6 Evolved over several years, starting with the initial
7 SMARTALLOC code for AutoSketch in 1986, guided by the Blind
8 Watchbreaker, John Walker. Isolated in this general-purpose
9 form in September of 1989. Updated with be more POSIX
10 compliant and to include Web-friendly HTML documentation in
11 October of 1998 by the same culprit. For additional
12 information and the current version visit the Web page:
14 http://www.fourmilab.ch/smartall/
22 Copyright (C) 2000-2003 Kern Sibbald and John Walker
24 This program is free software; you can redistribute it and/or
25 modify it under the terms of the GNU General Public License as
26 published by the Free Software Foundation; either version 2 of
27 the License, or (at your option) any later version.
29 This program is distributed in the hope that it will be useful,
30 but WITHOUT ANY WARRANTY; without even the implied warranty of
31 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
32 General Public License for more details.
34 You should have received a copy of the GNU General Public
35 License along with this program; if not, write to the Free
36 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
42 /* Use the real routines here */
52 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
54 extern char my_name[]; /* daemon name */
56 typedef unsigned short sm_ushort;
58 #define EOS '\0' /* End of string sentinel */
59 #define sm_min(a, b) ((a) < (b) ? (a) : (b))
61 /* Queue data structures */
63 /* Memory allocation control structures and storage. */
66 struct b_queue abq; /* Links on allocated queue */
67 unsigned ablen; /* Buffer length in bytes */
68 char *abfname; /* File name pointer */
69 sm_ushort ablineno; /* Line number of allocation */
72 static struct b_queue abqueue = { /* Allocated buffer queue */
76 static Boolean bufimode = False; /* Buffers not tracked when True */
78 #define HEAD_SIZE BALIGN(sizeof(struct abufhead))
81 /* SMALLOC -- Allocate buffer, enqueing on the orphaned buffer
84 static void *smalloc(char *fname, int lineno, unsigned int nbytes)
88 /* Note: Unix MALLOC actually permits a zero length to be
89 passed and allocates a valid block with zero user bytes.
90 Such a block can later be expanded with realloc(). We
91 disallow this based on the belief that it's better to make
92 a special case and allocate one byte in the rare case this
93 is desired than to miss all the erroneous occurrences where
94 buffer length calculation code results in a zero. */
98 nbytes += HEAD_SIZE + 1;
99 if ((buf = (char *)malloc(nbytes)) != NULL) {
101 /* Enqueue buffer on allocated list */
102 qinsert(&abqueue, (struct b_queue *) buf);
103 ((struct abufhead *) buf)->ablen = nbytes;
104 ((struct abufhead *) buf)->abfname = bufimode ? NULL : fname;
105 ((struct abufhead *) buf)->ablineno = (sm_ushort) lineno;
106 /* Emplace end-clobber detector at end of buffer */
107 buf[nbytes - 1] = (((long) buf) & 0xFF) ^ 0xC5;
108 buf += HEAD_SIZE; /* Increment to user data start */
111 sm_check(fname, lineno, True);
112 Dmsg4(1150, "smalloc %d at %x from %s:%d\n", nbytes, buf, fname, lineno);
116 /* SM_NEW_OWNER -- Update the File and line number for a buffer
117 This is to accomodate mem_pool. */
119 void sm_new_owner(char *fname, int lineno, char *buf)
121 buf -= HEAD_SIZE; /* Decrement to header */
122 ((struct abufhead *)buf)->abfname = bufimode ? NULL : fname;
123 ((struct abufhead *)buf)->ablineno = (sm_ushort) lineno;
127 /* SM_FREE -- Update free pool availability. FREE is never called
128 except through this interface or by actuallyfree().
