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Fix POSIX advisory locks on Windows

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This commit is contained in:
Justine Tunney 2022-09-15 12:44:00 -07:00
parent 050062bcbb
commit a5fa90a21f
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
14 changed files with 472 additions and 39 deletions
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103
libc/calls/fcntl-nt.c
View file

@ -44,22 +44,34 @@
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
bool __force_sqlite_to_work_until_we_can_fix_it;
static textwindows int sys_fcntl_nt_dupfd(int fd, int cmd, int start) {
if (start < 0) return einval();
return sys_dup_nt(fd, -1, (cmd == F_DUPFD_CLOEXEC ? O_CLOEXEC : 0), start);
}
static textwindows int sys_fcntl_nt_lock(struct Fd *f, int cmd, uintptr_t arg) {
int e;
struct flock *l;
uint32_t flags, err;
struct NtOverlapped ov;
int64_t pos, off, len, size;
struct NtByHandleFileInformation info;
if (!GetFileInformationByHandle(f->handle, &info)) return __winerr();
if (!SetFilePointerEx(f->handle, 0, &pos, SEEK_CUR)) return __winerr();
if (!GetFileInformationByHandle(f->handle, &info)) {
return __winerr();
}
pos = 0;
if (!SetFilePointerEx(f->handle, 0, &pos, SEEK_CUR)) {
return __winerr();
}
l = (struct flock *)arg;
len = l->l_len;
off = l->l_start;
size = (uint64_t)info.nFileSizeHigh << 32 | info.nFileSizeLow;
switch (l->l_whence) {
case SEEK_SET:
break;
@ -72,37 +84,64 @@ static textwindows int sys_fcntl_nt_lock(struct Fd *f, int cmd, uintptr_t arg) {
default:
return einval();
}
if (!len) len = size - off;
if (off < 0 || len < 0) return einval();
_offset2overlap(f->handle, off, &ov);
if (l->l_type == F_RDLCK || l->l_type == F_WRLCK) {
flags = 0;
if (cmd == F_SETLK) flags |= kNtLockfileFailImmediately;
/* TODO: How can we make SQLite locks on Windows to work? */
/* if (l->l_type == F_WRLCK) flags |= kNtLockfileExclusiveLock; */
if (LockFileEx(f->handle, flags, 0, len, len >> 32, &ov)) {
return 0;
} else {
err = GetLastError();
if (err == kNtErrorLockViolation) err = EAGAIN;
errno = err;
return -1;
}
} else if (l->l_type == F_UNLCK) {
if (UnlockFileEx(f->handle, 0, len, len >> 32, &ov)) {
return 0;
} else {
err = GetLastError();
if (err == kNtErrorNotLocked) {
return 0;
} else {
errno = err;
return -1;
}
}
} else {
if (!len) {
len = size - off;
}
if (off < 0 || len < 0) {
return einval();
}
bool32 ok;
struct NtOverlapped ov = {.hEvent = f->handle,
.Pointer = (void *)(uintptr_t)off};
if (l->l_type == F_RDLCK || l->l_type == F_WRLCK) {
flags = 0;
if (cmd != F_SETLKW) {
flags |= kNtLockfileFailImmediately;
}
if (l->l_type == F_WRLCK) {
flags |= kNtLockfileExclusiveLock;
}
e = errno;
ok = LockFileEx(f->handle, flags, 0, len, len >> 32, &ov);
if (cmd == F_GETLK) {
if (ok) {
l->l_type = F_UNLCK;
if (!UnlockFileEx(f->handle, 0, len, len >> 32, &ov)) {
notpossible;
}
} else {
l->l_pid = -1;
ok = true;
}
}
if (ok) {
return 0;
} else if (__force_sqlite_to_work_until_we_can_fix_it) {
errno = e;
return 0;
} else {
return -1;
}
}
if (l->l_type == F_UNLCK) {
if (cmd == F_GETLK) return einval();
e = errno;
if (UnlockFileEx(f->handle, 0, len, len >> 32, &ov)) {
return 0;
} else if (errno == ENOLCK) {
errno = e;
return 0;
} else {
return 0;
}
}
return einval();
}
textwindows int sys_fcntl_nt(int fd, int cmd, uintptr_t arg) {

