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authorcvs2svn <>2008-12-22 22:45:57 +0300
committercvs2svn <>2008-12-22 22:45:57 +0300
commit0f285615efa16c783821cd87a1fdabe4913da9a7 (patch)
tree0108a4b20fb3c5414c4e221ff251a92050bd104d /winsup/cygwin/flock.cc
parent272fac20e743611550c6fad64f054934da6fd4bc (diff)
This commit was manufactured by cvs2svn to create branch 'newlib-newlib-1_17_0
1_17_0-arc'. Sprout from master 2008-12-22 19:45:56 UTC Jeff Johnston <jjohnstn@redhat.com> '' Cherrypick from cygnus 1999-05-03 07:29:06 UTC Richard Henderson <rth@redhat.com> '19990502 sourceware import': README config/mt-d30v config/mt-netware config/mt-ospace etc/add-log.el etc/add-log.vi etc/configbuild.ein etc/configbuild.fig etc/configbuild.jin etc/configbuild.tin etc/configdev.ein etc/configdev.fig etc/configdev.jin etc/configdev.tin makefile.vms Delete: djunpack.bat include/COPYING include/COPYING3 include/ChangeLog include/ChangeLog-9103 include/MAINTAINERS include/alloca-conf.h include/ansidecl.h include/aout/ChangeLog include/aout/adobe.h include/aout/aout64.h include/aout/ar.h include/aout/dynix3.h include/aout/encap.h include/aout/host.h include/aout/hp.h include/aout/hp300hpux.h include/aout/hppa.h include/aout/ranlib.h include/aout/reloc.h include/aout/stab.def include/aout/stab_gnu.h include/aout/sun4.h include/bfdlink.h include/binary-io.h include/bout.h include/coff/ChangeLog include/coff/ChangeLog-9103 include/coff/alpha.h include/coff/apollo.h include/coff/arm.h include/coff/aux-coff.h include/coff/ecoff.h include/coff/external.h include/coff/go32exe.h include/coff/h8300.h include/coff/h8500.h include/coff/i386.h include/coff/i860.h include/coff/i960.h include/coff/ia64.h include/coff/internal.h include/coff/m68k.h include/coff/m88k.h include/coff/maxq.h include/coff/mcore.h include/coff/mips.h include/coff/mipspe.h include/coff/or32.h include/coff/pe.h include/coff/powerpc.h include/coff/rs6000.h include/coff/rs6k64.h include/coff/sh.h include/coff/sparc.h include/coff/sym.h include/coff/symconst.h include/coff/ti.h include/coff/tic30.h include/coff/tic4x.h include/coff/tic54x.h include/coff/tic80.h include/coff/w65.h include/coff/we32k.h include/coff/x86_64.h include/coff/xcoff.h include/coff/z80.h include/coff/z8k.h include/demangle.h include/dis-asm.h include/dyn-string.h include/elf/ChangeLog include/elf/ChangeLog-9103 include/elf/alpha.h 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winsup/w32api/lib/igmpagnt.def winsup/w32api/lib/imagehlp.def winsup/w32api/lib/imm32.def winsup/w32api/lib/iphlpapi.def winsup/w32api/lib/kernel32.def winsup/w32api/lib/largeint.c winsup/w32api/lib/lz32.def winsup/w32api/lib/mapi32.def winsup/w32api/lib/mfcuia32.def winsup/w32api/lib/mgmtapi.def winsup/w32api/lib/mlang-uuid.c winsup/w32api/lib/mpr.def winsup/w32api/lib/mprapi.def winsup/w32api/lib/mqrt.def winsup/w32api/lib/msacm32.def winsup/w32api/lib/mscms.def winsup/w32api/lib/mshtml-uuid.c winsup/w32api/lib/msimg32.def winsup/w32api/lib/msvcp60.def winsup/w32api/lib/msvfw32.def winsup/w32api/lib/mswsock.def winsup/w32api/lib/msxml-uuid.c winsup/w32api/lib/nddeapi.def winsup/w32api/lib/netapi32.def winsup/w32api/lib/ntdll.def winsup/w32api/lib/oaidl-uuid.c winsup/w32api/lib/objidl-uuid.c winsup/w32api/lib/objsafe-uuid.c winsup/w32api/lib/ocidl-uuid.c winsup/w32api/lib/odbc32.def winsup/w32api/lib/odbccp32.def winsup/w32api/lib/ole32.def winsup/w32api/lib/oleacc-uuid.c winsup/w32api/lib/oleacc.def winsup/w32api/lib/oleaut32.def winsup/w32api/lib/olecli32.def winsup/w32api/lib/olectlid-uuid.c winsup/w32api/lib/oledlg.def winsup/w32api/lib/oleidl-uuid.c winsup/w32api/lib/olepro32.def winsup/w32api/lib/olesvr32.def winsup/w32api/lib/opengl32.def winsup/w32api/lib/penwin32.def winsup/w32api/lib/pkpd32.def winsup/w32api/lib/power-uuid.c winsup/w32api/lib/powrprof.def winsup/w32api/lib/psapi.def winsup/w32api/lib/quartz.def winsup/w32api/lib/rapi.def winsup/w32api/lib/rasapi32.def winsup/w32api/lib/rasdlg.def winsup/w32api/lib/res.rc winsup/w32api/lib/rpcdce4.def winsup/w32api/lib/rpcns4.def winsup/w32api/lib/rpcrt4.def winsup/w32api/lib/rtm.def winsup/w32api/lib/rtutils.def winsup/w32api/lib/scrnsave.c winsup/w32api/lib/secur32.def winsup/w32api/lib/servprov-uuid.c winsup/w32api/lib/setupapi.def winsup/w32api/lib/shell32.c winsup/w32api/lib/shell32.def winsup/w32api/lib/shfolder.def winsup/w32api/lib/shlwapi.def winsup/w32api/lib/snmpapi.def winsup/w32api/lib/svrapi.def winsup/w32api/lib/tapi32.def winsup/w32api/lib/test.c winsup/w32api/lib/th32.def winsup/w32api/lib/thunk32.def winsup/w32api/lib/unknwn-uuid.c winsup/w32api/lib/url.def winsup/w32api/lib/urlmon-uuid.c winsup/w32api/lib/user32.def winsup/w32api/lib/userenv.def winsup/w32api/lib/usp10.def winsup/w32api/lib/uxtheme.def winsup/w32api/lib/vdmdbg.def winsup/w32api/lib/version.def winsup/w32api/lib/vfw32.mri winsup/w32api/lib/win32spl.def winsup/w32api/lib/wininet.def winsup/w32api/lib/winmm.def winsup/w32api/lib/winspool.def winsup/w32api/lib/winstrm.def winsup/w32api/lib/wldap32.def winsup/w32api/lib/wow32.def winsup/w32api/lib/ws2_32.c winsup/w32api/lib/ws2_32.def winsup/w32api/lib/wsnmp32.def winsup/w32api/lib/wsock32.def winsup/w32api/lib/wst.def winsup/w32api/lib/wtsapi32.def
Diffstat (limited to 'winsup/cygwin/flock.cc')
-rw-r--r--winsup/cygwin/flock.cc1504
1 files changed, 0 insertions, 1504 deletions
diff --git a/winsup/cygwin/flock.cc b/winsup/cygwin/flock.cc
deleted file mode 100644
index 42941cb78..000000000
--- a/winsup/cygwin/flock.cc
+++ /dev/null
@@ -1,1504 +0,0 @@
-/* flock.cc. NT specific implementation of advisory file locking.
