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os: Use NotifyFd for ErrorConnMax 

Instead of open-coding a single FD wait, use NotifyFd to wait for the
FD to become readable before returning the error message.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Adam Jackson <ajax@redhat.com>
This commit is contained in:
Keith Packard 2016-05-24 20:51:31 -07:00 committed by Adam Jackson
parent 559aac2d71
commit c3fea428ae
1 changed files with 18 additions and 21 deletions
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35
os/connection.c
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@ -863,7 +863,6 @@ EstablishNewConnections(ClientPtr clientUnused, void *closure)
if (!AllocNewConnection(new_trans_conn, newconn, connect_time)) {
ErrorConnMax(new_trans_conn);
_XSERVTransClose(new_trans_conn);
}
return TRUE;
}
@ -881,30 +880,20 @@ QueueNewConnections(int fd, int ready, void *data)
* Fail a connection due to lack of client or file descriptor space
************/
#define BOTIMEOUT 200 /* in milliseconds */
static void
ErrorConnMax(XtransConnInfo trans_conn)
ConnMaxNotify(int fd, int events, void *data)
{
int fd = _XSERVTransGetConnectionNumber(trans_conn);
xConnSetupPrefix csp;
char pad[3] = { 0, 0, 0 };
struct iovec iov[3];
XtransConnInfo trans_conn = data;
char order = 0;
int whichbyte = 1;
struct timeval waittime;
fd_set mask;
/* if these seems like a lot of trouble to go to, it probably is */
waittime.tv_sec = BOTIMEOUT / MILLI_PER_SECOND;
waittime.tv_usec = (BOTIMEOUT % MILLI_PER_SECOND) *
(1000000 / MILLI_PER_SECOND);
FD_ZERO(&mask);
FD_SET(fd, &mask);
(void) Select(fd + 1, &mask, NULL, NULL, &waittime);
/* try to read the byte-order of the connection */
(void) _XSERVTransRead(trans_conn, &order, 1);
if (order == 'l' || order == 'B' || order == 'r' || order == 'R') {
xConnSetupPrefix csp;
char pad[3] = { 0, 0, 0 };
int whichbyte = 1;
struct iovec iov[3];
csp.success = xFalse;
csp.lengthReason = sizeof(NOROOM) - 1;
csp.length = (sizeof(NOROOM) + 2) >> 2;
@ -924,6 +913,15 @@ ErrorConnMax(XtransConnInfo trans_conn)
iov[2].iov_base = pad;
(void) _XSERVTransWritev(trans_conn, iov, 3);
}
RemoveNotifyFd(trans_conn->fd);
_XSERVTransClose(trans_conn);
}
static void
ErrorConnMax(XtransConnInfo trans_conn)
{
if (!SetNotifyFd(trans_conn->fd, ConnMaxNotify, X_NOTIFY_READ, trans_conn))
_XSERVTransClose(trans_conn);
}
/************
@ -1426,7 +1424,6 @@ AddClientOnOpenFD(int fd)
if (!AllocNewConnection(ciptr, fd, connect_time)) {
ErrorConnMax(ciptr);
_XSERVTransClose(ciptr);
return FALSE;
}