```
int gdb_read_smp_packet(struct connection *connection,
char const *packet, int packet_size)
{
struct target *target = get_target_from_connection(connection);
int retval = ERROR_OK;
LOG_WARNING(DEPRECATED_MSG);
if (target->smp) {
if (strncmp(packet, "jc", 2) == 0) {
const uint32_t len =
sizeof(target->gdb_service->core[0]);
char hex_buffer[len * 2 + 1];
uint8_t buffer[len];
buf_set_u32(buffer, 0, len * 8,
target->gdb_service->core[0]);
size_t pkt_len = hexify(hex_buffer, buffer,
sizeof(buffer),
sizeof(hex_buffer));
retval = gdb_put_packet(connection, hex_buffer,
pkt_len);
}
// BUG: <-- MISSING ELSE HERE
} else
retval = gdb_put_packet(connection, "E01", 3);
return retval;
}
```
should have `else` with:
```
gdb_put_packet(connection, "", 0);
```
---
**[tickets:#449] GDB Server Should Return an Empty Response for Undefined GDB
Packets**
**Status:** new
**Milestone:** 0.10.0
**Created:** Wed Feb 12, 2025 07:01 PM UTC by patryk sondej
**Last Updated:** Wed Feb 12, 2025 07:01 PM UTC
**Owner:** nobody
Hi.
Not all undefined GDB packets return an empty response.
This is issue when debugging using LLDB. Since the openocd does not immediately
return an empty response, each `nexti` command becomes very slow due to LLDB
waiting for a receive timeout.
Eg:
```
(gdb) maintenance packet jThreadsInfo
sending: jThreadsInfo
Ignoring packet error, continuing...
error while fetching packet from remote target
(gdb) maintenance packet xxx
sending: xxx
received: ""
(gdb) maintenance packet jxxx
sending: jxxx
Ignoring packet error, continuing...
error while fetching packet from remote target
```
I found out, a lot of gdb packets in openocd has missing `else` with empty
response.
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