415 lines
9.7 KiB
C++
415 lines
9.7 KiB
C++
/* cygheap.cc: Cygwin heap manager.
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Copyright 2000, 2001, 2002, 2003, 2004, 2005 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "child_info.h"
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#include "heap.h"
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#include "sync.h"
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#include "sigproc.h"
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#include "pinfo.h"
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#include <unistd.h>
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init_cygheap NO_COPY *cygheap;
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void NO_COPY *cygheap_max;
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extern "C" char _cygheap_mid[] __attribute__((section(".cygheap")));
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extern "C" char _cygheap_end[];
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static NO_COPY muto cygheap_protect;
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struct cygheap_entry
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{
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int type;
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struct cygheap_entry *next;
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char data[0];
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};
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#define NBUCKETS (sizeof (cygheap->buckets) / sizeof (cygheap->buckets[0]))
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#define N0 ((_cmalloc_entry *) NULL)
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#define to_cmalloc(s) ((_cmalloc_entry *) (((char *) (s)) - (unsigned) (N0->data)))
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#define CFMAP_OPTIONS (SEC_RESERVE | PAGE_READWRITE)
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#define MVMAP_OPTIONS (FILE_MAP_WRITE)
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extern "C" {
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static void __stdcall _cfree (void *) __attribute__((regparm(1)));
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static void *__stdcall _csbrk (int);
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}
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/* Called by fork or spawn to reallocate cygwin heap */
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void __stdcall
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cygheap_fixup_in_child (bool execed)
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{
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cygheap_max = child_proc_info->cygheap;
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cygheap = (init_cygheap *) cygheap_max;
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_csbrk ((char *) child_proc_info->cygheap_max - (char *) cygheap);
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child_copy (child_proc_info->parent, false, "cygheap", cygheap, cygheap_max, NULL);
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cygheap_init ();
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debug_fixup_after_fork_exec ();
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if (execed)
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{
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cygheap->hooks.next = NULL;
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cygheap->user_heap.base = NULL; /* We can allocate the heap anywhere */
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/* Walk the allocated memory chain looking for orphaned memory from
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previous execs */
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for (_cmalloc_entry *rvc = cygheap->chain; rvc; rvc = rvc->prev)
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{
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cygheap_entry *ce = (cygheap_entry *) rvc->data;
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if (!rvc->ptr || rvc->b >= NBUCKETS || ce->type <= HEAP_1_START)
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continue;
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else if (ce->type < HEAP_1_MAX)
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ce->type += HEAP_1_MAX; /* Mark for freeing after next exec */
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else
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_cfree (ce); /* Marked by parent for freeing in child */
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}
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}
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}
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int
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init_cygheap::manage_console_count (const char *something, int amount, bool avoid_freeing_console)
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{
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if (console_count == 0 && amount > 0)
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init_console_handler (true);
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console_count += amount;
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debug_printf ("%s: console_count %d, amount %d, %s, avoid_freeing_console %d",
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something, console_count, amount, myctty (), avoid_freeing_console);
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if (!avoid_freeing_console && amount <= 0 && !console_count && myself->ctty == -1)
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{
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BOOL res = FreeConsole ();
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debug_printf ("freed console, res %d", res);
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init_console_handler (false);
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}
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return console_count;
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}
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void
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init_cygheap::close_ctty ()
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{
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debug_printf ("closing cygheap->ctty %p", cygheap->ctty);
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cygheap->ctty->close ();
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cygheap->ctty = NULL;
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}
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#define nextpage(x) ((char *) (((DWORD) ((char *) x + granmask)) & ~granmask))
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#define allocsize(x) ((DWORD) nextpage (x))
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#ifdef DEBUGGING
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#define somekinda_printf debug_printf
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#else
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#define somekinda_printf malloc_printf
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#endif
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static void *__stdcall
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_csbrk (int sbs)
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{
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void *prebrk = cygheap_max;
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size_t granmask = getpagesize () - 1;
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char *newbase = nextpage (prebrk);
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cygheap_max = (char *) cygheap_max + sbs;
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if (!sbs || (newbase > cygheap_max) || (cygheap_max < _cygheap_end))
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/* nothing to do */;
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else
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{
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if (prebrk <= _cygheap_end)
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newbase = _cygheap_end;
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DWORD adjsbs = allocsize ((char *) cygheap_max - newbase);
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if (!VirtualAlloc (newbase, adjsbs, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE))
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{
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MEMORY_BASIC_INFORMATION m;
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if (!VirtualQuery (newbase, &m, sizeof m))
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system_printf ("couldn't get memory info, %E");
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somekinda_printf ("Couldn't reserve/commit %d bytes of space for cygwin's heap, %E",
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adjsbs);
