Date: Fri, 10 May 2002 08:13:20 -0400 (EDT) From: Daniel Eischen <eischen@pcnet1.pcnet.com> To: Victor Ivanov <v0rbiz@icon.bg> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: pthread app from init (/etc/ttys)? Message-ID: <Pine.GSO.4.10.10205100811090.22466-100000@pcnet1.pcnet.com> In-Reply-To: <20020510103805.A99419@icon.icon.bg>
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On Fri, 10 May 2002, Victor Ivanov wrote:
> Hi :)
>
> I'm developing an pthread app which is run from init on a virtual tty (it's
> not run from a user, it must be run automatically). Yesterday I upgraded to
> 4.6-PRERELEASE and the app started acting strangely.
> The app has a screen-oriented UI, and it needs threads to do data
> collecting and client/server communication "in the background" while
> showing some nice window oriented interface.
>
> To show the problem I've made a small app which opens the tty the same way
> as getty does it. First it chmod/chown/revokes it, the int opens it O_RDWR,
> and then it calls login_tty to make it the controlling terminal, stdin,
> stderr, stdout.
>
> All works fine as long as the app is not compiled/linked -pthread. In the
> latter case none of the initialization calls return error, but after that
> input/output to the console returns 'Resource temporary unavailable'.
>
> I've tried dup2-ing and TIOCSCTTY-ing and etc instead of using login_tty,
> but the result is just the same.
>
> I guess I should make some kind of wrapper app or start getty using
> autologin and specifiying the app as the user's shell (which user must
> be uid 0) ... but I really prefer the simple way.
>
> Any hints/ideas/workarounds?
You can try this patch (to -current, massage it a bit for -stable).
--
Dan Eischen
RCS file: /opt/d/CVS/src/lib/libc_r/uthread/uthread_init.c,v
retrieving revision 1.38
diff -u -r1.38 uthread_init.c
--- uthread_init.c 19 Mar 2002 22:58:56 -0000 1.38
+++ uthread_init.c 10 May 2002 11:15:09 -0000
@@ -173,37 +173,24 @@
if ((references[0] == NULL) || (libgcc_references[0] == NULL))
PANIC("Failed loading mandatory references in _thread_init");
- /*
- * Check for the special case of this process running as
- * or in place of init as pid = 1:
- */
- if (getpid() == 1) {
+ /* Handle standard I/O file descriptors. */
+ for (i = 0; i < 3; i++) {
/*
- * Setup a new session for this process which is
- * assumed to be running as root.
+ * Make sure the pipe does not get in the way of stdio:
*/
- if (setsid() == -1)
- PANIC("Can't set session ID");
- if (revoke(_PATH_CONSOLE) != 0)
- PANIC("Can't revoke console");
- if ((fd = __sys_open(_PATH_CONSOLE, O_RDWR)) < 0)
- PANIC("Can't open console");
- if (setlogin("root") == -1)
- PANIC("Can't set login to root");
- if (__sys_ioctl(fd,TIOCSCTTY, (char *) NULL) == -1)
- PANIC("Can't set controlling terminal");
- if (__sys_dup2(fd,0) == -1 ||
- __sys_dup2(fd,1) == -1 ||
- __sys_dup2(fd,2) == -1)
- PANIC("Can't dup2");
- }
-
- /* Get the standard I/O flags before messing with them : */
- for (i = 0; i < 3; i++)
+ if (_thread_kern_pipe[i] < 3) {
+ fd = __sys_fcntl(_thread_kern_pipe[i], F_DUPFD, 3);
+ if (fd == -1)
+ PANIC("Cannot create kernel pipe");
+ __sys_close(_thread_kern_pipe[i]);
+ _thread_kern_pipe[i] = fd;
+ }
+ /* Get the standard I/O flags before messing with them : */
if (((_pthread_stdio_flags[i] =
__sys_fcntl(i,F_GETFL, NULL)) == -1) &&
(errno != EBADF))
PANIC("Cannot get stdio flags");
+ }
/*
* Create a pipe that is written to by the signal handler to prevent
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