---
name: "killpg"
section: "2freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "12.2-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/killpg/2freebsd"
---

# killpg(2freebsd)

send signal to a process group

## NAME

**killpg** – send signal to a process group

## LIBRARY

Standard C Library (libc, -lc)

## SYNOPSIS

**#include \<sys/types.h\>**

**#include \<signal.h\>**

*int*\

**killpg**(*pid\_t pgrp*, *int sig*);

## DESCRIPTION

The **killpg**() function sends the signal *sig* to the process group *pgrp*. See [sigaction(2)](/sigaction/2.md) for a list of signals. If *pgrp* is 0, **killpg**() sends the signal to the sending process's process group.

The sending process must be able to **kill**() at least one process in the receiving process group.

## RETURN VALUES

The **killpg()** function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error.

## ERRORS

The **killpg**() function will fail and no signal will be sent if:

- \[EINVAL\]

  The *sig* argument is not a valid signal number.

- \[ESRCH\]

  No process can be found in the process group specified by *pgrp*.

- \[EPERM\]

  **kill**() returns EPERM for all processes in the process group.

## SEE ALSO

[getpgrp(2)](/getpgrp/2.md), [kill(2)](/kill/2.md), [sigaction(2)](/sigaction/2.md)

## HISTORY

The **killpg**() function appeared in 4.0BSD.