From e8ca139ed036e6da8adf42fc6fbd93973b724d3c Mon Sep 17 00:00:00 2001 From: Simon Marchi Date: Fri, 15 Sep 2017 17:59:37 +0200 Subject: [PATCH] gdbserver: Move detach code to its own function The code required to handle the 'D' packet is non trivial, so move it out to its own function. The moved out code is identical, except for the call to strtol and some breaks that became returns. Tested manually, and by running gdb.base/*detach*.exp with native-gdbserver and native-extended-gdbserver. gdb/gdbserver/ChangeLog: * server.c (handle_detach): New function. (process_serial_event): Move code out, call handle_detach. --- gdb/gdbserver/ChangeLog | 5 ++ gdb/gdbserver/server.c | 186 +++++++++++++++++++++------------------- 2 files changed, 101 insertions(+), 90 deletions(-) diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog index d7980b0dbd..144e09afa3 100644 --- a/gdb/gdbserver/ChangeLog +++ b/gdb/gdbserver/ChangeLog @@ -1,3 +1,8 @@ +2017-09-15 Simon Marchi + + * server.c (handle_detach): New function. + (process_serial_event): Move code out, call handle_detach. + 2017-09-15 Simon Marchi * server.c (require_running): Rename to ... diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c index 8e0bf5ba78..3de7f16341 100644 --- a/gdb/gdbserver/server.c +++ b/gdb/gdbserver/server.c @@ -1157,6 +1157,100 @@ handle_search_memory (char *own_buf, int packet_len) free (pattern); } +/* Handle the "D" packet. */ + +static void +handle_detach (char *own_buf) +{ + require_running_or_return (own_buf); + + int pid; + + if (multi_process) + { + /* skip 'D;' */ + pid = strtol (&own_buf[2], NULL, 16); + } + else + pid = ptid_get_pid (current_ptid); + + if ((tracing && disconnected_tracing) || any_persistent_commands ()) + { + struct process_info *process = find_process_pid (pid); + + if (process == NULL) + { + write_enn (own_buf); + return; + } + + if (tracing && disconnected_tracing) + fprintf (stderr, + "Disconnected tracing in effect, " + "leaving gdbserver attached to the process\n"); + + if (any_persistent_commands ()) + fprintf (stderr, + "Persistent commands are present, " + "leaving gdbserver attached to the process\n"); + + /* Make sure we're in non-stop/async mode, so we we can both + wait for an async socket accept, and handle async target + events simultaneously. There's also no point either in + having the target stop all threads, when we're going to + pass signals down without informing GDB. */ + if (!non_stop) + { + if (debug_threads) + debug_printf ("Forcing non-stop mode\n"); + + non_stop = 1; + start_non_stop (1); + } + + process->gdb_detached = 1; + + /* Detaching implicitly resumes all threads. */ + target_continue_no_signal (minus_one_ptid); + + write_ok (own_buf); + return; + } + + fprintf (stderr, "Detaching from process %d\n", pid); + stop_tracing (); + if (detach_inferior (pid) != 0) + write_enn (own_buf); + else + { + discard_queued_stop_replies (pid_to_ptid (pid)); + write_ok (own_buf); + + if (extended_protocol || target_running ()) + { + /* There is still at least one inferior remaining or + we are in extended mode, so don't terminate gdbserver, + and instead treat this like a normal program exit. */ + last_status.kind = TARGET_WAITKIND_EXITED; + last_status.value.integer = 0; + last_ptid = pid_to_ptid (pid); + + current_thread = NULL; + } + else + { + putpkt (own_buf); + remote_close (); + + /* If we are attached, then we can exit. Otherwise, we + need to hang around doing nothing, until the child is + gone. */ + join_inferior (pid); + exit (0); + } + } +} + /* Parse options to --debug-format= and "monitor set debug-format". ARG is the text after "--debug-format=" or "monitor set debug-format". IS_MONITOR is non-zero if we're invoked via "monitor set debug-format". @@ -4003,13 +4097,10 @@ process_point_options (struct gdb_breakpoint *bp, char **packet) static int process_serial_event (void) { - char ch; - int i = 0; int signal; unsigned int len; int res; CORE_ADDR mem_addr; - int pid; unsigned char sig; int packet_len; int new_packet_len = -1; @@ -4026,8 +4117,7 @@ process_serial_event (void) } response_needed = 1; - i = 0; - ch = own_buf[i++]; + char ch = own_buf[0]; switch (ch) { case 'q': @@ -4037,91 +4127,7 @@ process_serial_event (void) handle_general_set (own_buf); break; case 'D': - require_running_or_break (own_buf); - - if (multi_process) - { - i++; /* skip ';' */ - pid = strtol (&own_buf[i], NULL, 16); - } - else - pid = ptid_get_pid (current_ptid); - - if ((tracing && disconnected_tracing) || any_persistent_commands ()) - { - struct process_info *process = find_process_pid (pid); - - if (process == NULL) - { - write_enn (own_buf); - break; - } - - if (tracing && disconnected_tracing) - fprintf (stderr, - "Disconnected tracing in effect, " - "leaving gdbserver attached to the process\n"); - - if (any_persistent_commands ()) - fprintf (stderr, - "Persistent commands are present, " - "leaving gdbserver attached to the process\n"); - - /* Make sure we're in non-stop/async mode, so we we can both - wait for an async socket accept, and handle async target - events simultaneously. There's also no point either in - having the target stop all threads, when we're going to - pass signals down without informing GDB. */ - if (!non_stop) - { - if (debug_threads) - debug_printf ("Forcing non-stop mode\n"); - - non_stop = 1; - start_non_stop (1); - } - - process->gdb_detached = 1; - - /* Detaching implicitly resumes all threads. */ - target_continue_no_signal (minus_one_ptid); - - write_ok (own_buf); - break; /* from switch/case */ - } - - fprintf (stderr, "Detaching from process %d\n", pid); - stop_tracing (); - if (detach_inferior (pid) != 0) - write_enn (own_buf); - else - { - discard_queued_stop_replies (pid_to_ptid (pid)); - write_ok (own_buf); - - if (extended_protocol || target_running ()) - { - /* There is still at least one inferior remaining or - we are in extended mode, so don't terminate gdbserver, - and instead treat this like a normal program exit. */ - last_status.kind = TARGET_WAITKIND_EXITED; - last_status.value.integer = 0; - last_ptid = pid_to_ptid (pid); - - current_thread = NULL; - } - else - { - putpkt (own_buf); - remote_close (); - - /* If we are attached, then we can exit. Otherwise, we - need to hang around doing nothing, until the child is - gone. */ - join_inferior (pid); - exit (0); - } - } + handle_detach (own_buf); break; case '!': extended_protocol = 1; -- 2.34.1