newlib/winsup/cygwin/cygheap.cc

453 lines
11 KiB
C++

/* cygheap.cc: Cygwin heap manager.
Copyright 2000, 2001, 2002, 2003 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygerrno.h"
#include "cygheap.h"
#include "child_info.h"
#include "heap.h"
#include "sync.h"
#include "shared_info.h"
#include "sigproc.h"
init_cygheap NO_COPY *cygheap;
void NO_COPY *cygheap_max;
static NO_COPY muto *cygheap_protect;
struct cygheap_entry
{
int type;
struct cygheap_entry *next;
char data[0];
};
#define NBUCKETS (sizeof (cygheap->buckets) / sizeof (cygheap->buckets[0]))
#define N0 ((_cmalloc_entry *) NULL)
#define to_cmalloc(s) ((_cmalloc_entry *) (((char *) (s)) - (unsigned) (N0->data)))
#define CFMAP_OPTIONS (SEC_RESERVE | PAGE_READWRITE)
#define MVMAP_OPTIONS (FILE_MAP_WRITE)
extern "C" {
static void __stdcall _cfree (void *ptr) __attribute__((regparm(1)));
}
static void
init_cheap ()
{
cygheap = (init_cygheap *) VirtualAlloc ((void *) &_cygheap_start, CYGHEAPSIZE, MEM_RESERVE, PAGE_NOACCESS);
if (!cygheap)
{
MEMORY_BASIC_INFORMATION m;
if (!VirtualQuery ((LPCVOID) &_cygheap_start, &m, sizeof m))
system_printf ("couldn't get memory info, %E");
system_printf ("Couldn't reserve space for cygwin's heap, %E");
api_fatal ("AllocationBase %p, BaseAddress %p, RegionSize %p, State %p\n",
m.AllocationBase, m.BaseAddress, m.RegionSize, m.State);
}
cygheap_max = cygheap;
}
static void dup_now (void *, child_info *, unsigned) __attribute__ ((regparm(3)));
static void
dup_now (void *newcygheap, child_info *ci, unsigned n)
{
if (!VirtualAlloc (newcygheap, n, MEM_COMMIT, PAGE_READWRITE))
api_fatal ("couldn't allocate new cygwin heap %p, %d for child, %E",
newcygheap, n);
memcpy (newcygheap, cygheap, n);
}
void *__stdcall
cygheap_setup_for_child (child_info *ci, bool dup_later)
{
void *newcygheap;
cygheap_protect->acquire ();
unsigned n = (char *) cygheap_max - (char *) cygheap;
unsigned size = CYGHEAPSIZE;
if (size < n)
size = n + (128 * 1024);
ci->cygheap_h = CreateFileMapping (INVALID_HANDLE_VALUE, &sec_none,
CFMAP_OPTIONS, 0, size, NULL);
if (!ci->cygheap_h)
api_fatal ("Couldn't create heap for child, size %d, %E", CYGHEAPSIZE);
newcygheap = MapViewOfFileEx (ci->cygheap_h, MVMAP_OPTIONS, 0, 0, 0, NULL);
ProtectHandle1INH (ci->cygheap_h, passed_cygheap_h);
if (!dup_later)
dup_now (newcygheap, ci, n);
cygheap_protect->release ();
ci->cygheap = cygheap;
ci->cygheap_max = cygheap_max;
return newcygheap;
}
void __stdcall
cygheap_setup_for_child_cleanup (void *newcygheap, child_info *ci,
bool dup_it_now)
{
if (dup_it_now)
{
/* NOTE: There is an assumption here that cygheap_max has not changed
between the time that cygheap_setup_for_child was called and now.
