Re: [RFC patch 0/3] signals: add rt_tgsigqueueinfo syscall V2

[CC+=linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org]

On Wed, Oct 1, 2008 at 12:01 PM, Thomas Gleixner [off-list ref] wrote:

Changes vs. V1: compat_sys_rt_sigqueueinfo implemented. Thanks Roland !

sys_kill has a counterpart sys_tgkill which allows to send signals to
a particular thread. sys_rt_sigqueueinfo is lacking such a counterpart.

Aside of the asymetry it is a show stopper for migrating applications
from other unix-alike RTOSes.

The following patch series implements rt_tgsigqueueinfo and hooks it
up for x86.

This is an excellent candidate for CCing to the new linux-api@vger
(http://thread.gmane.org/gmane.linux.ltp/5658/), since it is an API
change.

Find below the raw documentation.

Thanks -- I'll work that up into a man page when this gets closer to release.

Cheers,

Michael

----

NAME
      rt_tgsigqueueinfo - Send signal information to a signal to a thread

SYNOPSIS
      long sys_rt_tgsigqueueinfo (int tgid, int tid, int sig, siginfo_t *uinfo);

DESCRIPTION

      rt_tgsigqueueinfo sends signal sig information uinfo to the
      thread with the thread ID tid in the thread group tgid.  (By
      contrast, rt_sigqueueinfo(2) can only be used to send a signal
      info to a process (i.e., thread group) as a whole, and the
      signal will be delivered to an arbitrary thread within that
      process.)

RETURN VALUE

      rt_tgsigqueueinfo returns 0 on success; otherwise,
      rt_sigqueueinfo returns one of the errors listed in the
      "Errors" section.

ERRORS
      -EFAULT
             An invalid value for uinfo was specified.

      -EINVAL
             An invalid TID, TGID or signal was specified.

      -EPERM
             Permission denied.  For the required permissions,
             see rt_sigqueueinfo(2).

      -ESRCH
             No process with the specified thread ID and thread group
             ID exists.

-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
git://git.kernel.org/pub/scm/docs/man-pages/man-pages.git
man-pages online: http://www.kernel.org/doc/man-pages/online_pages.html
Found a bug? http://www.kernel.org/doc/man-pages/reporting_bugs.html
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