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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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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 is no glibc wrapper for tkill(); 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.
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.
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.
tkill() is supported since Linux 2.4.19 / 2.5.4. tgkill() was
added in Linux 2.5.75.
Library support for tgkill() was added to glibc in version 2.30.
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 a wrapper for tkill(); call it using
syscall(2). Before glibc 2.30, there was also no wrapper
function for tgkill().
clone(2), gettid(2), kill(2), rt_sigqueueinfo(2)
This page is part of release 5.10 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 2019-08-02 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)
Copyright and license for this manual page
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