=/^G show total bytes now; document may not always work

[unix-history] / usr / src / sbin / savecore / savecore.c

diff --git a/usr/src/sbin/savecore/savecore.c b/usr/src/sbin/savecore/savecore.c
index b2d6000..71292a3 100644 (file)
--- a/usr/src/sbin/savecore/savecore.c
+++ b/usr/src/sbin/savecore/savecore.c
@@ -1,19 +1,32 @@
 /*
 /*

- *     savecore.c      4.3     81/04/14
- * savecore dirname
- *     Written by Michael Toy (UCB)
- *     Program meant to be called from the /etc/rc file for saving the
- * dump of a crashed system.  If the core file has not already been saved
- * then save it in dirname (if there is at least minfree blocks on the
- * device the directory is on.)
- *     1) Make certain "dirname" exists
- *     2) Get dumpdev and dumplo from vmunix/kmem
- *     3) Find dump device name get time from core image
- *     4) Look in "dirname" generate a name se
- *             vmunix.n
- *             vmcore.n
- *     5) Check in "dirname"/minfree to be certain there is space
- *     6) Make entry in shutdown log with date and cause of crash
+ * Copyright (c) 1980, 1986 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1980, 1986 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)savecore.c 5.14 (Berkeley) %G%";
+#endif /* not lint */
+
+/*
+ * savecore

  */
 
 #include <stdio.h>
  */
 
 #include <stdio.h>


@@ -21,450 +34,470 @@
 #include <sys/param.h>
 #include <sys/dir.h>
 #include <sys/stat.h>
 #include <sys/param.h>
 #include <sys/dir.h>
 #include <sys/stat.h>

-#include <sys/filsys.h>
-#include <time.h>
-
-#define LEEWAY (60L*60L*24L*3L)        /* Maximum reasonable dump age diff (3 days )*/
-#define eq(a,b) (strcmp(a,b)==0)
-#define ok(number) (number&0x7fffffff)
-#define SHUTDOWNLOG "/usr/adm/shutdownlog"
-#define TRUE (1)
-#define FALSE (0)
-
-struct nlist nl[] = {
+#include <sys/time.h>
+#include <sys/file.h>
+#include <sys/syslog.h>
+
+#define        DAY     (60L*60L*24L)
+#define        LEEWAY  (3*DAY)
+
+#define eq(a,b) (!strcmp(a,b))
+#ifdef vax
+#define ok(number) ((number)&0x7fffffff)
+#else
+#ifdef tahoe
+#define ok(number) ((number)&~0xc0000000)
+#else
+#define ok(number) (number)
+#endif
+#endif
+
+struct nlist current_nl[] = {  /* namelist for currently running system */

 #define X_DUMPDEV      0
        { "_dumpdev" },
 #define X_DUMPLO       1
        { "_dumplo" },
 #define X_TIME         2
        { "_time" },
 #define X_DUMPDEV      0
        { "_dumpdev" },
 #define X_DUMPLO       1
        { "_dumplo" },
 #define X_TIME         2
        { "_time" },

-#define X_PHYSMEM      3
-       { "_physmem" },
+#define        X_DUMPSIZE      3
+       { "_dumpsize" },

 #define X_VERSION      4
        { "_version" },
 #define X_PANICSTR     5
        { "_panicstr" },
 #define X_VERSION      4
        { "_version" },
 #define X_PANICSTR     5
        { "_panicstr" },

-       { 0 },
+#define        X_DUMPMAG       6
+       { "_dumpmag" },
+       { "" },
+};
+
+struct nlist dump_nl[] = {     /* name list for dumped system */
+       { "_dumpdev" },         /* entries MUST be the same as */
+       { "_dumplo" },          /*      those in current_nl[]  */
+       { "_time" },
+       { "_dumpsize" },
+       { "_version" },
+       { "_panicstr" },
+       { "_dumpmag" },
+       { "" },

 };
 
 };
 

