tkill(2) - Linux man page

Name

tkill - send a signal to a single process

Synopsis

int tkill(int tid, int sig);

Description

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(2). 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.

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

tkill() is supported since Linux 2.4.19 / 2.5.4.

Conforming to

tkill() is 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).

Referenced By

clone(2), tgkill(2)