Bug#733452: Minimal code for systemd protocol

[Nikolaus Rath <Nikolaus@rath.org>]

Hello,

It's already been mentioned elsewhere, but I think it should be included in this bug for reference. The minimum code to support systemd style readyness notification is (from https://plus.google.com/+LennartPoetteringTheOneAndOnly/posts/37AWJLE3XcJ):


    static void notify(const char *data) {
            const char *e;
         
            e = getenv("NOTIFY_SOCKET");
            if (e) {
                    struct sockaddr_un un = { .sun_family = AF_UNIX };
                    int fd;
                    strncpy(un.sun_path, e, sizeof(un.sun_path));
                    if (un.sun_path[0] == '@')
                            un.sun_path[0] = 0;
                    fd = socket(AF_UNIX, SOCK_DGRAM, 0);
                    if (fd < 0)
                            return;
                    sendto(fd, data, strlen(data), MSG_NOSIGNAL, (struct sockaddr*) &un, offsetof(un.sun_path) + strlen(e));
                    close(fd);
           }
    }



Best,
Nikolaus
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