-char *dirname;                         /* Directory to save dumps in */
-char *ddname;                          /* Name of dump device */
-char *find_dev();
-int minfree;                           /* Minimum free blocks on device */
-dev_t dumpdev;                         /* Dump device */
-time_t dumptime;                       /* Time the dump was taken */
-int dumplo;                            /* Where dump starts on dumpdev */
-int physmem;                           /* Amount of memory in machine */
-time_t now;                            /* Current date */
-char *path(), *malloc();
-char vers[80], core_vers[80];
-char panic_mesg[80];
-int panicstr;
-int do_the_dump = TRUE;
+char   *system;
+char   *dirname;                       /* directory to save dumps in */
+char   *ddname;                        /* name of dump device */
+char   *find_dev();
+dev_t  dumpdev;                        /* dump device */
+time_t dumptime;                       /* time the dump was taken */
+int    dumplo;                         /* where dump starts on dumpdev */
+int    dumpsize;                       /* amount of memory dumped */
+int    dumpmag;                        /* magic number in dump */
+time_t now;                            /* current date */
+char   *path();
+char   *malloc();
+char   *ctime();
+char   vers[80];
+char   core_vers[80];
+char   panic_mesg[80];
+int    panicstr;
+off_t  lseek();
+off_t  Lseek();
+int    Verbose;
+int    force;
+int    clear;
+extern int errno;

 
 main(argc, argv)
 
 main(argc, argv)

-char **argv;
-int argc;
+       char **argv;
+       int argc;

 {
 {

-       if (argc != 2)
-       {
-               fprintf(stderr, "usage: savecore dirname\n");
-               exit(1);
-       }
-       dirname = argv[1];
-       if (access(dirname, 2) < 0)
-       {
-               perror(dirname);
-               exit(4);
-       }
-       /*
-        * Now invoke the local dieties so that things get done
-        */
-       time(&now);
-       read_kmem();
-       log_entry();
-       if (do_the_dump && get_crashtime() && check_space())
-               save_core();
-}
-
-/*
- * find_dev
- *     Lookup a dev in the /dev directory, return the dev name
- */
+       char *cp;

 
 

-char *find_dev(dev, type)
-register dev_t dev;
-register int type;
-{
-       register int dfd = Open("/dev", 0);
-       struct direct dir;
-       struct stat statb;
-       static char devname[DIRSIZ + 1];
-       char *dp;
+       argc--, argv++;
+       while (argc > 0 && argv[0][0] == '-') {
+               for (cp = &argv[0][1]; *cp; cp++) switch (*cp) {

 
 

-       strcpy(devname, "/dev/");
-       while(Read(dfd, &dir, sizeof dir) > 0)
-       {
-               if (dir.d_ino == 0)
-                       continue;
-               strncpy(devname + 5, dir.d_name, DIRSIZ);
-               devname[DIRSIZ] = '\0';
-               if (stat(devname, &statb))
-                       perror(devname);
-               else
-               {
-                       if ((statb.st_mode&S_IFMT) != type)
-                               continue;
-                       if (dev == statb.st_rdev)
-                       {
-                               close(dfd);
-                               dp = malloc(strlen(devname)+1);
-                               strcpy(dp, devname);
-                               return dp;
-                       }
-               }
-       }
-       close(dfd);
-       fprintf(stderr, "Can't find device %d,%d\n", major(dev), minor(dev));
-       exit(7);
-}
+               case 'f':
+                       force++;
+                       break;

 
 

-/*
- * Open
- *     Open and exit if open fails
- */
+               case 'v':
+                       Verbose++;
+                       break;

 
 

-Open(name, rw)
-char *name;
-int rw;
-{
-       int fd;
+               case 'c':
+                       clear++;
+                       break;

 
 

-       if ((fd = open(name, rw)) < 0)
-       {
-               perror(name);
-               exit(2);
+               default:
+               usage:
+                       fprintf(stderr,
+                           "usage: savecore [-f] [-v] dirname [ system ]\n");
+                       exit(1);
+               }
+               argc--, argv++;

        }
        }

-       return fd;
+       if (argc != 1 && argc != 2)
+               goto usage;
+       dirname = argv[0];
+       if (argc == 2)
+               system = argv[1];
+       openlog("savecore", LOG_ODELAY, LOG_AUTH);
+       if (access(dirname, W_OK) < 0) {
+               Perror(LOG_ERR, "%s: %m", dirname);
+               exit(1);
+       }
+       read_kmem();

