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d1d4388201
It hasn't been helpful enough to be justify the maintenance burden. What actually does help is mprotect(), kprintf(), --ftrace and --strace which can always be counted upon to work correctly. We aren't losing much with this change. Support for ASAN on AARCH64 was never implemented. Applying ASAN to the core libc runtimes was disabled many months ago. If there is some way to have an ASAN runtime for user programs that is less invasive we can potentially consider reintroducing support. But now is premature.
60 lines
3.4 KiB
C
60 lines
3.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/runtime/zipos.internal.h"
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#include "libc/sysv/consts/at.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Renames files relative to directories.
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*
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* This is generally an atomic operation with the file system, since all
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* it's doing is changing a name associated with an inode. However, that
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* means rename() doesn't permit your `oldpathname` and `newpathname` to
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* be on separate file systems, in which case this returns EXDEV. That's
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* also the case on Windows.
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*
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* @param olddirfd is normally AT_FDCWD but if it's an open directory
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* and oldpath is relative, then oldpath become relative to dirfd
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* @param newdirfd is normally AT_FDCWD but if it's an open directory
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* and newpath is relative, then newpath become relative to dirfd
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* @return 0 on success, or -1 w/ errno
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*/
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int renameat(int olddirfd, const char *oldpath, int newdirfd,
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const char *newpath) {
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int rc;
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if (_weaken(__zipos_notat) &&
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((rc = __zipos_notat(olddirfd, oldpath)) == -1 ||
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(rc = __zipos_notat(newdirfd, newpath)) == -1)) {
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STRACE("zipos renameat not supported yet");
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} else if (!IsWindows()) {
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rc = sys_renameat(olddirfd, oldpath, newdirfd, newpath);
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} else {
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rc = sys_renameat_nt(olddirfd, oldpath, newdirfd, newpath);
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}
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STRACE("renameat(%s, %#s, %s, %#s) → %d% m", DescribeDirfd(olddirfd), oldpath,
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DescribeDirfd(newdirfd), newpath, rc);
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return rc;
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}
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