summaryrefslogtreecommitdiffstats
path: root/misc-utils/lsfd-cdev.c
diff options
context:
space:
mode:
Diffstat (limited to 'misc-utils/lsfd-cdev.c')
-rw-r--r--misc-utils/lsfd-cdev.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/misc-utils/lsfd-cdev.c b/misc-utils/lsfd-cdev.c
new file mode 100644
index 0000000..4e35f15
--- /dev/null
+++ b/misc-utils/lsfd-cdev.c
@@ -0,0 +1,178 @@
+/*
+ * lsfd-cdev.c - handle associations opening character devices
+ *
+ * Copyright (C) 2021 Red Hat, Inc. All rights reserved.
+ * Written by Masatake YAMATO <yamato@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "xalloc.h"
+#include "nls.h"
+#include "libsmartcols.h"
+
+#include "lsfd.h"
+
+static struct list_head miscdevs;
+
+struct miscdev {
+ struct list_head miscdevs;
+ unsigned long minor;
+ char *name;
+};
+
+static bool cdev_fill_column(struct proc *proc __attribute__((__unused__)),
+ struct file *file __attribute__((__unused__)),
+ struct libscols_line *ln,
+ int column_id,
+ size_t column_index)
+{
+ char *str = NULL;
+ const char *devdrv;
+ const char *miscdev;
+
+ switch(column_id) {
+ case COL_TYPE:
+ if (scols_line_set_data(ln, column_index, "CHR"))
+ err(EXIT_FAILURE, _("failed to add output data"));
+ return true;
+ case COL_MISCDEV:
+ devdrv = get_chrdrv(major(file->stat.st_rdev));
+ if (devdrv && strcmp(devdrv, "misc") == 0) {
+ miscdev = get_miscdev(minor(file->stat.st_rdev));
+ if (miscdev)
+ str = xstrdup(miscdev);
+ else
+ xasprintf(&str, "%u",
+ minor(file->stat.st_rdev));
+ break;
+ }
+ return true;
+ case COL_DEVTYPE:
+ if (scols_line_set_data(ln, column_index,
+ "char"))
+ err(EXIT_FAILURE, _("failed to add output data"));
+ return true;
+ case COL_CHRDRV:
+ devdrv = get_chrdrv(major(file->stat.st_rdev));
+ if (devdrv)
+ str = xstrdup(devdrv);
+ else
+ xasprintf(&str, "%u",
+ major(file->stat.st_rdev));
+ break;
+ case COL_SOURCE:
+ devdrv = get_chrdrv(major(file->stat.st_rdev));
+ miscdev = NULL;
+ if (devdrv && strcmp(devdrv, "misc") == 0)
+ miscdev = get_miscdev(minor(file->stat.st_rdev));
+ if (devdrv) {
+ if (miscdev) {
+ xasprintf(&str, "misc:%s", miscdev);
+ } else {
+ xasprintf(&str, "%s:%u", devdrv,
+ minor(file->stat.st_rdev));
+ }
+ break;
+ }
+ /* FALL THROUGH */
+ case COL_MAJMIN:
+ xasprintf(&str, "%u:%u",
+ major(file->stat.st_rdev),
+ minor(file->stat.st_rdev));
+ break;
+ default:
+ return false;
+ }
+
+ if (!str)
+ err(EXIT_FAILURE, _("failed to add output data"));
+ if (scols_line_refer_data(ln, column_index, str))
+ err(EXIT_FAILURE, _("failed to add output data"));
+ return true;
+}
+
+static struct miscdev *new_miscdev(unsigned long minor, const char *name)
+{
+ struct miscdev *miscdev = xcalloc(1, sizeof(*miscdev));
+
+ INIT_LIST_HEAD(&miscdev->miscdevs);
+
+ miscdev->minor = minor;
+ miscdev->name = xstrdup(name);
+
+ return miscdev;
+}
+
+static void free_miscdev(struct miscdev *miscdev)
+{
+ free(miscdev->name);
+ free(miscdev);
+}
+
+static void read_misc(struct list_head *miscdevs_list, FILE *misc_fp)
+{
+ unsigned long minor;
+ char line[256];
+ char name[sizeof(line)];
+
+ while (fgets(line, sizeof(line), misc_fp)) {
+ struct miscdev *miscdev;
+
+ if (sscanf(line, "%lu %s", &minor, name) != 2)
+ continue;
+
+ miscdev = new_miscdev(minor, name);
+ list_add_tail(&miscdev->miscdevs, miscdevs_list);
+ }
+}
+
+static void cdev_class_initialize(void)
+{
+ FILE *misc_fp;
+
+ INIT_LIST_HEAD(&miscdevs);
+
+ misc_fp = fopen("/proc/misc", "r");
+ if (misc_fp) {
+ read_misc(&miscdevs, misc_fp);
+ fclose(misc_fp);
+ }
+}
+
+static void cdev_class_finalize(void)
+{
+ list_free(&miscdevs, struct miscdev, miscdevs, free_miscdev);
+}
+
+const char *get_miscdev(unsigned long minor)
+{
+ struct list_head *c;
+ list_for_each(c, &miscdevs) {
+ struct miscdev *miscdev = list_entry(c, struct miscdev, miscdevs);
+ if (miscdev->minor == minor)
+ return miscdev->name;
+ }
+ return NULL;
+}
+
+const struct file_class cdev_class = {
+ .super = &file_class,
+ .size = sizeof(struct file),
+ .initialize_class = cdev_class_initialize,
+ .finalize_class = cdev_class_finalize,
+ .fill_column = cdev_fill_column,
+ .free_content = NULL,
+};