mirror of
https://github.com/jart/cosmopolitan.git
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2046c0d2ae
- Expand redbean UNIX module - Expand redbean documentation - Ensure Lua copyright is embedded in binary - Increase the PATH_MAX limit especially on NT - Use column major sorting for linenoise completions - Fix some suboptimalities in redbean's new UNIX API - Figured out right flags for Multics newline in raw mode
89 lines
4 KiB
C
89 lines
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/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/strace.internal.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/kprintf.h"
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#include "libc/sock/internal.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Writes data from multiple buffers.
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*
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* This is the same thing as write() except it has multiple buffers.
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* This yields a performance boost in situations where it'd be expensive
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* to stitch data together using memcpy() or issuing multiple syscalls.
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* This wrapper is implemented so that writev() calls where iovlen<2 may
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* be passed to the kernel as write() instead. This yields a 100 cycle
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* performance boost in the case of a single small iovec.
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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 write().
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*
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* @return number of bytes actually handed off, or -1 w/ errno
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* @restartable
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*/
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ssize_t writev(int fd, const struct iovec *iov, int iovlen) {
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int i;
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ssize_t rc;
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if (fd >= 0 && iovlen >= 0) {
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if (IsAsan() && !__asan_is_valid_iov(iov, iovlen)) {
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rc = efault();
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} else if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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rc = weaken(__zipos_write)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, iov, iovlen, -1);
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} else if (!IsWindows() && !IsMetal()) {
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if (iovlen == 1) {
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rc = sys_write(fd, iov[0].iov_base, iov[0].iov_len);
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} else {
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rc = sys_writev(fd, iov, iovlen);
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}
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} else if (fd >= g_fds.n) {
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rc = ebadf();
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} else if (IsMetal()) {
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rc = sys_writev_metal(g_fds.p + fd, iov, iovlen);
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} else {
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rc = sys_writev_nt(fd, iov, iovlen);
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}
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} else {
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rc = einval();
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}
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#if defined(SYSDEBUG) && _DATATRACE
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if (__strace > 0) {
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if (rc == -1 && errno == EFAULT) {
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STRACE("writev(%d, %p, %d) → %'zd% m", fd, iov, iovlen, rc);
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} else {
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kprintf(STRACE_PROLOGUE "writev(%d, ", fd);
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__strace_iov(iov, iovlen, rc != -1 ? rc : 0);
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kprintf(", %d) → %'ld% m\n", iovlen, rc);
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}
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}
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#endif
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return rc;
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}
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