-
- Copyright 2003, 2008 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. */
-
-/* The basic mechanism as well as the datastructures used in the below
- implementation are taken from the FreeBSD repository on 2008-03-18.
- The essential code of the lf_XXX functions has been taken from the
- module src/sys/kern/kern_lockf.c. It has been adapted to use NT
- global namespace subdirs and event objects for synchronization
- purposes.
-
- So, the following copyright applies to most of the code in the lf_XXX
- functions.
-
- * Copyright (c) 1982, 1986, 1989, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Scooter Morris at Genentech Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)ufs_lockf.c 8.3 (Berkeley) 1/6/94
-*/
-
-/*
- * The flock() function is based upon source taken from the Red Hat
- * implementation used in their imap-2002d SRPM.
- *
- * $RH: flock.c,v 1.2 2000/08/23 17:07:00 nalin Exp $
- */
-
-/* The lockf function is based upon FreeBSD sources with the following
- * copyright.
- *
- * Copyright (c) 1997 The NetBSD Foundation, Inc.
- * All rights reserved.
- *
- * This code is derived from software contributed to The NetBSD Foundation
- * by Klaus Klein.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the NetBSD
- * Foundation, Inc. and its contributors.
- * 4. Neither the name of The NetBSD Foundation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
- * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- *
- * $NetBSD: lockf.c,v 1.1 1997/12/20 20:23:18 kleink Exp $
-*/
-
-#include "winsup.h"
-#include <assert.h>
-#include <sys/file.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include "cygerrno.h"
-#include "security.h"
-#include "shared_info.h"
-#include "path.h"
-#include "fhandler.h"
-#include "dtable.h"
-#include "cygheap.h"
-#include "pinfo.h"
-#include "sigproc.h"
-#include "cygtls.h"
-#include "tls_pbuf.h"
-#include "ntdll.h"
-#include <sys/queue.h>
-#include <wchar.h>
-
-#define F_WAIT 0x10 /* Wait until lock is granted */
-#define F_FLOCK 0x20 /* Use flock(2) semantics for lock */
-#define F_POSIX 0x40 /* Use POSIX semantics for lock */
-
-#ifndef OFF_MAX
-#define OFF_MAX LLONG_MAX
-#endif
-
-static NO_COPY muto lockf_guard;
-
-#define INODE_LIST_LOCK() (lockf_guard.init ("lockf_guard")->acquire ())
-#define INODE_LIST_UNLOCK() (lockf_guard.release ())
-
-#define LOCK_OBJ_NAME_LEN 64
-
-#define FLOCK_INODE_DIR_ACCESS (DIRECTORY_QUERY \
- | DIRECTORY_TRAVERSE \
- | DIRECTORY_CREATE_OBJECT \
- | READ_CONTROL)
-
-#define FLOCK_EVENT_ACCESS (EVENT_QUERY_STATE \
- | SYNCHRONIZE \
- | READ_CONTROL)
-
-/* This function takes the own process security descriptor DACL and adds
- SYNCHRONIZE permissions for everyone. This allows all processes
- to wait for this process to die when blocking in a F_SETLKW on a lock
- which is hold by this process. */
-static void
-allow_others_to_sync ()
-{
- static NO_COPY bool done;
-
- if (done)
- return;
-
- NTSTATUS status;
- PACL dacl;
- LPVOID ace;
- ULONG len;
-
- /* Get this process DACL. We use a temporary path buffer in TLS space
- to avoid having to alloc 64K from the stack. */
- tmp_pathbuf tp;
- PSECURITY_DESCRIPTOR sd = (PSECURITY_DESCRIPTOR) tp.w_get ();
- status = NtQuerySecurityObject (hMainProc, DACL_SECURITY_INFORMATION, sd,
- NT_MAX_PATH * sizeof (WCHAR), &len);
- if (!NT_SUCCESS (status))
- {
- debug_printf ("NtQuerySecurityObject: %p", status);
- return;
- }
- /* Create a valid dacl pointer and set it's size to be as big as
- there's room in the temporary buffer. Note that the descriptor
- is in self-relative format. */
- dacl = (PACL) ((char *) sd + (uintptr_t) sd->Dacl);
- dacl->AclSize = NT_MAX_PATH * sizeof (WCHAR) - ((char *) dacl - (char *) sd);
- /* Allow everyone to SYNCHRONIZE with this process. */
- if (!AddAccessAllowedAce (dacl, ACL_REVISION, SYNCHRONIZE,
- well_known_world_sid))
- {
- debug_printf ("AddAccessAllowedAce: %lu", GetLastError ());
- return;
- }
- /* Set the size of the DACL correctly. */
- if (!FindFirstFreeAce (dacl, &ace))
- {
- debug_printf ("FindFirstFreeAce: %lu", GetLastError ());
- return;
- }
- dacl->AclSize = (char *) ace - (char *) dacl;
- /* Write the DACL back. */
- status = NtSetSecurityObject (hMainProc, DACL_SECURITY_INFORMATION, sd);
- if (!NT_SUCCESS (status))
- {
- debug_printf ("NtSetSecurityObject: %p", status);
- return;
- }
- done = true;
-}
-
-/* Get the handle count of an object. */
-static ULONG
-get_obj_handle_count (HANDLE h)
-{
- OBJECT_BASIC_INFORMATION obi;
