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Viewing changes to dttools/src/preadwrite.c

  • Committer: Bazaar Package Importer
  • Author(s): Michael Hanke
  • Date: 2011-05-07 09:05:00 UTC
  • Revision ID: james.westby@ubuntu.com-20110507090500-lqpmdtwndor6e7os
Tags: upstream-3.3.2
Import upstream version 3.3.2

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dttools/src/preadwrite.c
 
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/*
 
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Copyright (C) 2003-2004 Douglas Thain and the University of Wisconsin
 
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Copyright (C) 2005- The University of Notre Dame
 
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This software is distributed under the GNU General Public License.
 
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See the file COPYING for details.
 
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*/
 
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#include "preadwrite.h"
 
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#include <unistd.h>
 
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#include <errno.h>
 
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#include <sys/types.h>
 
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#ifndef HAS_PREAD
 
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ssize_t pread(int fd, void *data, size_t length, off_t offset )
 
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{
 
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        ssize_t result;
 
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        off_t save_offset;
 
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        int save_errno;
 
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        save_offset  = lseek(fd,offset,SEEK_SET);
 
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        if(save_offset==-1) return -1;
 
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        result = read(fd,data,length);
 
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        save_errno = errno;
 
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        lseek(fd, save_offset, SEEK_SET);
 
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        errno = save_errno;
 
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        return result;
 
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}
 
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#endif
 
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#ifndef HAS_PWRITE
 
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ssize_t pwrite(int fd, const void *data, size_t length, off_t offset )
 
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{
 
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        ssize_t result;
 
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        off_t save_offset;
 
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        int save_errno;
 
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        save_offset  = lseek(fd,offset,SEEK_SET);
 
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        if(save_offset==-1) return -1;
 
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        result = write(fd,data,length);
 
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        save_errno = errno;
 
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        lseek(fd, save_offset, SEEK_SET);
 
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        errno = save_errno;
 
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        return result;
 
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}
 
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#endif