2
libc/intrin/describeflags.internal.h
View file

@ -30,6 +30,7 @@ const char *DescribeNtFileFlagAttr(char[256], uint32_t);
const char *DescribeNtFileMapFlags(char[64], uint32_t);
const char *DescribeNtFileShareFlags(char[64], uint32_t);
const char *DescribeNtFiletypeFlags(char[64], uint32_t);
const char *DescribeNtLockFileFlags(char[64], uint32_t);
const char *DescribeNtMovFileInpFlags(char[256], uint32_t);
const char *DescribeNtPageFlags(char[64], uint32_t);
const char *DescribeNtPipeModeFlags(char[64], uint32_t);
@ -72,6 +73,7 @@ const char *DescribeWhence(char[12], int);
#define DescribeNtFileMapFlags(x) DescribeNtFileMapFlags(alloca(64), x)
#define DescribeNtFileShareFlags(x) DescribeNtFileShareFlags(alloca(64), x)
#define DescribeNtFiletypeFlags(x) DescribeNtFiletypeFlags(alloca(64), x)
#define DescribeNtLockFileFlags(x) DescribeNtLockFileFlags(alloca(64), x)
#define DescribeNtMovFileInpFlags(x) DescribeNtMovFileInpFlags(alloca(256), x)
#define DescribeNtPageFlags(x) DescribeNtPageFlags(alloca(64), x)
#define DescribeNtPipeModeFlags(x) DescribeNtPipeModeFlags(alloca(64), x)

31
libc/intrin/describentlockfileflags.c Normal file
View file

@ -0,0 +1,31 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/describeflags.internal.h"
#include "libc/macros.internal.h"
#include "libc/nt/enum/filelockflags.h"
static const struct DescribeFlags kNtLockFileFlags[] = {
{kNtLockfileFailImmediately, "FailImmediately"}, //
{kNtLockfileExclusiveLock, "ExclusiveLock"}, //
};
const char *(DescribeNtLockFileFlags)(char buf[64], uint32_t x) {
return DescribeFlags(buf, 64, kNtLockFileFlags, ARRAYLEN(kNtLockFileFlags),
"kNtLockfile", x);
}

50
libc/intrin/describentoverlapped.c Normal file
View file

@ -0,0 +1,50 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/describentoverlapped.internal.h"
#include "libc/intrin/kprintf.h"
#include "libc/macros.internal.h"
#include "libc/nt/struct/overlapped.h"
const char *(DescribeNtOverlapped)(char b[128], struct NtOverlapped *o) {
int i = 0, n = 128;
bool gotsome = false;
if (!o) return "NULL";
i += ksnprintf(b + i, MAX(0, n - i), "{");
if (o->hEvent) {
if (gotsome) {
i += ksnprintf(b + i, MAX(0, n - i), ", ");
} else {
gotsome = true;
}
i += ksnprintf(b + i, MAX(0, n - i), ".hEvent = %ld", o->hEvent);
}
if (o->Pointer) {
if (gotsome) {
i += ksnprintf(b + i, MAX(0, n - i), ", ");
} else {
gotsome = true;
}
i += ksnprintf(b + i, MAX(0, n - i), ".Pointer = (void *)%p", o->Pointer);
}
i += ksnprintf(b + i, MAX(0, n - i), "}");
return b;
}

13
libc/intrin/describentoverlapped.internal.h Executable file
View file

@ -0,0 +1,13 @@
#ifndef COSMOPOLITAN_LIBC_INTRIN_DESCRIBENTOVERLAPPED_INTERNAL_H_
#define COSMOPOLITAN_LIBC_INTRIN_DESCRIBENTOVERLAPPED_INTERNAL_H_
#include "libc/mem/alloca.h"
#include "libc/nt/struct/overlapped.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
const char *DescribeNtOverlapped(char[128], struct NtOverlapped *);
#define DescribeNtOverlapped(x) DescribeNtOverlapped(alloca(128), x)
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_INTRIN_DESCRIBENTOVERLAPPED_INTERNAL_H_ */

