# HG changeset patch
# User Olaf Wintermann <olaf.wintermann@gmail.com>
# Date 1737736978 -3600
# Node ID 3f8c587734aa95d787c121e266c922610e9fbec9
# Parent  fed45fc71e7cb11473a010bf22e3cc0a04964439
add error handling in case accept fails
in case of EMFILE, sleep for some seconds

diff -r fed45fc71e7c -r 3f8c587734aa src/server/daemon/httplistener.c
--- a/src/server/daemon/httplistener.c	Sat Jan 18 12:21:50 2025 +0100
+++ b/src/server/daemon/httplistener.c	Fri Jan 24 17:42:58 2025 +0100
@@ -617,6 +617,12 @@
     log_ereport(LOG_DEBUG, "acceptor: %p listener: %p start", acceptor, acceptor->listener);
     ws_atomic_inc32(acceptors_running);
     
+    // in case the system is too busy and we get EMFILE (Too many open files)
+    // we wait for busy_sleep_time seconds
+    // the sleep time is increased after 5 attempts
+    int busy_sleep_time = 5;
+    int sleep_counter = 0;
+    
     for (;;) {
         // accept connections
         int clientfd;
@@ -631,10 +637,27 @@
         if (clientfd == -1) {
             log_ereport(LOG_FAILURE, "accept %s failed: %s", acceptor->ipv6 ? "ipv6" : "ipv4", strerror(errno));
             
+            switch(errno) {
+                case EBADF: acceptor->exit = 1; break;
+                case EINTR: continue;
+                case EINVAL: acceptor->exit = 1; break;
+                case EMFILE: {
+                    sleep(busy_sleep_time);
+                    sleep_counter++;
+                    if(sleep_counter >= 5) {
+                        sleep_counter = 0;
+                        busy_sleep_time += 5;
+                    }
+                }
+            }
+            
             if(acceptor->exit) {
                 log_ereport(LOG_VERBOSE, "acceptor thread %p: listener: %p exit", acceptor, acceptor->listener);
                 break;
             }
+            
+            
+            
             continue;
         }
         
@@ -716,6 +739,9 @@
             log_ereport(LOG_VERBOSE, "acceptor thread %p: listener: %p exit", acceptor, acceptor->listener);
             break;
         }
+        
+        busy_sleep_time = 5; // reset sleep time
+        sleep_counter = 0;
     }
     
     if(ws_atomic_dec32(acceptors_running) == 0) {