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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
TKILL(2) Linux Programmer's Manual TKILL(2)
tkill, tgkill - send a signal to a thread
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.
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.
On success, zero is returned. On error, -1 is returned, and errno is
set appropriately.
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.
EAGAIN The RLIMIT_SIGPENDING resource limit was reached and sig is a
real-time signal.
EAGAIN Insufficient kernel memory was available and sig is a real-
time signal.
tkill() is supported since Linux 2.4.19 / 2.5.4. tgkill() was added
in Linux 2.5.75.
tkill() and tgkill() are Linux-specific and should not be used in
programs that are intended to be portable.
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).
clone(2), gettid(2), kill(2), rt_sigqueueinfo(2)
This page is part of release 4.12 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
https://www.kernel.org/doc/man-pages/.
Linux 2017-03-13 TKILL(2)
Pages that refer to this page: clone(2), gettid(2), kill(2), ptrace(2), rt_sigqueueinfo(2), sigaction(2), syscalls(2), raise(3), nptl(7), signal(7)