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Verify that the specified device is at least as large as hw.physmem.

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This commit is contained in:
Dag-Erling Smørgrav 2004-10-03 23:38:49 +00:00
parent 842ddc99ec
commit c0046e261f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=136104
2 changed files with 55 additions and 23 deletions
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8
sbin/dumpon/dumpon.8
View File

@ -64,6 +64,14 @@ necessary to size the dump device larger than the actual amount of RAM
available in the machine.
.Pp
The
.Nm
utility will refuse to enable a dump device which is smaller than the
total amount of physical memory as reported by the
.Va hw.physmem
.Xr sysctl 8
variable.
.Pp
The
.Fl v
flag causes
.Nm

70
sbin/dumpon/dumpon.c
View File

@ -41,45 +41,78 @@ static char sccsid[] = "From: @(#)swapon.c 8.1 (Berkeley) 6/5/93";
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <paths.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/disk.h>
#include <sysexits.h>
#include <sys/sysctl.h>
void usage(void) __dead2;
#include <err.h>
#include <fcntl.h>
#include <paths.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>
static int verbose;
static void
usage(void)
{
fprintf(stderr, "%s\n%s\n",
"usage: dumpon [-v] special_file",
" dumpon [-v] off");
exit(EX_USAGE);
}
static void
check_size(int fd, const char *fn)
{
int name[] = { CTL_HW, HW_PHYSMEM };
size_t namelen = sizeof name / sizeof *name;
unsigned long physmem;
size_t len = sizeof physmem;
off_t mediasize;
if (sysctl(name, namelen, &physmem, &len, NULL, 0) != 0)
err(EX_OSERR, "can't get memory size");
if (ioctl(fd, DIOCGMEDIASIZE, &mediasize) != 0)
err(EX_OSERR, "%s: can't get size", fn);
if (mediasize < physmem) {
if (verbose)
printf("%s is smaller than physical memory\n", fn);
exit(EX_IOERR);
}
}
int
main(int argc, char *argv[])
{
int ch, verbose, rv;
int ch;
int i, fd;
u_int u;
verbose = rv = 0;
while ((ch = getopt(argc, argv, "v")) != -1)
switch((char)ch) {
case 'v':
verbose = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (!argv[0] || argv[1])
if (argc != 1)
usage();
if (strcmp(argv[0], "off")) {
if (strcmp(argv[0], "off") != 0) {
fd = open(argv[0], O_RDONLY);
if (fd < 0)
err(EX_OSFILE, "%s", argv[0]);
check_size(fd, argv[0]);
u = 0;
i = ioctl(fd, DIOCSKERNELDUMP, &u);
u = 1;
@ -101,12 +134,3 @@ main(int argc, char *argv[])
exit (0);
}
void
usage(void)
{
fprintf(stderr,
"usage: dumpon [-v] special_file\n"
" dumpon [-v] off\n");
exit(EX_USAGE);
}