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somekinda_printf ("AllocationBase %p, BaseAddress %p, RegionSize %p, State %p\n",
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m.AllocationBase, m.BaseAddress, m.RegionSize, m.State);
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__seterrno ();
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cygheap_max = (char *) cygheap_max - sbs;
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return NULL;
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}
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}
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return prebrk;
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}
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extern "C" void __stdcall
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cygheap_init ()
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{
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cygheap_protect.init ("cygheap_protect");
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if (!cygheap)
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{
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cygheap = (init_cygheap *) memset (_cygheap_start, 0, _cygheap_mid - _cygheap_start);
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cygheap_max = cygheap;
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_csbrk (sizeof (*cygheap));
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}
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if (!cygheap->fdtab)
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cygheap->fdtab.init ();
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if (!cygheap->sigs)
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sigalloc ();
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if (!cygheap->shared_prefix)
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cygheap->shared_prefix = cstrdup (
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wincap.has_terminal_services ()
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&& (set_privilege (hProcToken, SE_CREATE_GLOBAL_PRIV, true) >= 0
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|| GetLastError () == ERROR_NO_SUCH_PRIVILEGE)
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? "Global\\" : "");
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}
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/* Copyright (C) 1997, 2000 DJ Delorie */
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static void *_cmalloc (unsigned size) __attribute ((regparm(1)));
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static void *__stdcall _crealloc (void *ptr, unsigned size) __attribute ((regparm(2)));
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static void *__stdcall
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_cmalloc (unsigned size)
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{
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_cmalloc_entry *rvc;
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unsigned b, sz;
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/* Calculate "bit bucket" and size as a power of two. */
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for (b = 3, sz = 8; sz && sz < size; b++, sz <<= 1)
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continue;
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cygheap_protect.acquire ();
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if (cygheap->buckets[b])
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{
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rvc = (_cmalloc_entry *) cygheap->buckets[b];
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cygheap->buckets[b] = rvc->ptr;
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rvc->b = b;
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}
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else
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{
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rvc = (_cmalloc_entry *) _csbrk (sz + sizeof (_cmalloc_entry));
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if (!rvc)
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{
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cygheap_protect.release ();
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return NULL;
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}
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rvc->b = b;
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rvc->prev = cygheap->chain;
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cygheap->chain = rvc;
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}
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cygheap_protect.release ();
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return rvc->data;
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}
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static void __stdcall
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_cfree (void *ptr)
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{
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cygheap_protect.acquire ();
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_cmalloc_entry *rvc = to_cmalloc (ptr);
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DWORD b = rvc->b;
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rvc->ptr = cygheap->buckets[b];
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cygheap->buckets[b] = (char *) rvc;
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cygheap_protect.release ();
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}
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static void *__stdcall
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_crealloc (void *ptr, unsigned size)
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{
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void *newptr;
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if (ptr == NULL)
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newptr = _cmalloc (size);
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else
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{
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unsigned oldsize = 1 << to_cmalloc (ptr)->b;
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if (size <= oldsize)
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return ptr;
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newptr = _cmalloc (size);
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memcpy (newptr, ptr, oldsize);
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_cfree (ptr);
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}
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return newptr;
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}
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/* End Copyright (C) 1997 DJ Delorie */
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#define sizeof_cygheap(n) ((n) + sizeof (cygheap_entry))
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#define N ((cygheap_entry *) NULL)
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#define tocygheap(s) ((cygheap_entry *) (((char *) (s)) - (int) (N->data)))
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inline static void *
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creturn (cygheap_types x, cygheap_entry * c, unsigned len)
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{
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if (!c)
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{
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set_errno (ENOMEM);
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return NULL;
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}
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c->type = x;
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char *cend = ((char *) c + sizeof (*c) + len);
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if (cygheap_max < cend)
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cygheap_max = cend;
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MALLOC_CHECK;
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return (void *) c->data;
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}
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extern "C" void *__stdcall
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cmalloc (cygheap_types x, DWORD n)
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{
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cygheap_entry *c;
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MALLOC_CHECK;
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c = (cygheap_entry *) _cmalloc (sizeof_cygheap (n));
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if (!c)
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{
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#ifdef DEBUGGING
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system_printf ("cmalloc returned NULL");
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try_to_debug ();
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#endif
