zhhyu7 opened a new pull request, #17709:
URL: https://github.com/apache/nuttx/pull/17709
## Summary
after the listener fd is closed, the half-open connections associated
with the listener are not reclaimed. According to the protocol standard,
they should be reclaimed in a timely manner.
## Impact
tcp::listen
## Testing
sim:matter with test code
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <signal.h>
#include <poll.h>
#define SERVER_IP "10.0.1.2"
#define PORT 7777
#define BUFFER_SIZE 1024
int main(int argc, char *argv[]) {
int sockfd;
struct sockaddr_in server_addr;
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket creation failed");
exit(EXIT_FAILURE);
}
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORT);
if (inet_pton(AF_INET, SERVER_IP, &server_addr.sin_addr) <= 0) {
perror("invalid address");
close(sockfd);
exit(EXIT_FAILURE);
}
bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));
listen(sockfd, 5);
sleep(10);
close(sockfd);
return 0;
}
```
test log without this patch
```
NuttShell (NSH) NuttX-12.12.0-RC0
MOTD: username=admin password=Administrator
nsh> cat /proc/net/tcp
nsh> hello
nsh>
nsh> cat /proc/net/tcp
TCP sl st flg ref tmr uack nrt txsz rxsz local_address
remote_address
1: 02 0 1 3 1 0 0 0 10.0.1.2:7777
10.0.1.1:60678
nsh>
```
test log with this patch
```
NuttShell (NSH) NuttX-12.12.0-RC0
MOTD: username=admin password=Administrator
nsh> hello
nsh>
nsh> cat /proc/net/tcp
nsh>
```
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