- NTSTATUS status;
- ULONG hdl_cnt = 0;
-
- status = NtQueryObject (h, ObjectBasicInformation, &obi, sizeof obi, NULL);
- if (!NT_SUCCESS (status))
- debug_printf ("NtQueryObject: %p\n", status);
- else
- hdl_cnt = obi.HandleCount;
- return hdl_cnt;
-}
-
-/* Per lock class. */
-class lockf_t
-{
- public:
- short lf_flags; /* Semantics: F_POSIX, F_FLOCK, F_WAIT */
- short lf_type; /* Lock type: F_RDLCK, F_WRLCK */
- _off64_t lf_start; /* Byte # of the start of the lock */
- _off64_t lf_end; /* Byte # of the end of the lock (-1=EOF) */
- long long lf_id; /* Cygwin PID for POSIX locks, a unique id per
- file table entry for BSD flock locks. */
- DWORD lf_wid; /* Win PID of the resource holding the lock */
- class lockf_t **lf_head; /* Back pointer to the head of the lockf_t list */
- class inode_t *lf_inode; /* Back pointer to the inode_t */
- class lockf_t *lf_next; /* Pointer to the next lock on this inode_t */
- HANDLE lf_obj; /* Handle to the lock event object. */
-
- lockf_t ()
- : lf_flags (0), lf_type (0), lf_start (0), lf_end (0), lf_id (0),
- lf_wid (0), lf_head (NULL), lf_inode (NULL),
- lf_next (NULL), lf_obj (NULL)
- {}
- lockf_t (class inode_t *node, class lockf_t **head, short flags, short type,
- _off64_t start, _off64_t end, long long id, DWORD wid)
- : lf_flags (flags), lf_type (type), lf_start (start), lf_end (end),
- lf_id (id), lf_wid (wid), lf_head (head), lf_inode (node),
- lf_next (NULL), lf_obj (NULL)
- {}
- ~lockf_t ();
-
- /* Used to create all locks list in a given TLS buffer. */
- void *operator new (size_t size, void *p)
- { return p; }
- /* Used to store own lock list in the cygheap. */
- void *operator new (size_t size)
- { return cmalloc (HEAP_FHANDLER, sizeof (lockf_t)); }
- /* Never call on node->i_all_lf! */
- void operator delete (void *p)
- { cfree (p); }
-
- void create_lock_obj ();
- bool open_lock_obj ();
- void del_lock_obj (HANDLE fhdl, bool signal = false);
-};
-
-/* Per inode_t class */
-class inode_t
-{
- friend class lockf_t;
-
- public:
- LIST_ENTRY (inode_t) i_next;
- lockf_t *i_lockf; /* List of locks of this process. */
- lockf_t *i_all_lf; /* Temp list of all locks for this file. */
-
- __dev32_t i_dev; /* Device ID */
- __ino64_t i_ino; /* inode number */
-
- private:
- HANDLE i_dir;
- HANDLE i_mtx;
-
- public:
- inode_t (__dev32_t dev, __ino64_t ino);
- ~inode_t ();
-
- void *operator new (size_t size)
- { return cmalloc (HEAP_FHANDLER, sizeof (inode_t)); }
- void operator delete (void *p)
- { cfree (p); }
-
- static inode_t *get (__dev32_t dev, __ino64_t ino, bool create_if_missing);
-
- void LOCK () { WaitForSingleObject (i_mtx, INFINITE); }
- void UNLOCK () { ReleaseMutex (i_mtx); }
-
- lockf_t *get_all_locks_list ();
-
- bool del_my_locks (long long id, HANDLE fhdl);
-};
-
-inode_t::~inode_t ()
-{
- lockf_t *lock, *n_lock;
- for (lock = i_lockf; lock && (n_lock = lock->lf_next, 1); lock = n_lock)
- delete lock;
- NtClose (i_mtx);
- NtClose (i_dir);
-}
-
-bool
-inode_t::del_my_locks (long long id, HANDLE fhdl)
-{
- lockf_t *lock, *n_lock;
- lockf_t **prev = &i_lockf;
- int lc = 0;
- for (lock = *prev; lock && (n_lock = lock->lf_next, 1); lock = n_lock)
- {
- if (lock->lf_flags & F_POSIX)
- {
- /* Delete all POSIX locks. */
- *prev = n_lock;
- ++lc;
- delete lock;
- }
- else if (id && lock->lf_id == id)
- {
- int cnt = 0;
- cygheap_fdenum cfd (true);
- while (cfd.next () >= 0)
- if (cfd->get_unique_id () == lock->lf_id && ++cnt > 1)
- break;
- /* Delete BSD flock lock when no other fd in this process references
- it anymore. */
- if (cnt <= 1)
- {
- *prev = n_lock;
- lock->del_lock_obj (fhdl);
- delete lock;
- }
- }
- else
- prev = &lock->lf_next;
- }
- return i_lockf == NULL;
-}
-
-/* Used to delete the locks on a file hold by this process. Called from
- close(2) and fixup_after_fork, as well as from fixup_after_exec in
- case the close_on_exec flag is set. The whole inode is deleted as
- soon as no lock exists on it anymore. */
-void
-fhandler_base::del_my_locks (bool after_fork)
-{
- INODE_LIST_LOCK ();
- inode_t *node = inode_t::get (get_dev (), get_ino (), false);
- if (node)
- {
- bool no_locks_left =
- node->del_my_locks (after_fork ? 0 : get_unique_id (), get_handle ());
- if (no_locks_left)
- {
- LIST_REMOVE (node, i_next);
- node->UNLOCK ();
- delete node;
- }
- else
- node->UNLOCK ();
- }
- INODE_LIST_UNLOCK ();
-}
-
-/* Called in an execed child. The exec'ed process must allow SYNCHRONIZE
- access to everyone if at least one inode exists.
