[3/3] Add support for catching exec events on FreeBSD.
Commit Message
FreeBSD kernels that support fork tracing always stop a process to
report events for exec. Such a process will have the PL_FLAG_EXEC
flag set in the pl_flags field of the ptrace_lwpinfo struct returned
by PT_LWPINFO. The structure does not include the pathname passed to
exec, so use fbsd_pid_to_exec_file to query the pathname of the
process' executable.
gdb/ChangeLog:
* fbsd-nat.c: (fbsd_wait) [PL_FLAG_EXEC]: Report TARGET_WAITKIND_EXECD
event if PL_FLAG_EXEC is set.
[PL_FLAG_EXEC] (fbsd_insert_exec_catchpoint): New function.
[PL_FLAG_EXEC] (fbsd_remove_exec_catchpoint): New function.
(fbsd_nat_add_target) [PL_FLAG_EXEC]: Set
"to_insert_exec_catchpoint" to "fbsd_insert_exec_catchpoint".
Set "to_remove_exec_catchpoint" to "fbsd_remove_exec_catchpoint".
---
@@ -376,6 +376,16 @@ fbsd_wait (struct target_ops *ops,
continue;
}
#endif
+
+#ifdef PL_FLAG_EXEC
+ if (pl.pl_flags & PL_FLAG_EXEC)
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXECD;
+ ourstatus->value.execd_pathname
+ = xstrdup (fbsd_pid_to_exec_file (NULL, pid));
+ return wptid;
+ }
+#endif
}
return wptid;
}
@@ -458,6 +468,23 @@ fbsd_post_attach (struct target_ops *self, int pid)
fbsd_enable_follow_fork (pid);
}
#endif
+
+#ifdef PL_FLAG_EXEC
+/* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes
+ will always stop after exec. */
+
+static int
+fbsd_insert_exec_catchpoint (struct target_ops *self, int pid)
+{
+ return 0;
+}
+
+static int
+fbsd_remove_exec_catchpoint (struct target_ops *self, int pid)
+{
+ return 0;
+}
+#endif
#endif
void
@@ -477,6 +504,10 @@ fbsd_nat_add_target (struct target_ops *t)
t->to_post_startup_inferior = fbsd_post_startup_inferior;
t->to_post_attach = fbsd_post_attach;
#endif
+#ifdef PL_FLAG_EXEC
+ t->to_insert_exec_catchpoint = fbsd_insert_exec_catchpoint;
+ t->to_remove_exec_catchpoint = fbsd_remove_exec_catchpoint;
+#endif
#endif
add_target (t);
}