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Read dumpdev using sysctl(3) interface. Now savecore should work again

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after the dev_t changes.
This commit is contained in:
Luoqi Chen 1999-05-13 04:29:09 +00:00
parent 7a73ea0414
commit 93fcd374b4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=47095
1 changed files with 22 additions and 16 deletions
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38
sbin/savecore/savecore.c
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@ -42,13 +42,14 @@ static const char copyright[] =
static char sccsid[] = "@(#)savecore.c 8.3 (Berkeley) 1/2/94";
#endif
static const char rcsid[] =
"$Id: savecore.c,v 1.21 1998/07/28 06:38:57 charnier Exp $";
"$Id: savecore.c,v 1.22 1999/03/12 14:46:00 gallatin Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/vm_param.h>
@ -74,29 +75,26 @@ static const char rcsid[] =
#endif
struct nlist current_nl[] = { /* Namelist for currently running system. */
#define X_DUMPDEV 0
{ "_dumpdev" },
#define X_DUMPLO 1
#define X_DUMPLO 0
{ "_dumplo" },
#define X_TIME 2
#define X_TIME 1
{ "_time_second" },
#define X_DUMPSIZE 3
#define X_DUMPSIZE 2
{ "_dumpsize" },
#define X_VERSION 4
#define X_VERSION 3
{ "_version" },
#define X_PANICSTR 5
#define X_PANICSTR 4
{ "_panicstr" },
#define X_DUMPMAG 6
#define X_DUMPMAG 5
{ "_dumpmag" },
{ "" },
};
int cursyms[] = { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 };
int cursyms[] = { X_DUMPLO, X_VERSION, X_DUMPMAG, -1 };
int dumpsyms[] = { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 };
struct nlist dump_nl[] = { /* Name list for dumped system. */
{ "_dumpdev" }, /* Entries MUST be the same as */
{ "_dumplo" }, /* those in current_nl[]. */
{ "_time_second" },
{ "_dumplo" }, /* Entries MUST be the same as */
{ "_time_second" }, /* those in current_nl[]. */
{ "_dumpsize" },
{ "_version" },
{ "_panicstr" },
@ -216,6 +214,8 @@ kmem_setup()
FILE *fp;
int kmem, i;
const char *dump_sys;
int mib[2];
size_t len;
/*
* Some names we need for the currently running system, others for
@ -245,13 +245,19 @@ kmem_setup()
exit(1);
}
kmem = Open(_PATH_KMEM, O_RDONLY);
Lseek(kmem, (off_t)current_nl[X_DUMPDEV].n_value, L_SET);
(void)Read(kmem, &dumpdev, sizeof(dumpdev));
mib[0] = CTL_KERN;
mib[1] = KERN_DUMPDEV;
len = sizeof dumpdev;
if (sysctl(mib, 2, &dumpdev, &len, NULL, 0) == -1) {
syslog(LOG_ERR, "sysctl: kern.dumpdev: %m");
exit(1);
}
if (dumpdev == NODEV) {
syslog(LOG_WARNING, "no core dump (no dumpdev)");
exit(1);
}
kmem = Open(_PATH_KMEM, O_RDONLY);
Lseek(kmem, (off_t)current_nl[X_DUMPLO].n_value, L_SET);
(void)Read(kmem, &dumplo, sizeof(dumplo));
if (verbose)