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wait4 - Wait for an arbitrary process
wait4 allows its user to wait for the termination of an arbitrary
process specified by its PID. It works as the standard shell command
wait, but is not limited to waiting to the child processes of the
On GNU/Linux systems where the Netlink interface is available, wait4 is
directly informed by the kernel as soon as the target process is
terminated, and the exit code of that process is used as the exit code
of wait4 itself. On other systems, wait4 acts by polling the /proc
filesystem every second; in that case, the exit code is always 0, as
there is no way to retrieve the exit code of the target process.
When using Netlink, wait4 must be run as setuid root, as only a
privileged process can bind to an AF_NETLINK address; root privileges
are dropped immediately after the bind(2) call.
wait4 is distributed under the terms of the GNU General Public License,
version 3 or higher.