- The lock owner's Windows PID changed and all POSIX lock event objects
- have to be relabeled so that waiting processes know which process to
- wait on. If the node has been abandoned due to close_on_exec on the
- referencing fhandlers, remove the inode entirely. */
-void
-fixup_lockf_after_exec ()
-{
- inode_t *node, *next_node;
-
- INODE_LIST_LOCK ();
- if (LIST_FIRST (&cygheap->inode_list))
- allow_others_to_sync ();
- LIST_FOREACH_SAFE (node, &cygheap->inode_list, i_next, next_node)
- {
- int cnt = 0;
- cygheap_fdenum cfd (true);
- while (cfd.next () >= 0)
- if (cfd->get_dev () == node->i_dev
- && cfd->get_ino () == node->i_ino
- && ++cnt > 1)
- break;
- if (cnt == 0)
- {
- LIST_REMOVE (node, i_next);
- delete node;
- }
- else
- {
- node->LOCK ();
- for (lockf_t *lock = node->i_lockf; lock; lock = lock->lf_next)
- if (lock->lf_flags & F_POSIX)
- {
- lock->del_lock_obj (NULL);
- lock->lf_wid = myself->dwProcessId;
- lock->create_lock_obj ();
- }
- node->UNLOCK ();
- }
- }
- INODE_LIST_UNLOCK ();
-}
-
-/* static method to return a pointer to the inode_t structure for a specific
- file. The file is specified by the device and inode_t number. If inode_t
- doesn't exist, create it. */
-inode_t *
-inode_t::get (__dev32_t dev, __ino64_t ino, bool create_if_missing)
-{
- inode_t *node;
-
- INODE_LIST_LOCK ();
- LIST_FOREACH (node, &cygheap->inode_list, i_next)
- if (node->i_dev == dev && node->i_ino == ino)
- break;
- if (!node && create_if_missing)
- {
- node = new inode_t (dev, ino);
- if (node)
- LIST_INSERT_HEAD (&cygheap->inode_list, node, i_next);
- }
- if (node)
- node->LOCK ();
- INODE_LIST_UNLOCK ();
- return node;
-}
-
-inode_t::inode_t (__dev32_t dev, __ino64_t ino)
-: i_lockf (NULL), i_all_lf (NULL), i_dev (dev), i_ino (ino)
-{
- HANDLE parent_dir;
- WCHAR name[48];
- UNICODE_STRING uname;
- OBJECT_ATTRIBUTES attr;
- NTSTATUS status;
-
- parent_dir = get_shared_parent_dir ();
- /* Create a subdir which is named after the device and inode_t numbers
- of the given file, in hex notation. */
- int len = __small_swprintf (name, L"flock-%08x-%016X", dev, ino);
- RtlInitCountedUnicodeString (&uname, name, len * sizeof (WCHAR));
- InitializeObjectAttributes (&attr, &uname, OBJ_INHERIT | OBJ_OPENIF,
- parent_dir, everyone_sd (FLOCK_INODE_DIR_ACCESS));
- status = NtCreateDirectoryObject (&i_dir, FLOCK_INODE_DIR_ACCESS, &attr);
- if (!NT_SUCCESS (status))
- api_fatal ("NtCreateDirectoryObject(inode): %p", status);
- /* Create a mutex object in the file specific dir, which is used for
- access synchronization on the dir and its objects. */
- RtlInitUnicodeString (&uname, L"mtx");
- InitializeObjectAttributes (&attr, &uname, OBJ_INHERIT | OBJ_OPENIF, i_dir,
- everyone_sd (CYG_MUTANT_ACCESS));
- status = NtCreateMutant (&i_mtx, CYG_MUTANT_ACCESS, &attr, FALSE);
- if (!NT_SUCCESS (status))
- api_fatal ("NtCreateMutant(inode): %p", status);
-}
-
-/* Enumerate all lock event objects for this file and create a lockf_t
- list in the i_all_lf member. This list is searched in lf_getblock
- for locks which potentially block our lock request. */
-
-/* Number of lockf_t structs which fit in the temporary buffer. */
-#define MAX_LOCKF_CNT ((intptr_t)((NT_MAX_PATH * sizeof (WCHAR)) \
- / sizeof (lockf_t)))
-
-lockf_t *
-inode_t::get_all_locks_list ()
-{
- struct fdbi
- {
- DIRECTORY_BASIC_INFORMATION dbi;
- WCHAR buf[2][NAME_MAX + 1];
- } f;
- ULONG context;
- NTSTATUS status;
- lockf_t *lock = i_all_lf;
-
- for (BOOLEAN restart = TRUE;
- NT_SUCCESS (status = NtQueryDirectoryObject (i_dir, &f, sizeof f, TRUE,
- restart, &context, NULL));
- restart = FALSE)
- {
- if (f.dbi.ObjectName.Length != LOCK_OBJ_NAME_LEN * sizeof (WCHAR))
- continue;
- wchar_t *wc = f.dbi.ObjectName.Buffer, *endptr;
- /* "%02x-%01x-%016X-%016X-%016X-%08x",
- lf_flags, lf_type, lf_start, lf_end, lf_id, lf_wid */
- wc[LOCK_OBJ_NAME_LEN] = L'\0';
- short flags = wcstol (wc, &endptr, 16);
- if ((flags & ~(F_FLOCK | F_POSIX)) != 0
- || ((flags & (F_FLOCK | F_POSIX)) == (F_FLOCK | F_POSIX)))
- continue;
- short type = wcstol (endptr + 1, &endptr, 16);
- if ((type != F_RDLCK && type != F_WRLCK) || !endptr || *endptr != L'-')
- continue;
- _off64_t start = (_off64_t) wcstoull (endptr + 1, &endptr, 16);
- if (start < 0 || !endptr || *endptr != L'-')
- continue;
- _off64_t end = (_off64_t) wcstoull (endptr + 1, &endptr, 16);
- if (end < -1LL || (end > 0 && end < start) || !endptr || *endptr != L'-')
- continue;
- long long id = wcstoll (endptr + 1, &endptr, 16);
- if (!endptr || *endptr != L'-'
- || ((flags & F_POSIX) && (id < 1 || id > ULONG_MAX)))
- continue;
- DWORD wid = wcstoul (endptr + 1, &endptr, 16);
- if (endptr && *endptr != L'\0')
- continue;
- if (lock - i_all_lf >= MAX_LOCKF_CNT)
- {
- system_printf ("Warning, can't handle more than %d locks per file.",
- MAX_LOCKF_CNT);
- break;
- }
- if (lock > i_all_lf)
- lock[-1].lf_next = lock;
- new (lock++) lockf_t (this, &i_all_lf, flags, type, start, end, id, wid);
- }
- /* If no lock has been found, return NULL. */
- if (lock == i_all_lf)
- return NULL;
- return i_all_lf;
-}
-
-/* Create the lock event object in the file's subdir in the NT global
- namespace. The name is constructed from the lock properties which
- identify it uniquely, all values in hex. See the __small_swprintf
- call right at the start. */
-void
-lockf_t::create_lock_obj ()
-{
- WCHAR name[LOCK_OBJ_NAME_LEN + 1];
- UNICODE_STRING uname;
- OBJECT_ATTRIBUTES attr;
- NTSTATUS status;
-
- __small_swprintf (name, L"%02x-%01x-%016X-%016X-%016X-%08x",
- lf_flags & (F_POSIX | F_FLOCK), lf_type, lf_start,
- lf_end, lf_id, lf_wid);
- RtlInitCountedUnicodeString (&uname, name,
- LOCK_OBJ_NAME_LEN * sizeof (WCHAR));
- InitializeObjectAttributes (&attr, &uname, OBJ_INHERIT, lf_inode->i_dir,
- everyone_sd (FLOCK_EVENT_ACCESS));
- status = NtCreateEvent (&lf_obj, CYG_EVENT_ACCESS, &attr,
- NotificationEvent, FALSE);
- if (!NT_SUCCESS (status))
- api_fatal ("NtCreateEvent(lock): %p", status);
-}
-
-/* Open a lock event object for SYNCHRONIZE access (to wait for it). */
-bool
-lockf_t::open_lock_obj ()
-{
- WCHAR name[LOCK_OBJ_NAME_LEN + 1];
- UNICODE_STRING uname;
- OBJECT_ATTRIBUTES attr;
- NTSTATUS status;
-
- __small_swprintf (name, L"%02x-%01x-%016X-%016X-%016X-%08x",
- lf_flags & (F_POSIX | F_FLOCK), lf_type, lf_start,
- lf_end, lf_id, lf_wid);
- RtlInitCountedUnicodeString (&uname, name,
- LOCK_OBJ_NAME_LEN * sizeof (WCHAR));
- InitializeObjectAttributes (&attr, &uname, 0, lf_inode->i_dir, NULL);
- status = NtOpenEvent (&lf_obj, FLOCK_EVENT_ACCESS, &attr);
- if (!NT_SUCCESS (status))
- {
- SetLastError (RtlNtStatusToDosError (status));
- lf_obj = NULL; /* Paranoia... */
- }
- return lf_obj != NULL;
-}
-
-/* Close a lock event handle. The important thing here is to signal it
- before closing the handle. This way all threads waiting for this
- lock can wake up. */
-void
-lockf_t::del_lock_obj (HANDLE fhdl, bool signal)
-{
- if (lf_obj)
- {
- /* Only signal the event if it's either a POSIX lock, or, in case of
- BSD flock locks, if it's an explicit unlock or if the calling fhandler
- holds the last reference to the file table entry. The file table
- entry in UNIX terms is equivalent to the FILE_OBJECT in Windows NT
- terms. It's what the handle/descriptor references when calling
- CreateFile/open. Calling DuplicateHandle/dup only creates a new
- handle/descriptor to the same FILE_OBJECT/file table entry. */
- if ((lf_flags & F_POSIX) || signal
- || (fhdl && get_obj_handle_count (fhdl) <= 1))
- SetEvent (lf_obj);
- NtClose (lf_obj);
- lf_obj = NULL;
- }
-}
-
-lockf_t::~lockf_t ()
-{
- del_lock_obj (NULL);
-}
-
-/*
- * This variable controls the maximum number of processes that will
- * be checked in doing deadlock detection.
