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https://github.com/jart/cosmopolitan.git
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3e4fd4b0ad
This change also pays off some of the remaining technical debt with stdio, file descriptors, and memory managemnt polyfills.
56 lines
3.2 KiB
C
56 lines
3.2 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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/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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* 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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*/
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ssize_t writev(int fd, const struct iovec *iov, int iovlen) {
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if (fd < 0) return einval();
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if (iovlen < 0) return einval();
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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, -1);
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} else if (fd < g_fds.n && g_fds.p[fd].kind == kFdSerial) {
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return writev$serial(&g_fds.p[fd], iov, iovlen);
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} else if (!IsWindows()) {
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return writev$sysv(fd, iov, iovlen);
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} else if (fd < g_fds.n &&
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(g_fds.p[fd].kind == kFdFile || g_fds.p[fd].kind == kFdConsole)) {
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return write$nt(&g_fds.p[fd], iov, iovlen, -1);
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} else if (fd < g_fds.n && g_fds.p[fd].kind == kFdSocket) {
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return weaken(sendto$nt)(&g_fds.p[fd], iov, iovlen, 0, NULL, 0);
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} else {
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return ebadf();
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}
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}
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