50
libc/intrin/lockfileex.c Normal file
View file

@ -0,0 +1,50 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/strace.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/describentoverlapped.internal.h"
#include "libc/nt/files.h"
__msabi extern typeof(LockFileEx) *const __imp_LockFileEx;
/**
* Locks file on the New Technology.
*
* @return handle, or -1 on failure
* @note this wrapper takes care of ABI, STRACE(), and __winerr()
*/
bool32 LockFileEx(int64_t hFile, uint32_t dwFlags, uint32_t dwReserved,
uint32_t nNumberOfBytesToLockLow,
uint32_t nNumberOfBytesToLockHigh,
struct NtOverlapped *lpOverlapped) {
bool32 ok;
STRACE("LockFileEx(%ld, %s, %#x, %'zu, %s) → ...", hFile,
DescribeNtLockFileFlags(dwFlags), dwReserved,
(uint64_t)nNumberOfBytesToLockHigh << 32 | nNumberOfBytesToLockLow,
DescribeNtOverlapped(lpOverlapped));
ok = __imp_LockFileEx(hFile, dwFlags, dwReserved, nNumberOfBytesToLockLow,
nNumberOfBytesToLockHigh, lpOverlapped);
if (!ok) __winerr();
STRACE("LockFileEx(%ld, %s, %#x, %'zu, [%s]) → %hhhd% m", hFile,
DescribeNtLockFileFlags(dwFlags), dwReserved,
(uint64_t)nNumberOfBytesToLockHigh << 32 | nNumberOfBytesToLockLow,
DescribeNtOverlapped(lpOverlapped), ok);
return ok;
}

45
libc/intrin/unlockfileex.c Normal file
View file

@ -0,0 +1,45 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/strace.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/intrin/describentoverlapped.internal.h"
#include "libc/nt/files.h"
#include "libc/nt/struct/overlapped.h"
__msabi extern typeof(UnlockFileEx) *const __imp_UnlockFileEx;
/**
* Unlocks file on the New Technology.
*
* @return handle, or -1 on failure
* @note this wrapper takes care of ABI, STRACE(), and __winerr()
*/
bool32 UnlockFileEx(int64_t hFile, uint32_t dwReserved,
uint32_t nNumberOfBytesToUnlockLow,
uint32_t nNumberOfBytesToUnlockHigh,
struct NtOverlapped *lpOverlapped) {
bool32 ok;
ok = __imp_UnlockFileEx(hFile, dwReserved, nNumberOfBytesToUnlockLow,
nNumberOfBytesToUnlockHigh, lpOverlapped);
if (!ok) __winerr();
STRACE("UnlockFileEx(%ld, %#x, %'zu, %s) → %hhhd% m", hFile, dwReserved,
(uint64_t)nNumberOfBytesToUnlockHigh << 32 | nNumberOfBytesToUnlockLow,
DescribeNtOverlapped(lpOverlapped), ok);
return ok;
}

4
libc/nt/kernel32/LockFileEx.s
View file

@ -2,11 +2,11 @@
.imp kernel32,__imp_LockFileEx,LockFileEx,0
.text.windows
LockFileEx:
__LockFileEx:
push %rbp
mov %rsp,%rbp
.profilable
mov __imp_LockFileEx(%rip),%rax
jmp __sysv2nt6
.endfn LockFileEx,globl
.endfn __LockFileEx,globl
.previous

13
libc/nt/kernel32/SuspendThread.s
View file

@ -1,2 +1,15 @@
.include "o/libc/nt/codegen.inc"
.imp kernel32,__imp_SuspendThread,SuspendThread,0
.text.windows
SuspendThread:
push %rbp
mov %rsp,%rbp
.profilable
mov %rdi,%rcx
sub $32,%rsp
call *__imp_SuspendThread(%rip)
leave
ret
.endfn SuspendThread,globl
.previous

4
libc/nt/kernel32/UnlockFileEx.s
View file

@ -2,11 +2,11 @@
.imp kernel32,__imp_UnlockFileEx,UnlockFileEx,0
.text.windows
UnlockFileEx:
__UnlockFileEx:
push %rbp
mov %rsp,%rbp
.profilable
mov __imp_UnlockFileEx(%rip),%rax
jmp __sysv2nt6
.endfn UnlockFileEx,globl
.endfn __UnlockFileEx,globl
.previous

