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https://github.com/jart/cosmopolitan.git
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13ee75150c
This change turns symbol table compression back on using Puff, which noticeably reduces the size of programs like redbean and Python. The redbean web server receives some minor API additions for controlling things like SSL in addition to filling gaps in the documentation.
87 lines
4 KiB
C
87 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/likely.h"
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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/calls/syscall-sysv.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/describeflags.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 (UNLIKELY(__strace > 0)) {
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kprintf(STRACE_PROLOGUE "writev(%d, ", fd);
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DescribeIov(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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#endif
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return rc;
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}
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