 }
 
 }
 

-/*
- * Read, like read but checks bad return codes
- */
-
-Read(fd, buff, size)
-int fd, size;
-char *buff;
+dump_exists()

 {
 {

-       int ret;
+       register int dumpfd;
+       int word;

 
 

-       if ((ret = read(fd, buff, size)) < 0)
-       {
-               perror("reading");
-               exit(3);
+       dumpfd = Open(ddname, O_RDONLY);
+       Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET);
+       Read(dumpfd, (char *)&word, sizeof (word));
+       close(dumpfd);
+       if (Verbose && word != dumpmag) {
+               printf("dumplo = %d (%d bytes)\n", dumplo/DEV_BSIZE, dumplo);
+               printf("magic number mismatch: %x != %x\n", word, dumpmag);

        }
        }

-       return ret;
+       return (word == dumpmag);

 }
 
 }
 

-/*
- * Lseek
- *     A "safe" lseek
- */
-
-long Lseek(fd, off, flag)
-int fd, flag;
-long off;
+clear_dump()

 {
 {

-       long ret;
+       register int dumpfd;
+       int zero = 0;

 
 

-       if ((ret = lseek(fd, off, flag)) == -1L)
-       {
-               perror("lseek");
-               exit(5);
-       }
-       return ret;
+       dumpfd = Open(ddname, O_WRONLY);
+       Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_DUMPMAG].n_value)), L_SET);
+       Write(dumpfd, (char *)&zero, sizeof (zero));
+       close(dumpfd);

 }
 
 }
 

-Create(file, mode)
-char *file;
-int mode;
+char *
+find_dev(dev, type)
+       register dev_t dev;
+       register int type;

 {
 {

-       register int fd;
+       struct stat statb;
+       char *dp;

 
 

-       if ((fd = creat(file, mode)) < 0)
-       {
-               perror(file);
-               exit(9);
+       strcpy(devname, "/dev/");
+               if (stat(devname, &statb)) {
+                       perror(devname);
+                       continue;
+               }
+               if ((statb.st_mode&S_IFMT) != type)
+                       continue;
+               if (dev == statb.st_rdev) {
+                       dp = malloc(strlen(devname)+1);
+                       strcpy(dp, devname);
+                       return (dp);
+               }

        }
        }

-       return fd;
+       log(LOG_ERR, "Can't find device %d/%d\n", major(dev), minor(dev));
+       exit(1);
+       /*NOTREACHED*/

 }
 
 }
 

-Write(fd, buf, size)
-int fd, size;
-char *buf;
+int    cursyms[] =
+    { X_DUMPDEV, X_DUMPLO, X_VERSION, X_DUMPMAG, -1 };
+int    dumpsyms[] =
+    { X_TIME, X_DUMPSIZE, X_VERSION, X_PANICSTR, X_DUMPMAG, -1 };
+read_kmem()

