Name
tkill, tgkill — send a signal to a single
process
Synopsis
int
tkill( |
int |
tid, |
| |
int |
sig); |
int
tgkill( |
int |
tgid, |
| |
int |
tid, |
| |
int |
sig); |
DESCRIPTION
The tkill() system call is
analogous to kill(2), except when the
specified process is part of a thread group (created by
specifying the CLONE_THREAD flag in the call to clone). Since
all the processes in a thread group have the same PID, they
cannot be individually signalled with kill(2). With tkill(), however, one can address each
process by its unique TID.
The tgkill() call improves
on tkill() by allowing the
caller to specify the thread group ID of the thread to be
signalled, protecting against TID reuse. If the tgid is
specified as −1, tgkill()
degenerates into tkill().
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 TID 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
Glibc does not provide wrapper for these system calls;
call them using syscall(2).
SEE ALSO
gettid(2), kill(2)
Copyright 2003 Abhijit Menon-Sen <ams@wiw.org>
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2004-05-31, added tgkill, ahu, aeb
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