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Implement __zipos_dup (#972)

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* Implement __zipos_dup

Makes ZiposHandle reference-counted by an `rc` field in a union with its
freelist `next` pointer. The functions `__zipos_free` and `__zipos_keep`
function as incref/decref for it. Adds `__zipos_postdup` to fix metadata
on file descriptors after dup-like operations, and adds zipos support to
`sys_dup_nt` + `sys_close_nt`.

* Remove noop __zipos_postdup

rc is never a zipos file because it is always a previously unused file
descriptor. fd is never a zipos file because that case has been handled
above by __zipos_fcntl.
This commit is contained in:
Jōshin 2023-12-01 03:08:30 -05:00 • committed by GitHub
parent 6556dd2673
commit d1a745c17c
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11 changed files with 138 additions and 39 deletions
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5
libc/runtime/zipos.internal.h
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@ -20,8 +20,9 @@ struct ZiposHandle {
struct Zipos *zipos;
size_t size;
size_t mapsize;
size_t pos;
size_t cfile;
_Atomic(int) refs;
size_t pos; // TODO atomic
uint8_t *mem;
uint8_t data[];
};
@ -38,6 +39,7 @@ struct Zipos {
int __zipos_close(int);
void __zipos_free(struct ZiposHandle *);
struct ZiposHandle *__zipos_keep(struct ZiposHandle *);
struct Zipos *__zipos_get(void) pureconst;
size_t __zipos_normpath(char *, const char *, size_t);
ssize_t __zipos_find(struct Zipos *, struct ZiposUri *);
@ -45,6 +47,7 @@ ssize_t __zipos_scan(struct Zipos *, struct ZiposUri *);
ssize_t __zipos_parseuri(const char *, struct ZiposUri *);
uint64_t __zipos_inode(struct Zipos *, int64_t, const void *, size_t);
int __zipos_open(struct ZiposUri *, int);
void __zipos_postdup(int, int);
int __zipos_access(struct ZiposUri *, int);
int __zipos_stat(struct ZiposUri *, struct stat *);
int __zipos_fstat(struct ZiposHandle *, struct stat *);