 {
 {

-       if (write(fd, buf, size) < size)
-       {
-               perror("Writing");
-               exit(10);
+       register char *cp;
+       FILE *fp;
+       char *dump_sys;
+       int kmem, i;
+       
+       dump_sys = system ? system : "/vmunix";
+       nlist("/vmunix", current_nl);
+       nlist(dump_sys, dump_nl);
+       /*
+        * Some names we need for the currently running system,
+        * others for the system that was running when the dump was made.
+        * The values obtained from the current system are used
+        * to look for things in /dev/kmem that cannot be found
+        * in the dump_sys namelist, but are presumed to be the same
+        * (since the disk partitions are probably the same!)
+        */
+       for (i = 0; cursyms[i] != -1; i++)
+               if (current_nl[cursyms[i]].n_value == 0) {
+                       log(LOG_ERR, "/vmunix: %s not in namelist\n",
+                           current_nl[cursyms[i]].n_name);
+                       exit(1);
+               }
+       for (i = 0; dumpsyms[i] != -1; i++)
+               if (dump_nl[dumpsyms[i]].n_value == 0) {
+                       log(LOG_ERR, "%s: %s not in namelist\n", dump_sys,
+                           dump_nl[dumpsyms[i]].n_name);
+                       exit(1);
+               }
+       kmem = Open("/dev/kmem", O_RDONLY);
+       Lseek(kmem, (long)current_nl[X_DUMPDEV].n_value, L_SET);
+       Read(kmem, (char *)&dumpdev, sizeof (dumpdev));
+       Lseek(kmem, (long)current_nl[X_DUMPLO].n_value, L_SET);
+       Read(kmem, (char *)&dumplo, sizeof (dumplo));
+       Lseek(kmem, (long)current_nl[X_DUMPMAG].n_value, L_SET);
+       Read(kmem, (char *)&dumpmag, sizeof (dumpmag));
+       dumplo *= DEV_BSIZE;
+       ddname = find_dev(dumpdev, S_IFBLK);
+       fp = fdopen(kmem, "r");
+       if (fp == NULL) {
+               log(LOG_ERR, "Couldn't fdopen kmem\n");
+               exit(1);

        }
        }

+       if (system)
+               return;
+       fseek(fp, (long)current_nl[X_VERSION].n_value, L_SET);
+       fgets(vers, sizeof (vers), fp);
+       fclose(fp);

 }
 
 }
 

-/*
- * Get dumpdev and dumplo from kmem/vmunix
- */
-
-read_kmem()
+check_kmem()

 {
 {

-       int kmem;

        FILE *fp;
        register char *cp;
 
        FILE *fp;
        register char *cp;
 

-       nlist("/vmunix", nl);
-       if (nl[X_DUMPDEV].n_value == 0)
-       {
-           fprintf(stderr, "savecore: dumpdev not in namelist\n");
-           exit(6);
-       }
-       if (nl[X_DUMPLO].n_value == 0)
-       {
-           fprintf(stderr, "savecore: dumplo not in namelist\n");
-           exit(6);
-       }
-       if (nl[X_TIME].n_value == 0)
-       {
-           fprintf(stderr, "savecore: time not in namelist\n");
-           exit(6);
-       }
-       if (nl[X_PHYSMEM].n_value == 0)
-       {
-               fprintf("savecore: physmem not in namelist\n");
-               exit(6);
-       }
-       if (nl[X_VERSION].n_value == 0)
-       {
-               fprintf("savecore: version not in namelist\n");
-               exit(6);
-       }
-       if (nl[X_PANICSTR].n_value == 0)
-       {
-               fprintf("savecore: panicstr not in namelist\n");
-               exit(6);
-       }
-       kmem = Open("/dev/kmem", 0);
-       Lseek(kmem, nl[X_DUMPDEV].n_value, 0);
-       Read(kmem, &dumpdev, sizeof dumpdev);
-       Lseek(kmem, nl[X_DUMPLO].n_value, 0);
-       Read(kmem, &dumplo, sizeof dumplo);
-       Lseek(kmem, nl[X_PHYSMEM].n_value, 0);
-       Read(kmem, &physmem, sizeof physmem);
-       Lseek(kmem, nl[X_PANICSTR].n_value, 0);
-       Read(kmem, &panicstr, sizeof panicstr);
-       dumplo *= 512L;
-       ddname = find_dev(dumpdev, S_IFBLK);
-       /*
-        * Check for version mismatch
-        */
-       if ((fp = fdopen(kmem, "r")) == NULL)
-       {
-               fprintf(stderr, "Couldn't fdopen kmem\n");
-               exit(11);
-       }
-       fseek(fp, nl[X_VERSION].n_value, 0);
-       fgets(vers, sizeof vers, fp);
-       fclose(fp);
-       if ((fp = fopen(ddname, "r")) == NULL)
-       {
-               perror(ddname);
-               exit(12);
+       fp = fopen(ddname, "r");
+       if (fp == NULL) {
+               Perror(LOG_ERR, "%s: %m", ddname);
+               exit(1);

