source: svn/newcon3bcm2_21bu/nexus/lib/ipc/bipc_util.c

/******************************************************************************
 *    (c)2011 Broadcom Corporation
 *
 * This program is the proprietary software of Broadcom Corporation and/or its licensors,
 * and may only be used, duplicated, modified or distributed pursuant to the terms and
 * conditions of a separate, written license agreement executed between you and Broadcom
 * (an "Authorized License").  Except as set forth in an Authorized License, Broadcom grants
 * no license (express or implied), right to use, or waiver of any kind with respect to the
 * Software, and Broadcom expressly reserves all rights in and to the Software and all
 * intellectual property rights therein.  IF YOU HAVE NO AUTHORIZED LICENSE, THEN YOU
 * HAVE NO RIGHT TO USE THIS SOFTWARE IN ANY WAY, AND SHOULD IMMEDIATELY
 * NOTIFY BROADCOM AND DISCONTINUE ALL USE OF THE SOFTWARE.
 *
 * Except as expressly set forth in the Authorized License,
 *
 * 1.     This program, including its structure, sequence and organization, constitutes the valuable trade
 * secrets of Broadcom, and you shall use all reasonable efforts to protect the confidentiality thereof,
 * and to use this information only in connection with your use of Broadcom integrated circuit products.
 *
 * 2.     TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
 * AND WITH ALL FAULTS AND BROADCOM MAKES NO PROMISES, REPRESENTATIONS OR
 * WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
 * THE SOFTWARE.  BROADCOM SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED WARRANTIES
 * OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE,
 * LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION
 * OR CORRESPONDENCE TO DESCRIPTION. YOU ASSUME THE ENTIRE RISK ARISING OUT OF
 * USE OR PERFORMANCE OF THE SOFTWARE.
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 * 3.     TO THE MAXIMUM EXTENT PERMITTED BY LAW, IN NO EVENT SHALL BROADCOM OR ITS
 * LICENSORS BE LIABLE FOR (i) CONSEQUENTIAL, INCIDENTAL, SPECIAL, INDIRECT, OR
 * EXEMPLARY DAMAGES WHATSOEVER ARISING OUT OF OR IN ANY WAY RELATING TO YOUR
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 * LIMITATIONS SHALL APPLY NOTWITHSTANDING ANY FAILURE OF ESSENTIAL PURPOSE OF
 * ANY LIMITED REMEDY.
 *
 * $brcm_Workfile: bipc_util.c $
 * $brcm_Revision: 1 $
 * $brcm_Date: 10/4/11 5:44p $
 *
 * Module Description:
 *
 * Revision History:
 *
 * $brcm_Log: /nexus/lib/ipc/bipc_util.c $
 * 
 * 1   10/4/11 5:44p vsilyaev
 * SW7425-1364: Reference applicaion IPC and reference server
 * 
 *****************************************************************************/
#include "bstd.h"
#include "bipc_impl.h"
#include <unistd.h>
#include <errno.h>

BDBG_MODULE(bipc_util);

int b_safe_write(int fd, const void *buf, size_t buf_size)
{
    int result;

    for(result=0;;) {
        int rc;
        if(buf_size==0) {
            break;
        }
        rc = write(fd, buf, buf_size);
        if(rc>0) {
            BDBG_ASSERT((unsigned)rc<=buf_size);
            result += rc;
            if((unsigned)rc==buf_size) {
                break;
            }
            BDBG_ASSERT((unsigned)rc<=buf_size);
            buf_size -= rc;
            buf = (uint8_t *)buf + rc;
        } else {
            rc = errno;
            if(rc==EINTR) {
                continue;
            } else if((rc==EAGAIN || rc==EWOULDBLOCK) && result==0) {
                break;
            } else {
                result = -rc;
                break;
            }
        }
    }
    return result;
}

int b_safe_read(int fd, void *buf, size_t buf_size)
{
    int result;
    for(result=0;;) {
        int rc;
        if(buf_size==0) {
            break;
        }
        rc = read(fd, buf, buf_size);
        if(rc>0) {
            BDBG_ASSERT((unsigned)rc<=buf_size);
            result += rc;
            if((unsigned)rc==buf_size) {
                break;
            }
            BDBG_ASSERT((unsigned)rc<=buf_size);
            buf_size -= rc;
            buf = (uint8_t *)buf + rc;
        } else {
            if(rc==0) {
                result = -BERR_END_OF_FILE;
                break;
            }
            rc = errno;
            if(rc==EINTR) {
                continue;
            } else if((rc==EAGAIN || rc==EWOULDBLOCK) && result==0) {
                break;
            } else {
                result = -rc;
                break;
            }
        }
    }
    return result;
}