Optimize cygwin on recent windows version (Vista and Seven)

Tue Jun 16 00:28:00 GMT 2009

2009年6月15日 Christopher Faylor:
>>One issue that I've noticed on Windows 7, both with Cygwin 1.5 and
>>1.7, is that trying to log a utmp entry when starting a terminal can
>>take up to half a minute, presumably due to waiting for some sort of
>>timeout.
>> Sorry but this isn't a much more useful report.

You're right, sorry. Here's how I got it: repeatedly invoke rxvt,
xterm, or 'mintty -u'. The first invocation would usually be fine, but
subsequent invocations would hang for something like half a minute.
When disabling the utmp entry, using 'rxvt -ut', 'xterm -ut', or
mintty without -u, there'd be no delay.
In MinTTY, the -u option activates the following bit of code. fd is
the master side of its pseudo terminal:
static struct utmp ut;
...
 ut.ut_type = USER_PROCESS;
 ut.ut_pid = pid;
 ut.ut_time = time(0);
 char *dev = ptsname(fd);
 if (dev) {
 if (strncmp(dev, "/dev/", 5) == 0)
 dev += 5;
 strncpy(ut.ut_line, dev ?: "?", sizeof ut.ut_line);
 if (strncmp(dev, "pty", 3) == 0 || strncmp(dev, "tty", 3) == 0)
 dev += 3;
 strncpy(ut.ut_id, dev ?: "?", sizeof ut.ut_id);
 }
 strncpy(ut.ut_user, (pw ? pw->pw_name : 0) ?: "?", sizeof ut.ut_user);
 login(&ut);
Unfortunately my Windows 7 machine went belly-up, so I can't look into
this further at the moment.
Andy
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