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Subject2.2.X and chat (pppd)
I wonder if this is a well-known problem. I have been using the 2.0.X
kernels on my home pc and now moved to 2.2.X. Libc is 5.4.46. Compiled
ppp-2.3.7 which worked fine in linux-2.0.X but not in linux-2.2.X. To be
more precise, chat didn't work in 2.2.9.

chat wrote "\rAT\r" to the modem, one character at a time, with
usleep(10000) between characters. In 2.0.37pre12 it then read from the modem
"\rAT\r\r\nOK" etc but in 2.2.9 just "\rAT\r" and nothing more.

It started working ok after I doubled the usleep. Why? (The modem did
receive the final \r also in 2.2.9 in case of usleep(10000) because it
echoed it. And in 2.0.X it works ok.)

It's a 486, 100 MHz. 16450, 115200 b/s to a USR Sportster Flash (V.90).


--- ppp-2.3.7/chat/chat.c.orig Wed Mar 31 15:27:14 1999
+++ ppp-2.3.7/chat/chat.c Tue May 25 00:43:32 1999
@@ -1149,7 +1149,7 @@
int status;
char ch = c;

- usleep(10000); /* inter-character typing delay (?) */
+ usleep(20000); /* inter-character typing delay (?) */

status = write(1, &ch, 1);

-
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