отправить сигнал группе процессов (send signal to a process group)
Имя (Name)
killpg - send signal to a process group
Синопсис (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
Описание (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).
Возвращаемое значение (Return value)
On success, zero is returned. On error, -1 is returned, and
errno is set to indicate the error.
Ошибки (Error)
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.
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD (killpg() first appeared
in 4BSD).
Примечание (Note)
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).
Смотри также (See also)
getpgrp(2), kill(2), signal(2), capabilities(7), credentials(7)
