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258ce91f31
genrand.c will require it soon Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* Samba system utilities
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* Copyright (C) Andrew Tridgell 1992-1998
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* Copyright (C) Jeremy Allison 1998-2005
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* Copyright (C) Timur Bakeyev 2005
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* Copyright (C) Bjoern Jacke 2006-2007
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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; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/filesys.h"
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#include "lib/util/sys_rw_data.h"
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#include "lib/util/sys_rw.h"
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#include "lib/util/iov_buf.h"
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/****************************************************************************
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Write all data from an iov array
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NB. This can be called with a non-socket fd, don't add dependencies
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on socket calls.
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****************************************************************************/
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ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
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{
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ssize_t to_send;
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ssize_t thistime;
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size_t sent;
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struct iovec iov_copy[iovcnt];
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struct iovec *iov;
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to_send = iov_buflen(orig_iov, iovcnt);
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if (to_send == -1) {
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errno = EINVAL;
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return -1;
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}
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thistime = sys_writev(fd, orig_iov, iovcnt);
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if ((thistime <= 0) || (thistime == to_send)) {
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return thistime;
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}
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sent = thistime;
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/*
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* We could not send everything in one call. Make a copy of iov that
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* we can mess with.
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*/
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memcpy(iov_copy, orig_iov, sizeof(struct iovec) * iovcnt);
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iov = iov_copy;
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while (sent < to_send) {
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bool ok;
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ok = iov_advance(&iov, &iovcnt, thistime);
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if (!ok) {
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errno = EIO;
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return -1;
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}
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thistime = sys_writev(fd, iov, iovcnt);
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if (thistime <= 0) {
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break;
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}
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sent += thistime;
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}
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return sent;
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}
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/****************************************************************************
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Write data to a fd.
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NB. This can be called with a non-socket fd, don't add dependencies
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on socket calls.
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****************************************************************************/
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ssize_t write_data(int fd, const void *buffer, size_t n)
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{
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struct iovec iov;
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iov.iov_base = discard_const_p(void, buffer);
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iov.iov_len = n;
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return write_data_iov(fd, &iov, 1);
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}
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/*
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* Blocking read n bytes from a fd
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*/
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ssize_t read_data(int fd, void *buffer, size_t n)
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{
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ssize_t nread;
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nread = 0;
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while (nread < n) {
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ssize_t ret;
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ret = sys_read(fd, ((char *)buffer) + nread, n - nread);
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if (ret <= 0) {
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return ret;
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}
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nread += ret;
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}
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return nread;
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}
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