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https://github.com/systemd/systemd-stable.git
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1aa1e24848
We never used any of the libsysfs convenience features. Here we replace it completely with 300 lines of code, which are much simpler and a bit faster cause udev(d) does not open any syfs file for a simple event which does not need any parent device information. Signed-off-by: Kay Sievers <kay.sievers@suse.de>
153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/*
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* cdrom_id - determines the capabilities of cdrom drives
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*
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* Copyright (C) 2005 Greg Kroah-Hartman <gregkh@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <linux/types.h>
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#include "../../udev.h"
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/*
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* Taken from the cdrom.h kernel include file.
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* Included here as some distros don't have an updated version
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* with all of the DVD flags. So we just include our own, aren't
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* we so nice...
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*/
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#define CDROM_GET_CAPABILITY 0x5331 /* get capabilities */
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/* capability flags used with the uniform CD-ROM driver */
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#define CDC_CLOSE_TRAY 0x1 /* caddy systems _can't_ close */
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#define CDC_OPEN_TRAY 0x2 /* but _can_ eject. */
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#define CDC_LOCK 0x4 /* disable manual eject */
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#define CDC_SELECT_SPEED 0x8 /* programmable speed */
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#define CDC_SELECT_DISC 0x10 /* select disc from juke-box */
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#define CDC_MULTI_SESSION 0x20 /* read sessions>1 */
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#define CDC_MCN 0x40 /* Medium Catalog Number */
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#define CDC_MEDIA_CHANGED 0x80 /* media changed */
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#define CDC_PLAY_AUDIO 0x100 /* audio functions */
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#define CDC_RESET 0x200 /* hard reset device */
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#define CDC_IOCTLS 0x400 /* driver has non-standard ioctls */
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#define CDC_DRIVE_STATUS 0x800 /* driver implements drive status */
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#define CDC_GENERIC_PACKET 0x1000 /* driver implements generic packets */
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#define CDC_CD_R 0x2000 /* drive is a CD-R */
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#define CDC_CD_RW 0x4000 /* drive is a CD-RW */
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#define CDC_DVD 0x8000 /* drive is a DVD */
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#define CDC_DVD_R 0x10000 /* drive can write DVD-R */
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#define CDC_DVD_RAM 0x20000 /* drive can write DVD-RAM */
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#define CDC_MO_DRIVE 0x40000 /* drive is an MO device */
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#define CDC_MRW 0x80000 /* drive can read MRW */
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#define CDC_MRW_W 0x100000 /* drive can write MRW */
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#define CDC_RAM 0x200000 /* ok to open for WRITE */
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#ifdef USE_LOG
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void log_message(int priority, const char *format, ...)
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{
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va_list args;
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static int udev_log = -1;
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if (udev_log == -1) {
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const char *value;
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value = getenv("UDEV_LOG");
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if (value)
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udev_log = log_priority(value);
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else
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udev_log = LOG_ERR;
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}
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if (priority > udev_log)
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return;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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}
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#endif
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int main(int argc, char *argv[])
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{
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const char *node = NULL;
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int i;
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int export = 0;
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int fd;
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int rc = 0;
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int result;
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logging_init("cdrom_id");
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for (i = 1 ; i < argc; i++) {
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char *arg = argv[i];
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if (strcmp(arg, "--export") == 0) {
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export = 1;
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} else
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node = arg;
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}
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if (!node) {
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info("no node specified");
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rc = 1;
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goto exit;
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}
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fd = open(node, O_RDONLY|O_NONBLOCK);
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if (fd < 0) {
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info("unable to open '%s'", node);
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rc = 1;
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goto exit;
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}
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result = ioctl(fd, CDROM_GET_CAPABILITY, NULL);
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if (result < 0) {
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info("CDROM_GET_CAPABILITY failed for '%s'", node);
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rc = 3;
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goto close;
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}
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printf("ID_CDROM=1\n");
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if (result & CDC_CD_R)
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printf("ID_CDROM_CD_R=1\n");
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if (result & CDC_CD_RW)
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printf("ID_CDROM_CD_RW=1\n");
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if (result & CDC_DVD)
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printf("ID_CDROM_DVD=1\n");
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if (result & CDC_DVD_R)
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printf("ID_CDROM_DVD_R=1\n");
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if (result & CDC_DVD_RAM)
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printf("ID_CDROM_DVD_RAM=1\n");
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if (result & CDC_MRW)
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printf("ID_CDROM_MRW=1\n");
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if (result & CDC_MRW_W)
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printf("ID_CDROM_MRW_W=1\n");
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if (result & CDC_RAM)
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printf("ID_CDROM_RAM=1\n");
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close:
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close(fd);
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exit:
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logging_close();
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return rc;
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}
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