diff options
Diffstat (limited to 'misc-utils/lsfd-cdev.c')
| -rw-r--r-- | misc-utils/lsfd-cdev.c | 178 |
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..795536a --- /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 = 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, +}; |