4.4BSD/usr/share/man/cat2/killpg.0

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KILLPG(2)                   BSD Programmer's Manual                  KILLPG(2)

NNAAMMEE
     kkiillllppgg - send signal to a process group

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssiiggnnaall..hh>>

     _i_n_t
     kkiillllppgg(_p_i_d___t _p_g_r_p, _i_n_t _s_i_g);

DDEESSCCRRIIPPTTIIOONN
     KKiillllppgg() sends the signal _s_i_g to the process group _p_g_r_p. See sigaction(2)
     for a list of signals.  If _p_g_r_p is 0, kkiillllppgg() sends the signal to the
     sending process's process group.

     The sending process and members of the process group must have the same
     effective user ID, or the sender must be the super-user.  As a single
     special case the continue signal SIGCONT may be sent to any process that
     is a descendant of the current process.

RREETTUURRNN VVAALLUUEESS
     Upon successful completion, a value of 0 is returned.  Otherwise, a value
     of -1 is returned and the global variable _e_r_r_n_o is set to indicate the
     error.

EERRRROORRSS
     KKiillllppgg() will fail and no signal will be sent if:

     [EINVAL]      _S_i_g is not a valid signal number.

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

     [ESRCH]       The process group was given as 0 but the sending process
                   does not have a process group.

     [EPERM]       The sending process is not the super-user and one or more
                   of the target processes has an effective user ID different
                   from that of the sending process.

SSEEEE AALLSSOO
     kill(2),  getpgrp(2),  sigaction(2)

HHIISSTTOORRYY
     The kkiillllppgg function call appeared in 4.0BSD.

4th Berkeley Distribution        June 2, 1993                                1