util-linux-ng-2.17.2/sys-utils/rdev.c - nest-learning-thermostat/5.1/util-linux-ng - Git at Google

 /*

   rdev.c  -  query/set root device.

 -------------------------------------------------------------------------

 Date: Sun, 27 Dec 1992 15:55:31 +0000
 Subject: Re: rdev
 From: almesber@nessie.cs.id.ethz.ch (Werner Almesberger)
 To: Rik Faith <faith@cs.unc.edu>

 There are quite a few versions of rdev:

   - the original rootdev that only printed the current root device, by
     Linus.
   - rdev that does what rootdev did and that also allows you to change
     the root (and swap) device, by me.
   - rdev got renamed to setroot and I think even to rootdev on various
     distributions.
   - Peter MacDonald added video mode and RAM disk setting and included
     this version on SLS, called rdev again. I've attached his rdev.c to
     this mail.

 -------------------------------------------------------------------------

 Date: 11 Mar 92 21:37:37 GMT
 Subject: rdev - query/set root device
 From: almesber@nessie.cs.id.ethz.ch (Werner Almesberger)
 Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH

 With all that socket, X11, disk driver and FS hacking going on, apparently
 nobody has found time to address one of the minor nuisances of life: set-
 ting the root FS device is still somewhat cumbersome. I've written a little
 utility which can read and set the root device in boot images:

 rdev accepts an optional offset argument, just in case the address should
 ever move from 508. If called without arguments, rdev outputs an mtab line
 for the current root FS, just like /etc/rootdev does.

 ramsize sets the size of the ramdisk.  If size is zero, no ramdisk is used.

 vidmode sets the default video mode at bootup time.  -1 uses default video
 mode, -2 uses menu.

 -------------------------------------------------------------------------

 Sun Dec 27 10:42:16 1992: Minor usage changes, faith@cs.unc.edu.
 Tue Mar 30 09:31:52 1993: rdev -Rn to set root readonly flag, sct@dcs.ed.ac.uk
 Wed Jun 22 21:12:29 1994: Applied patches from Dave
                           (gentzel@nova.enet.dec.com) to prevent dereferencing
 			  the NULL pointer, faith@cs.unc.edu
 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
 - added Native Language Support

 -------------------------------------------------------------------------

 */

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <dirent.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>

 #include "nls.h"

 /* rdev.c  -  query/set root device. */

 static void
 usage(void) {

     puts(_("usage: rdev [ -rv ] [ -o OFFSET ] [ IMAGE [ VALUE [ OFFSET ] ] ]"));
     puts(_("  rdev /dev/fd0  (or rdev /linux, etc.) displays the current ROOT device"));
     puts(_("  rdev /dev/fd0 /dev/hda2         sets ROOT to /dev/hda2"));
     puts(_("  rdev -R /dev/fd0 1              set the ROOTFLAGS (readonly status)"));
     puts(_("  rdev -r /dev/fd0 627            set the RAMDISK size"));
     puts(_("  rdev -v /dev/fd0 1              set the bootup VIDEOMODE"));
     puts(_("  rdev -o N ...                   use the byte offset N"));
     puts(_("  rootflags ...                   same as rdev -R"));
     puts(_("  ramsize ...                     same as rdev -r"));
     puts(_("  vidmode ...                     same as rdev -v"));
     puts(_("Note: video modes are: -3=Ask, -2=Extended, -1=NormalVga, 1=key1, 2=key2,..."));
     puts(_("      use -R 1 to mount root readonly, -R 0 for read/write."));
     exit(-1);
 }


 #define DEFAULT_OFFSET 508


 static void
 die(char *msg) {
 	perror(msg);
 	exit(1);
 }

 /* Earlier rdev fails on /dev/ida/c0d0p1 so we allow for
    recursion in /dev. -- Paul Clements */
 /* In fact devfs needs deep recursion. */

 static int
 find_dev_recursive(char *dirnamebuf, int number) {
 	DIR *dp;
 	struct dirent *dir;
 	struct stat s;
 	int dirnamelen = 0;

 	if ((dp = opendir(dirnamebuf)) == NULL)
 		die("opendir");
 	dirnamelen = strlen(dirnamebuf);
 	while ((dir = readdir(dp)) != NULL) {
 		if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
 			continue;
 		if (dirnamelen + 1 + strlen(dir->d_name) > PATH_MAX)
 			continue;
 		dirnamebuf[dirnamelen] = '/';
 		strcpy(dirnamebuf+dirnamelen+1, dir->d_name);
 		if (lstat(dirnamebuf, &s) < 0)
 			continue;
 		if ((s.st_mode & S_IFMT) == S_IFBLK && s.st_rdev == number)
 			return 1;
 		if ((s.st_mode & S_IFMT) == S_IFDIR &&
 		    find_dev_recursive(dirnamebuf, number))
 			return 1;
 	}
 	dirnamebuf[dirnamelen] = 0;
 	closedir(dp);
 	return 0;
 }

 static char *
 find_dev(int number) {
 	static char name[PATH_MAX+1];

 	if (!number)
 		return "Boot device";
 	strcpy(name, "/dev");
 	if (find_dev_recursive(name, number))
 		return name;
 	sprintf(name, "0x%04x", number);
 	return name;
 }

