[PATCH] Fix two bugs in the limit of large numbers of sockets:
Erik M. Bray
erik.m.bray@gmail.com
Tue Nov 7 13:45:00 GMT 2017
* Fix the maximum number of sockets allowed in the session to 2048,
instead of making it relative to sizeof(wsa_event).
The original choice of 2048 was in order to fit the wsa_events array
in the .cygwin_dll_common shared section, but there is still enough
room to grow there to have 2048 sockets on 64-bit as well.
* Return an error and set errno=ENOBUF if a socket can't be created
due to this limit being reached.
---
winsup/cygwin/fhandler_socket.cc | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/winsup/cygwin/fhandler_socket.cc b/winsup/cygwin/fhandler_socket.cc
index 7a6dbdc..b8eda57 100644
--- a/winsup/cygwin/fhandler_socket.cc
+++ b/winsup/cygwin/fhandler_socket.cc
@@ -496,7 +496,7 @@ fhandler_socket::af_local_set_secret (char *buf)
/* Maximum number of concurrently opened sockets from all Cygwin processes
per session. Note that shared sockets (through dup/fork/exec) are
counted as one socket. */
-#define NUM_SOCKS (32768 / sizeof (wsa_event))
+#define NUM_SOCKS ((unsigned int) 2048)
#define LOCK_EVENTS \
if (wsock_mtx && \
@@ -623,7 +623,14 @@ fhandler_socket::init_events ()
NtClose (wsock_mtx);
return false;
}
- wsock_events = search_wsa_event_slot (new_serial_number);
+ if (!(wsock_events = search_wsa_event_slot (new_serial_number)));
+ {
+ set_errno (ENOBUFS);
+ NtClose (wsock_evt);
+ NtClose (wsock_mtx);
+ return false;
+ }
+
/* sock type not yet set here. */
if (pc.dev == FH_UDP || pc.dev == FH_DGRAM)
wsock_events->events = FD_WRITE;
--
2.8.3
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