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d36d0634db
We now guarantee TMPDIR will be defined on a per build rule basis. It'll be an absolute path. It'll be secure and unique. It'll be rm -rf'd after the last shell script line in your build rule is executed. If $TMPDIR is already defined, then it'll be created as a subdirectory of your $TMPDIR and then replace the variable with the new definition. The Landlock Make repository will be updated with examples shortly after this change which shall be known as Landlock Make 1.1.1. See #530
56 lines
3 KiB
C
56 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net 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/strace.internal.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/asan.internal.h"
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#include "libc/intrin/describeflags.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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* Creates symbolic link.
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*
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* This is like link() but adds a tiny indirection to make the fact that
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* the file is a link obvious. It also enables certain other features,
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* like the ability to be broken.
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*
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* @param target can be relative and needn't exist
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* @param linkpath is what gets created
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* @return 0 on success, or -1 w/ errno
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* @raise EPERM if a non-admin on Windows NT tries to use this
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* @asyncsignalsafe
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*/
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int symlinkat(const char *target, int newdirfd, const char *linkpath) {
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int rc;
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if (IsAsan() &&
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(!__asan_is_valid(target, 1) || !__asan_is_valid(linkpath, 1))) {
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rc = efault();
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}
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if (!IsWindows()) {
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rc = sys_symlinkat(target, newdirfd, linkpath);
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} else {
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rc = sys_symlinkat_nt(target, newdirfd, linkpath);
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}
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STRACE("symlinkat(%#s, %s, %#s) → %d% m", target, DescribeDirfd(newdirfd),
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linkpath, rc);
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return rc;
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}
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