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}
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return creturn (x, c, n);
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}
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extern "C" void *__stdcall
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crealloc (void *s, DWORD n)
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{
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MALLOC_CHECK;
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if (s == NULL)
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return cmalloc (HEAP_STR, n); // kludge
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assert (!inheap (s));
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cygheap_entry *c = tocygheap (s);
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cygheap_types t = (cygheap_types) c->type;
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c = (cygheap_entry *) _crealloc (c, sizeof_cygheap (n));
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#ifdef DEBUGGING
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if (!c)
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system_printf ("crealloc returned NULL");
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#endif
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return creturn (t, c, n);
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}
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extern "C" void __stdcall
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cfree (void *s)
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{
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assert (!inheap (s));
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_cfree (tocygheap (s));
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MALLOC_CHECK;
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}
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extern "C" void __stdcall
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cfree_and_set (char *&s, char *what)
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{
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if (s && s != almost_null)
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cfree (s);
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s = what;
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}
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extern "C" void *__stdcall
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ccalloc (cygheap_types x, DWORD n, DWORD size)
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{
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cygheap_entry *c;
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MALLOC_CHECK;
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n *= size;
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c = (cygheap_entry *) _cmalloc (sizeof_cygheap (n));
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if (c)
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memset (c->data, 0, n);
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#ifdef DEBUGGING
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if (!c)
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system_printf ("ccalloc returned NULL");
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#endif
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return creturn (x, c, n);
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}
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extern "C" char *__stdcall
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cstrdup (const char *s)
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{
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MALLOC_CHECK;
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char *p = (char *) cmalloc (HEAP_STR, strlen (s) + 1);
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if (!p)
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return NULL;
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strcpy (p, s);
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MALLOC_CHECK;
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return p;
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}
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extern "C" char *__stdcall
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cstrdup1 (const char *s)
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{
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MALLOC_CHECK;
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char *p = (char *) cmalloc (HEAP_1_STR, strlen (s) + 1);
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if (!p)
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return NULL;
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strcpy (p, s);
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MALLOC_CHECK;
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return p;
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}
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void
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cygheap_root::set (const char *posix, const char *native)
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{
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if (*posix == '/' && posix[1] == '\0')
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{
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if (m)
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{
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cfree (m);
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m = NULL;
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}
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return;
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}
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if (!m)
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m = (struct cygheap_root_mount_info *) ccalloc (HEAP_MOUNT, 1, sizeof (*m));
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strcpy (m->posix_path, posix);
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m->posix_pathlen = strlen (posix);
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if (m->posix_pathlen >= 1 && m->posix_path[m->posix_pathlen - 1] == '/')
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m->posix_path[--m->posix_pathlen] = '\0';
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strcpy (m->native_path, native);
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m->native_pathlen = strlen (native);
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if (m->native_pathlen >= 1 && m->native_path[m->native_pathlen - 1] == '\\')
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m->native_path[--m->native_pathlen] = '\0';
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}
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cygheap_user::~cygheap_user ()
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{
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#if 0
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if (pname)
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cfree (pname);
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if (plogsrv)
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cfree (plogsrv - 2);
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if (pdomain)
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cfree (pdomain);
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if (psid)
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cfree (psid);
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#endif
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}
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void
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cygheap_user::set_name (const char *new_name)
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{
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bool allocated = !!pname;
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if (allocated)
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{
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if (strcasematch (new_name, pname))
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return;
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cfree (pname);
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}
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pname = cstrdup (new_name ? new_name : "");
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if (!allocated)
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return; /* Initializing. Don't bother with other stuff. */
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cfree_and_set (homedrive);
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cfree_and_set (homepath);
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cfree_and_set (plogsrv);
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cfree_and_set (pdomain);
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cfree_and_set (pwinname);
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}
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