Name

sys_tgkill — send signal to one specific thread

Synopsis

long sys_tgkill (int  tgid,
 int  pid,
 int  sig);

Arguments

tgid

the thread group ID of the thread

pid

the PID of the thread

sig

signal to be sent

Description

This syscall also checks the tgid and returns -ESRCH even if the PID exists but it's not belonging to the target process anymore. This method solves the problem of threads exiting and PIDs getting reused.