diff options
Diffstat (limited to 'gdb/remote.c')
| -rw-r--r-- | gdb/remote.c | 130 |
1 files changed, 105 insertions, 25 deletions
diff --git a/gdb/remote.c b/gdb/remote.c index 6dae920..390d30d 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -1462,6 +1462,14 @@ remote_multi_process_p (struct remote_state *rs) return packet_support (PACKET_multiprocess_feature) == PACKET_ENABLE; } +/* Returns true if fork events are supported. */ + +static int +remote_fork_event_p (struct remote_state *rs) +{ + return packet_support (PACKET_fork_event_feature) == PACKET_ENABLE; +} + /* Tokens for use by the asynchronous signal handlers for SIGINT. */ static struct async_signal_handler *async_sigint_remote_twice_token; static struct async_signal_handler *async_sigint_remote_token; @@ -4430,16 +4438,42 @@ remote_open_1 (const char *name, int from_tty, wait_forever_enabled_p = 1; } -/* This takes a program previously attached to and detaches it. After - this is done, GDB can be used to debug some other program. We - better not have left any breakpoints in the target program or it'll - die when it hits one. */ +/* Detach the specified process. */ + +static void +remote_detach_pid (int pid) +{ + struct remote_state *rs = get_remote_state (); + + if (remote_multi_process_p (rs)) + xsnprintf (rs->buf, get_remote_packet_size (), "D;%x", pid); + else + strcpy (rs->buf, "D"); + + putpkt (rs->buf); + getpkt (&rs->buf, &rs->buf_size, 0); + + if (rs->buf[0] == 'O' && rs->buf[1] == 'K') + ; + else if (rs->buf[0] == '\0') + error (_("Remote doesn't know how to detach")); + else + error (_("Can't detach process.")); +} + +/* This detaches a program to which we previously attached, using + inferior_ptid to identify the process. After this is done, GDB + can be used to debug some other program. We better not have left + any breakpoints in the target program or it'll die when it hits + one. */ static void -remote_detach_1 (const char *args, int from_tty, int extended) +remote_detach_1 (const char *args, int from_tty) { int pid = ptid_get_pid (inferior_ptid); struct remote_state *rs = get_remote_state (); + struct thread_info *tp = find_thread_ptid (inferior_ptid); + int is_fork_parent; if (args) error (_("Argument given to \"detach\" when remotely debugging.")); @@ -4458,37 +4492,74 @@ remote_detach_1 (const char *args, int from_tty, int extended) } /* Tell the remote target to detach. */ - if (remote_multi_process_p (rs)) - xsnprintf (rs->buf, get_remote_packet_size (), "D;%x", pid); - else - strcpy (rs->buf, "D"); + remote_detach_pid (pid); - putpkt (rs->buf); - getpkt (&rs->buf, &rs->buf_size, 0); - - if (rs->buf[0] == 'O' && rs->buf[1] == 'K') - ; - else if (rs->buf[0] == '\0') - error (_("Remote doesn't know how to detach")); - else - error (_("Can't detach process.")); - - if (from_tty && !extended) + if (from_tty && !rs->extended) puts_filtered (_("Ending remote debugging.\n")); - target_mourn_inferior (); + /* Check to see if we are detaching a fork parent. Note that if we + are detaching a fork child, tp == NULL. */ + is_fork_parent = (tp != NULL + && tp->pending_follow.kind == TARGET_WAITKIND_FORKED); + + /* If doing detach-on-fork, we don't mourn, because that will delete + breakpoints that should be available for the followed inferior. */ + if (!is_fork_parent) + target_mourn_inferior (); + else + { + inferior_ptid = null_ptid; + detach_inferior (pid); + } } static void remote_detach (struct target_ops *ops, const char *args, int from_tty) { - remote_detach_1 (args, from_tty, 0); + remote_detach_1 (args, from_tty); } static void extended_remote_detach (struct target_ops *ops, const char *args, int from_tty) { - remote_detach_1 (args, from_tty, 1); + remote_detach_1 (args, from_tty); +} + +/* Target follow-fork function for remote targets. On entry, and + at return, the current inferior is the fork parent. + + Note that although this is currently only used for extended-remote, + it is named remote_follow_fork in anticipation of using it for the + remote target as well. */ + +static int +remote_follow_fork (struct target_ops *ops, int follow_child, + int detach_fork) +{ + struct remote_state *rs = get_remote_state (); + + if (remote_fork_event_p (rs)) + { + /* When following the parent and detaching the child, we detach + the child here. For the case of following the child and + detaching the parent, the detach is done in the target- + independent follow fork code in infrun.c. We can't use + target_detach when detaching an unfollowed child because + the client side doesn't know anything about the child. */ + if (detach_fork && !follow_child) + { + /* Detach the fork child. */ + ptid_t child_ptid; + pid_t child_pid; + + child_ptid = inferior_thread ()->pending_follow.value.related_pid; + child_pid = ptid_get_pid (child_ptid); + + remote_detach_pid (child_pid); + detach_inferior (child_pid); + } + } + return 0; } /* Same as remote_detach, but don't send the "D" packet; just disconnect. */ @@ -5651,6 +5722,11 @@ Packet: '%s'\n"), p = unpack_varlen_hex (++p1, &c); event->core = c; } + else if (strncmp (p, "fork", p1 - p) == 0) + { + event->ws.value.related_pid = read_ptid (++p1, &p); + event->ws.kind = TARGET_WAITKIND_FORKED; + } else { ULONGEST pnum; @@ -9505,8 +9581,11 @@ remote_pid_to_str (struct target_ops *ops, ptid_t ptid) if (ptid_equal (magic_null_ptid, ptid)) xsnprintf (buf, sizeof buf, "Thread <main>"); else if (rs->extended && remote_multi_process_p (rs)) - xsnprintf (buf, sizeof buf, "Thread %d.%ld", - ptid_get_pid (ptid), ptid_get_lwp (ptid)); + if (ptid_get_lwp (ptid) == 0) + return normal_pid_to_str (ptid); + else + xsnprintf (buf, sizeof buf, "Thread %d.%ld", + ptid_get_pid (ptid), ptid_get_lwp (ptid)); else xsnprintf (buf, sizeof buf, "Thread %ld", ptid_get_lwp (ptid)); @@ -11870,6 +11949,7 @@ Specify the serial device it is connected to (e.g. /dev/ttya)."; extended_remote_ops.to_kill = extended_remote_kill; extended_remote_ops.to_supports_disable_randomization = extended_remote_supports_disable_randomization; + extended_remote_ops.to_follow_fork = remote_follow_fork; } static int |