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See discussion in http://bugs.debian.org/755295
and bug report on comp.lang.tcl on July 1st 2015
(“'expect' losing data due to tcl buffering”)
--- a/term/ptyio.c
+++ b/term/ptyio.c
@@ -350,6 +350,16 @@ pty_io_read (struct trivfs_protid *cred,
size++;
}
+ /*
+ * Linux never returns more than this, and at least TCL happens to depend on
+ * this behavior. This was discussed in http://bugs.debian.org/755295 and
+ * raised to TCL, with no answer so far.
+ */
+#define LINUXISH_READ_MAX 4095
+ if (cred->po->openmodes & O_NONBLOCK)
+ if (amount > LINUXISH_READ_MAX)
+ amount = LINUXISH_READ_MAX;
+
if (size > amount)
size = amount;
if (size > *datalen)
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