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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.
130 lines
4.7 KiB
C
130 lines
4.7 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/struct/iovec.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/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/macros.internal.h"
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#include "libc/sysv/consts/iov.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.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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static bool once, demodernize;
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int i, err;
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ssize_t rc;
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size_t sent, toto;
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if (fd < 0) return einval();
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if (iovlen < 0) return einval();
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if (IsAsan() && !__asan_is_valid_iov(iov, iovlen)) return efault();
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if (fd < g_fds.n && g_fds.p[fd].kind == kFdZip) {
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return weaken(__zipos_write)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, iov, iovlen, off);
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} else if (IsWindows()) {
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if (fd < g_fds.n) {
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return sys_write_nt(fd, iov, iovlen, off);
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} else {
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return ebadf();
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}
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} else if (IsMetal()) {
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return enosys();
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}
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if (iovlen == 1) {
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return sys_pwrite(fd, iov[0].iov_base, iov[0].iov_len, off, off);
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}
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/*
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* NT, 2018-era XNU, and 2007-era Linux don't support this system call
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*/
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if (!once) {
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err = errno;
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rc = sys_pwritev(fd, iov, iovlen, off, off);
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if (rc == -1 && errno == ENOSYS) {
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errno = err;
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once = true;
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demodernize = true;
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STRACE("demodernizing %s() due to %s", "pwritev", "ENOSYS");
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} else {
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once = true;
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return rc;
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}
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}
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if (!demodernize) {
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return sys_pwritev(fd, iov, iovlen, off, off);
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}
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if (!iovlen) {
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return sys_pwrite(fd, NULL, 0, off, off);
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}
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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 && (errno == EINTR || errno == EAGAIN)) {
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return toto;
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} else {
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return -1;
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}
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}
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sent = rc;
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toto += 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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* @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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rc = Pwritev(fd, iov, iovlen, off);
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#if defined(SYSDEBUG) && _DATATRACE
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if (UNLIKELY(__strace > 0)) {
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kprintf(STRACE_PROLOGUE "pwritev(%d, ", fd);
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DescribeIov(iov, iovlen, rc != -1 ? rc : 0);
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kprintf(", %d, %'ld) → %'ld% m\n", iovlen, off, rc);
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}
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#endif
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return rc;
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}
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