> We use sysvinit to build our system. When I input "poweroff" command, > sometimes the system has no response. > > I did some investigation, and found that in the function check_init_fifo() of > init, the line: > > n = read(pipe_fd, &request, sizeof(request)); > > sometimes it return -1, and the error code is EAGAIN. > > I modified the init code, and let it retry for 5 times when the error code is > EAGAIN, but not work well. > > Does anyone know why sometimes read /dev/initctl return -1? How to resolve > this? Thanks. >
According to the read() manual page it seems likely the read attempt would block which makes me wonder if the filesystem is not responding or may be unmounted already? I'm curious as to which version of sysvinit you're using. On modern versions the control pipe is located at /run/initcrl rather than /dev/initctl. Do you get the same error code when running the latest version of sysvinit? - Jesse
