux-low.c (pid_is_stopped): New.
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+ (linux_attach_lwp_1): Handle attaching to 'T (stopped)' processes.
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+
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2012-02-25 Luis Machado <lgustavo@codesourcery.com>
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* mem-break.c (clear_gdb_breakpoint_conditions): Fix de-allocation
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--- src/gdb/gdbserver/linux-low.c 2012/02/24 15:15:56 1.193
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+++ src/gdb/gdbserver/linux-low.c 2012/02/27 16:19:19 1.194
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@@ -598,6 +598,37 @@
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return pid;
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}
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+/* Detect `T (stopped)' in `/proc/PID/status'.
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+ Other states including `T (tracing stop)' are reported as false. */
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+
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+static int
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+pid_is_stopped (pid_t pid)
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+{
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+ FILE *status_file;
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+ char buf[100];
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+ int retval = 0;
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+
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+ snprintf (buf, sizeof (buf), "/proc/%d/status", (int) pid);
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+ status_file = fopen (buf, "r");
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+ if (status_file != NULL)
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+ {
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+ int have_state = 0;
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+
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+ while (fgets (buf, sizeof (buf), status_file))
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+ {
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+ if (strncmp (buf, "State:", 6) == 0)
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+ {
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+ have_state = 1;
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+ break;
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+ }
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+ }
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+ if (have_state && strstr (buf, "T (stopped)") != NULL)
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+ retval = 1;
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+ fclose (status_file);
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+ }
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+ return retval;
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+}
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+
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/* Attach to an inferior process. */
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static void
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@@ -643,6 +674,33 @@
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ptrace call on this LWP. */
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new_lwp->must_set_ptrace_flags = 1;
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+ if (pid_is_stopped (lwpid))
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+ {
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+ if (debug_threads)
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+ fprintf (stderr,
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+ "Attached to a stopped process\n");
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+
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+ /* The process is definitely stopped. It is in a job control
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+ stop, unless the kernel predates the TASK_STOPPED /
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+ TASK_TRACED distinction, in which case it might be in a
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+ ptrace stop. Make sure it is in a ptrace stop; from there we
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+ can kill it, signal it, et cetera.
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+
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+ First make sure there is a pending SIGSTOP. Since we are
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+ already attached, the process can not transition from stopped
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+ to running without a PTRACE_CONT; so we know this signal will
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+ go into the queue. The SIGSTOP generated by PTRACE_ATTACH is
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+ probably already in the queue (unless this kernel is old
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+ enough to use TASK_STOPPED for ptrace stops); but since
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+ SIGSTOP is not an RT signal, it can only be queued once. */
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+ kill_lwp (lwpid, SIGSTOP);
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+
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+ /* Finally, resume the stopped process. This will deliver the
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+ SIGSTOP (or a higher priority signal, just like normal
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+ PTRACE_ATTACH), which we'll catch later on. */
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+ ptrace (PTRACE_CONT, lwpid, 0, 0);
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+ }
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+
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/* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
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brings it to a halt.
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