 /* The enum values are significant, things are stored in this order,
    see bootsect.S */
 enum { RDEV, VIDMODE, RAMSIZE, __swapdev__, __syssize__, ROOTFLAGS };
 char *cmdnames[6] = { "rdev", "vidmode",  "ramsize", "",
 		      "", "rootflags"};
 char *desc[6] = { "Root device", "Video mode",  "Ramsize",  "",
 		  "", "Root flags"};
 #define shift(n) argv+=n,argc-=n

 int
 main(int argc, char **argv) {
 	int image, offset, dev_nr, i, newoffset=-1;
 	char *ptr;
 	unsigned short val, have_val;
 	struct stat s;
 	int cmd;

 	setlocale(LC_ALL, "");
 	bindtextdomain(PACKAGE, LOCALEDIR);
 	textdomain(PACKAGE);

 	/* use the command name to figure out what we have to do - ugly */
 	cmd = RDEV;
 	if ((ptr = strrchr(argv[0],'/')) != NULL)
 		ptr++;
 	else
 		ptr = argv[0];
 	for (i=0; i<=5; i++) {
 		if (!strcmp(ptr,cmdnames[i])) {
 			cmd = i;
 			break;
 		}
 	}

 	while (argc > 1) {
 		if (argv[1][0] != '-')
 			break;
 		switch (argv[1][1]) {
 		case 'R':
 			cmd = ROOTFLAGS;
 			shift(1);
 			break;
 		case 'r':
 			cmd = RAMSIZE;
 			shift(1);
 			break;
 		case 'v':
 			cmd = VIDMODE;
 			shift(1);
 			break;
 		case 'o':
 			if (argv[1][2]) {
 				newoffset = atoi(argv[1]+2);
 				shift(1);
 				break;
 			} else if (argc > 2) {
 				newoffset = atoi(argv[2]);
 				shift(2);
 				break;
 			}
 			/* Fall through. . . */
 		default:
 			usage();
 		}
 	}

 	/* Here the only sensible way of using rdev */
 	if (argc == 1) {
 		if (cmd == RDEV) {
 			if (stat("/",&s) < 0) die("/");
 			printf("%s /\n", find_dev(s.st_dev));
 			exit(0);
 		}
 		usage();
 	}

 	if (argc > 4)
 		usage();

 	/* Ancient garbage.. */
 	offset = DEFAULT_OFFSET-cmd*2;
 	if (newoffset >= 0)
 		offset = newoffset;
 	if (argc == 4)
 		offset = atoi(argv[3]);

 	have_val = 0;

 	if (argc >= 3) {
 		if (cmd == RDEV) {
 			if (isdigit(*argv[2])) {
 				/* earlier: specify offset */
 				/* now: specify major,minor */
 				char *p;
 				unsigned int ma,mi;
 				if ((p = strchr(argv[2], ',')) == NULL)
 					die(_("missing comma"));
 				ma = atoi(argv[2]);
 				mi = atoi(p+1);
 				val = ((ma<<8) | mi);
 			} else {
 				char *device = argv[2];
 				if (stat(device,&s) < 0)
 					die(device);
 				val = s.st_rdev;
 			}
 		} else {
 			val = atoi(argv[2]);
 		}
 		have_val = 1;
 	}

 	if (have_val) {
 		if ((image = open(argv[1],O_WRONLY)) < 0) die(argv[1]);
 		if (lseek(image,offset,0) < 0) die("lseek");
 		if (write(image,(char *)&val,2) != 2) die(argv[1]);
 		if (close(image) < 0) die("close");
 	} else {
 		if ((image = open(argv[1],O_RDONLY)) < 0) die(argv[1]);
 		if (lseek(image,offset,0) < 0) die("lseek");
 		dev_nr = 0;
 		if (read(image,(char *)&dev_nr,2) != 2) die(argv[1]);
 		if (close(image) < 0) die("close");
 		fputs(desc[cmd], stdout);
 		if (cmd == RDEV)
 			printf(" %s\n", find_dev(dev_nr));
 		else
 			printf(" %d\n", dev_nr);
 	}
 	return 0;
 }
	/*

	rdev.c - query/set root device.