        }
        }

-       fseek(fp, dumplo+ok(nl[X_VERSION].n_value), 0);
-       fgets(core_vers, sizeof core_vers, fp);
+       fseek(fp, (off_t)(dumplo+ok(dump_nl[X_VERSION].n_value)), L_SET);
+       fgets(core_vers, sizeof (core_vers), fp);

        fclose(fp);
        fclose(fp);

-       if (!eq(vers, core_vers))
-       {
-               fprintf(stderr, "Version mismatch:\n\t%sand\n\t%s",
-                               vers,core_vers);
-               fprintf(stderr, "Core not saved\n");
-               do_the_dump = FALSE;
-               return;
+       if (!eq(vers, core_vers) && system == 0) {
+               log(LOG_WARNING, "Warning: vmunix version mismatch:\n");
+               log(LOG_WARNING, "\t%s\n", vers);
+               log(LOG_WARNING, "and\t%s\n", core_vers);

        }
        }

-       /*
-        * Now check the panic string
-        */
-       if (panicstr)
-       {
-               fp = fopen(ddname, "r");
-               fseek(fp, dumplo + ok(panicstr));
+       fp = fopen(ddname, "r");
+       fseek(fp, (off_t)(dumplo + ok(dump_nl[X_PANICSTR].n_value)), L_SET);
+       fread((char *)&panicstr, sizeof (panicstr), 1, fp);
+       if (panicstr) {
+               fseek(fp, dumplo + ok(panicstr), L_SET);

                cp = panic_mesg;
                do
                        *cp = getc(fp);
                while (*cp++);
                cp = panic_mesg;
                do
                        *cp = getc(fp);
                while (*cp++);

-               fclose(fp);

        }
        }

-}      
-
-/*
- * Now get the time of the crash
- */
+       fclose(fp);
+}

 
 

- get_crashtime()
- {
+get_crashtime()
+{

        int dumpfd;
        time_t clobber = (time_t)0;
 
        int dumpfd;
        time_t clobber = (time_t)0;
 

-       dumpfd = Open(ddname, 2);
-       Lseek(dumpfd, dumplo + ok(nl[X_TIME].n_value), 0);
-       Read(dumpfd, &dumptime, sizeof dumptime);
-       Lseek(dumpfd, dumplo + ok(nl[X_TIME].n_value), 0);
-       Write(dumpfd, &clobber, sizeof clobber);
+       dumpfd = Open(ddname, O_RDONLY);
+       Lseek(dumpfd, (off_t)(dumplo + ok(dump_nl[X_TIME].n_value)), L_SET);
+       Read(dumpfd, (char *)&dumptime, sizeof dumptime);

        close(dumpfd);
        close(dumpfd);

-       if (dumptime == 0)
-               return FALSE;
+       if (dumptime == 0) {
+               if (Verbose)
+                       printf("Dump time is zero.\n");
+               return (0);
+       }

        printf("System went down at %s", ctime(&dumptime));
        if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) {
        printf("System went down at %s", ctime(&dumptime));
        if (dumptime < now - LEEWAY || dumptime > now + LEEWAY) {

-               printf("Dump time is unreasonable\n");
-               return FALSE;
-       } else {
-               return TRUE;
+               printf("dump time is unreasonable\n");
+               return (0);

        }
        }

+       return (1);

 }
 
 }
 

-/*
- * Put a file name in the proper perspective
- */
-
-char *path(file)
+char *
+path(file)
+       char *file;

 {
        register char *cp = malloc(strlen(file) + strlen(dirname) + 2);
 
 {
        register char *cp = malloc(strlen(file) + strlen(dirname) + 2);
 

-       strcpy(cp, dirname);
-       strcat(cp, "/");
-       strcat(cp, file);
-       return cp;
+       (void) strcpy(cp, dirname);
+       (void) strcat(cp, "/");
+       (void) strcat(cp, file);
+       return (cp);

 }
 
 }
 

-/*
- * Check to make certain that there is enough space for this dump
- */
-

 check_space()
 {
        struct stat dsb;
        register char *ddev;
 check_space()
 {
        struct stat dsb;
        register char *ddev;

-       register int dfd;
-       struct filsys sblk;
+       int dfd, spacefree;
+       struct fs fs;

