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.
Find below the raw documentation.
Thanks,
tglx
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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.
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