NAME

       killpg - send signal to a process group

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <signal.h>

       int killpg(int pgrp, int sig);

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

       killpg():
           _XOPEN_SOURCE >= 500
               || /* Since glibc 2.19: */ _DEFAULT_SOURCE
               || /* glibc <= 2.19: */ _BSD_SOURCE

DESCRIPTION

       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 the permissions required to send a signal to another process, see kill(2).

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set to indicate the error.

ERRORS

       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.   For  the
              required permissions, see kill(2).

       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.

VERSIONS

       There  are  various  differences  between  the  permission checking in BSD-type systems and System V-type
       systems.  See the POSIX rationale for kill(3p).  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 processes.

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

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001, SVr4, 4.4BSD (first appeared in 4BSD).

SEE ALSO

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