killpg(3p) [posix man page]

KILLPG(3P)						     POSIX Programmer's Manual							KILLPG(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       killpg -- send a signal to a process group

SYNOPSIS

       #include <signal.h>

       int killpg(pid_t pgrp, int sig);

DESCRIPTION

       The killpg() function shall send the signal specified by sig to the process group specified by pgrp.

       If pgrp is greater than 1, killpg(pgrp, sig) shall be equivalent to kill(-pgrp, sig). If pgrp is less than or equal to 1, the  behavior	of
       killpg() is undefined.

RETURN VALUE

       Refer to kill().

ERRORS

       Refer to kill().

       The following sections are informative.

EXAMPLES

   Sending a Signal to All Other Members of a Process Group
       The  following  example shows how the calling process could send a signal to all other members of its process group. To prevent itself from
       receiving the signal it first makes itself immune to the signal by ignoring it.

	   #include <signal.h>
	   #include <unistd.h>
	   ...
	       if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
		   /* Handle error */;

	       if (killpg(getpgrp(), SIGUSR1) == -1)
		   /* Handle error */;"

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       getpgid(), getpid(), kill(), raise()

       The Base Definitions volume of POSIX.1-2008, <signal.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy  --	Portable  Operating  System  Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C) 2013 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
       event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013								KILLPG(3P)

Check Out this Related Man Page

KILLPG(3)						     Linux Programmer's Manual							 KILLPG(3)

NAME

       killpg - send signal to a process group

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 versions <= 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 appropriately.

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.

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD (killpg() first appeared in 4BSD).

NOTES

       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 tar-
       get processes.

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

SEE ALSO

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

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15								 KILLPG(3)

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killpg(3p) [posix man page]

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