killpg(2)killpg(2)NAMEkillpg - Send a signal to a process group
SYNOPSIS
#include <signal.h>
int killpg(
pid_t process_grp,
int signal );
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 XSH standards, but may
be on other vendors' systems that conform to these standards.
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
killpg(): XSH4.2, XSH5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Specifies the process group. Specifies the signal. If the signal
parameter is a value of 0 (zero, the null signal), error checking is
performed but no signal is sent. This parameter can be used to check
the validity of the process parameter.
DESCRIPTION
The killpg() function sends the signal specified by the signal parame‐
ter 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
process must belong to the superuser. The continue signal, SIGCONT, is
a special case: it may be sent to any process that is a descendent of
the current process.
RETURN VALUES
Upon successful completion, the killpg() function returns a value of 0
(zero). Otherwise, a value of -1 is returned, and errno is set to indi‐
cate the error.
ERRORS
If any of the following conditions occurs, the killpg() function sets
errno to the corresponding value: The signal parameter is not a valid
signal number. 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. 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.
SEE ALSO
Functions: getpid(2), kill(2), setpgid(2), sigaction(2), sigvec(2),
raise(3)
Standards: standards(5)killpg(2)
