newlib-cygwin/winsup/cygwin/cygheap.h

275 lines
6.7 KiB
C++

/* cygheap.h: Cygwin heap manager.
Copyright 2000, 2001, 2002 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. */
#undef cfree
enum cygheap_types
{
HEAP_FHANDLER,
HEAP_STR,
HEAP_ARGV,
HEAP_BUF,
HEAP_MOUNT,
HEAP_1_START,
HEAP_1_STR,
HEAP_1_ARGV,
HEAP_1_BUF,
HEAP_1_EXEC,
HEAP_1_MAX = 100
};
#define incygheap(s) (cygheap && ((char *) (s) >= (char *) cygheap) && ((char *) (s) <= ((char *) cygheap_max)))
struct _cmalloc_entry
{
union
{
DWORD b;
char *ptr;
};
struct _cmalloc_entry *prev;
char data[0];
};
struct cygheap_root_mount_info
{
char posix_path[MAX_PATH];
unsigned posix_pathlen;
char native_path[MAX_PATH];
unsigned native_pathlen;
};
/* CGF: FIXME This doesn't belong here */
int path_prefix_p (const char *path1, const char *path2, int len1) __attribute__ ((regparm (3)));
class cygheap_root
{
/* Root directory information.
This is used after a chroot is called. */
struct cygheap_root_mount_info *m;
public:
bool posix_ok (const char *path)
{
if (!m)
return 1;
return path_prefix_p (m->posix_path, path, m->posix_pathlen);
}
bool ischroot_native (const char *path)
{
if (!m)
return 1;
return strncasematch (m->native_path, path, m->native_pathlen)
&& (path[m->native_pathlen] == '\\' || !path[m->native_pathlen]);
}
const char *unchroot (const char *path)
{
if (!m)
return path;
const char *p = path + m->posix_pathlen;
if (!*p)
p = "/";
return p;
}
bool exists () {return !!m;}
void set (const char *posix, const char *native);
size_t posix_length () const { return m->posix_pathlen; }
const char *posix_path () const { return m->posix_path; }
size_t native_length () const { return m->native_pathlen; }
const char *native_path () const { return m->native_path; }
};
class cygheap_user
{
/* Extendend user information.
The information is derived from the internal_getlogin call
when on a NT system. */
char *pname; /* user's name */
char *plogsrv; /* Logon server, may be FQDN */
char *pdomain; /* Logon domain of the user */
PSID psid; /* buffer for user's SID */
public:
__uid16_t orig_uid; /* Remains intact even after impersonation */
__uid16_t orig_gid; /* Ditto */
__uid16_t real_uid; /* Remains intact on seteuid, replaced by setuid */
__gid16_t real_gid; /* Ditto */
/* token is needed if set(e)uid should be called. It can be set by a call
to `set_impersonation_token()'. */
HANDLE token;
BOOL impersonated;
cygheap_user () : pname (NULL), plogsrv (NULL), pdomain (NULL),
psid (NULL), token (INVALID_HANDLE_VALUE) {}
~cygheap_user ();
void set_name (const char *new_name);
const char *name () const { return pname; }
void set_logsrv (const char *new_logsrv);
const char *logsrv () const { return plogsrv; }
void set_domain (const char *new_domain);
const char *domain () const { return pdomain; }
BOOL set_sid (PSID new_sid);
PSID sid () const { return psid; }
void operator =(cygheap_user &user)
{
set_name (user.name ());
set_logsrv (user.logsrv ());
set_domain (user.domain ());
set_sid (user.sid ());
}
};
/* cwd cache stuff. */
class muto;
struct cwdstuff
{
char *posix;
char *win32;
DWORD hash;
muto *lock;
char *get (char *buf, int need_posix = 1, int with_chroot = 0, unsigned ulen = MAX_PATH);
DWORD get_hash ();
void init ();
void fixup_after_exec (char *win32, char *posix, DWORD hash);
bool get_initial ();
void set (const char *win32_cwd, const char *posix_cwd = NULL);
};
struct init_cygheap
{
_cmalloc_entry *chain;
char *buckets[32];
struct /* User heap stuff. */
{
void *heapbase;
void *heapptr;
void *heaptop;
};
cygheap_root root;
cygheap_user user;
mode_t umask;
HANDLE shared_h;
HANDLE console_h;
HANDLE etc_changed_h;
char *cygwin_regname;
cwdstuff cwd;
dtable fdtab;
bool etc_changed ();
};
#define CYGHEAPSIZE (sizeof (init_cygheap) + (4000 * sizeof (fhandler_union)) + (2 * 65536))
extern init_cygheap *cygheap;
extern void *cygheap_max;
class cygheap_fdmanip
{
protected:
int fd;
fhandler_base **fh;
bool locked;
public:
cygheap_fdmanip (): fh (NULL) {}
virtual ~cygheap_fdmanip ()
{
if (locked)
ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "cygheap_fdmanip");
}
void release ()
{
cygheap->fdtab.release (fd);
}
operator int &() {return fd;}
operator fhandler_base* &() {return *fh;}
void operator = (fhandler_base *fh) {*this->fh = fh;}
fhandler_base *operator -> () const {return *fh;}
bool isopen () const
{
if (*fh)
return true;
set_errno (EBADF);
return false;
}
};
class cygheap_fdnew : public cygheap_fdmanip
{
public:
cygheap_fdnew (int seed_fd = -1, bool lockit = true)
{
if (lockit)
SetResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "cygheap_fdnew");
if (seed_fd < 0)
fd = cygheap->fdtab.find_unused_handle ();
else
fd = cygheap->fdtab.find_unused_handle (seed_fd + 1);
if (fd >= 0)
{
locked = lockit;
fh = cygheap->fdtab + fd;
}
else
{
set_errno (EMFILE);
if (lockit)
ReleaseResourceLock (LOCK_FD_LIST, WRITE_LOCK | READ_LOCK, "cygheap_fdnew");
locked = false;
}
}
void operator = (fhandler_base *fh) {*this->fh = fh;}
};
class cygheap_fdget : public cygheap_fdmanip
{
public:
cygheap_fdget (int fd, bool lockit = false, bool do_set_errno = true)
{
if (lockit)
SetResourceLock (LOCK_FD_LIST, READ_LOCK, "cygheap_fdget");
if (fd >= 0 && fd < (int) cygheap->fdtab.size
&& *(fh = cygheap->fdtab + fd) != NULL)
{
this->fd = fd;
locked = lockit;
}
else
{
this->fd = -1;
if (do_set_errno)
set_errno (EBADF);
if (lockit)
ReleaseResourceLock (LOCK_FD_LIST, READ_LOCK, "cygheap_fdget");
locked = false;
}
}
};
class child_info;
void *__stdcall cygheap_setup_for_child (child_info *ci, bool dup_later) __attribute__ ((regparm(2)));
void __stdcall cygheap_setup_for_child_cleanup (void *, child_info *, bool) __attribute__ ((regparm(3)));
void __stdcall cygheap_fixup_in_child (child_info *, bool);
extern "C" {
void __stdcall cfree (void *) __attribute__ ((regparm(1)));
void *__stdcall cmalloc (cygheap_types, DWORD) __attribute__ ((regparm(2)));
void *__stdcall crealloc (void *, DWORD) __attribute__ ((regparm(2)));
void *__stdcall ccalloc (cygheap_types, DWORD, DWORD) __attribute__ ((regparm(3)));
char *__stdcall cstrdup (const char *) __attribute__ ((regparm(1)));
char *__stdcall cstrdup1 (const char *) __attribute__ ((regparm(1)));
void __stdcall cygheap_init ();
}