Name

SYSCALL_DEFINE3 — send signal to one specific thread

Synopsis

SYSCALL_DEFINE3 ( tgkill, pid_t, tgid, pid_t, pid, int, sig);

Arguments

tgkill

pid_t

tgid

the thread group ID of the thread

pid_t

pid

the PID of the thread

int

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.