Make sure that this is a correct assumption. */
cygheap_protect->acquire ();
dup_now (newcygheap, ci, (char *) cygheap_max - (char *) cygheap);
cygheap_protect->release ();
}
UnmapViewOfFile (newcygheap);
ForceCloseHandle1 (ci->cygheap_h, passed_cygheap_h);
}
/* Called by fork or spawn to reallocate cygwin heap */
void __stdcall
cygheap_fixup_in_child (bool execed)
{
cygheap = child_proc_info->cygheap;
cygheap_max = child_proc_info->cygheap_max;
void *addr = !wincap.map_view_of_file_ex_sucks () ? cygheap : NULL;
void *newaddr;
newaddr = MapViewOfFileEx (child_proc_info->cygheap_h, MVMAP_OPTIONS, 0, 0, 0, addr);
if (newaddr != cygheap)
{
if (!newaddr)
newaddr = MapViewOfFileEx (child_proc_info->cygheap_h, MVMAP_OPTIONS, 0, 0, 0, NULL);
DWORD n = (DWORD) cygheap_max - (DWORD) cygheap;
/* Reserve cygwin heap in same spot as parent */
if (!VirtualAlloc (cygheap, CYGHEAPSIZE, MEM_RESERVE, PAGE_NOACCESS))
{
MEMORY_BASIC_INFORMATION m;
memset (&m, 0, sizeof m);
if (!VirtualQuery ((LPCVOID) cygheap, &m, sizeof m))
system_printf ("couldn't get memory info, %E");
system_printf ("Couldn't reserve space for cygwin's heap (%p <%p>) in child, %E", cygheap, newaddr);
api_fatal ("m.AllocationBase %p, m.BaseAddress %p, m.RegionSize %p, m.State %p\n",
m.AllocationBase, m.BaseAddress, m.RegionSize, m.State);
}
/* Allocate same amount of memory as parent */
if (!VirtualAlloc (cygheap, n, MEM_COMMIT, PAGE_READWRITE))
api_fatal ("Couldn't allocate space for child's heap %p, size %d, %E",
cygheap, n);
memcpy (cygheap, newaddr, n);
UnmapViewOfFile (newaddr);
}
ForceCloseHandle1 (child_proc_info->cygheap_h, passed_cygheap_h);
cygheap_init ();
debug_fixup_after_fork_exec ();
if (execed)
{
cygheap->user_heap.base = NULL; /* We can allocate the heap anywhere */
/* Walk the allocated memory chain looking for orphaned memory from
previous execs */
for (_cmalloc_entry *rvc = cygheap->chain; rvc; rvc = rvc->prev)
{
cygheap_entry *ce = (cygheap_entry *) rvc->data;
if (!rvc->ptr || rvc->b >= NBUCKETS || ce->type <= HEAP_1_START)
continue;
else if (ce->type < HEAP_1_MAX)
ce->type += HEAP_1_MAX; /* Mark for freeing after next exec */
else
_cfree (ce); /* Marked by parent for freeing in child */
}
}
}
#define pagetrunc(x) ((void *) (((DWORD) (x)) & ~(4096 - 1)))
static void *__stdcall
_csbrk (int sbs)
{
void *prebrk = cygheap_max;
void *prebrka = pagetrunc (prebrk);
cygheap_max = (char *) cygheap_max + sbs;
if (!sbs || (prebrk != prebrka && prebrka == pagetrunc (cygheap_max)))
/* nothing to do */;
else if (!VirtualAlloc (prebrk, (DWORD) sbs, MEM_COMMIT, PAGE_READWRITE))
{
malloc_printf ("couldn't commit memory for cygwin heap, %E");
__seterrno ();
cygheap_max = (char *) cygheap_max - sbs;
return NULL;
}
return prebrk;
}
extern "C" void __stdcall
cygheap_init ()
{
new_muto (cygheap_protect);
if (!cygheap)
{
init_cheap ();
(void) _csbrk (sizeof (*cygheap));
}
if (!cygheap->fdtab)
cygheap->fdtab.init ();
if (!cygheap->sigs)
sigalloc ();
if (!cygheap->shared_prefix)
cygheap->shared_prefix = cstrdup (
wincap.has_terminal_services ()
&& (set_process_privilege (SE_CREATE_GLOBAL_NAME, true) >= 0
|| GetLastError () == ERROR_NO_SUCH_PRIVILEGE)
? "Global\\" : "");
}
/* Copyright (C) 1997, 2000 DJ Delorie */
static void *_cmalloc (unsigned size) __attribute ((regparm(1)));
static void *__stdcall _crealloc (void *ptr, unsigned size) __attribute ((regparm(2)));
static void *__stdcall
_cmalloc (unsigned size)
{
_cmalloc_entry *rvc;
unsigned b, sz;
/* Calculate "bit bucket" and size as a power of two. */
for (b = 3, sz = 8; sz && sz < size; b++, sz <<= 1)
continue;
cygheap_protect->acquire ();
if (cygheap->buckets[b])
{
rvc = (_cmalloc_entry *) cygheap->buckets[b];
cygheap->buckets[b] = rvc->ptr;
rvc->b = b;
}
else
{
rvc = (_cmalloc_entry *) _csbrk (sz + sizeof (_cmalloc_entry));
if (!rvc)
{
