mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
ebf784d4f5
- Introduce ualarm() function - Make rename() report EISEMPTY on Windows - Always raise EINVAL upon open(O_RDONLY|O_TRUNC) - Add macro so ./configure will detect SOCK_CLOEXEC - Fix O_TRUNC without O_CREAT not working on Windows - Let fcntl(F_SETFL) change O_APPEND status on Windows - Make sure pwrite() / pread() report ESPIPE on sockets - Raise ESPIPE on Windows when pwrite() is used on pipe - Properly compute O_APPEND CreateFile() flags on Windows - Don't require O_DIRECTORY to open directories on Windows - Fix more instances of Windows reporting EISDIR and ENOTDIR - Normalize EFTYPE and EMLINK to ELOOP on NetBSD and FreeBSD - Make unlink() / rmdir() work on read-only files on Windows - Validate UTF-8 on Windows paths to fix bug with overlong NUL - Always print signal name to stderr when crashing due to SIG_DFL - Fix Windows bug where denormalized paths >260 chars didn't work - Block signals on BSDs when thread exits before trashing its own stack
131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set 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/cp.internal.h"
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#include "libc/calls/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/calls/syscall_support-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/likely.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/sysv/errfuns.h"
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static ssize_t Pwritev(int fd, const struct iovec *iov, int iovlen,
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int64_t off) {
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int i, e;
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size_t sent;
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ssize_t rc, toto;
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if (fd < 0) {
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return ebadf();
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}
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if (iovlen < 0) {
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return einval();
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}
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if (IsAsan() && !__asan_is_valid_iov(iov, iovlen)) {
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return efault();
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}
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if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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return ebadf();
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}
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if (IsWindows()) {
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if (fd < g_fds.n) {
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if (g_fds.p[fd].kind == kFdSocket) {
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return espipe();
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} else {
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return sys_write_nt(fd, iov, iovlen, off);
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}
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} else {
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return ebadf();
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}
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}
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if (IsMetal()) {
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return espipe(); // must be serial or console if not zipos
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}
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while (iovlen && !iov->iov_len) {
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--iovlen;
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++iov;
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}
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if (!iovlen) {
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return sys_pwrite(fd, 0, 0, off, off);
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}
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if (iovlen == 1) {
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return sys_pwrite(fd, iov->iov_base, iov->iov_len, off, off);
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}
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e = errno;
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rc = sys_pwritev(fd, iov, iovlen, off, off);
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if (rc != -1 || errno != ENOSYS) return rc;
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errno = e;
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for (toto = i = 0; i < iovlen; ++i) {
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rc = sys_pwrite(fd, iov[i].iov_base, iov[i].iov_len, off, off);
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if (rc == -1) {
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if (!toto) {
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toto = -1;
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} else if (errno != EINTR) {
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notpossible;
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}
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break;
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}
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sent = rc;
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toto += sent;
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off += sent;
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if (sent != iov[i].iov_len) {
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break;
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}
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}
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return toto;
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}
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/**
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* Writes data from multiple buffers to offset.
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*
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* Please note that it's not an error for a short write to happen. This
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* can happen in the kernel if EINTR happens after some of the write has
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* been committed. It can also happen if we need to polyfill this system
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* call using pwrite().
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*
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* @return number of bytes actually sent, or -1 w/ errno
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* @cancellationpoint
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* @asyncsignalsafe
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* @vforksafe
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*/
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ssize_t pwritev(int fd, const struct iovec *iov, int iovlen, int64_t off) {
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ssize_t rc;
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BEGIN_CANCELLATION_POINT;
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rc = Pwritev(fd, iov, iovlen, off);
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END_CANCELLATION_POINT;
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STRACE("pwritev(%d, %s, %d, %'ld) → %'ld% m", fd,
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DescribeIovec(rc != -1 ? rc : -2, iov, iovlen), iovlen, off, rc);
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return rc;
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}
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