On Wed, Dec 03, 2025 at 11:26:15AM +0000, Daniel P. Berrangé wrote:
> Normally bash in F42 runs with a prompt and we see
>
> 61385 ioctl(0,TCGETS,0x00007f34260697e8) = 0 ({c_iflag = ICRNL|IXON,c_oflag
> = OPOST|ONLCR,c_cflag = B38400,CS8,CREAD,c_lflag =
> ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN,c_cc = "^C^\^?
> ^U^D",c_line = '^@'})
> 61385 ioctl(2,TCGETS,0x00007f34260697e8) = 0 ({c_iflag = ICRNL|IXON,c_oflag
> = OPOST|ONLCR,c_cflag = B38400,CS8,CREAD,c_lflag =
> ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN,c_cc = "^C^\^?
> ^U^D",c_line = '^@'})
>
> When I redirect stderr to a file/pipe the latter ioctl
> obviously fails:
>
> 60841 ioctl(0,TCGETS,0x00007f19561fe7e8) = 0 ({c_iflag = ICRNL|IXON,c_oflag
> = OPOST|ONLCR,c_cflag = B38400,CS8,CREAD,c_lflag =
> ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN,c_cc = "^C^\^?
> 60841 ioctl(2,TCGETS,0x00007f19561fe7e8) = -1 errno=25 (Inappropriate ioctl
> for device)
>
>
> Now looking at F43 bash I no longer see QEMU reporting TCGETS
> ioctl, instead I see
>
> 61809 ioctl(0,0x802c542a,0xd73fe8f4) = -1 errno=25 (Inappropriate ioctl for
> device)
>
> that suggests to me that bash is probably using a different (new?)
> ioctl that QEMU does not have emulation for currently.
IIUC, 0x802c542a corresponds to TCGETS2, and indeed QEMU does not
currently emulate TCGETS2 which can be seen with QEMU's logging:
# qemu-s390x -d unimp -L `pwd` ./usr/bin/bash 2>&1
Unsupported syscall: 383
Unsupported ioctl: cmd=0xffffffff802c542a
IOW, F43 or later will be broken until this is impl in QEMU
With regards,
Daniel
--
|: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org -o- https://fstop138.berrange.com :|
|: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
--
_______________________________________________
devel mailing list -- [email protected]
To unsubscribe send an email to [email protected]
Fedora Code of Conduct:
https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives:
https://lists.fedoraproject.org/archives/list/[email protected]
Do not reply to spam, report it:
https://pagure.io/fedora-infrastructure/new_issue
