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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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3
libc/runtime/zipos.S
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@ -33,6 +33,9 @@
.yoink __zipos_stat
.yoink __zipos_notat
.yoink __zipos_mmap
.yoink __zipos_postdup
.yoink __zipos_keep
.yoink __zipos_free
// TODO(jart): why does corruption happen when zip has no assets?
.yoink .cosmo