#6 Under stress test accept starts failing

[Marcio Marchini]

We run Emu under stress tests under Linux and after a while the wait_for_new_connections starts failing.

The error codes are -28,24. The first one tells us that it is a problem with accept. The second one is mode details, from UNIX. We have to find out what this error code means.

We're basically getting a callback from select for this server socket, which normally means there's an incoming connection. However, when we try to accept, we get the error. Not sure what it going on.

[Nobody/Anonymous]

http://www.ecst.csuchico.edu/~beej/guide/net/man.cgi?select

Under the following conditions, select() fails and sets errno to:

[EBADF] One or more of the file descriptor sets specified
a file descriptor that is not a valid open file
descriptor.

[EINTR] The select() function was interrupted before any
of the selected events occurred and before the
timeout interval expired. If SA_RESTART has been
set for the interrupting signal, it is
implementation-dependent whether select() restarts
or returns with EINTR.

[EINVAL] An invalid timeout interval was specified.

[EINVAL] The nfds argument is less than 0, or greater than
or equal to FD_SETSIZE.

[EINVAL] One of the specified file descriptors refers o a
STREAM or multiplexer that is linked (directly or
indirectly) downstream from a multiplexer.

[Nobody/Anonymous]

http://guma.ii.fmph.uniba.sk/linux/usr/src/linux/include/asm/errno.h.html

12: #define EBADF 9 /* Bad file number */
7: #define EINTR 4 /* Interrupted system call */
25: #define EINVAL 22 /* Invalid argument */
27: #define EMFILE 24 /* Too many open files */

So, 24 is "too many open files". Are we leaking socket handles ?