niwrite.c

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/* @(#)niwrite.c    1.7 09/06/30 Copyright 1986, 2001-2009 J. Schilling */
/*
 *  Non interruptable write
 *
 *  Copyright (c) 1986, 2001-2009 J. Schilling
 */
/*
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * See the file CDDL.Schily.txt in this distribution for details.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file CDDL.Schily.txt from this distribution.
 */
 
#include "schilyio.h"
 
EXPORT ssize_t
_niwrite(f, buf, count)
    int f;
    void    *buf;
    size_t  count;
{
    ssize_t ret;
    int oerrno = geterrno();
 
    if ((ret = (ssize_t)count) < 0) {
        seterrno(EINVAL);
        return ((ssize_t)-1);
    }
    while ((ret = write(f, buf, count)) < 0 && geterrno() == EINTR) {
        /*
         * Set back old 'errno' so we don't change the errno visible
         * to the outside if we did not fail.
         */
        seterrno(oerrno);
    }
    return (ret);
}