fangpeina opened a new pull request, #3724:
URL: https://github.com/apache/nuttx-apps/pull/3724
## Summary
Add a `stty` command to NuttX, providing a standard Unix-like interface for
viewing and configuring terminal (TTY) device settings at runtime via
termios.
## Impact
- **Features**: Adds `stty` utility for runtime terminal configuration
- **User Experience**: Users can inspect and modify TTY settings from NSH
- **Build**: No build system changes; new `CONFIG_SYSTEM_STTY` option,
depends on `CONFIG_SERIAL_TERMIOS`
## Testing
Testing on sim, qemu and physical device.
### Configuration:
- **Board**: sim:nsh (Linux host)
- **Config**: `CONFIG_SIM_UART_NUMBER=1`, `CONFIG_SIM_UART_PTY=y`,
`CONFIG_SERIAL_TERMIOS=y`, `CONFIG_SYSTEM_STTY=y`
### Runtime Test Results(sim):
```
nsh> stty -F /dev/ttySIM0
/dev/ttySIM0 connected to pseudotty: /dev/pts/31
Terminal settings for /dev/ttySIM0:
speed unknown or not supported by driver; min = 1; time = 0;
c_iflag: 0x00000000 -icrnl -igncr -inlcr
c_oflag: 0x00000000 -opost -onlcr -ocrnl
c_lflag: 0x00000000 -echo -icanon -isig
c_cflag: 0x000000bf -clocal cread -cstopb
nsh> stty -F /dev/ttySIM0 cooked
/dev/ttySIM0 connected to pseudotty: /dev/pts/31
Settings applied to /dev/ttySIM0
nsh> stty -F /dev/ttySIM0
/dev/ttySIM0 connected to pseudotty: /dev/pts/31
Terminal settings for /dev/ttySIM0:
speed unknown or not supported by driver; min = 1; time = 0;
c_iflag: 0x00000100 icrnl -igncr -inlcr
c_oflag: 0x00000005 opost onlcr -ocrnl
c_lflag: 0x0000000b echo icanon isig
c_cflag: 0x000000bf -clocal cread -cstopb
nsh> stty -F /dev/ttySIM0 raw -echo
/dev/ttySIM0 connected to pseudotty: /dev/pts/31
Settings applied to /dev/ttySIM0
nsh> stty -F /dev/ttySIM0
/dev/ttySIM0 connected to pseudotty: /dev/pts/31
Terminal settings for /dev/ttySIM0:
speed unknown or not supported by driver; min = 1; time = 0;
c_iflag: 0x00000000 -icrnl -igncr -inlcr
c_oflag: 0x00000004 -opost onlcr -ocrnl
c_lflag: 0x00000000 -echo -icanon -isig
c_cflag: 0x000000bf -clocal cread -cstopb
nsh>
nsh> stty
Terminal settings for stdin:
speed unknown or not supported by driver; min = 1; time = 0;
c_iflag: 0x00000100 icrnl -igncr -inlcr
c_oflag: 0x00000005 opost onlcr -ocrnl
c_lflag: 0x0000000b echo icanon isig
c_cflag: 0x000000bf -clocal cread -cstopb
nsh> stty -F /dev/null
ERROR: /dev/null is not a TTY
nsh> stty -F /dev/noexist
ERROR: Failed to open /dev/noexist: 2
```
### Runtime Test Results(goldfish-armv7a-ap):
```
goldfish-armv7a-ap> stty -F /dev/ttyS1
Terminal settings for /dev/ttyS1:
speed 115200 baud; min = 1; time = 0;
c_iflag: 0x00000100 icrnl -igncr -inlcr
c_oflag: 0x00000005 opost onlcr -ocrnl
c_lflag: 0x0000000b echo icanon isig
c_cflag: 0x000000b0 -clocal cread -cstopb
```
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