Copyright (c) 2016 The FreeBSD Foundation, Inc. All rights reserved. This documentation was written by Konstantin Belousov <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form...
NAMEthr_kill - send signal to thread
SYNOPSISIn sys/thr.h Ft int Fn thr_kill long id int sig Ft int Fn thr_kill2 pid_t pid long id int sig
DESCRIPTIONThe Fn thr_kill and Fn thr_kill2 system calls allow sending a signal, specified by the Fa sig argument, to some threads in a process. For the Fn thr_kill function, signalled threads are always limited to the current process. For the Fn thr_kill2 function, the Fa pid argument specifies the process with threads to be signalled.
The Fa id argument specifies which threads get the signal. If Fa id is equal to -1, all threads in the specified process are signalled. Otherwise, only the thread with the thread identifier equal to the argument is signalled.
The Fa sig argument defines the delivered signal. It must be a valid signal number or zero. In the latter case no signal is actually sent, and the call is used to verify the liveness of the thread.
The signal is delivered with siginfo si_code set to SI_LWP
RETURN VALUESIf successful, Fn thr_kill and Fn thr_kill2 will return zero, otherwise -1 is returned, and errno is set to indicate the error.
ERRORSThe Fn thr_kill and Fn thr_kill2 operations return the following errors:
- Bq Er EINVAL
- The Fa sig argument is not zero and does not specify valid signal.
- Bq Er ESRCH
- The specified process or thread was not found.
Additionally, the Fn thr_kill2 may return the following errors:
- Bq Er EPERM
- The current process does not have sufficient privilege to check existence or send a signal to the specified process.