int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) {
struct udev *udev;
struct udev_list_entry *first = NULL;
struct udev_enumerate *e;
int r;
if (n_columns <= 0)
n_columns = columns();
if (!prefix)
prefix = "";
if (isempty(seat))
seat = "seat0";
udev = udev_new();
if (!udev)
return -ENOMEM;
e = udev_enumerate_new(udev);
if (!e) {
r = -ENOMEM;
goto finish;
}
if (!streq(seat, "seat0"))
r = udev_enumerate_add_match_tag(e, seat);
else
r = udev_enumerate_add_match_tag(e, "seat");
if (r < 0)
goto finish;
r = udev_enumerate_scan_devices(e);
if (r < 0)
goto finish;
first = udev_enumerate_get_list_entry(e);
if (first)
show_sysfs_one(udev, seat, &first, "/", prefix, n_columns);
finish:
if (e)
udev_enumerate_unref(e);
if (udev)
udev_unref(udev);
return r;
}
int show_sysfs(const char *seat, const char *prefix, unsigned n_columns) {
_cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
_cleanup_udev_unref_ struct udev *udev = NULL;
struct udev_list_entry *first = NULL;
int r;
if (n_columns <= 0)
n_columns = columns();
if (!prefix)
prefix = "";
if (isempty(seat))
seat = "seat0";
udev = udev_new();
if (!udev)
return -ENOMEM;
e = udev_enumerate_new(udev);
if (!e)
return -ENOMEM;
if (!streq(seat, "seat0"))
r = udev_enumerate_add_match_tag(e, seat);
else
r = udev_enumerate_add_match_tag(e, "seat");
if (r < 0)
return r;
r = udev_enumerate_add_match_is_initialized(e);
if (r < 0)
return r;
r = udev_enumerate_scan_devices(e);
if (r < 0)
return r;
first = udev_enumerate_get_list_entry(e);
if (first)
show_sysfs_one(udev, seat, &first, "/", prefix, n_columns);
else
printf("%s%s%s\n", prefix, draw_special_char(DRAW_TREE_RIGHT), "(none)");
return r;
}
static int show_sysfs_one(
struct udev *udev,
const char *seat,
struct udev_list_entry **item,
const char *sub,
const char *prefix,
unsigned n_columns) {
assert(udev);
assert(seat);
assert(item);
assert(prefix);
while (*item) {
struct udev_list_entry *next, *lookahead;
struct udev_device *d;
const char *sn, *name, *sysfs, *subsystem, *sysname;
char *l, *k;
bool is_master;
sysfs = udev_list_entry_get_name(*item);
if (!path_startswith(sysfs, sub))
return 0;
d = udev_device_new_from_syspath(udev, sysfs);
if (!d) {
*item = udev_list_entry_get_next(*item);
continue;
}
sn = udev_device_get_property_value(d, "ID_SEAT");
if (isempty(sn))
sn = "seat0";
/* Explicitly also check for tag 'seat' here */
if (!streq(seat, sn) || !udev_device_has_tag(d, "seat")) {
udev_device_unref(d);
*item = udev_list_entry_get_next(*item);
continue;
}
is_master = udev_device_has_tag(d, "seat-master");
name = udev_device_get_sysattr_value(d, "name");
if (!name)
name = udev_device_get_sysattr_value(d, "id");
subsystem = udev_device_get_subsystem(d);
sysname = udev_device_get_sysname(d);
/* Look if there's more coming after this */
lookahead = next = udev_list_entry_get_next(*item);
while (lookahead) {
const char *lookahead_sysfs;
lookahead_sysfs = udev_list_entry_get_name(lookahead);
if (path_startswith(lookahead_sysfs, sub) &&
!path_startswith(lookahead_sysfs, sysfs)) {
struct udev_device *lookahead_d;
lookahead_d = udev_device_new_from_syspath(udev, lookahead_sysfs);
if (lookahead_d) {
const char *lookahead_sn;
bool found;
lookahead_sn = udev_device_get_property_value(d, "ID_SEAT");
if (isempty(lookahead_sn))
lookahead_sn = "seat0";
found = streq(seat, lookahead_sn) && udev_device_has_tag(lookahead_d, "seat");
udev_device_unref(lookahead_d);
if (found)
break;
}
}
lookahead = udev_list_entry_get_next(lookahead);
}
k = ellipsize(sysfs, n_columns, 20);
printf("%s%s%s\n", prefix, draw_special_char(lookahead ? DRAW_TREE_BRANCH : DRAW_TREE_RIGHT),
k ? k : sysfs);
free(k);
if (asprintf(&l,
"%s%s:%s%s%s%s",
is_master ? "[MASTER] " : "",
subsystem, sysname,
name ? " \"" : "", name ? name : "", name ? "\"" : "") < 0) {
udev_device_unref(d);
return -ENOMEM;
}
k = ellipsize(l, n_columns, 70);
printf("%s%s%s\n", prefix, lookahead ? draw_special_char(DRAW_TREE_VERT) : " ",
k ? k : l);
free(k);
free(l);
*item = next;
if (*item) {
char *p;
p = strappend(prefix, lookahead ? draw_special_char(DRAW_TREE_VERT) : " ");
show_sysfs_one(udev, seat, item, sysfs, p ? p : prefix, n_columns - 2);
free(p);
}
udev_device_unref(d);
}
return 0;
}