58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
/* @(#)nixread.c 1.14 09/06/30 Copyright 1986, 1996-2009 J. Schilling */
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/*
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* Non interruptable extended read
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*
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* Copyright (c) 1986, 1996-2009 J. Schilling
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*/
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/*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* See the file CDDL.Schily.txt in this distribution for details.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file CDDL.Schily.txt from this distribution.
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*/
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#include "schilyio.h"
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EXPORT ssize_t
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_nixread(f, buf, count)
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int f;
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void *buf;
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size_t count;
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{
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register char *p = (char *)buf;
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register ssize_t ret;
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register int total = 0;
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int oerrno = geterrno();
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if ((ret = (ssize_t)count) < 0) {
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seterrno(EINVAL);
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return ((ssize_t)-1);
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}
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while (count > 0) {
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while ((ret = read(f, p, count)) < 0) {
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if (geterrno() == EINTR) {
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/*
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* Set back old 'errno' so we don't change the
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* errno visible to the outside if we did
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* not fail.
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*/
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seterrno(oerrno);
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continue;
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}
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return (ret); /* Any other error */
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}
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if (ret == 0) /* Something went wrong */
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break;
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total += ret;
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count -= ret;
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p += ret;
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}
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return (total);
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}
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