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/*
* 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 = strdup(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 = strdup(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,
};