* dlmalloc.c: New file. Port of Doug Lea's malloc

* dlmalloc.h: Ditto.
* Makefile.in: Add support for MALLOC_DEBUG
* config.h.in: Ditto.
* winsup.h: Ditto.
* configure.in: Add --enable-malloc-debugging option.
* configure: Regenerate.
* debug.h: Include declarations for debugging malloc.
* tty.cc (grantpt): Fix definition.
(unlockpt): Ditto.

winsup/cygwin/dlmalloc.h

@@ -0,0 +1,96 @@
+
+/*
+ * Header file for BBCized version of Doug Lea's malloc.c, automatically
+ * generated by
+ *  /source/prod/libbbc/compat/dlmalloc/cvt
+ * from
+ *  /source/prod/libbbc/compat/dlmalloc/malloc.c
+ *
+ * bbclabel: autogenerated
+ */
+
+void malloc_outofmem(void (*)(void));
+
+
+struct mallinfo {
+  int arena;    /* total space allocated from system */
+  int ordblks;  /* number of non-inuse chunks */
+  int smblks;   /* unused -- always zero */
+  int hblks;    /* number of mmapped regions */
+  int hblkhd;   /* total space in mmapped regions */
+  int usmblks;  /* unused -- always zero */
+  int fsmblks;  /* unused -- always zero */
+  int uordblks; /* total allocated space */
+  int fordblks; /* total non-inuse space */
+  int keepcost; /* top-most, releasable (via malloc_trim) space */
+};
+
+
+#define M_MXFAST  1    /* UNUSED in this malloc */
+#define M_NLBLKS  2    /* UNUSED in this malloc */
+#define M_GRAIN   3    /* UNUSED in this malloc */
+#define M_KEEP    4    /* UNUSED in this malloc */
+
+
+#define M_TRIM_THRESHOLD    -1
+#define M_TOP_PAD           -2
+#define M_MMAP_THRESHOLD    -3
+#define M_MMAP_MAX          -4
+#define M_SCANHEAP	    -5
+#define M_FILL
+
+#ifdef MALLOC_DEBUG
+
+#define malloc(size)		malloc_dbg(size, __FILE__, __LINE__)
+#define free(p)			free_dbg(p, __FILE__, __LINE__)
+#define realloc(p, size)	realloc_dbg(p, size, __FILE__, __LINE__)
+#define calloc(n, size)		calloc_dbg(n, size, __FILE__, __LINE__)
+#define memalign(align, size)	memalign_dbg(align, size, __FILE__, __LINE__)
+#define valloc(size)		valloc_dbg(size, __FILE__, __LINE__)
+#define pvalloc(size)		pvalloc_dbg(size, __FILE__, __LINE__)
+#define cfree(p)		cfree_dbg(p, __FILE__, __LINE__)
+#define malloc_trim(pad)	malloc_trim_dbg(pad, __FILE__, __LINE__)
+#define malloc_usable_size(p)	malloc_usable_size_dbg(p, __FILE__, __LINE__)
+#define malloc_stats()		malloc_stats_dbg(__FILE__, __LINE__)
+#define mallopt(flag, val)	mallopt_dbg(flag, val, __FILE__, __LINE__)
+#define mallinfo()		mallinfo_dbg(__FILE__, __LINE__)
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void* malloc_dbg(size_t, const char *, int);
+void    free_dbg(void*, const char *, int);
+void* realloc_dbg(void*, size_t, const char *, int);
+void* calloc_dbg(size_t, size_t, const char *, int);
+void* memalign_dbg(size_t, size_t, const char *, int);
+void* valloc_dbg(size_t, const char *, int);
+void* pvalloc_dbg(size_t, const char *, int);
+void    cfree_dbg(void*, const char *, int);
+int     malloc_trim_dbg(size_t, const char *, int);
+size_t  malloc_usable_size_dbg(void*, const char *, int);
+void    malloc_stats_dbg(const char *, int);
+int     mallopt_dbg(int, int, const char *, int);
+struct mallinfo mallinfo_dbg(const char *, int);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* MALLOC_DEBUG */
+
+#ifndef MALLOC_DEBUG
+
+void* malloc(size_t);
+void    free(void*);
+void* realloc(void*, size_t);
+void* calloc(size_t, size_t);
+void* memalign(size_t, size_t);
+void* valloc(size_t);
+void* pvalloc(size_t);
+void    cfree(void*);
+int     malloc_trim(size_t);
+size_t  malloc_usable_size(void*);
+void    malloc_stats(void);
+int     mallopt(int, int);
+struct mallinfo mallinfo(void);
+#endif /* !MALLOC_DEBUG */