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BSD 2.11 - man page for killpg (bsd section 2)

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KILLPG(2)										KILLPG(2)

       killpg - send signal to a process group

       killpg(pgrp, sig)
       int pgrp, sig;

       Killpg  sends  the signal sig to the process group pgrp.  See sigvec(2) for a list of sig-

       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 SIG-
       CONT may be sent to any process that is a descendant of the current process.

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

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

       [EINVAL]       Sig is not a valid signal number.

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

       [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

       kill(2), getpgrp(2), sigvec(2)

4th Berkeley Distribution		   May 14, 1986 				KILLPG(2)
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