 
 

-       /*
-        * First find the number of free blocks
-        */
-       stat(dirname, &dsb);
+       if (stat(dirname, &dsb) < 0) {
+               Perror(LOG_ERR, "%s: %m", dirname);
+               exit(1);
+       }

        ddev = find_dev(dsb.st_dev, S_IFBLK);
        ddev = find_dev(dsb.st_dev, S_IFBLK);

-       dfd = Open(ddev, 0);
-       Lseek(dfd, 1L<<BSHIFT, 0);
-       Read(dfd, &sblk, sizeof sblk);
+       dfd = Open(ddev, O_RDONLY);
+       Lseek(dfd, SBOFF, L_SET);
+       Read(dfd, (char *)&fs, sizeof (fs));

        close(dfd);
        close(dfd);

-       /*
-        * Now check against maximum allowed
-        */
-       if (read_number("minfree") > sblk.s_tfree)
-       {
-               fprintf(stderr, "*** Dump not done, not enough space ***\n");
-               return FALSE;
+       spacefree = freespace(&fs, fs.fs_minfree) * fs.fs_fsize / 1024;
+       if (spacefree < read_number("minfree")) {
+               log(LOG_WARNING, "Dump omitted, not enough space on device\n");
+               return (0);

        }
        }

-       else
-               return TRUE;
+       if (freespace(&fs, fs.fs_minfree) < 0)
+               log(LOG_WARNING,
+                   "Dump performed, but free space threshold crossed\n");
+       return (1);

 }
 
 }
 

-/*
- * Read a number from a file
- */
-

 read_number(fn)
 read_number(fn)

-char *fn;
+       char *fn;

 {
        char lin[80];
        register FILE *fp;
 
 {
        char lin[80];
        register FILE *fp;
 

-       if ((fp = fopen(path(fn), "r")) == NULL)
-               return 0;
-       else
-       {
-               if (fgets(lin, 80, fp) == NULL)
-               {
-                       fclose(fp);
-                       return 0;
-               }
-               else
-               {
-                       fclose(fp);
-                       return atoi(lin);
-               }
+       fp = fopen(path(fn), "r");
+       if (fp == NULL)
+               return (0);
+       if (fgets(lin, 80, fp) == NULL) {
+               fclose(fp);
+               return (0);

        }
        }

+       fclose(fp);
+       return (atoi(lin));

 }
 
 }
 

+#define        BUFPAGES        (256*1024/NBPG)         /* 1/4 Mb */
+

 save_core()
 {
        register int n;
 save_core()
 {
        register int n;

-       char buffer[BUFSIZ];
-       register char *cp = buffer;
+       register char *cp;

        register int ifd, ofd, bounds;
        register FILE *fp;
 
        register int ifd, ofd, bounds;
        register FILE *fp;
 

+       cp = malloc(BUFPAGES*NBPG);
+       if (cp == 0) {
+               fprintf(stderr, "savecore: Can't allocate i/o buffer.\n");
+               return;
+       }

        bounds = read_number("bounds");
        bounds = read_number("bounds");

-       /*
-        * Copy the vmunix file
-        */
-       ifd = Open("/vmunix", 0);
-       ofd = Create(path(sprintf(cp, "vmunix.%d", bounds)), 0666);
+       ifd = Open(system?system:"/vmunix", O_RDONLY);

        while((n = Read(ifd, cp, BUFSIZ)) > 0)
                Write(ofd, cp, n);
        close(ifd);
        close(ofd);
        while((n = Read(ifd, cp, BUFSIZ)) > 0)
                Write(ofd, cp, n);
        close(ifd);
        close(ofd);

