KILLPG Section: Linux Programmer's Manual (2) Updated: 23 July 2025 Index   NAME killpg - send signal to a process group   SYNOPSIS #include <signal.h> int killpg(int pgrp, int sig);   DESCRIPTION Killpg sends the signal sig to the process group pgrp. See 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 that is a descendant of the current process.   RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set appropriately.   ERRORS EINVAL Sig is not a valid signal number. 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. EPERM 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.   CONFORMING TO SVr4, 4.4BSD (The killpg function call first appeared in 4.0BSD).   SEE ALSO   Index NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO This document was created by using the manual pages. Time: 11:56:06 GMT, March 24, 2025