- */
-#ifndef __CYGWIN__
-#define MAXDEPTH 50
-static int maxlockdepth = MAXDEPTH;
-#endif
-
-#define NOLOCKF (struct lockf_t *)0
-#define SELF 0x1
-#define OTHERS 0x2
-static int lf_clearlock (lockf_t *, lockf_t **, HANDLE);
-static int lf_findoverlap (lockf_t *, lockf_t *, int, lockf_t ***, lockf_t **);
-static lockf_t *lf_getblock (lockf_t *, inode_t *node);
-static int lf_getlock (lockf_t *, inode_t *, struct __flock64 *);
-static int lf_setlock (lockf_t *, inode_t *, lockf_t **, HANDLE);
-static void lf_split (lockf_t *, lockf_t *, lockf_t **);
-static void lf_wakelock (lockf_t *, HANDLE);
-
-int
-fhandler_disk_file::lock (int a_op, struct __flock64 *fl)
-{
- _off64_t start, end, oadd;
- lockf_t *n;
- int error = 0;
-
- short a_flags = fl->l_type & (F_POSIX | F_FLOCK);
- short type = fl->l_type & (F_RDLCK | F_WRLCK | F_UNLCK);
-
- if (!a_flags)
- a_flags = F_POSIX; /* default */
- if (a_op == F_SETLKW)
- {
- a_op = F_SETLK;
- a_flags |= F_WAIT;
- }
- if (a_op == F_SETLK)
- switch (type)
- {
- case F_UNLCK:
- a_op = F_UNLCK;
- break;
- case F_RDLCK:
- if (!(get_access () & GENERIC_READ))
- {
- set_errno (EBADF);
- return -1;
- }
- break;
- case F_WRLCK:
- if (!(get_access () & GENERIC_WRITE))
- {
- set_errno (EBADF);
- return -1;
- }
- break;
- default:
- set_errno (EINVAL);
- return -1;
- }
-
- /*
- * Convert the flock structure into a start and end.
- */
- switch (fl->l_whence)
- {
- case SEEK_SET:
- start = fl->l_start;
- break;
-
- case SEEK_CUR:
- if ((start = lseek (0, SEEK_CUR)) == ILLEGAL_SEEK)
- return -1;
- break;
-
- case SEEK_END:
- {
- NTSTATUS status;
- IO_STATUS_BLOCK io;
- FILE_STANDARD_INFORMATION fsi;
-
- status = NtQueryInformationFile (get_handle (), &io, &fsi, sizeof fsi,
- FileStandardInformation);
- if (!NT_SUCCESS (status))
- {
- __seterrno_from_nt_status (status);
- return -1;
- }
- if (fl->l_start > 0 && fsi.EndOfFile.QuadPart > OFF_MAX - fl->l_start)
- {
- set_errno (EOVERFLOW);
- return -1;
- }
- start = fsi.EndOfFile.QuadPart + fl->l_start;
- }
- break;
-
- default:
- return (EINVAL);
- }
- if (start < 0)
- {
- set_errno (EINVAL);
- return -1;
- }
- if (fl->l_len < 0)
- {
- if (start == 0)
- {
- set_errno (EINVAL);
- return -1;
- }
- end = start - 1;
- start += fl->l_len;
- if (start < 0)
- {
- set_errno (EINVAL);
- return -1;
- }
- }
- else if (fl->l_len == 0)
- end = -1;
- else
- {
- oadd = fl->l_len - 1;
- if (oadd > OFF_MAX - start)
- {
- set_errno (EOVERFLOW);
- return -1;
- }
- end = start + oadd;
- }
-
- inode_t *node = inode_t::get (get_dev (), get_ino (), true);
- if (!node)
- {
- set_errno (ENOLCK);
- return -1;
- }
- need_fork_fixup (true);
-
- /* Unlock the fd table which has been locked in fcntl_worker/lock_worker,
- otherwise a blocking F_SETLKW never wakes up on a signal. */
- cygheap->fdtab.unlock ();
-
- lockf_t **head = &node->i_lockf;
-
- /*
- * Avoid the common case of unlocking when inode_t has no locks.
- */
- if (*head == NULL)
- {
- if (a_op != F_SETLK)
- {
- node->UNLOCK ();
- fl->l_type = F_UNLCK;
- return 0;
- }
- }
- /*
- * Allocate a spare structure in case we have to split.
- */
- lockf_t *clean = NULL;
- if (a_op == F_SETLK || a_op == F_UNLCK)
- {
- clean = new lockf_t ();
- if (!clean)
- {
- node->UNLOCK ();
- set_errno (ENOLCK);
- return -1;
- }
- }
- /*
- * Create the lockf_t structure
- */
- lockf_t *lock = new lockf_t (node, head, a_flags, type, start, end,
- (a_flags & F_FLOCK) ? get_unique_id ()
- : getpid (),
- myself->dwProcessId);
- if (!lock)
- {
- node->UNLOCK ();
- set_errno (ENOLCK);
- return -1;
- }
-
- switch (a_op)
- {
- case F_SETLK:
- error = lf_setlock (lock, node, &clean, get_handle ());
- break;
-
- case F_UNLCK:
- error = lf_clearlock (lock, &clean, get_handle ());
- lock->lf_next = clean;
- clean = lock;
- break;
-
- case F_GETLK:
- error = lf_getlock (lock, node, fl);
- lock->lf_next = clean;
- clean = lock;
- break;
-
- default:
- lock->lf_next = clean;
- clean = lock;
- error = EINVAL;
- break;
- }
- for (lock = clean; lock != NULL; )
- {
- n = lock->lf_next;
- lock->del_lock_obj (get_handle (), a_op == F_UNLCK);
- delete lock;
- lock = n;
- }
- if (node->i_lockf == NULL)
- {
- INODE_LIST_LOCK ();
- LIST_REMOVE (node, i_next);
- node->UNLOCK ();
- delete node;
- INODE_LIST_UNLOCK ();
- }
- else
- node->UNLOCK ();
- if (error)
- {
- set_errno (error);
- return -1;
- }
- return 0;
-}
-
-/*
- * Set a byte-range lock.
