Re: backtrace_on_internal_error

Andres Freund <andres@anarazel.de> writes:
>> I think I figured it it out. Looks like we need to translate a closed socket
>> (recvfrom() returning 0) to ECONNRESET or such.

> Seems like we should just treat errno == 0 as a reason to emit the "EOF
> detected" message?

Agreed.  I think we want to do that after the initial handshake,
too, so maybe as attached.

            regards, tom lane

diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 6b8125695a..f0b35f08c6 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -460,6 +460,7 @@ aloop:
      * per-thread error queue following another call to an OpenSSL I/O
      * routine.
      */
+    errno = 0;
     ERR_clear_error();
     r = SSL_accept(port->ssl);
     if (r <= 0)
@@ -496,7 +497,7 @@ aloop:
                                          WAIT_EVENT_SSL_OPEN_SERVER);
                 goto aloop;
             case SSL_ERROR_SYSCALL:
-                if (r < 0)
+                if (r < 0 && errno != 0)
                     ereport(COMMERROR,
                             (errcode_for_socket_access(),
                              errmsg("could not accept SSL connection: %m")));
@@ -732,7 +733,7 @@ be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
             break;
         case SSL_ERROR_SYSCALL:
             /* leave it to caller to ereport the value of errno */
-            if (n != -1)
+            if (n != -1 || errno == 0)
             {
                 errno = ECONNRESET;
                 n = -1;