쉘 스크립트 등록

$ cat hotplugd.sh
#!/bin/sh
echo $*
echo $ACTION
echo $DEVPATH
echo $SUBSYSTEM
echo $SEQNUM
$
$ echo `pwd`/hotplugd.sh > /proc/sys/kernel/hotplug

#define NETLINK_KOBJECT_UEVENT (15)
 
int main(int argc, char **argv)
{
    int ret = EXIT_FAILURE;
    int ns = -1;
    struct sockaddr_nl sa;
    char buf[4096];
    struct iovec iov = { buf, sizeof(buf) };
    struct msghdr msg = { &sa, sizeof(sa), &iov, 1, NULL, 0, 0 };
    int len;
 
    memset (&sa, 0, sizeof(sa));
    sa.nl_family = AF_NETLINK;
    sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR;
 
    ns = socket(AF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
    if (ns < 0) {
        perror("socket()");
        goto sock_err;
    }
    if (bind(ns, (struct sockaddr*)&sa, sizeof(sa))) {
        perror("bind()");
        goto bind_err;
    }
 
    while (1) {
        len = recvmsg (ns, &msg, 0);
        if (len < 0) {
            perror("recvmsg()");
            break;
        }
 
        buf[4095] = 0;
        printf("%s\n", &buf[0]);
        fflush(stdout);
 
#if 0
        /* ... refer to 'man 7 netlink' */
        struct nlmsghdr *h;
        for (h = (struct nlmsghdr*)buf; NLMSG_OK(h, len);) {
            printf("nlmsg_len: %d\n", h->nlmsg_len);
            h = NLMSG_NEXT(h, len);
        }
#endif
    }
 
 bind_err:
    close(ns);
 
 sock_err:
    return ret;
}