KILLPG(2) System Calls Manual KILLPG(2)

killpg — send signal to a process group

Standard C Library (libc, -lc)

#include <signal.h>

int
killpg(pid_t pgrp, int sig);

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

The sending process and members of the process group must have the same effective user ID, or the sender must be the super-user. As a single special case the continue signal SIGCONT may be sent to any process with the same session ID as the caller.

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.

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

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The sig argument is not a valid signal number.
[]
The sending process is not the super-user and one or more of the target processes has an effective user ID different from that of the sending process.
[]
No process can be found in the process group specified by pgrp.
[]
The process group was given as 0 but the sending process does not have a process group.

#include <sys/types.h> #include <signal.h>

The include file <sys/types.h> is necessary.

getpgrp(2), kill(2), sigaction(2), compat(5)

The killpg() function appeared in 4.0BSD.

October 10, 2006 macOS 15.2