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Support dirfd relative iops on Windows

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We always favor calling functions like openat(), fstatat(), etc. because
Linux, XNU, FreeBSD, and OpenBSD all elected to support them, while some
systems like Android love them so much, that they stopped supporting the
old interfaces.

This change ensures that when dirfd is actually a dirfd and not AT_FDCWD
we'll do the right thing on Windows NT. We use an API that's been around
since Vista to accomplish that.

This change also adds exponential backoff to chdir() on Windows since it
seems almost as flaky on Windows 7 as the rmdir() function.
This commit is contained in:
Justine Tunney 2021-01-30 01:49:43 -08:00
parent b8d26e2418
commit 417797d218
42 changed files with 361 additions and 241 deletions
Download patch file Download diff file Expand all files Collapse all files

2
libc/sysv/calls/fchdir-sysv.s Normal file
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@ -0,0 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall fchdir$sysv 0x000d000d200d0051 globl hidden

2
libc/sysv/calls/fchdir.s
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@ -1,2 +0,0 @@
.include "o/libc/sysv/macros.internal.inc"
.scall fchdir 0x000d000d200d0051 globl

2
libc/sysv/calls/mknodat.s
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@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall mknodat 0x014022ffffff0103 globl
.scall mknodat 0x0140022fffff0103 globl

4
libc/sysv/syscalls.sh
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@ -118,7 +118,7 @@ scall '__truncate$sysv' 0x00c801df20c8004c globl hidden # openbsd:pad
scall '__ftruncate$sysv' 0x00c901e020c9004d globl hidden # openbsd:pad
scall 'getcwd$sysv' 0x01300146ffff004f globl hidden
scall 'chdir$sysv' 0x000c000c200c0050 globl hidden
scall fchdir 0x000d000d200d0051 globl
scall 'fchdir$sysv' 0x000d000d200d0051 globl hidden
scall 'rename$sysv' 0x0080008020800052 globl hidden
scall 'mkdir$sysv' 0x0088008820880053 globl hidden
scall 'rmdir$sysv' 0x0089008920890054 globl hidden
@ -164,7 +164,7 @@ scall sigpending 0x003400342034007f globl
scall 'sigsuspend$sysv' 0x006f0155206f0082 globl hidden
scall sigaltstack 0x0120003520350083 globl
scall 'mknod$sysv' 0x000e000e200e0085 globl hidden
scall mknodat 0x014022ffffff0103 globl # FreeBSD 12+
scall mknodat 0x0140022fffff0103 globl # FreeBSD 12+
scall 'mkfifo$sysv' 0x008400842084ffff globl hidden
scall mkfifoat 0x013f01f1ffffffff globl
scall statfs 0x003f022b21590089 globl