newlib-cygwin/winsup/cygwin/heap.cc

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/* heap.cc: Cygwin heap manager.
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Copyright 1996, 1997, 1998, 1999, 2000, 2001 Red Hat, Inc.
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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 <errno.h>
#include "cygerrno.h"
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
* Makefile.in: Add cygheap.o. * child_info.h: Add specific exec class. * cygheap.h: New file. Contains declarations for cygwin heap. * cygheap.cc: New file. Implements cygwin heap functions. * dcrt0.cc (quoted): Simplify due to new method for passing arguments between cygwin programs. (alloc_stack_hard_way): Attempt to handle overlapped stack. (dll_crt0_1): Move child_info processing here. Accomodate new method for passing arguments between cygwin programs. Initialize cygwin heap. Establish __argc and __argv variables. (_dll_crt0): Move most of child_info processing to dll_crt0_1. (cygwin_dll_init): Remove duplication. * dtable.cc (dtable::extend): Allocate dtable using cygwin heap. (dtable::build_fhandler): Ditto for fhandler type being constructed. (dtable::dup_worker): Free new fhandler from cygwin heap on error. (dtable::select_*): Don't assume that this == fdtab. (dtable::linearize_fd_array): Delete. (dtable::delinearize_fd_array): Delete. (dtable::fixup_after_exec): New file. (dtable::vfork_child_dup): Use cygwin heap. (dtable::vfork_parent_restore): Ditto. * dtable.h: Remove obsolete methods. Add new method. * environ.cc (posify): Eliminate already_posix parameter and logic. (envsize): New function. (_addenv): Use envsize. (environ_init): Accept an argument pointing to an existing environment list. If supplied, allocate space for this in the the program's heap. * fhandler.cc (fhandler_base::operator =): Move here from fhandler.h. Use cygwin heap to allocate filenames. (fhandler_base::set_name): Allocate/free names from cygwin heap. (fhandler_base::linearize): Delete. (fhandler_base::de_linearize): Delete. (fhandler_base::operator delete): Free from cygwin heap. (fhandler_base::~fhandler_base): Ditto. * fhandler.h: Accomodate elimination of *linearize and other changes above. * fhandler_console.cc (fhandler_console::fixup_after_exec): Rename from de_linearize. * heap.h: New file. * fhandler_tty.cc (fhandler_tty_slave::fhandler_tty_slave): Use cygwin heap for name. fhandler_tty::fixup_after_exec): Rename from de_linearize. * fork.cc (fork): Call cygheap_fixup_in_child. * heap.cc: Use declarations in heap.h. * malloc.cc: Sprinkle assertions throughout to catch attempts to free/realloc something from the cygwin heap. * path.cc: Throughout, eliminate use of per-thread cache for cwd. Use cwd_* functions rather than cwd_* variables to access cwd_win32 and cwd_posix. (cwd_win32): New function. (cwd_posix): New function. (cwd_hash): New function. (cwd_fixup_after_exec): New function. * path.h: Accomodate path.cc changes. * pinfo.cc (pinfo_init): Accept a pointer to an environment table. Pass this to environ_init. Eliminate old 'title' tests. * pinfo.h: Accomodate above change in argument. * spawn.cc (struct av): New method for building argv list. (av::unshift): New method. (spawn_guts): Allocate everything that the child process needs in the cygwin heap and pass a pointer to this to the child. Build argv list using new method. Eliminate delinearize stuff. * thread.h: Eliminate _cwd_win32 and _cwd_posix buffers. * winsup.h: Eliminate obsolete functions. Add envsize() declaration.
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#include "heap.h"
#include "shared_info.h"
#include "security.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
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#define assert(x)
static unsigned page_const;
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extern "C" size_t getpagesize ();
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/* Initialize the heap at process start up. */
void
heap_init ()
{
/* If we're the forkee, we must allocate the heap at exactly the same place
as our parent. If not, we don't care where it ends up. */
Throughout, change 'cygwin_shared.mount' to 'mount_table'. * child_info.h (child_info): Move shared_h, console_h to cygheap. Add mount_h. * cygheap.h (init_cygheap): Add shared_h, console_h. * cygheap.cc (init_cheap): Initialize heap at a fixed location after the shared memory regions. Initialize cygheap->user name here. * dcrt0.cc (dll_crt0_1): Call getpagesize () to initialize constants. Remove cygheap_init since it is done in shared_init now. (_dll_crt0): Initialize mount_h, remove shared_h and console_h initialization. * fhandler_console.cc (console_shared_h): Eliminate. (get_tty_stuff): Use cygheap->console_h rather than console_shared_h. * heap.cc (heap_init): Use page size constant calculated earlier in initialization. * shared.cc: Eliminate cygwin_shared_h. Add cygwin_mount_h. (mount_table_init): New function for initializing a user mount table. (open_shared_file_map): Use constant for shared memory region. Initialize cygheap and mount table here. (open_shared): Improve debugging output. (shared_info::initialize): Eliminate call to mount.init. (shared_terminate): Use cygheap->shared_h. Close cygwin_mount_h. (open_shared_file_map): Eliminate. * shared_info.h (mount_info): Add a version field. (shared_align_past): New macro for calculating location for shared memory regions. * sigproc.cc (init_child_info): Eliminate shared_h, console_h. * spawn.cc (spawn_guts): Pass on cygwin_mount_h iff not a different user. * syscalls.cc (system_info): New global holding system memory defaults. (getpagesize): Use system_info. * uinfo.cc (internal_getlogin): Only fill in user name if nonexistent. * winsup.h: Declare system_info. * passwd.cc (read_etc_passwd): Use cygheap->user.name () rather than retrieving the name again.
