|| ||syscall documentation (3)|
|| ||Thu, 6 Feb 2003 21:09:24 +0100 (MET)|
The next new page is tkill.2
tkill - send a signal to a single process
_syscall2(int, tkill, pid_t, tid, int, sig)
int tkill(pid_t tid, int sig);
The 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).
Since all the processes in a thread group have the same
PID, they cannot be individually signalled with kill.
With tkill, however, one can address each process by its
On success, zero is returned. On error, -1 is returned,
and errno is set appropriately.
EINVAL An invalid TID or signal was specified.
ESRCH No process with the specified TID exists.
EPERM The caller did not have permission to send the sig
nal to the specified process. For a process to be
allowed to send a signal, it must either have root
privileges, or its real or effective user ID must
be equal to the real or saved set-user-ID of the
tkill is Linux specific and should not be used in programs
that are intended to be portable.
Linux 2.4.20 2003-02-01 TKILL(2)
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