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authorJohn Högberg <[email protected]>2017-07-10 08:28:09 +0200
committerJohn Högberg <[email protected]>2017-07-10 08:28:09 +0200
commit518bfe032f201bd236ac1c876de1c4b9321f73dc (patch)
tree5e3c6aaf85e942e137341ed08754cc2b034276be /erts/emulator/drivers
parent9b24da12c766d15493d9c99be18f5a14498ec558 (diff)
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Add a dedicated close function for TCP ports to prevent issues like ERL-430/448
Diffstat (limited to 'erts/emulator/drivers')
-rw-r--r--erts/emulator/drivers/common/inet_drv.c46
1 files changed, 29 insertions, 17 deletions
diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index d87fa3f268..2a833ca83e 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -1256,6 +1256,8 @@ static int tcp_shutdown_error(tcp_descriptor* desc, int err);
static int tcp_inet_output(tcp_descriptor* desc, HANDLE event);
static int tcp_inet_input(tcp_descriptor* desc, HANDLE event);
+static void tcp_desc_close(tcp_descriptor*);
+
#ifdef HAVE_UDP
typedef struct {
inet_descriptor inet; /* common data structure (DON'T MOVE) */
@@ -9138,16 +9140,31 @@ static void tcp_inet_stop(ErlDrvData e)
tcp_descriptor* desc = (tcp_descriptor*)e;
DEBUGF(("tcp_inet_stop(%ld) {s=%d\r\n",
(long)desc->inet.port, desc->inet.s));
+
tcp_close_check(desc);
- /* free input buffer & output buffer */
- if (desc->i_buf != NULL)
- release_buffer(desc->i_buf);
- desc->i_buf = NULL; /* net_mess2 may call this function recursively when
- faulty messages arrive on dist ports*/
+ tcp_clear_input(desc);
+
DEBUGF(("tcp_inet_stop(%ld) }\r\n", (long)desc->inet.port));
inet_stop(INETP(desc));
}
+/* Closes a tcp descriptor without leaving things hanging; the VM keeps trying
+ * to flush IO queues as long as it contains anything even after the port has
+ * been closed from the erlang side, which is desired behavior (Think escripts
+ * writing to files) but pretty hopeless if the underlying fd has been set to
+ * INVALID_SOCKET through desc_close.
+ *
+ * This function should be used in place of desc_close/erl_inet_close in all
+ * TCP-related operations. Note that this only closes the desc cleanly; it
+ * will be freed through tcp_inet_stop later on. */
+static void tcp_desc_close(tcp_descriptor* desc)
+{
+ tcp_clear_input(desc);
+ tcp_clear_output(desc);
+
+ erl_inet_close(INETP(desc));
+}
+
/* TCP requests from Erlang */
static ErlDrvSSizeT tcp_inet_ctl(ErlDrvData e, unsigned int cmd,
char* buf, ErlDrvSizeT len,
@@ -9392,7 +9409,7 @@ static ErlDrvSSizeT tcp_inet_ctl(ErlDrvData e, unsigned int cmd,
case INET_REQ_CLOSE:
DEBUGF(("tcp_inet_ctl(%ld): CLOSE\r\n", (long)desc->inet.port));
tcp_close_check(desc);
- erl_inet_close(INETP(desc));
+ tcp_desc_close(desc);
return ctl_reply(INET_REP_OK, NULL, 0, rbuf, rsize);
@@ -9516,8 +9533,7 @@ static void tcp_inet_timeout(ErlDrvData e)
set_busy_port(desc->inet.port, 0);
inet_reply_error_am(INETP(desc), am_timeout);
if (desc->send_timeout_close) {
- tcp_clear_output(desc);
- erl_inet_close(INETP(desc));
+ tcp_desc_close(desc);
}
}
else {
@@ -9531,7 +9547,7 @@ static void tcp_inet_timeout(ErlDrvData e)
else if ((state & INET_STATE_CONNECTING) == INET_STATE_CONNECTING) {
/* assume connect timeout */
/* close the socket since it's not usable (see man pages) */
- erl_inet_close(INETP(desc));
+ tcp_desc_close(desc);
async_error_am(INETP(desc), am_timeout);
}
else if ((state & INET_STATE_ACCEPTING) == INET_STATE_ACCEPTING) {
@@ -9694,8 +9710,7 @@ static int tcp_recv_closed(tcp_descriptor* desc)
/* passive mode do not terminate port ! */
tcp_clear_input(desc);
if (desc->inet.exitf) {
- tcp_clear_output(desc);
- desc_close(INETP(desc));
+ tcp_desc_close(desc);
} else {
desc_close_read(INETP(desc));
}
@@ -9738,7 +9753,7 @@ static int tcp_recv_error(tcp_descriptor* desc, int err)
driver_cancel_timer(desc->inet.port);
tcp_clear_input(desc);
if (desc->inet.exitf) {
- desc_close(INETP(desc));
+ tcp_desc_close(desc);
} else {
desc_close_read(INETP(desc));
}
@@ -10387,9 +10402,6 @@ static int tcp_send_or_shutdown_error(tcp_descriptor* desc, int err)
set_busy_port(desc->inet.port, 0);
}
- tcp_clear_output(desc);
- tcp_clear_input(desc);
-
/*
* We used to handle "expected errors" differently from unexpected ones.
* Now we handle all errors in the same way (unless the show_econnreset
@@ -10410,10 +10422,10 @@ static int tcp_send_or_shutdown_error(tcp_descriptor* desc, int err)
if (desc->inet.exitf)
driver_exit(desc->inet.port, 0);
else
- desc_close(INETP(desc));
+ tcp_desc_close(desc);
} else {
tcp_close_check(desc);
- erl_inet_close(INETP(desc));
+ tcp_desc_close(desc);
if (desc->inet.caller) {
if (show_econnreset)