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tkill() - Unix, Linux System Call
tkill - send a signal to a single process
int tkill(int tid, int sig);
tkill() system call is analogous to
except when the specified process is part of a thread group
(created by specifying the CLONE_THREAD flag in the call to clone).
Since all the processes in a thread group have the same PID,
they cannot be individually signalled with
tkill(), however, one can address each process
by its unique TID.
These are the raw system call interfaces, meant for internal
thread library use.
On success, zero is returned.
On error, -1 is returned, and errno
is set appropriately.
An invalid TID or signal was specified.
For the required permissions, see
No process with the specified thread ID (and thread group ID) exists.
tkill() is supported since Linux 2.4.19 / 2.5.4.
tkill() is Linux specific and should not be used
in programs that are intended to be portable.
Glibc does not provide wrapper for these system calls; call them using