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Manual for killpg - man 2 killpg

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

       killpg(2,3) - send(2,n) signal(2,7) to a process group

       #include <signal.h>

       int killpg(2,3)(int pgrp, int sig);

       Killpg  sends  the signal(2,7) sig to the process group pgrp.  See signal(2,7)(7)
       for a list of signals.  If pgrp is 0, killpg(2,3) sends the  signal(2,7)  to  the
       sending process's process group.

       (POSIX says: If pgrp is less(1,3) than or equal to 1, the behaviour is unde-

       For a process to have permission to send(2,n) a signal(2,7)  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(8,n), -1 is returned, and  errno  is
       set(7,n,1 builtins) appropriately.

       EINVAL Sig is not a valid signal(2,7) number.

       EPERM  The  process  does not have permission to send(2,n) the signal(2,7) to any
              of the target processes.

       ESRCH  No process can be found in(1,8) the process group specified by  pgrp.

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

       There are various differences between the permission checking  in(1,8)  BSD-
       type systems and SYSV-type systems. See the POSIX rationale for kill(1,2,1 builtins)().
       A difference not mentioned by POSIX concerns the  return  value  EPERM:
       BSD  documents  that no signal(2,7) is sent and EPERM returned when the per-
       mission check failed for at least one target process, while POSIX docu-
       ments  EPERM  only when the permission check failed for all target pro-

       SVr4, 4.4BSD (The killpg(2,3) function call first appeared in(1,8) 4.0BSD).

       getpgrp(2), kill(1,2,1 builtins)(2), signal(2,7)(2), capabilities(7)

BSD Man Page                      2004-06-21                         KILLPG(2)

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