Blame SOURCES/telnetd-0.17-pty_read.patch

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--- telnetd/telnetd.c	2005-01-19 14:37:25.000000000 +0000
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+++ telnetd/telnetd.c.new	2005-01-19 14:48:12.000000000 +0000
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@@ -697,6 +697,7 @@
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     int on = 1;
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     char *HE;
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     const char *IM;
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+    int pty_read_ok = 0; /* track whether the pty read has worked yet */
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     /*
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      * Initialize the slc mapping table.
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@@ -1016,12 +1017,13 @@
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 	     * off the master side before the slave side is
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 	     * opened, we get EIO.
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 	     */
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-	    if (pcc < 0 && (errno == EWOULDBLOCK || errno == EIO)) {
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+	    if (pcc < 0 && (errno == EWOULDBLOCK || (errno == EIO && pty_read_ok == 0))) {
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 		pcc = 0;
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 	    } 
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 	    else {
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 		if (pcc <= 0)
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 		    break;
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+		pty_read_ok = 1;	/* mark connection up for read */
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 #ifdef	LINEMODE
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 				/*
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 				 * If ioctl from pty, pass it through net