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You are here: manpages





TKILL

Section: Linux Programmer's Manual (2)
Updated: 2014-12-31
Index Return to Main Contents
 

NAME

tkill, tgkill - send a signal to a thread  

SYNOPSIS

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).  

SEE ALSO

clone(2), gettid(2), kill(2), rt_sigqueueinfo(2)  

COLOPHON

This page is part of release 3.81 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
VERSIONS
CONFORMING TO
NOTES
SEE ALSO
COLOPHON


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