54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
#include <stdio.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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/*
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*
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* This code is to be used in miniroot instead of using
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* netstat in the mrnetrc script.
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*
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* The problem with using netstat is that is uses NLIST
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* but it is possible that the kernel has not been
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* placed on the /swap filesystem yet. Thus causing
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* netstat to fail and print "/unix no namelist" error message.
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*
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* The script that calls this routine either expects success (0)
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* or failure (1). This is the reason why the if a system call
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* errors the return value is "-1".
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*
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*/
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main()
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{
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int s, n;
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char buf[BUFSIZ];
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struct ifconf ifc;
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struct ifreq ifreq, *ifr;
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if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
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return(-1);
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ifc.ifc_len = sizeof (buf);
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ifc.ifc_buf = buf;
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if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0)
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return(-1);
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ifr = ifc.ifc_req;
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for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++) {
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if (strncmp(ifr->ifr_name,"lo0",3) != 0) {
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ifreq = *ifr;
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if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0)
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return(-1);
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if ((ifreq.ifr_flags & (IFF_UP|IFF_RUNNING))
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== (IFF_UP|IFF_RUNNING))
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return(0);
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}
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}
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/*
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* At this point the network is not up and running ....
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*/
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return (1);
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}
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