generic_unix: use a graceful close for TCP server sockets

Fix a behavior with init_server_tcp_socket that surfaced in
FreeBSD CI failures.

Signed-off-by: Paul Guyot <pguyot@kallisys.net>

Author: pguyot

CHANGELOG.md

@@ -70,6 +70,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixed several underallocation issues that could trigger data corruption on `binary:replace`, `zlib:compress` and bsd socket recv code.
 - Fixed a bug where `catch` would raise on regular atom results
 - Fixed ESP32 socket driver holding the global socket-list lock across blocking TCP connects, leaking the port on connect failure, losing concurrent `accept` waiters, leaking `netbuf` on receive error paths, and a recycled-`netconn` race between socket close and the event handler
+- Fixed generic_unix TCP server sockets performing an abortive close that could truncate replies awaiting ack
 
 ## [0.7.0-alpha.1] - 2026-04-06
 

src/platforms/generic_unix/lib/socket_driver.c

@@ -367,17 +367,8 @@ static term init_server_tcp_socket(Context *ctx, SocketDriverData *socket_data,
     }
     socket_data->sockfd = sockfd;
 
-    //
-    // set socket options:
-    //      reuse-address
-    //      disable linger
-    //
     int flag = 1;
     setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char *) &flag, sizeof(int));
-    struct linger sl;
-    sl.l_onoff = 1;
-    sl.l_linger = 0;
-    setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &sl, sizeof(sl));
 
     if (fcntl(socket_data->sockfd, F_SETFL, O_NONBLOCK) == -1) {
         close(sockfd);