zs39 opened a new pull request, #3283:
URL: https://github.com/apache/nuttx-apps/pull/3283
## Summary
The previous method of terminating the dhcp daemon via a global variable has
been removed; instead, the `kill pid` command is used. Also, because the
original `dhcp_start` method creates tasks via `task_create`, which is not
supported in kernel mode, `dhcp_start` is not compiled in kernel mode. The
daemon can be started in kernel mode using `dhcpd xxx &`.
## Impact
The dhcpd_start and dhcpd_stop functions
## Testing
Tested normally in flat mode
```
nsh> dhcpd_start eth0
nsh> ps
TID PID PPID PRI POLICY TYPE NPX STATE EVENT SIGMASK
STACK COMMAND
0 0 0 0 FIFO Kthread - Ready
0000000000000000 0069568 Idle_Task
1 0 0 224 FIFO Kthread - Waiting Semaphore
0000000000000000 0067448 hpwork 0x400b8020 0x400b80a0
2 0 0 100 FIFO Kthread - Waiting Semaphore
0000000000000000 0067448 lpwork 0x400b80e0 0x400b8160
3 3 0 100 FIFO Task - Running
0000000000000000 0067488 nsh_main
5 5 4 100 FIFO Task - Waiting Semaphore
0000000000000000 0067464 dhcpd eth0
nsh> dhcpd_stop
nsh> ps
TID PID PPID PRI POLICY TYPE NPX STATE EVENT SIGMASK
STACK COMMAND
0 0 0 0 FIFO Kthread - Ready
0000000000000000 0069568 Idle_Task
1 0 0 224 FIFO Kthread - Waiting Semaphore
0000000000000000 0067448 hpwork 0x400b8020 0x400b80a0
2 0 0 100 FIFO Kthread - Waiting Semaphore
0000000000000000 0067448 lpwork 0x400b80e0 0x400b8160
3 3 0 100 FIFO Task - Running
0000000000000000 0067488 nsh_main
nsh>
```
The build process works correctly in kernel mode and also functions properly
on the internal QEMU platform.
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