- */
-static int
-lf_setlock (lockf_t *lock, inode_t *node, lockf_t **clean, HANDLE fhdl)
-{
- lockf_t *block;
- lockf_t **head = lock->lf_head;
- lockf_t **prev, *overlap;
- int ovcase, priority, old_prio, needtolink;
- tmp_pathbuf tp;
-
- /*
- * Set the priority
- */
- priority = old_prio = GetThreadPriority (GetCurrentThread ());
- if (lock->lf_type == F_WRLCK && priority <= THREAD_PRIORITY_ABOVE_NORMAL)
- priority = THREAD_PRIORITY_HIGHEST;
- /*
- * Scan lock list for this file looking for locks that would block us.
- */
- /* Create temporary space for the all locks list. */
- node->i_all_lf = (lockf_t *) tp.w_get ();
- while ((block = lf_getblock(lock, node)))
- {
- DWORD ret;
- HANDLE obj = block->lf_obj;
- block->lf_obj = NULL;
-
- /*
- * Free the structure and return if nonblocking.
- */
- if ((lock->lf_flags & F_WAIT) == 0)
- {
- lock->lf_next = *clean;
- *clean = lock;
- if (obj)
- NtClose (obj);
- return EAGAIN;
- }
- /*
- * We are blocked. Since flock style locks cover
- * the whole file, there is no chance for deadlock.
- * For byte-range locks we must check for deadlock.
- *
- * Deadlock detection is done by looking through the
- * wait channels to see if there are any cycles that
- * involve us. MAXDEPTH is set just to make sure we
- * do not go off into neverland.
- */
- /* FIXME: We check the handle count of all the lock event objects
- this process holds. If it's > 1, another process is
- waiting for one of our locks. This method isn't overly
- intelligent. If it turns out to be too dumb, we might
- have to remove it or to find another method. */
- for (lockf_t *lk = node->i_lockf; lk; lk = lk->lf_next)
- if ((lk->lf_flags & F_POSIX) && get_obj_handle_count (lk->lf_obj) > 1)
- {
- if (obj)
- NtClose (obj);
- return EDEADLK;
- }
-
- /*
- * For flock type locks, we must first remove
- * any shared locks that we hold before we sleep
- * waiting for an exclusive lock.
- */
- if ((lock->lf_flags & F_FLOCK) && lock->lf_type == F_WRLCK)
- {
- lock->lf_type = F_UNLCK;
- (void) lf_clearlock (lock, clean, fhdl);
- lock->lf_type = F_WRLCK;
- }
-
- /*
- * Add our lock to the blocked list and sleep until we're free.
- * Remember who blocked us (for deadlock detection).
- */
- /* Cygwin: No locked list. See deadlock recognition above. */
-
- /* Wait for the blocking object and its holding process. */
- if (!obj)
- {
- /* We can't synchronize on the lock event object.
- Treat this as a deadlock-like situation for now. */
- system_printf ("Can't sync with lock object hold by "
- "Win32 pid %lu: %E", block->lf_wid);
- return EDEADLK;
- }
- SetThreadPriority (GetCurrentThread (), priority);
- if (lock->lf_flags & F_POSIX)
- {
- HANDLE proc = OpenProcess (SYNCHRONIZE, FALSE, block->lf_wid);
- if (!proc)
- {
- /* If we can't synchronize on the process holding the lock,
- we will never recognize when the lock has been abandoned.
- Treat this as a deadlock-like situation for now. */
- system_printf ("Can't sync with process holding a lock "
- "(Win32 pid %lu): %E", block->lf_wid);
- NtClose (obj);
- return EDEADLK;
- }
- HANDLE w4[3] = { obj, proc, signal_arrived };
- node->UNLOCK ();
- ret = WaitForMultipleObjects (3, w4, FALSE, INFINITE);
- CloseHandle (proc);
- }
- else
- {
- HANDLE w4[2] = { obj, signal_arrived };
- node->UNLOCK ();
- /* Unfortunately, since BSD flock locks are not attached to a
- specific process, we can't recognize an abandoned lock by
- sync'ing with a process. We have to find out if we're the only
- process left accessing this event object. */
- do
- {
- ret = WaitForMultipleObjects (2, w4, FALSE, 100L);
- }
- while (ret == WAIT_TIMEOUT && get_obj_handle_count (obj) > 1);
- }
- node->LOCK ();
- NtClose (obj);
- SetThreadPriority (GetCurrentThread (), old_prio);
- switch (ret)
- {
- case WAIT_OBJECT_0:
- /* The lock object has been set to signalled. */
- break;
- case WAIT_OBJECT_0 + 1:
- /* For POSIX locks, the process holding the lock has exited. */
- if (lock->lf_flags & F_POSIX)
- break;
- /*FALLTHRU*/
- case WAIT_OBJECT_0 + 2:
- /* A signal came in. */
- _my_tls.call_signal_handler ();
- return EINTR;
- default:
- return geterrno_from_win_error ();
- }
- }
- allow_others_to_sync ();
- /*
- * No blocks!! Add the lock. Note that we will
- * downgrade or upgrade any overlapping locks this
- * process already owns.
- *
- * Handle any locks that overlap.
- */
- prev = head;
- block = *head;
- needtolink = 1;
- for (;;)
- {
- ovcase = lf_findoverlap (block, lock, SELF, &prev, &overlap);
- if (ovcase)
- block = overlap->lf_next;
- /*
- * Six cases:
- * 0) no overlap
- * 1) overlap == lock
- * 2) overlap contains lock
- * 3) lock contains overlap
- * 4) overlap starts before lock
- * 5) overlap ends after lock
- */
- switch (ovcase)
- {
- case 0: /* no overlap */
- if (needtolink)
- {
- *prev = lock;
- lock->lf_next = overlap;
- lock->create_lock_obj ();
- }
- break;
-
- case 1: /* overlap == lock */
- /*
- * If downgrading lock, others may be
- * able to acquire it.
- * Cygwin: Always wake lock.
