NAME
tkill, tgkill - send a signal to a single process
SYNOPSIS
I int tkill(int tid , int sig );
I int tgkill(int tgid , int tid , int sig );
DESCRIPTION
The
R tkill ()
system call is analogous to
kill(2),
except when the specified process is part of a thread group
(created by specifying the
CLONE_THREAD
flag in the call to
clone(2)).
Since all the processes in a thread group have the same PID,
they cannot be individually signaled with
kill(2).
With
R tkill (),
however, one can address each process
by its unique TID.
The
R tgkill ()
call improves on
R tkill ()
by allowing the caller to
specify the thread group ID of the thread to be signaled, protecting
against TID reuse.
If the tgid is specified as -1,
R tgkill ()
degenerates
into
R tkill ().
These are the raw system call interfaces, meant for internal
thread library use.
RETURN VALUE
On success, zero is returned.
On error, -1 is returned, and errno
is set appropriately.
ERRORS
EINVAL
An invalid TID or signal was specified.
EPERM
Permission denied.
For the required permissions, see
kill(2).
ESRCH
No process with the specified thread ID (and thread group ID) exists.
VERSIONS
R tkill ()
is supported since Linux 2.4.19 / 2.5.4.
R tgkill ()
was added in Linux 2.5.75.
CONFORMING TO
R tkill ()
and
R tgkill ()
are Linux specific and should not be used
in programs that are intended to be portable.
NOTES
Glibc does not provide wrapper for these system calls; call them using
syscall(2).
SEE ALSO
ČLÁNKY DO MAILU