mirror of
https://github.com/jart/cosmopolitan.git
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e11fa30791
This way complex runtime features (e.g. ftrace, symbol tables) can always yoink zipos support. This is important now that apelink.com automates embedding symbol tables for multiple cpus.
124 lines
4.2 KiB
C
124 lines
4.2 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/kprintf.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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#include "libc/runtime/zipos.internal.h"
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static ssize_t Preadv(int fd, struct iovec *iov, int iovlen, int64_t off) {
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int e, i;
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size_t got;
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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 _weaken(__zipos_read)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, iov, iovlen, off);
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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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if (IsWindows()) {
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if (fd < g_fds.n) {
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return sys_read_nt(g_fds.p + fd, iov, iovlen, off);
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} else {
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return ebadf();
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}
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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_pread(fd, 0, 0, off, off);
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}
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if (iovlen == 1) {
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return sys_pread(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_preadv(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_pread(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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got = rc;
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toto += got;
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off += got;
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if (got != 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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* Reads with maximum generality.
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*
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* @return number of bytes actually read, 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 preadv(int fd, 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 = Preadv(fd, iov, iovlen, off);
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END_CANCELLATION_POINT;
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STRACE("preadv(%d, [%s], %d, %'ld) → %'ld% m", fd,
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DescribeIovec(rc, iov, iovlen), iovlen, off, rc);
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return rc;
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}
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