mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
6f7d0cb1c3
This makes breaking changes to add underscores to many non-standard function names provided by the c library. MODE=tiny is now tinier and we now use smaller locks that are better for tiny apps in this mode. Some headers have been renamed to be in the same folder as the build package, so it'll be easier to know which build dependency is needed. Certain old misguided interfaces have been removed. Intel intrinsics headers are now listed in libc/isystem (but not in the amalgamation) to help further improve open source compatibility. Header complexity has also been reduced. Lastly, more shell scripts are now available.
131 lines
4.8 KiB
C
131 lines
4.8 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/calls.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/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/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/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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