49 lines
791 B
C
49 lines
791 B
C
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/* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
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/* See COPYRIGHT */
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#include <u.h>
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#include <libc.h>
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#include <fcall.h>
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#include <fs.h>
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#include "fsimpl.h"
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long
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fspread(Fid *fid, void *buf, long n, vlong offset)
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{
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Fcall tx, rx;
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void *freep;
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tx.type = Tread;
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if(offset == -1){
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qlock(&fid->lk);
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tx.offset = fid->offset;
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qunlock(&fid->lk);
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}else
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tx.offset = offset;
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tx.count = n;
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fsrpc(fid->fs, &tx, &rx, &freep);
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if(rx.type == Rerror){
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werrstr("%s", rx.ename);
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free(freep);
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return -1;
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}
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if(rx.count){
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memmove(buf, rx.data, rx.count);
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if(offset == -1){
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qlock(&fid->lk);
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tx.offset += n;
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qunlock(&fid->lk);
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}
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}
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free(freep);
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return rx.count;
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}
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long
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fsread(Fid *fid, void *buf, long n)
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{
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return fspread(fid, buf, n, -1);
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}
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