	-------------------------------------------------------------------------

	Date: Sun, 27 Dec 1992 15:55:31 +0000
	Subject: Re: rdev
	From: almesber@nessie.cs.id.ethz.ch (Werner Almesberger)
	To: Rik Faith <faith@cs.unc.edu>

	There are quite a few versions of rdev:

	- the original rootdev that only printed the current root device, by
	Linus.
	- rdev that does what rootdev did and that also allows you to change
	the root (and swap) device, by me.
	- rdev got renamed to setroot and I think even to rootdev on various
	distributions.
	- Peter MacDonald added video mode and RAM disk setting and included
	this version on SLS, called rdev again. I've attached his rdev.c to
	this mail.

	-------------------------------------------------------------------------

	Date: 11 Mar 92 21:37:37 GMT
	Subject: rdev - query/set root device
	From: almesber@nessie.cs.id.ethz.ch (Werner Almesberger)
	Organization: Swiss Federal Institute of Technology (ETH), Zurich, CH

	With all that socket, X11, disk driver and FS hacking going on, apparently
	nobody has found time to address one of the minor nuisances of life: set-
	ting the root FS device is still somewhat cumbersome. I've written a little
	utility which can read and set the root device in boot images:

	rdev accepts an optional offset argument, just in case the address should
	ever move from 508. If called without arguments, rdev outputs an mtab line
	for the current root FS, just like /etc/rootdev does.

	ramsize sets the size of the ramdisk. If size is zero, no ramdisk is used.

	vidmode sets the default video mode at bootup time. -1 uses default video
	mode, -2 uses menu.

	-------------------------------------------------------------------------

	Sun Dec 27 10:42:16 1992: Minor usage changes, faith@cs.unc.edu.
	Tue Mar 30 09:31:52 1993: rdev -Rn to set root readonly flag, sct@dcs.ed.ac.uk
	Wed Jun 22 21:12:29 1994: Applied patches from Dave
	(gentzel@nova.enet.dec.com) to prevent dereferencing
	the NULL pointer, faith@cs.unc.edu
	1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
	- added Native Language Support

	-------------------------------------------------------------------------

	*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <ctype.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <dirent.h>
	#include <unistd.h>
	#include <sys/types.h>
	#include <sys/stat.h>

	#include "nls.h"

	/* rdev.c - query/set root device. */

	static void
	usage(void) {

	puts(_("usage: rdev [ -rv ] [ -o OFFSET ] [ IMAGE [ VALUE [ OFFSET ] ] ]"));
	puts(_(" rdev /dev/fd0 (or rdev /linux, etc.) displays the current ROOT device"));
	puts(_(" rdev /dev/fd0 /dev/hda2 sets ROOT to /dev/hda2"));
	puts(_(" rdev -R /dev/fd0 1 set the ROOTFLAGS (readonly status)"));
	puts(_(" rdev -r /dev/fd0 627 set the RAMDISK size"));
	puts(_(" rdev -v /dev/fd0 1 set the bootup VIDEOMODE"));
	puts(_(" rdev -o N ... use the byte offset N"));
	puts(_(" rootflags ... same as rdev -R"));
	puts(_(" ramsize ... same as rdev -r"));
	puts(_(" vidmode ... same as rdev -v"));
	puts(_("Note: video modes are: -3=Ask, -2=Extended, -1=NormalVga, 1=key1, 2=key2,..."));
	puts(_(" use -R 1 to mount root readonly, -R 0 for read/write."));
	exit(-1);
	}


	#define DEFAULT_OFFSET 508


	static void
	die(char *msg) {
	perror(msg);
	exit(1);
	}

	/* Earlier rdev fails on /dev/ida/c0d0p1 so we allow for
	recursion in /dev. -- Paul Clements */
	/* In fact devfs needs deep recursion. */

	static int
	find_dev_recursive(char *dirnamebuf, int number) {
	DIR *dp;
	struct dirent *dir;
	struct stat s;
	int dirnamelen = 0;

