Date: Mon, 21 Jul 2008 21:30:39 +0000 From: Jens Rehsack <rehsack@web.de> To: Brooks Davis <brooks@freebsd.org> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: lo0 not in ioctl( SIOCGIFCONF ) Message-ID: <4884FFFF.9090908@web.de> In-Reply-To: <20080721204820.GE1699@lor.one-eyed-alien.net> References: <4884F401.4050103@web.de> <20080721204820.GE1699@lor.one-eyed-alien.net>
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Brooks Davis wrote: >> Hi, >> >> maybe this question is better asked in this list ... >> >> I was searching why ports/net/p5-Net-Interface was not working as >> expected and found some reasons. Most of them I can answer by implementing >> some test code as attached, but now I'm wondering why em0 is shown twice >> and lo0 is not included. >> The same situation on another machine .. > > The attachment didn't make it through. > > -- Brooks Copy&Paste starts here ... #include <stdio.h> #include <stdlib.h> #include <sys/socket.h> #include <net/if.h> #include <errno.h> #include <strings.h> #include <sys/ioctl.h> #include <ifaddrs.h> #ifndef _SIZEOF_ADDR_IFREQ #define _SIZEOF_ADDR_IFREQ(ifr) \ ((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \ (sizeof(struct ifreq) - sizeof(struct sockaddr) + \ (ifr).ifr_addr.sa_len) : sizeof(struct ifreq)) #endif int main() { struct ifconf ifc; struct ifreq *ifr, *lifr; int fd; unsigned int n; fd = socket( AF_INET, SOCK_STREAM, 0 ); bzero(&ifc, sizeof(ifc)); n = 3; ifr = calloc( ifc.ifc_len, sizeof(*ifr) ); do { n *= 2; ifr = realloc( ifr, sizeof(*ifr) * n ); bzero( ifr, sizeof(*ifr) * n ); ifc.ifc_req = ifr; ifc.ifc_len = n * sizeof(*ifr); } while( ( ioctl( fd, SIOCGIFCONF, &ifc ) == -1 ) || ( ifc.ifc_len == n * sizeof(*ifr)) ); lifr = (struct ifreq *)&ifc.ifc_buf[ifc.ifc_len]; while (ifr < lifr) { printf( "%s\n", ifr->ifr_name ); ifr = (struct ifreq *)(((char *)ifr) + _SIZEOF_ADDR_IFREQ(*ifr)); } return 0; }
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