-       /*
-        * Make the core file
-        */
-       ifd = Open(ddname, 0);
-       ofd = Create(path(sprintf(cp, "vmcore.%d", bounds)), 0666);
-       Lseek(ifd, dumplo, 0);
-       printf("Saving %d bytes of image in vmcore.%d\n",
-           NBPG * physmem, bounds);
-       while(physmem > 0)
-       {
-               n = Read(ifd, cp, BUFSIZ);
+       ifd = Open(ddname, O_RDONLY);
+       Lseek(ifd, (off_t)(dumplo + ok(dump_nl[X_DUMPSIZE].n_value)), L_SET);
+       Read(ifd, (char *)&dumpsize, sizeof (dumpsize));
+       (void)sprintf(cp, "vmcore.%d", bounds);
+       ofd = Create(path(cp), 0644);
+       Lseek(ifd, (off_t)dumplo, L_SET);
+       log(LOG_NOTICE, "Saving %d bytes of image in vmcore.%d\n",
+           NBPG*dumpsize, bounds);
+       while (dumpsize > 0) {
+               n = Read(ifd, cp,
+                   (dumpsize > BUFPAGES ? BUFPAGES : dumpsize) * NBPG);
+               if (n == 0) {
+                       log(LOG_WARNING, "WARNING: vmcore may be incomplete\n");
+                       break;
+               }

                Write(ofd, cp, n);
                Write(ofd, cp, n);

-               physmem -= n/NBPG;
+               dumpsize -= n/NBPG;

        }
        close(ifd);
        close(ofd);
        fp = fopen(path("bounds"), "w");
        fprintf(fp, "%d\n", bounds+1);
        fclose(fp);
        }
        close(ifd);
        close(ofd);
        fp = fopen(path("bounds"), "w");
        fprintf(fp, "%d\n", bounds+1);
        fclose(fp);

+       free(cp);

 }
 
 }
 

-char *days[] = {
-       "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
-};
+/*
+ * Versions of std routines that exit on error.
+ */
+Open(name, rw)
+       char *name;
+       int rw;
+{
+       int fd;

 
 

-char *months[] = {
-       "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep",
-       "Oct", "Nov", "Dec"
-};
+       fd = open(name, rw);
+       if (fd < 0) {
+               Perror(LOG_ERR, "%s: %m", name);
+               exit(1);
+       }
+       return (fd);
+}

 
 

-log_entry()
+Read(fd, buff, size)
+       int fd, size;
+       char *buff;

 {
 {

-       FILE *fp;
-       struct tm *tm, *localtime();
-
-       tm = localtime(&now);
-       fp = fopen(SHUTDOWNLOG, "a");
-       fseek(fp, 0L, 2);
-       fprintf(fp, "%02d:%02d  %s %s %2d, %4d.  Reboot", tm->tm_hour,
-               tm->tm_min, days[tm->tm_wday], months[tm->tm_mon],
-               tm->tm_mday, tm->tm_year + 1900);
-       if (panicstr)
-               fprintf(fp, " -- panic %s\n", panic_mesg);
-       else
-               putc('\n', fp);
-       fclose(fp);
+       int ret;
+
+       ret = read(fd, buff, size);
+       if (ret < 0) {
+               Perror(LOG_ERR, "read: %m");
+               exit(1);
+       }
+       return (ret);
+}
+
+off_t
+Lseek(fd, off, flag)
+       int fd, flag;
+       long off;
+{
+       long ret;
+
+       ret = lseek(fd, off, flag);
+       if (ret == -1) {
+               Perror(LOG_ERR, "lseek: %m");
+               exit(1);
+       }
+       return (ret);
+}
+
+Create(file, mode)
+       char *file;
+       int mode;
+{
+       register int fd;
+
+       fd = creat(file, mode);
+       if (fd < 0) {
+               Perror(LOG_ERR, "%s: %m", file);
+               exit(1);
+       }
+       return (fd);
+}
+
+Write(fd, buf, size)
+       int fd, size;
+       char *buf;
+{
+
+       if (write(fd, buf, size) < size) {
+               Perror(LOG_ERR, "write: %m");
+               exit(1);
+       }
+}
+
+log(level, msg, a1, a2)
+       int level;
+       char *msg;
+{
+
+       fprintf(stderr, msg, a1, a2);
+       syslog(level, msg, a1, a2);
+}
+
+Perror(level, msg, s)
+       int level;
+       char *msg;
+{
+       int oerrno = errno;
+       
+       perror(s);
+       errno = oerrno;
+       syslog(level, msg, s);

 }
 }