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       killpg - send signal to a process group


       #include <signal.h>

       int killpg(int pgrp, int sig);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       killpg(): _BSD_SOURCE || _XOPEN_SOURCE >= 500


       killpg() sends the signal sig to the process group pgrp.  See signal(7)
       for a list of signals.

       If pgrp is 0, killpg()  sends  the  signal  to  the  calling  process’s
       process  group.   (POSIX  says: If pgrp is less than or equal to 1, the
       behavior is undefined.)

       For a process to have permission to send a signal  it  must  either  be
       privileged  (under Linux: have the CAP_KILL capability), or the real or
       effective user ID of the sending process must equal the real  or  saved
       set-user-ID  of the target process.  In the case of SIGCONT it suffices
       when the sending and receiving processes belong to the same session.


       On success, zero is returned.  On error, -1 is returned, and  errno  is
       set appropriately.


       EINVAL Sig is not a valid signal number.

       EPERM  The  process  does not have permission to send the signal to any
              of the target processes.

       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.


       SVr4, 4.4BSD (the killpg()  function  call  first  appeared  in  4BSD),


       There  are  various differences between the permission checking in BSD-
       type systems and System V-type systems.  See the  POSIX  rationale  for
       kill().   A difference not mentioned by POSIX concerns the return value
       EPERM: BSD documents that no signal is sent and EPERM returned when the
       permission  check  failed  for at least one target process, while POSIX
       documents EPERM only when the permission check failed  for  all  target

       On  Linux, killpg() is implemented as a library function that makes the
       call kill(-pgrp, sig).


       getpgrp(2), kill(2), signal(2), capabilities(7), credentials(7)


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