...within a specific process. (This is the system call used to implement pthread_kill (3).) sigqueue (3) Sends a real-time signal with accompanying data to a specified process. Wai…...e attempts to block these two signals. • The sigaction (2), pthread_kill (3), and pthread_sigqueue (3) interfaces fail with the error EINVAL (indicating an invalid signal number…...POSIX.1-2008 TC2; see notes below signal (2) sigpause (3) sigpending (2) sigprocmask (2) sigqueue (2) sigset (3) sigsuspend (2) sleep (3) sockatmark (3) Added in POSIX.1-2001 TC…...by the call, for example: kill (2), ptrace (2), setpriority (2), setpgid (2), setsid (2), sigqueue (3), and waitpid (2). A process's PID is preserved across an execve (2). Paren…...gaction (2). Conforming to : POSIX.1-2001 and later. See also : pidfd_send_signal (2), rt_sigqueueinfo (2), sigaction (2), sigwaitinfo (2), psiginfo (3) sigset_t Include : <sign…..._SC_REALTIME_SIGNALS Realtime signals are supported. The following functions are present: sigqueue () sigtimedwait () sigwaitinfo () --- - _POSIX_REGEXP - _SC_REGEXP If this opt…...ate (3), pthread_setcanceltype (3), pthread_setspecific (3), pthread_sigmask (3), pthread_sigqueue (3), and pthread_testcancel (3)