Frank Lichtenheld discovered that openpty() doesn't work anymore when
/dev/pts is not present.
We bisected this down to
commit bbb63c514a3464342967237a51a21ea8f61ab951
Author: Wanlong Gao <gaowanl...@cn.fujitsu.com>
Subject: drivers:tty:fix up ENOIOCTLCMD error handling
The original program triggering the error was pptpd, but
the test program below is sufficient:
----
#include <stdio.h>
#include <pty.h>
int main(void) {
int pty_fd, tty_fd;
if (openpty(&pty_fd, &tty_fd, NULL, NULL, NULL) != 0) {
perror("openpty");
return 1;
}
return 0;
}
----
[ compile with cc -lutil pty.c -o pty ]
If devpts is available or above commit reverted openpty works again.
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