killpg - Sends a signal to a process group
Standard C Library (libc)
Application developers may want to specify an #include statement for
<<sys/types.h>> before the one for <<signal.h>> if programs are being developed
for multiple platforms. The additional #include statement is not required
on Tru64 UNIX systems or by ISO or X/Open standards, but may be required on
other vendors' systems that conform to these standards.
Interfaces documented on this reference page conform to industry standards
Refer to the standards(5) reference page for more information about indus-
try standards and associated tags.
Specifies the process group.
signal Specifies the signal. If the signal parameter is a value of 0
(zero, the null signal), error checking is performed but no sig-
nal is sent. This parameter can be used to check the validity of
the process parameter.
The killpg() function sends the signal specified by the signal parameter to
the group of processes specified by the process_grp parameter.
The process sending the signal must have the same effective user ID or
saved set-user-ID as the members of the process group, or the sending pro-
cess must belong to the superuser. The continue signal, SIGCONT, is a spe-
cial case: it may be sent to any process that is a descendent of the
Upon successful completion, the killpg() function returns a value of 0
(zero). Otherwise, a value of -1 is returned, and errno is set to indicate
If any of the following conditions occurs, the killpg() function sets errno
to the corresponding value:
[EINVAL] The signal parameter is not a valid signal number.
[ESRCH] No process can be found in process_grp.
[Tru64 UNIX] The process group was given as 0 (zero), but the
sending process does not have a process group.
[EPERM] The real or saved user ID does not match the real or effective
user ID of the receiving process, the calling process does not
have the appropriate privilege, and the process is not sending a
SIGCONT signal to one of its session's processes.
Functions: getpid(2), kill(2), setpgid(2), sigaction(2), sigvec(2),