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/* ========================================================================
* Copyright 1988-2006 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* ========================================================================
*/
/*
* Program: Write data, treating partial writes as an error
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 26 May 1995
* Last Edited: 30 August 2006
*/
/* The whole purpose of this unfortunate routine is to deal with DOS and
* certain cretinous versions of UNIX which decided that the "bytes actually
* written" return value from write() gave them license to use that for things
* that are really errors, such as disk quota exceeded, maximum file size
* exceeded, disk full, etc.
*
* BSD won't screw us this way on the local filesystem, but who knows what
* some NFS-mounted filesystem will do.
*/
#undef write
/* Write data to file
* Accepts: file descriptor
* I/O vector structure
* number of vectors in structure
* Returns: number of bytes written if successful, -1 if failure
*/
long maxposint = (long)((((unsigned long) 1) << ((sizeof(int) * 8) - 1)) - 1);
long safe_write (int fd,char *buf,long nbytes)
{
long i,j;
if (nbytes > 0) for (i = nbytes; i; i -= j,buf += j) {
while (((j = write (fd,buf,(int) min (maxposint,i))) < 0) &&
(errno == EINTR));
if (j < 0) return j;
}
return nbytes;
}
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