tree 2b47afbe0de749868b8f7aecba53fc7d2be17a3e
parent 608e55921770bbae1609135aa0c351238f57fc5f
author Laurent Vivier <laurent@vivier.eu> 1301436732 +0200
committer Riku Voipio <riku.voipio@iki.fi> 1303802140 +0300

linux-user: convert ioctl(SIOCGIFCONF, ...) result.

The result needs to be converted as it is stored in an array of struct
ifreq and sizeof(struct ifreq) differs according to target and host
alignment rules.

This patch allows to execute correctly the following program on arm
and m68k:

 #include <stdio.h>
 #include <sys/ioctl.h>
 #include <net/if.h>
 #include <alloca.h>
 #include <string.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>

int main(void)
{
    int s, ret;
    struct ifconf ifc;
    int i;

    memset( &ifc, 0, sizeof( struct ifconf ) );
    ifc.ifc_len = 8 * sizeof(struct ifreq);
    ifc.ifc_buf = alloca(ifc.ifc_len);

    s = socket( AF_INET, SOCK_DGRAM, 0 );
    if (s < 0) {
        perror("Cannot open socket");
        return 1;
    }
    ret = ioctl( s, SIOCGIFCONF, &ifc );
    if (s < 0) {
        perror("ioctl() failed");
        return 1;
    }

    for (i = 0; i < ifc.ifc_len / sizeof(struct ifreq) ; i ++) {
        struct sockaddr_in *s;
        s = (struct sockaddr_in*)&ifc.ifc_req[i].ifr_addr;
        printf("%s\n", ifc.ifc_req[i].ifr_name);
        printf("%s\n", inet_ntoa(s->sin_addr));
    }
}

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>