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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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tkill(2) System Calls Manual tkill(2)
tkill, tgkill - send a signal to a thread
Standard C library (libc, -lc)
#include <signal.h> /* Definition of SIG* constants */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
[[deprecated]] int syscall(SYS_tkill, pid_t tid, int sig);
#include <signal.h>
int tgkill(pid_t tgid, pid_t tid, int sig);
Note: glibc provides no wrapper for tkill(), necessitating the
use of syscall(2).
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 to indicate the error.
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.
Linux.
tkill()
Linux 2.4.19 / 2.5.4.
tgkill()
Linux 2.5.75, glibc 2.30.
See the description of CLONE_THREAD in clone(2) for an
explanation of thread groups.
clone(2), gettid(2), kill(2), rt_sigqueueinfo(2)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 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)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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