6
libc/nt/master.sh
View file

@ -700,7 +700,6 @@ imp 'LocalUnlock' LocalUnlock kernel32 0
imp 'LocaleNameToLCID' LocaleNameToLCID kernel32 0
imp 'LocateXStateFeature' LocateXStateFeature kernel32 0
imp 'LockFile' LockFile kernel32 0 5
imp 'LockFileEx' LockFileEx kernel32 0 6
imp 'LockResource' LockResource kernel32 0 1
imp 'MapUserPhysicalPages' MapUserPhysicalPages kernel32 0
imp 'MapUserPhysicalPagesScatter' MapUserPhysicalPagesScatter kernel32 986
@ -983,7 +982,7 @@ imp 'SleepConditionVariableSRW' SleepConditionVariableSRW kernel32 0
imp 'SleepEx' SleepEx kernel32 0 2
imp 'SortCloseHandle' SortCloseHandle kernel32 1416
imp 'SortGetHandle' SortGetHandle kernel32 1417
imp 'SuspendThread' SuspendThread kernel32 0
imp 'SuspendThread' SuspendThread kernel32 0 1
imp 'SwitchToFiber' SwitchToFiber kernel32 0
imp 'SwitchToThread' SwitchToThread kernel32 0
imp 'SystemTimeToFileTime' SystemTimeToFileTime kernel32 0 2
@ -1024,7 +1023,6 @@ imp 'UTUnRegister' UTUnRegister kernel32 1459
imp 'UmsThreadYield' UmsThreadYield kernel32 1460
imp 'UnhandledExceptionFilter' UnhandledExceptionFilter kernel32 0
imp 'UnlockFile' UnlockFile kernel32 0 5
imp 'UnlockFileEx' UnlockFileEx kernel32 0 5
imp 'UnmapViewOfFile2' UnmapViewOfFile2 kernel32 0 2
imp 'UnmapViewOfFileEx' UnmapViewOfFileEx kernel32 0 3
imp 'UnregisterApplicationRecoveryCallback' UnregisterApplicationRecoveryCallback kernel32 1466
@ -1120,6 +1118,7 @@ imp '__FlushViewOfFile' FlushViewOfFile kernel32 0 2
imp '__GenerateConsoleCtrlEvent' GenerateConsoleCtrlEvent kernel32 0 2
imp '__GetExitCodeProcess' GetExitCodeProcess kernel32 0 2
imp '__GetFileAttributes' GetFileAttributesW kernel32 0 1
imp '__LockFileEx' LockFileEx kernel32 0 6
imp '__MapViewOfFileEx' MapViewOfFileEx kernel32 0 6
imp '__MapViewOfFileExNuma' MapViewOfFileExNuma kernel32 0 7
imp '__MoveFileEx' MoveFileExW kernel32 0 3
@ -1128,6 +1127,7 @@ imp '__ReOpenFile' ReOpenFile kernel32 0 4 # TODO(jart): 6.2 and highe
imp '__RemoveDirectory' RemoveDirectoryW kernel32 0 1
imp '__SetCurrentDirectory' SetCurrentDirectoryW kernel32 0 1
imp '__TerminateProcess' TerminateProcess kernel32 0 2
imp '__UnlockFileEx' UnlockFileEx kernel32 0 5
imp '__UnmapViewOfFile' UnmapViewOfFile kernel32 0 1
imp '__VirtualProtect' VirtualProtect kernel32 0 4
imp '__WaitForMultipleObjects' WaitForMultipleObjects kernel32 0 4