cygheap_protect->release ();
return NULL;
}
rvc->b = b;
rvc->prev = cygheap->chain;
cygheap->chain = rvc;
}
cygheap_protect->release ();
return rvc->data;
}
static void __stdcall
_cfree (void *ptr)
{
cygheap_protect->acquire ();
_cmalloc_entry *rvc = to_cmalloc (ptr);
DWORD b = rvc->b;
rvc->ptr = cygheap->buckets[b];
cygheap->buckets[b] = (char *) rvc;
cygheap_protect->release ();
}
static void *__stdcall
_crealloc (void *ptr, unsigned size)
{
void *newptr;
if (ptr == NULL)
newptr = _cmalloc (size);
else
{
unsigned oldsize = 1 << to_cmalloc (ptr)->b;
if (size <= oldsize)
return ptr;
newptr = _cmalloc (size);
memcpy (newptr, ptr, oldsize);
_cfree (ptr);
}
return newptr;
}
/* End Copyright (C) 1997 DJ Delorie */
#define sizeof_cygheap(n) ((n) + sizeof (cygheap_entry))
#define N ((cygheap_entry *) NULL)
#define tocygheap(s) ((cygheap_entry *) (((char *) (s)) - (int) (N->data)))
inline static void *
creturn (cygheap_types x, cygheap_entry * c, unsigned len)
{
if (!c)
{
set_errno (ENOMEM);
return NULL;
}
c->type = x;
char *cend = ((char *) c + sizeof (*c) + len);
if (cygheap_max < cend)
cygheap_max = cend;
MALLOC_CHECK;
return (void *) c->data;
}
extern "C" void *__stdcall
cmalloc (cygheap_types x, DWORD n)
{
cygheap_entry *c;
MALLOC_CHECK;
c = (cygheap_entry *) _cmalloc (sizeof_cygheap (n));
if (!c)
system_printf ("cmalloc returned NULL");
return creturn (x, c, n);
}
extern "C" void *__stdcall
crealloc (void *s, DWORD n)
{
MALLOC_CHECK;
if (s == NULL)
return cmalloc (HEAP_STR, n); // kludge
assert (!inheap (s));
cygheap_entry *c = tocygheap (s);
cygheap_types t = (cygheap_types) c->type;
c = (cygheap_entry *) _crealloc (c, sizeof_cygheap (n));
if (!c)
system_printf ("crealloc returned NULL");
return creturn (t, c, n);
}
extern "C" void __stdcall
cfree (void *s)
{
assert (!inheap (s));
(void) _cfree (tocygheap (s));
MALLOC_CHECK;
}
extern "C" void __stdcall
cfree_and_set (char *&s, char *what)
{
if (s && s != almost_null)
cfree (s);
s = what;
}
extern "C" void *__stdcall
ccalloc (cygheap_types x, DWORD n, DWORD size)
{
cygheap_entry *c;
MALLOC_CHECK;
n *= size;
c = (cygheap_entry *) _cmalloc (sizeof_cygheap (n));
if (c)
memset (c->data, 0, n);
#ifdef DEBUGGING
if (!c)
system_printf ("ccalloc returned NULL");
#endif
return creturn (x, c, n);
}
extern "C" char *__stdcall
cstrdup (const char *s)
{
MALLOC_CHECK;
char *p = (char *) cmalloc (HEAP_STR, strlen (s) + 1);
if (!p)
return NULL;
strcpy (p, s);
MALLOC_CHECK;
return p;
}
extern "C" char *__stdcall
cstrdup1 (const char *s)
{
MALLOC_CHECK;
char *p = (char *) cmalloc (HEAP_1_STR, strlen (s) + 1);
if (!p)
return NULL;
strcpy (p, s);
MALLOC_CHECK;
return p;
}
void
cygheap_root::set (const char *posix, const char *native)
{
if (*posix == '/' && posix[1] == '\0')
{
if (m)
{
cfree (m);
m = NULL;
}
return;
}
if (!m)
m = (struct cygheap_root_mount_info *) ccalloc (HEAP_MOUNT, 1, sizeof (*m));
strcpy (m->posix_path, posix);
m->posix_pathlen = strlen (posix);
if (m->posix_pathlen >= 1 && m->posix_path[m->posix_pathlen - 1] == '/')
m->posix_path[--m->posix_pathlen] = '\0';
strcpy (m->native_path, native);
m->native_pathlen = strlen (native);
if (m->native_pathlen >= 1 && m->native_path[m->native_pathlen - 1] == '\\')
m->native_path[--m->native_pathlen] = '\0';
}
cygheap_user::~cygheap_user ()
{
#if 0
if (pname)
cfree (pname);
if (plogsrv)
cfree (plogsrv - 2);
if (pdomain)
cfree (pdomain);
if (psid)
cfree (psid);
#endif
}
void
cygheap_user::set_name (const char *new_name)
{
bool allocated = !!pname;
if (allocated)
{
if (strcasematch (new_name, pname))
return;
cfree (pname);
}
pname = cstrdup (new_name ? new_name : "");
if (!allocated)
return; /* Initializing. Don't bother with other stuff. */
cfree_and_set (homedrive);
cfree_and_set (homepath);
cfree_and_set (plogsrv);
cfree_and_set (pdomain);
cfree_and_set (pwinname);
}