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