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https://github.com/jart/cosmopolitan.git
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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.
91 lines
4.1 KiB
C
91 lines
4.1 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/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/cp.internal.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/fd.internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/calls/struct/iovec.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/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/stdio/sysparam.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Writes to file at offset.
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*
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* This function never changes the current position of `fd`.
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*
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* @param fd is something open()'d earlier, noting pipes might not work
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* @param buf is copied from, cf. copy_file_range(), sendfile(), etc.
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* @param size is always saturated to 0x7ffff000 automatically
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* @param offset is bytes from start of file at which write begins,
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* which can exceed or overlap the end of file, in which case your
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* file will be extended
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* @return [1..size] bytes on success, or -1 w/ errno; noting zero is
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* impossible unless size was passed as zero to do an error check
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* @see pread(), write()
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* @cancelationpoint
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* @asyncsignalsafe
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* @vforksafe
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*/
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ssize_t pwrite(int fd, const void *buf, size_t size, int64_t offset) {
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ssize_t rc;
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size_t wrote;
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BEGIN_CANCELATION_POINT;
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// XNU and BSDs will EINVAL if requested bytes exceeds INT_MAX
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// this is inconsistent with Linux which ignores huge requests
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size = MIN(size, 0x7ffff000);
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if (offset < 0) {
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rc = einval();
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} else if (fd == -1) {
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rc = ebadf();
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} else if (__isfdkind(fd, kFdZip)) {
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rc = ebadf();
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} else if (!IsWindows()) {
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rc = sys_pwrite(fd, buf, size, offset, offset);
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} else if (__isfdkind(fd, kFdSocket)) {
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rc = espipe();
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} else if (__isfdkind(fd, kFdFile) || __isfdkind(fd, kFdDevNull) ||
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__isfdkind(fd, kFdDevRandom)) {
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rc = sys_write_nt(fd, (struct iovec[]){{(void *)buf, size}}, 1, offset);
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} else {
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return ebadf();
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}
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if (rc != -1) {
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wrote = (size_t)rc;
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if (!wrote) {
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npassert(size == 0);
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} else {
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npassert(wrote <= size);
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}
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}
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END_CANCELATION_POINT;
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DATATRACE("pwrite(%d, %#.*hhs%s, %'zu, %'zd) → %'zd% m", fd,
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MAX(0, MIN(40, rc)), buf, rc > 40 ? "..." : "", size, offset, rc);
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return rc;
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}
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__weak_reference(pwrite, pwrite64);
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