tkill (2)
Leading comments
Copyright (C) 2008 Michael Kerrisk <tmk.manpages@gmail.com> and Copyright 2003 Abhijit Menon-Sen <ams@wiw.org> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the t...
NAME
tkill, tgkill - send a signal to a threadSYNOPSIS
int tkill(int tid, int sig); int tgkill(int tgid, int tid, int sig);
Note: There are no glibc wrappers for these system calls; see NOTES.
DESCRIPTION
tgkill() sends the signal sig to the thread with the thread ID tid in the thread group tgid. (By contrast, kill(2) can be used to send a signal only to a process (i.e., thread group) as a whole, and the signal will be delivered to an arbitrary thread within that process.)tkill() is an obsolete predecessor to tgkill(). It allows only the target thread ID to be specified, which may result in the wrong thread being signaled if a thread terminates and its thread ID is recycled. Avoid using this system call.
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 thread ID, thread group ID, 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. tgkill() was added in Linux 2.5.75.CONFORMING TO
tkill() and tgkill() are Linux-specific and should not be used in programs that are intended to be portable.NOTES
See the description of CLONE_THREAD in clone(2) for an explanation of thread groups.Glibc does not provide wrappers for these system calls; call them using syscall(2).