2.9BSD/usr/man/cat2/killpg.2j

KILLPG(2J)          UNIX Programmer's Manual           KILLPG(2J)

NAME
     killpg - send signal to a process or a process group

SYNOPSIS
     killpg(pgrp, sig)

     cc ... -ljobs

DESCRIPTION
     _K_i_l_l_p_g sends the signal _s_i_g to the specified process group.
     See _s_i_g_s_y_s(2) for a list of signals; see _i_n_t_r_o(3J) for an
     explanation of process groups.

     The sending process and members of the process group must
     have the same effective user ID, otherwise this call is res-
     tricted to the super-user.  As a single special case the
     continue signal SIGCONT may be sent to any process which is
     a descendant of the current process.  This allows a command
     interpreter such as _c_s_h(1) to restart set-user-id processes
     stopped from the keyboard with a stop signal.

     The calls

          killpg(0, sig)

     and

          kill(0, sig)

     have identical effects, sending the signal to all members of
     the invoker's process group (including the process itself).
     It is preferable to use the call involving _k_i_l_l in this
     case, as it is portable to other UNIX systems.

RETURN VALUE
     Upon successful completion, a value of 0 is returned.  Oth-
     erwise, a value of -1 is returned and _e_r_r_n_o is set to indi-
     cate the error.

ERRORS
     _K_i_l_l_p_g will fail and no signal will be sent if any of the
     following occur:

     [EINVAL]            _S_i_g is not a valid signal number.

     [ESRCH]             No process can be found corresponding to
                         the process group specified by _p_g_r_p.

SEE ALSO
     csh(1), kill(1), kill(2), signal(2), sigsys(2J), intro(3J)

Printed 7/30/83                                                 1

KILLPG(2J)          UNIX Programmer's Manual           KILLPG(2J)

ASSEMBLER (PDP-11)
     (kill =37.)
     (process number in r0)
     sys kill; -sig (negative signal number means killpg)

BUGS
     The job control facilities are not available in standard
     version 7 UNIX.  These facilities are still under develop-
     ment and may change in future releases of the system as
     better inter-process communication facilities and support
     for virtual terminals become available.  The options and
     specifications of this system call and even the call itself
     are thus subject to change.

Printed 7/30/83                                                 2