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Make important improvements

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- Fix preadv() and pwritev() for old distros
- Introduce _npassert() and _unassert() macros
- Prove that file locks work properly on Windows
- Support fcntl(F_DUPFD_CLOEXEC) on more systems
This commit is contained in:
Justine Tunney 2022-09-14 21:29:50 -07:00
parent 1ad2f530f9
commit 3f49889841
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GPG key ID: BE714B4575D6E328
130 changed files with 1225 additions and 431 deletions
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47
libc/calls/flock-nt.c
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@ -17,28 +17,49 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/internal.h"
#include "libc/calls/struct/fd.internal.h"
#include "libc/calls/syscall-nt.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/nt/enum/filelockflags.h"
#include "libc/nt/files.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/byhandlefileinformation.h"
#include "libc/nt/struct/overlapped.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/lock.h"
#include "libc/sysv/errfuns.h"
#define _LOCK_SH 0
#define _LOCK_EX kNtLockfileExclusiveLock
#define _LOCK_NB kNtLockfileFailImmediately
#define _LOCK_UN 8
textwindows int sys_flock_nt(int fd, int op) {
struct NtOverlapped ov;
int64_t h;
struct NtByHandleFileInformation info;
if (!__isfdkind(fd, kFdFile)) return ebadf();
bzero(&ov, sizeof(ov));
if (GetFileInformationByHandle(g_fds.p[fd].handle, &info) &&
((!(op & LOCK_UN) &&
LockFileEx(g_fds.p[fd].handle, op, 0, info.nFileSizeLow,
info.nFileSizeHigh, &ov)) ||
((op & LOCK_UN) && UnlockFileEx(g_fds.p[fd].handle, 0, info.nFileSizeLow,
info.nFileSizeHigh, &ov)))) {
return 0;
} else {
h = g_fds.p[fd].handle;
struct NtOverlapped ov = {.hEvent = h};
if (!GetFileInformationByHandle(h, &info)) {
return __winerr();
}
if (op & _LOCK_UN) {
if (op & ~_LOCK_UN) {
return einval();
}
if (UnlockFileEx(h, 0, info.nFileSizeLow, info.nFileSizeHigh, &ov)) {
return 0;
} else {
return -1;
}
}
if (op & ~(_LOCK_SH | _LOCK_EX | _LOCK_NB)) {
return einval();
}
if (LockFileEx(h, op, 0, info.nFileSizeLow, info.nFileSizeHigh, &ov)) {
return 0;
} else {
return -1;
}
}