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NAMEkillpg - send signal to a process group
int killpg(int pgrp, int sig);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
- _BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
DESCRIPTIONkillpg() sends the signal sig to the process group pgrp. See signal(7) for a list of signals.
If pgrp is 0, killpg() sends the signal to the calling process's process group. (POSIX says: If pgrp is less than or equal to 1, the behavior is undefined.)
For a process to have permission to send a signal it must either be privileged (under Linux: have the CAP_KILL capability), or the real or effective user ID of the sending process must equal the real or saved set-user-ID of the target process. In the case of SIGCONT it suffices when the sending and receiving processes belong to the same session.
RETURN VALUEOn success, zero is returned. On error, -1 is returned, and errno is set appropriately.
- sig is not a valid signal number.
- The process does not have permission to send the signal to any of the target processes.
- 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.