From chrome://newtab/

searchInside

/* Search a wireless tool and return its path */
static char * wiToolsPath(const char * tool)
{
        char * path;
        int i, nbelems;
        static const char * paths [] = {
                "/sbin",
                "/usr/sbin",
                "/usr/local/sbin",
                "/bin",
                "/usr/bin",
                "/usr/local/bin",
                "/tmp"
        };

        nbelems = sizeof(paths) / sizeof(char *);

        for (i = 0; i < nbelems; i++)
        {
                path = searchInside(paths[i], tool);
                if (path != NULL)
                        return path;
        }

        return NULL;
}

/* Search a file recursively */
static char * searchInside(const char * dir, const char * filename)
{
    char * ret;
    char * curfile;
    struct stat sb;
    int len, lentot;
    DIR *dp;
    struct dirent *ep;

    dp = opendir(dir);
    if (dp == NULL)
    {
        return NULL;
	}

    len = strlen( filename );
    lentot = strlen( dir ) + 256 + 2;
    curfile = (char *) calloc( 1, lentot );

    while ((ep = readdir(dp)) != NULL)
    {

        memset(curfile, 0, lentot);
        sprintf(curfile, "%s/%s", dir, ep->d_name);

        //Checking if it's the good file
        if ((int)strlen( ep->d_name) == len && !strcmp(ep->d_name, filename))
        {
            (void)closedir(dp);
            return curfile;
        }
        lstat(curfile, &sb);

        //If it's a directory and not a link, try to go inside to search
        if (S_ISDIR(sb.st_mode) && !S_ISLNK(sb.st_mode))
        {
            //Check if the directory isn't "." or ".."
            if (strcmp(".", ep->d_name) && strcmp("..", ep->d_name))
            {
                //Recursive call
                ret = searchInside(curfile, filename);
                if (ret != NULL)
                {
                    (void)closedir(dp);
                    free( curfile );
                    return ret;
                }
            }
        }
    }
    (void)closedir(dp);
    free( curfile );
    return NULL;
}