##// END OF EJS Templates
util: make `mmapread()` work on Windows again...
util: make `mmapread()` work on Windows again 522b4d729e89 started referencing `mmap.MAP_PRIVATE`, but that's not available on Windows, so `hg version` worked, but `make local` did not. That commit also started calling the constructor with the fine-grained `flags` and `prot` args, but those aren't available on Windows either[1] (though the backing C code doesn't seem conditionalized to disallow usage of them). I assume the change away from from the `access` arg was to provide the same options, plus `MAP_POPULATE`. Looking at the source code[2], they're not quite the same- `ACCESS_READ` is equivalent to `flags = MAP_SHARED` and `prot = PROT_READ`. `MAP_PRIVATE` is only used with `ACCESS_COPY`, which allows read and write. Therefore, we can't quite get the same baseline flags on Windows, but this was the status quo ante and `MAP_POPULATE` is a Linux thing, so presumably it works. I realize that typically the OS differences are abstracted into the platform modules, but I'm leaving it here so that it is obvious what the differences are between the platforms. [1] https://docs.python.org/3/library/mmap.html#mmap.mmap [2] https://github.com/python/cpython/blob/5e0abb47886bc665eefdcc19fde985f803e49d4c/Modules/mmapmodule.c#L1539

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osutilbuild.py
108 lines | 2.4 KiB | text/x-python | PythonLexer
from __future__ import annotations
import cffi
ffi = cffi.FFI()
ffi.set_source(
"mercurial.cffi._osutil",
"""
#include <sys/attr.h>
#include <sys/vnode.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
typedef struct val_attrs {
uint32_t length;
attribute_set_t returned;
attrreference_t name_info;
fsobj_type_t obj_type;
struct timespec mtime;
uint32_t accessmask;
off_t datalength;
} __attribute__((aligned(4), packed)) val_attrs_t;
""",
include_dirs=['mercurial'],
)
ffi.cdef(
'''
typedef uint32_t attrgroup_t;
typedef struct attrlist {
uint16_t bitmapcount; /* number of attr. bit sets in list */
uint16_t reserved; /* (to maintain 4-byte alignment) */
attrgroup_t commonattr; /* common attribute group */
attrgroup_t volattr; /* volume attribute group */
attrgroup_t dirattr; /* directory attribute group */
attrgroup_t fileattr; /* file attribute group */
attrgroup_t forkattr; /* fork attribute group */
...;
};
typedef struct attribute_set {
...;
} attribute_set_t;
typedef struct attrreference {
int attr_dataoffset;
int attr_length;
...;
} attrreference_t;
typedef int ... off_t;
typedef struct val_attrs {
uint32_t length;
attribute_set_t returned;
attrreference_t name_info;
uint32_t obj_type;
struct timespec mtime;
uint32_t accessmask;
off_t datalength;
...;
} val_attrs_t;
/* the exact layout of the above struct will be figured out during build time */
typedef int ... time_t;
typedef struct timespec {
time_t tv_sec;
...;
};
int getattrlist(const char* path, struct attrlist * attrList, void * attrBuf,
size_t attrBufSize, unsigned int options);
int getattrlistbulk(int dirfd, struct attrlist * attrList, void * attrBuf,
size_t attrBufSize, uint64_t options);
#define ATTR_BIT_MAP_COUNT ...
#define ATTR_CMN_NAME ...
#define ATTR_CMN_OBJTYPE ...
#define ATTR_CMN_MODTIME ...
#define ATTR_CMN_ACCESSMASK ...
#define ATTR_CMN_ERROR ...
#define ATTR_CMN_RETURNED_ATTRS ...
#define ATTR_FILE_DATALENGTH ...
#define VREG ...
#define VDIR ...
#define VLNK ...
#define VBLK ...
#define VCHR ...
#define VFIFO ...
#define VSOCK ...
#define S_IFMT ...
int open(const char *path, int oflag, int perm);
int close(int);
#define O_RDONLY ...
'''
)
if __name__ == '__main__':
ffi.compile()