183
test/libc/calls/lock_test.c Normal file
View file

@ -0,0 +1,183 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/flock.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/sysv/consts/f.h"
#include "libc/sysv/consts/o.h"
#include "libc/testlib/testlib.h"
#include "libc/thread/thread.h"
/**
* @fileoverview POSIX Advisory Locks Test
*/
#define PROCESSES 8
#define THREADS (IsWindows() ? 8 : 0)
#define RATIO 3
#define ITERATIONS 10
char testlib_enable_tmp_setup_teardown;
_Thread_local const char *kind;
void Log(const char *fmt, ...) {
#if 0
va_list va;
char b[512];
int i, n = sizeof(b);
va_start(va, fmt);
i = ksnprintf(b, n, "%s pid=%d tid=%d ", kind, getpid(), gettid());
i += kvsnprintf(b + i, MAX(0, n - i), fmt, va);
i += ksnprintf(b + i, MAX(0, n - i), "\n");
write(2, b, MIN(i, n));
va_end(va);
#endif
}
void Lock(int fd, int type, long start, long len) {
int e;
struct flock lock = {
.l_type = type,
.l_whence = SEEK_SET,
.l_start = start,
.l_len = len,
};
e = errno;
while (fcntl(fd, F_SETLK, &lock)) {
ASSERT_TRUE(errno == EAGAIN || errno == EACCES);
errno = e;
Log("flock spinning on %d", fd);
}
}
void WriteLock(int fd, long start, long len) {
Lock(fd, F_WRLCK, start, len);
Log("acquired write lock on %d", fd);
}
void ReadLock(int fd, long start, long len) {
Lock(fd, F_RDLCK, start, len);
Log("acquired read lock on %d", fd);
}
void Unlock(int fd, long start, long len) {
Lock(fd, F_UNLCK, start, len);
Log("released lock on %d", fd);
}
void *Reader(void *arg) {
int i, j, fd;
char buf[10];
kind = arg;
ASSERT_NE(-1, (fd = open("db", O_RDONLY)));
for (j = 0; j < ITERATIONS; ++j) {
ReadLock(fd, 10, 10);
for (i = 0; i < 10; ++i) {
ASSERT_SYS(0, 1, pread(fd, buf + i, 1, 10 + i));
ASSERT_EQ(buf[0], buf[i]);
}
Unlock(fd, 10, 10);
sched_yield();
}
ASSERT_SYS(0, 0, close(fd));
return 0;
}
void *Writer(void *arg) {
int i, j, fd;
char buf[10];
kind = arg;
ASSERT_NE(-1, (fd = open("db", O_RDWR)));
for (j = 0; j < ITERATIONS; ++j) {
WriteLock(fd, 10, 10);
for (i = 0; i < 10; ++i) {
ASSERT_SYS(0, 1, pread(fd, buf + i, 1, 10 + i));
ASSERT_EQ(buf[0], buf[i]);
}
for (i = 0; i < 10; ++i) {
buf[i]++;
}
for (i = 0; i < 10; ++i) {
ASSERT_SYS(0, 1, pwrite(fd, buf + i, 1, 10 + i));
}
Unlock(fd, 10, 10);
sched_yield();
}
ASSERT_SYS(0, 0, close(fd));
return 0;
}
TEST(posixAdvisoryLocks, threadsAndProcessesFightingForLock) {
int i, rc, pid, fd, ws;
pthread_t th[THREADS + 1];
ASSERT_SYS(0, 3, creat("db", 0644));
ASSERT_SYS(0, 0, ftruncate(3, 30));
ASSERT_SYS(0, 0, close(3));
for (i = 0; i < THREADS; ++i) {
if (i % RATIO == 0) {
ASSERT_EQ(0, pthread_create(th + i, 0, Reader, "reader thread"));
} else {
ASSERT_EQ(0, pthread_create(th + i, 0, Writer, "writer thread"));
}
}
for (i = 0; i < PROCESSES; ++i) {
ASSERT_NE(-1, (rc = fork()));
if (!rc) {
if (i % RATIO == 0) {
Writer("writer process");
} else {
Reader("reader process");
}
_Exit(0);
}
}
ASSERT_NE(-1, (fd = open("db", O_RDWR)));
Lock(fd, F_WRLCK, 0, 10);
Lock(fd, F_WRLCK, 20, 10);
for (i = 0; i < THREADS; ++i) {
ASSERT_EQ(0, pthread_join(th[i], 0));
}
kind = "main process";
for (;;) {
int e = errno;
if ((pid = waitpid(0, &ws, 0)) != -1) {
if (WIFSIGNALED(ws)) {
Log("process %d terminated with %G", pid, WTERMSIG(ws));
testlib_incrementfailed();
} else if (WEXITSTATUS(ws)) {
Log("process %d exited with %d", pid, WEXITSTATUS(ws));
testlib_incrementfailed();
}
} else {
ASSERT_EQ(ECHILD, errno);
errno = e;
break;
}
}
ASSERT_SYS(0, 0, close(fd));
}

3
test/libc/calls/test.mk
View file

@ -103,6 +103,9 @@ o/$(MODE)/test/libc/calls/poll_test.com.runs: \
o/$(MODE)/test/libc/calls/fcntl_test.com.runs: \
private .PLEDGE = stdio rpath wpath cpath fattr proc flock
o/$(MODE)/test/libc/calls/lock_test.com.runs: \
private .PLEDGE = stdio rpath wpath cpath fattr proc flock
o/$(MODE)/test/libc/calls/openbsd_test.com.runs: \
private .PLEDGE = stdio rpath wpath cpath fattr proc unveil

4
third_party/sqlite3/main.c vendored
View file

@ -3105,6 +3105,10 @@ static int openDatabase(
char *zErrMsg = 0; /* Error message from sqlite3ParseUri() */
int i; /* Loop counter */
// TODO(jart): Fix SQLite.
extern bool __force_sqlite_to_work_until_we_can_fix_it;
__force_sqlite_to_work_until_we_can_fix_it = true;
#ifdef SQLITE_ENABLE_API_ARMOR
if( ppDb==0 ) return SQLITE_MISUSE_BKPT;
#endif