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page_const = system_info.dwPageSize;
if (cygheap->heapbase)
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{
DWORD chunk = cygwin_shared->heap_chunk_size (); /* allocation chunk */
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/* total size commited in parent */
DWORD allocsize = (char *) cygheap->heaptop - (char *) cygheap->heapbase;
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/* round up by chunk size */
DWORD reserve_size = chunk * ((allocsize + (chunk - 1)) / chunk);
/* Loop until we've managed to reserve an adequate amount of memory. */
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char *p;
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for (;;)
{
p = (char *) VirtualAlloc (cygheap->heapbase, reserve_size,
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MEM_RESERVE, PAGE_READWRITE);
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if (p)
break;
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if ((reserve_size -= page_const) <= allocsize)
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break;
}
if (p == NULL)
api_fatal ("1. unable to allocate heap %p, heap_chunk_size %d, pid %d, %E",
cygheap->heapbase, cygwin_shared->heap_chunk_size (), myself->pid);
if (p != cygheap->heapbase)
api_fatal ("heap allocated but not at %p", cygheap->heapbase);
if (! VirtualAlloc (cygheap->heapbase, allocsize, MEM_COMMIT, PAGE_READWRITE))
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api_fatal ("MEM_COMMIT failed, %E");
}
else
{
/* Initialize page mask and default heap size. Preallocate a heap
* to assure contiguous memory. */
cygheap->heapptr = cygheap->heaptop = cygheap->heapbase =
VirtualAlloc(NULL, cygwin_shared->heap_chunk_size (), MEM_RESERVE,
PAGE_NOACCESS);
if (cygheap->heapbase == NULL)
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api_fatal ("2. unable to allocate heap, heap_chunk_size %d, %E",
cygwin_shared->heap_chunk_size ());
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}
debug_printf ("heap base %p, heap top %p", cygheap->heapbase,
cygheap->heaptop);
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page_const--;
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malloc_init ();
}
#define pround(n) (((size_t)(n) + page_const) & ~page_const)
/* FIXME: This function no longer handles "split heaps". */
extern "C" void *
_sbrk(int n)
{
sigframe thisframe (mainthread);
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char *newtop, *newbrk;
unsigned commitbytes, newbrksize;
if (n == 0)
return cygheap->heapptr; /* Just wanted to find current cygheap->heapptr address */
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newbrk = (char *) cygheap->heapptr + n; /* Where new cygheap->heapptr will be */
newtop = (char *) pround (newbrk); /* Actual top of allocated memory -
on page boundary */
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if (newtop == cygheap->heaptop)
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goto good;
if (n < 0)
{ /* Freeing memory */
assert(newtop < cygheap->heaptop);
n = (char *) cygheap->heaptop - newtop;
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if (VirtualFree(newtop, n, MEM_DECOMMIT)) /* Give it back to OS */
goto good; /* Didn't take */
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else
goto err;
}
assert(newtop > cygheap->heaptop);
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/* Need to grab more pages from the OS. If this fails it may be because
* we have used up previously reserved memory. Or, we're just plumb out
* of memory. */
commitbytes = pround (newtop - (char *) cygheap->heaptop);
if (VirtualAlloc(cygheap->heaptop, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL)
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goto good;
/* Couldn't allocate memory. Maybe we can reserve some more.
Reserve either the maximum of the standard cygwin_shared->heap_chunk_size () or the requested
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amount. Then attempt to actually allocate it. */
if ((newbrksize = cygwin_shared->heap_chunk_size ()) < commitbytes)
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newbrksize = commitbytes;
if ((VirtualAlloc(cygheap->heaptop, newbrksize, MEM_RESERVE, PAGE_NOACCESS) != NULL) &&
(VirtualAlloc(cygheap->heaptop, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL))
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goto good;
err:
set_errno (ENOMEM);
return (void *) -1;
good:
void *oldbrk = cygheap->heapptr;
cygheap->heapptr = newbrk;
cygheap->heaptop = newtop;
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return oldbrk;
}