- */
- lf_wakelock (overlap, fhdl);
- overlap->lf_type = lock->lf_type;
- overlap->create_lock_obj ();
- lock->lf_next = *clean;
- *clean = lock;
- break;
-
- case 2: /* overlap contains lock */
- /*
- * Check for common starting point and different types.
- */
- if (overlap->lf_type == lock->lf_type)
- {
- lock->lf_next = *clean;
- *clean = lock;
- break;
- }
- if (overlap->lf_start == lock->lf_start)
- {
- *prev = lock;
- lock->lf_next = overlap;
- overlap->lf_start = lock->lf_end + 1;
- }
- else
- lf_split (overlap, lock, clean);
- lf_wakelock (overlap, fhdl);
- overlap->create_lock_obj ();
- lock->create_lock_obj ();
- if (lock->lf_next && !lock->lf_next->lf_obj)
- lock->lf_next->create_lock_obj ();
- break;
-
- case 3: /* lock contains overlap */
- /*
- * If downgrading lock, others may be able to
- * acquire it, otherwise take the list.
- * Cygwin: Always wake old lock and create new lock.
- */
- lf_wakelock (overlap, fhdl);
- /*
- * Add the new lock if necessary and delete the overlap.
- */
- if (needtolink)
- {
- *prev = lock;
- lock->lf_next = overlap->lf_next;
- prev = &lock->lf_next;
- lock->create_lock_obj ();
- needtolink = 0;
- }
- else
- *prev = overlap->lf_next;
- overlap->lf_next = *clean;
- *clean = overlap;
- continue;
-
- case 4: /* overlap starts before lock */
- /*
- * Add lock after overlap on the list.
- */
- lock->lf_next = overlap->lf_next;
- overlap->lf_next = lock;
- overlap->lf_end = lock->lf_start - 1;
- prev = &lock->lf_next;
- lf_wakelock (overlap, fhdl);
- overlap->create_lock_obj ();
- lock->create_lock_obj ();
- needtolink = 0;
- continue;
-
- case 5: /* overlap ends after lock */
- /*
- * Add the new lock before overlap.
- */
- if (needtolink) {
- *prev = lock;
- lock->lf_next = overlap;
- }
- overlap->lf_start = lock->lf_end + 1;
- lf_wakelock (overlap, fhdl);
- lock->create_lock_obj ();
- overlap->create_lock_obj ();
- break;
- }
- break;
- }
- return 0;
-}
-
-/*
- * Remove a byte-range lock on an inode_t.
- *
- * Generally, find the lock (or an overlap to that lock)
- * and remove it (or shrink it), then wakeup anyone we can.
- */
-static int
-lf_clearlock (lockf_t *unlock, lockf_t **clean, HANDLE fhdl)
-{
- lockf_t **head = unlock->lf_head;
- lockf_t *lf = *head;
- lockf_t *overlap, **prev;
- int ovcase;
-
- if (lf == NOLOCKF)
- return 0;
- prev = head;
- while ((ovcase = lf_findoverlap (lf, unlock, SELF, &prev, &overlap)))
- {
- /*
- * Wakeup the list of locks to be retried.
- */
- lf_wakelock (overlap, fhdl);
-
- switch (ovcase)
- {
- case 1: /* overlap == lock */
- *prev = overlap->lf_next;
- overlap->lf_next = *clean;
- *clean = overlap;
- break;
-
- case 2: /* overlap contains lock: split it */
- if (overlap->lf_start == unlock->lf_start)
- {
- overlap->lf_start = unlock->lf_end + 1;
- overlap->create_lock_obj ();
- break;
- }
- lf_split (overlap, unlock, clean);
- overlap->lf_next = unlock->lf_next;
- overlap->create_lock_obj ();
- if (overlap->lf_next && !overlap->lf_next->lf_obj)
- overlap->lf_next->create_lock_obj ();
- break;
-
- case 3: /* lock contains overlap */
- *prev = overlap->lf_next;
- lf = overlap->lf_next;
- overlap->lf_next = *clean;
- *clean = overlap;
- continue;
-
- case 4: /* overlap starts before lock */
- overlap->lf_end = unlock->lf_start - 1;
- prev = &overlap->lf_next;
- lf = overlap->lf_next;
- overlap->create_lock_obj ();
- continue;
-
- case 5: /* overlap ends after lock */
- overlap->lf_start = unlock->lf_end + 1;
- overlap->create_lock_obj ();
- break;
- }
- break;
- }
- return 0;
-}
-
-/*
- * Check whether there is a blocking lock,
- * and if so return its process identifier.
- */
-static int
-lf_getlock (lockf_t *lock, inode_t *node, struct __flock64 *fl)
-{
- lockf_t *block;
- tmp_pathbuf tp;
-
- /* Create temporary space for the all locks list. */
- node->i_all_lf = (lockf_t *) tp.w_get ();
- if ((block = lf_getblock (lock, node)))
- {
- if (block->lf_obj)
- NtClose (block->lf_obj);
- fl->l_type = block->lf_type;
- fl->l_whence = SEEK_SET;
- fl->l_start = block->lf_start;
- if (block->lf_end == -1)
- fl->l_len = 0;
- else
- fl->l_len = block->lf_end - block->lf_start + 1;
- if (block->lf_flags & F_POSIX)
- fl->l_pid = (pid_t) block->lf_id;
- else
- fl->l_pid = -1;
- }
- else
- fl->l_type = F_UNLCK;
- return 0;
-}
-
-/*
- * Walk the list of locks for an inode_t and
- * return the first blocking lock.
- */
-static lockf_t *
-lf_getblock (lockf_t *lock, inode_t *node)
-{
- lockf_t **prev, *overlap;
- lockf_t *lf = node->get_all_locks_list ();
- int ovcase;
- NTSTATUS status;
- EVENT_BASIC_INFORMATION ebi;
-
- prev = lock->lf_head;
- while ((ovcase = lf_findoverlap (lf, lock, OTHERS, &prev, &overlap)))
- {
- /*
- * We've found an overlap, see if it blocks us
- */
- if ((lock->lf_type == F_WRLCK || overlap->lf_type == F_WRLCK))
- {
- /* Open the event object for synchronization. */
- if (!overlap->open_lock_obj () || (overlap->lf_flags & F_POSIX))
- return overlap;
- /* In case of BSD flock locks, check if the event object is
- signalled. If so, the overlap doesn't actually exist anymore.
- There are just a few open handles left. */
- status = NtQueryEvent (overlap->lf_obj, EventBasicInformation,
- &ebi, sizeof ebi, NULL);
- if (!NT_SUCCESS (status) || ebi.SignalState == 0)
- return overlap;
- NtClose (overlap->lf_obj);
- overlap->lf_obj = NULL;
- }
- /*
- * Nope, point to the next one on the list and
- * see if it blocks us
- */
- lf = overlap->lf_next;
- }
- return NOLOCKF;
-}
-
-/*
- * Walk the list of locks for an inode_t to
- * find an overlapping lock (if any).
