ss7m+@andrew.cmu.edu (Steven M. Stadnicki) (06/13/91)
Does anyone know where any librarys of this nature can be found? I've got a
lurking memory leak somewhere in the code I'm working with, and was hoping for
something that'll match mallocs and frees and tell me what I'm missing...
Steven Stadnicki
ss7m@andrew.cmu.edujtkohl@MIT.EDU (John T Kohl) (06/13/91)
I highly recommend the mprof package; a copy is on decwrl.dec.com somewhere. If you're using a DEC RISC box, I can send you some patches to improve some problems it used to have with static functions with missing symbol table entries. -- John Kohl <jtkohl@MIT.EDU> Digital Equipment Corporation/Project Athena (The above opinions are MINE. Don't put my words in somebody else's mouth!) ___This signature printed on recycled bits___ [not original; heard 2nd hand]
vandys@sequent.com (Andrew Valencia) (06/13/91)
ss7m+@andrew.cmu.edu (Steven M. Stadnicki) writes: >Does anyone know where any librarys of this nature can be found? I've got a >lurking memory leak somewhere in the code I'm working with, and was hoping for >something that'll match mallocs and frees and tell me what I'm missing... Well, I don't have quite that. But here's my malloc/free package for catching abuse of allocated and use of free'ed or realloc'd memory. Use at your own risk! It uses mmap() and munmap(), so you'll need a later vintage System V or BSD. Andy Valencia vandys@sequent.com /* * A brute-force malloc() interface which attempts to back up each * allocated piece of data against an invalid page, so that references * off the end cause a segmentation violation. */ extern char *sbrk(); static unsigned long pagesize; char * malloc(size) unsigned size; { static int setup = 0; unsigned long l; char *p; /* * Adjust up so we can slip a "size" word up front. Also pad by an * extra longword because the C library expects strings to not fall * into an invalid page within one word from their end. */ size += sizeof(unsigned) + sizeof(long); /* * Round size to longword boundary */ if (size & (sizeof(long)-1)) { size += (sizeof(long) - (size & (sizeof(long)-1))); } /* * Get some overhead over with once */ if (!setup) { pagesize = getpagesize(); setup = 1; } /* * Make sure break is on a page boundry */ l = (unsigned long)sbrk(0); l &= (pagesize-1); l = pagesize - l; (void)sbrk((int)l); /* * Now allocate one page beyond size needed to hold data */ l = (size + (pagesize-1)) & ~(pagesize-1); l = pagesize * (l/pagesize + 1); p = sbrk((int)l); /* * Out of memory--foo */ if (p == 0) return(p); /* * Unvirtualize last page, return pointer to data backed * up against top of remaining memory. */ p += l; (void) munmap(p - pagesize, pagesize); /* * Adjust data to back up against the end of the memory */ p -= (pagesize + size); *(unsigned *)p = size; return (p+sizeof(unsigned)); } /* * Free memory. Unvirtualize and thus catch stale-memory cheaters. */ void free(ptr) char *ptr; { unsigned long l; int npages; /* * Figure out how big a chunk we're done with */ ptr -= sizeof(unsigned); l = *(unsigned *)ptr; l = (l + (pagesize-1)) & ~(pagesize-1); npages = l/pagesize; /* * Get base of memory, unmap it */ l = (unsigned long)ptr; l &= ~(pagesize-1); (void) munmap(l, npages*pagesize); } char * realloc(ptr, size) char *ptr; unsigned size; { register char *p; unsigned osize; if ((p = malloc(size)) == 0) return(p); osize = *(unsigned *)(ptr - sizeof(unsigned)); memcpy(p, ptr, osize); free(ptr); return(p); }
ehrlich@cs.psu.edu (Dan Ehrlich) (06/15/91)
In article <wcJfUZu00WB40_POJc@andrew.cmu.edu> ss7m+@andrew.cmu.edu (Steven M. Stadnicki) writes: SMS> Does anyone know where any librarys of this nature can be found? I've got a SMS> lurking memory leak somewhere in the code I'm working with, and was hoping for SMS> something that'll match mallocs and frees and tell me what I'm missing... SMS> Steven Stadnicki SMS> ss7m@andrew.cmu.edu There is a debugging malloc that come with ZMailer 2.1. You can find it in the Zmailer distribution on ftp.cs.toronto.edu in pub/zmailer.tar.Z. >psuvax1:6> ftp ftp.cs.toronto.edu >Connected to ftp.cs.toronto.edu. >220 relay.cs.toronto.edu FTP server (Version 5.80 Fri Feb 1 17:12:21 EST 1991) ready. >331 Please give your email address as password. >230 Guest login ok, access restrictions apply. >ftp> cd pub >250 CWD command successful. >ftp> dir *zmail* >200 PORT command successful. >150 Opening ASCII mode data connection for /bin/ls. >-rw-r--r-- 1 917 10 1650 Jun 4 21:39 zmailer.Patch01 >-rw-r--r-- 1 7 10 2227 Jun 5 20:27 zmailer.Patch02 >-rw-r--r-- 1 0 10 7397 Jun 3 16:51 zmailer.README >-rw-r--r-- 1 0 0 1162209 Jun 5 20:15 zmailer.tar.Z >226 Transfer complete. >remote: *zmail* >281 bytes received in 0.01 seconds (27 Kbytes/s) >ftp> quit >221 Goodbye. -- Dan Ehrlich - Sr. Systems Programmer - Penn State Computer Science <ehrlich@cs.psu.edu>/Voice: +1 814 863 1142/FAX: +1 814 865 3176