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.Dd May 5, 2020 .Dt THR_kill 2 .Os .Sh NAME .Nm thr_kill .Nd send signal to thread .Sh LIBRARY .Lb libc .Sh SYNOPSIS n sys/thr.h .Ft int .Fn thr_kill "long id" "int sig" .Ft int .Fn thr_kill2 "pid_t pid" "long id" "int sig" .Sh DESCRIPTION The .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.
p 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.
p 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.
p The signal is delivered with .Dv siginfo .Dv si_code set to .Dv SI_LWP . .Sh RETURN VALUES If successful, .Fn thr_kill and .Fn thr_kill2 will return zero, otherwise -1 is returned, and .Va errno is set to indicate the error. .Sh ERRORS The .Fn thr_kill and .Fn thr_kill2 operations return the following errors: l -tag -width Er t Bq Er EINVAL The .Fa sig argument is not zero and does not specify valid signal. t Bq Er ESRCH The specified process or thread was not found. .El
p Additionally, the .Fn thr_kill2 may return the following errors: l -tag -width Er t Bq Er EPERM The current process does not have sufficient privilege to check existence or send a signal to the specified process. .El .Sh SEE ALSO .Xr kill 2 , .Xr thr_exit 2 , .Xr thr_new 2 , .Xr thr_self 2 , .Xr thr_set_name 2 , .Xr _umtx_op 2 , .Xr pthread_kill 3 , .Xr signal 3 .Sh STANDARDS The .Fn thr_kill and .Fn thr_kill2 system calls are non-standard and are used by the .Lb libthr to implement .St -p1003.1-2001 .Xr pthread 3 functionality. .Sh HISTORY The .Fn thr_kill and .Fn thr_kill2 system calls first appeared in .Fx 5.2 .