	if ((dp = opendir(dirnamebuf)) == NULL)
	die("opendir");
	dirnamelen = strlen(dirnamebuf);
	while ((dir = readdir(dp)) != NULL) {
	if (!strcmp(dir->d_name, ".") \|\| !strcmp(dir->d_name, ".."))
	continue;
	if (dirnamelen + 1 + strlen(dir->d_name) > PATH_MAX)
	continue;
	dirnamebuf[dirnamelen] = '/';
	strcpy(dirnamebuf+dirnamelen+1, dir->d_name);
	if (lstat(dirnamebuf, &s) < 0)
	continue;
	if ((s.st_mode & S_IFMT) == S_IFBLK && s.st_rdev == number)
	return 1;
	if ((s.st_mode & S_IFMT) == S_IFDIR &&
	find_dev_recursive(dirnamebuf, number))
	return 1;
	}
	dirnamebuf[dirnamelen] = 0;
	closedir(dp);
	return 0;
	}

	static char *
	find_dev(int number) {
	static char name[PATH_MAX+1];

	if (!number)
	return "Boot device";
	strcpy(name, "/dev");
	if (find_dev_recursive(name, number))
	return name;
	sprintf(name, "0x%04x", number);
	return name;
	}

	/* The enum values are significant, things are stored in this order,
	see bootsect.S */
	enum { RDEV, VIDMODE, RAMSIZE, __swapdev__, __syssize__, ROOTFLAGS };
	char *cmdnames[6] = { "rdev", "vidmode", "ramsize", "",
	"", "rootflags"};
	char *desc[6] = { "Root device", "Video mode", "Ramsize", "",
	"", "Root flags"};
	#define shift(n) argv+=n,argc-=n

	int
	main(int argc, char **argv) {
	int image, offset, dev_nr, i, newoffset=-1;
	char *ptr;
	unsigned short val, have_val;
	struct stat s;
	int cmd;

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);

	/* use the command name to figure out what we have to do - ugly */
	cmd = RDEV;
	if ((ptr = strrchr(argv[0],'/')) != NULL)
	ptr++;
	else
	ptr = argv[0];
	for (i=0; i<=5; i++) {
	if (!strcmp(ptr,cmdnames[i])) {
	cmd = i;
	break;
	}
	}

	while (argc > 1) {
	if (argv[1][0] != '-')
	break;
	switch (argv[1][1]) {
	case 'R':
	cmd = ROOTFLAGS;
	shift(1);
	break;
	case 'r':
	cmd = RAMSIZE;
	shift(1);
	break;
	case 'v':
	cmd = VIDMODE;
	shift(1);
	break;
	case 'o':
	if (argv[1][2]) {
	newoffset = atoi(argv[1]+2);
	shift(1);
	break;
	} else if (argc > 2) {
	newoffset = atoi(argv[2]);
	shift(2);
	break;
	}
	/* Fall through. . . */
	default:
	usage();
	}
	}

	/* Here the only sensible way of using rdev */
	if (argc == 1) {
	if (cmd == RDEV) {
	if (stat("/",&s) < 0) die("/");
	printf("%s /\n", find_dev(s.st_dev));
	exit(0);
	}
	usage();
	}

	if (argc > 4)
	usage();

	/* Ancient garbage.. */
	offset = DEFAULT_OFFSET-cmd*2;
	if (newoffset >= 0)
	offset = newoffset;
	if (argc == 4)
	offset = atoi(argv[3]);

	have_val = 0;

	if (argc >= 3) {
	if (cmd == RDEV) {
	if (isdigit(*argv[2])) {
	/* earlier: specify offset */
	/* now: specify major,minor */
	char *p;
	unsigned int ma,mi;
	if ((p = strchr(argv[2], ',')) == NULL)
	die(_("missing comma"));
	ma = atoi(argv[2]);
	mi = atoi(p+1);
	val = ((ma<<8) \| mi);
	} else {
	char *device = argv[2];
	if (stat(device,&s) < 0)
	die(device);
	val = s.st_rdev;
	}
	} else {
	val = atoi(argv[2]);
	}
	have_val = 1;
	}

	if (have_val) {
	if ((image = open(argv[1],O_WRONLY)) < 0) die(argv[1]);
	if (lseek(image,offset,0) < 0) die("lseek");
	if (write(image,(char *)&val,2) != 2) die(argv[1]);
	if (close(image) < 0) die("close");
	} else {
	if ((image = open(argv[1],O_RDONLY)) < 0) die(argv[1]);
	if (lseek(image,offset,0) < 0) die("lseek");
	dev_nr = 0;
	if (read(image,(char *)&dev_nr,2) != 2) die(argv[1]);
	if (close(image) < 0) die("close");
	fputs(desc[cmd], stdout);
	if (cmd == RDEV)
	printf(" %s\n", find_dev(dev_nr));
	else
	printf(" %d\n", dev_nr);
	}
	return 0;
	}