129 free(x) is defined to generate a call to this
132 void sm_free(char *file, int line, void *fp)
134 char *cp = (char *) fp;
137 sm_check(__FILE__, __LINE__, True);
139 Emsg2(M_ABORT, 0, "Attempt to free NULL called from %s:%d\n", file, line);
143 qp = (struct b_queue *) cp;
146 Dmsg4(1150, "sm_free %d at %x from %s:%d\n",
147 ((struct abufhead *)cp)->ablen, fp,
148 ((struct abufhead *)cp)->abfname, ((struct abufhead *)cp)->ablineno);
150 /* The following assertions will catch virtually every release
151 of an address which isn't an allocated buffer. */
152 if (qp->qnext->qprev != qp) {
154 Emsg2(M_ABORT, 0, "qp->qnext->qprev != qp called from %s:%d\n", file, line);
156 if (qp->qprev->qnext != qp) {
158 Emsg2(M_ABORT, 0, "qp->qprev->qnext != qp called from %s:%d\n", file, line);
161 /* The following assertion detects storing off the end of the
162 allocated space in the buffer by comparing the end of buffer
163 checksum with the address of the buffer. */
165 if (((unsigned char *) cp)[((struct abufhead *) cp)->ablen - 1] !=
166 ((((long) cp) & 0xFF) ^ 0xC5)) {
168 Emsg2(M_ABORT, 0, "Buffer overrun called from %s:%d\n", file, line);
175 /* Now we wipe the contents of the just-released buffer with
176 "designer garbage" (Duff Kurland's phrase) of alternating
177 bits. This is intended to ruin the day for any miscreant who
178 attempts to access data through a pointer into storage that's
179 been previously released. */
181 memset(cp, 0xAA, (int) ((struct abufhead *) cp)->ablen);
186 /* SM_MALLOC -- Allocate buffer. NULL is returned if no memory
189 void *sm_malloc(char *fname, int lineno, unsigned int nbytes)
193 if ((buf = smalloc(fname, lineno, nbytes)) != NULL) {
195 /* To catch sloppy code that assumes buffers obtained from
196 malloc() are zeroed, we preset the buffer contents to
197 "designer garbage" consisting of alternating bits. */
199 memset(buf, 0x55, (int) nbytes);
204 /* SM_CALLOC -- Allocate an array and clear it to zero. */
206 void *sm_calloc(char *fname, int lineno,
207 unsigned int nelem, unsigned int elsize)
211 if ((buf = smalloc(fname, lineno, nelem * elsize)) != NULL) {
212 memset(buf, 0, (int) (nelem * elsize));
217 /* SM_REALLOC -- Adjust the size of a previously allocated buffer.
218 Note that the trick of "resurrecting" a previously
219 freed buffer with realloc() is NOT supported by this
220 function. Further, because of the need to maintain
221 our control storage, SM_REALLOC must always allocate
222 a new block and copy the data in the old block.
223 This may result in programs which make heavy use of
224 realloc() running much slower than normally. */
226 void *sm_realloc(char *fname, int lineno, void *ptr, unsigned int size)
230 char *cp = (char *) ptr;
232 Dmsg4(400, "sm_realloc %s:%d 0x%x %d\n", fname, lineno, ptr, size);
233 sm_check(fname, lineno, True);
235 e_msg(fname, lineno, M_ABORT, 0, "sm_realloc size: %d\n", size);
238 /* If the old block pointer is NULL, treat realloc() as a
239 malloc(). SVID is silent on this, but many C libraries
243 return sm_malloc(fname, lineno, size);
245 /* If the old and new sizes are the same, be a nice guy and just
246 return the buffer passed in. */
249 osize = ((struct abufhead *) cp)->ablen - (HEAD_SIZE + 1);
254 /* Sizes differ. Allocate a new buffer of the requested size.
255 If we can't obtain such a buffer, act as defined in SVID:
256 return NULL from realloc() and leave the buffer in PTR
259 if ((buf = smalloc(fname, lineno, size)) != NULL) {
260 memcpy(buf, ptr, (int) sm_min(size, osize));
261 /* If the new buffer is larger than the old, fill the balance
262 of it with "designer garbage". */
264 memset(((char *) buf) + osize, 0x55, (int) (size - osize));
267 /* All done. Free and dechain the original buffer. */
269 sm_free(__FILE__, __LINE__, ptr);
271 Dmsg4(150, "sm_realloc %d at %x from %s:%d\n", size, buf, fname, lineno);
272 sm_check(fname, lineno, True);
276 /* ACTUALLYMALLOC -- Call the system malloc() function to obtain
277 storage which will eventually be released
278 by system or library routines not compiled
281 void *actuallymalloc(unsigned int size)
286 /* ACTUALLYCALLOC -- Call the system calloc() function to obtain
287 storage which will eventually be released
288 by system or library routines not compiled
291 void *actuallycalloc(unsigned int nelem, unsigned int elsize)
293 return calloc(nelem, elsize);
296 /* ACTUALLYREALLOC -- Call the system realloc() function to obtain
297 storage which will eventually be released
298 by system or library routines not compiled
301 void *actuallyrealloc(void *ptr, unsigned int size)
303 Dmsg2(400, "Actuallyrealloc 0x%x %d\n", ptr, size);
304 return realloc(ptr, size);
307 /* ACTUALLYFREE -- Interface to system free() function to release
308 buffers allocated by low-level routines. */
310 void actuallyfree(void *cp)
315 /* SM_DUMP -- Print orphaned buffers (and dump them if BUFDUMP is
317 * N.B. DO NOT USE any Bacula print routines (Dmsg, Jmsg, Emsg, ...)