- *
- * NOTE: this returns only the FIRST overlapping lock. There
- * may be more than one.
- */
-static int
-lf_findoverlap (lockf_t *lf, lockf_t *lock, int type, lockf_t ***prev,
- lockf_t **overlap)
-{
- _off64_t start, end;
-
- *overlap = lf;
- if (lf == NOLOCKF)
- return 0;
-
- start = lock->lf_start;
- end = lock->lf_end;
- while (lf != NOLOCKF)
- {
- if (((type & OTHERS) && lf->lf_id == lock->lf_id)
- /* As on Linux: POSIX locks and BSD flock locks don't interact. */
- || (lf->lf_flags & (F_POSIX | F_FLOCK))
- != (lock->lf_flags & (F_POSIX | F_FLOCK)))
- {
- *prev = &lf->lf_next;
- *overlap = lf = lf->lf_next;
- continue;
- }
- /*
- * OK, check for overlap
- *
- * Six cases:
- * 0) no overlap
- * 1) overlap == lock
- * 2) overlap contains lock
- * 3) lock contains overlap
- * 4) overlap starts before lock
- * 5) overlap ends after lock
- */
- if ((lf->lf_end != -1 && start > lf->lf_end) ||
- (end != -1 && lf->lf_start > end))
- {
- /* Case 0 */
- if ((type & SELF) && end != -1 && lf->lf_start > end)
- return 0;
- *prev = &lf->lf_next;
- *overlap = lf = lf->lf_next;
- continue;
- }
- if ((lf->lf_start == start) && (lf->lf_end == end))
- {
- /* Case 1 */
- return 1;
- }
- if ((lf->lf_start <= start) && (end != -1) &&
- ((lf->lf_end >= end) || (lf->lf_end == -1)))
- {
- /* Case 2 */
- return 2;
- }
- if (start <= lf->lf_start && (end == -1 ||
- (lf->lf_end != -1 && end >= lf->lf_end)))
- {
- /* Case 3 */
- return 3;
- }
- if ((lf->lf_start < start) &&
- ((lf->lf_end >= start) || (lf->lf_end == -1)))
- {
- /* Case 4 */
- return 4;
- }
- if ((lf->lf_start > start) && (end != -1) &&
- ((lf->lf_end > end) || (lf->lf_end == -1)))
- {
- /* Case 5 */
- return 5;
- }
- api_fatal ("lf_findoverlap: default\n");
- }
- return 0;
-}
-
-/*
- * Split a lock and a contained region into
- * two or three locks as necessary.
- */
-static void
-lf_split (lockf_t *lock1, lockf_t *lock2, lockf_t **split)
-{
- lockf_t *splitlock;
-
- /*
- * Check to see if spliting into only two pieces.
- */
- if (lock1->lf_start == lock2->lf_start)
- {
- lock1->lf_start = lock2->lf_end + 1;
- lock2->lf_next = lock1;
- return;
- }
- if (lock1->lf_end == lock2->lf_end)
- {
- lock1->lf_end = lock2->lf_start - 1;
- lock2->lf_next = lock1->lf_next;
- lock1->lf_next = lock2;
- return;
- }
- /*
- * Make a new lock consisting of the last part of
- * the encompassing lock. We use the preallocated
- * splitlock so we don't have to block.
- */
- splitlock = *split;
- assert (splitlock != NULL);
- *split = splitlock->lf_next;
- memcpy (splitlock, lock1, sizeof *splitlock);
- /* We have to unset the obj HANDLE here which has been copied by the
- above memcpy, so that the calling function recognizes the new object.
- See post-lf_split handling in lf_setlock and lf_clearlock. */
- splitlock->lf_obj = NULL;
- splitlock->lf_start = lock2->lf_end + 1;
- lock1->lf_end = lock2->lf_start - 1;
- /*
- * OK, now link it in
- */
- splitlock->lf_next = lock1->lf_next;
- lock2->lf_next = splitlock;
- lock1->lf_next = lock2;
-}
-
-/*
- * Wakeup a blocklist
- * Cygwin: Just signal the lock which gets removed. This unblocks
- * all threads waiting for this lock.
- */
-static void
-lf_wakelock (lockf_t *listhead, HANDLE fhdl)
-{
- listhead->del_lock_obj (fhdl, true);
-}
-
-extern "C" int
-flock (int fd, int operation)
-{
- int res = -1;
- int cmd;
- struct __flock64 fl = { 0, SEEK_SET, 0, 0, 0 };
-
- myfault efault;
- if (efault.faulted (EFAULT))
- return -1;
-
- cygheap_fdget cfd (fd, true);
- if (cfd < 0)
- goto done;
-
- cmd = (operation & LOCK_NB) ? F_SETLK : F_SETLKW;
- switch (operation & (~LOCK_NB))
- {
- case LOCK_EX:
- fl.l_type = F_WRLCK | F_FLOCK;
- break;
- case LOCK_SH:
- fl.l_type = F_RDLCK | F_FLOCK;
- break;
- case LOCK_UN:
- fl.l_type = F_UNLCK | F_FLOCK;
- break;
- default:
- set_errno (EINVAL);
- goto done;
- }
- res = cfd->lock (cmd, &fl);
- if ((res == -1) && ((get_errno () == EAGAIN) || (get_errno () == EACCES)))
- set_errno (EWOULDBLOCK);
-done:
- syscall_printf ("%d = flock (%d, %d)", res, fd, operation);
- return res;
-}
-
-extern "C" int
-lockf (int filedes, int function, _off64_t size)
-{
- int res = -1;
- int cmd;
- struct __flock64 fl;
-
- myfault efault;
- if (efault.faulted (EFAULT))
- return -1;
-
- cygheap_fdget cfd (filedes, true);
- if (cfd < 0)
- goto done;
-
- fl.l_start = 0;
- fl.l_len = size;
- fl.l_whence = SEEK_CUR;
-
- switch (function)
- {
- case F_ULOCK:
- cmd = F_SETLK;
- fl.l_type = F_UNLCK;
- break;
- case F_LOCK:
- cmd = F_SETLKW;
- fl.l_type = F_WRLCK;
- break;
- case F_TLOCK:
- cmd = F_SETLK;
- fl.l_type = F_WRLCK;
- break;
- case F_TEST:
- fl.l_type = F_WRLCK;
- if (cfd->lock (F_GETLK, &fl) == -1)
- goto done;
- if (fl.l_type == F_UNLCK || fl.l_pid == getpid ())
- res = 0;
- else
- errno = EAGAIN;
- goto done;
- /* NOTREACHED */
- default:
- errno = EINVAL;
- goto done;
- /* NOTREACHED */
- }
- res = cfd->lock (cmd, &fl);
-done:
- syscall_printf ("%d = lockf (%d, %d, %D)", res, filedes, function, size);
- return res;
-}