X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=sources%2Fiflist.c;h=371714f1684173be5816e024556d3a250558747f;hp=6020b5282b97f8f3e40918f3ee0f481797f9c4ce;hb=b8a79028184003289dc1c92fdcfab416b130ce20;hpb=20d2dafe03f5ab376e6f5a5e8168d7016ccb55aa

diff --git a/sources/iflist.c b/sources/iflist.c
index 6020b52..371714f 100644
--- a/sources/iflist.c
+++ b/sources/iflist.c
@@ -85,19 +85,21 @@ int main(int argc, char *argv[])
 	printf("Wrong number of arguments %d\n", argc - optind);
         usage();
     }
-    iflist.ifc_len = sizeof(buffer);
-    iflist.ifc_buf = buffer;
-    
+    /* create a socket for the operation */
     sock = socket(PF_INET, SOCK_STREAM, 0);
     if (sock < 0) {
         perror("Socket creation error");
         return 1;
     }
+    /* init values for the ifcon structure and do SIOCGIFCONF */
+    iflist.ifc_len = sizeof(buffer);
+    iflist.ifc_buf = buffer;
     ret = ioctl(sock, SIOCGIFCONF, &iflist);
     if (ret < 0) {
 	perror("ioctl failed");
         return 1;
     }
+    /* check that we have all data */
     if (iflist.ifc_len == sizeof(buffer)) {
 	printf("Probable overflow, too many interfaces, cannot read\n");
 	return 1;
@@ -105,6 +107,7 @@ int main(int argc, char *argv[])
 	num = iflist.ifc_len/sizeof(struct ifreq);
 	printf("Found %i interfaces \n", num);
     }
+    /* loop on interface to write data */
     for (i=0; i < num; i++) {
 	address = (struct sockaddr_in *) &iflist.ifc_req[i].ifr_addr;
 	printf("Interface %s, address %s\n", iflist.ifc_req[i].ifr_name,