318 * as they have all been shut down at this point.
320 void sm_dump(Boolean bufdump)
326 ap = (struct abufhead *)abqueue.qnext;
328 while (ap != (struct abufhead *) &abqueue) {
331 (ap->abq.qnext->qprev != (struct b_queue *) ap) ||
332 (ap->abq.qprev->qnext != (struct b_queue *) ap)) {
334 "\nOrphaned buffers exist. Dump terminated following\n");
336 " discovery of bad links in chain of orphaned buffers.\n");
338 " Buffer address with bad links: %lx\n", (long) ap);
342 if (ap->abfname != NULL) {
343 unsigned memsize = ap->ablen - (HEAD_SIZE + 1);
347 "Orphaned buffer: %6u bytes allocated at line %d of %s %s\n",
348 memsize, ap->ablineno, my_name, ap->abfname
350 fprintf(stderr, "%s", errmsg);
353 char *cp = ((char *) ap) + HEAD_SIZE;
358 strcat(errmsg, "\n");
360 fprintf(stderr, "%s", errmsg);
363 sprintf(errmsg + strlen(errmsg), " %02X",
368 fprintf(stderr, "%s\n", errmsg);
371 ap = (struct abufhead *) ap->abq.qnext;
377 /* SM_CHECK -- Check the buffers and dump if any damage exists. */
378 void sm_check(char *fname, int lineno, Boolean bufdump)
380 if (!sm_check_rtn(fname, lineno, bufdump)) {
381 Emsg2(M_ABORT, 0, "Damaged buffer found. Called from %s:%d\n",
387 /* SM_CHECK_RTN -- Check the buffers and return 1 if OK otherwise 0 */
388 int sm_check_rtn(char *fname, int lineno, Boolean bufdump)
394 ap = (struct abufhead *) abqueue.qnext;
395 while (ap != (struct abufhead *) &abqueue) {
398 (ap->abq.qnext->qprev != (struct b_queue *) ap)) {
401 if (ap->abq.qprev->qnext != (struct b_queue *) ap) {
404 if (((unsigned char *) ap)[((struct abufhead *) ap)->ablen - 1] !=
405 ((((long) ap) & 0xFF) ^ 0xC5)) {
411 "\nDamaged buffers found at %s:%d\n", fname, lineno);
414 fprintf(stderr, " discovery of bad prev link.\n");
417 fprintf(stderr, " discovery of bad next link.\n");
420 fprintf(stderr, " discovery of data overrun.\n");
423 fprintf(stderr, " Buffer address: %lx\n", (long) ap);
425 if (ap->abfname != NULL) {
426 unsigned memsize = ap->ablen - (HEAD_SIZE + 1);
430 "Damaged buffer: %6u bytes allocated at line %d of %s %s\n",
431 memsize, ap->ablineno, my_name, ap->abfname
435 char *cp = ((char *) ap) + HEAD_SIZE;
440 strcat(errmsg, "\n");
442 fprintf(stderr, "%s", errmsg);
446 sprintf(errmsg + strlen(errmsg), " %02X",
449 sprintf(errmsg + strlen(errmsg), " %c ",
455 fprintf(stderr, "%s\n", errmsg);
459 ap = (struct abufhead *) ap->abq.qnext;
462 return badbuf ? 0 : 1;
466 /* SM_STATIC -- Orphaned buffer detection can be disabled (for such
467 items as buffers allocated during initialisation) by
468 calling sm_static(1). Normal orphaned buffer
469 detection can be re-enabled with sm_static(0). Note
470 that all the other safeguards still apply to buffers
471 allocated when sm_static(1) mode is in effect. */
473 void sm_static(int mode)
475 bufimode = (Boolean) (mode != 0);