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#include "flock.h"
#ifndef _unix_
#include <util/generic/utility.h>
#include "winint.h"
#include <io.h>
#include <errno.h>
#ifdef __cplusplus
extern "C" {
#endif
int flock(int fd, int op) {
return Flock((HANDLE)_get_osfhandle(fd), op);
}
int Flock(void* hdl, int op) {
errno = 0;
if (hdl == INVALID_HANDLE_VALUE) {
errno = EBADF;
return -1;
}
DWORD low = 1, high = 0;
OVERLAPPED io;
Zero(io);
UnlockFileEx(hdl, 0, low, high, &io);
switch (op & ~LOCK_NB) {
case LOCK_EX:
case LOCK_SH: {
auto mode = ((op & ~LOCK_NB) == LOCK_EX) ? LOCKFILE_EXCLUSIVE_LOCK : 0;
if (op & LOCK_NB) {
if (LockFileEx(hdl, mode | LOCKFILE_FAIL_IMMEDIATELY, 0, low, high, &io)) {
return 0;
} else if (GetLastError() == ERROR_LOCK_VIOLATION) {
ClearLastSystemError();
errno = EWOULDBLOCK;
return -1;
}
} else {
if (LockFileEx(hdl, mode, 0, low, high, &io)) {
return 0;
}
}
break;
}
case LOCK_UN:
return 0;
break;
default:
break;
}
errno = EINVAL;
return -1;
}
int fsync(int fd) {
return _commit(fd);
}
#ifdef __cplusplus
}
#endif
#endif
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