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1 /* ========================================================================
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2 * Copyright 1988-2006 University of Washington
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 *
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11 * ========================================================================
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12 */
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13
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14 /*
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15 * Program: Write data, treating partial writes as an error
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16 *
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17 * Author: Mark Crispin
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18 * Networks and Distributed Computing
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19 * Computing & Communications
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20 * University of Washington
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21 * Administration Building, AG-44
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22 * Seattle, WA 98195
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23 * Internet: MRC@CAC.Washington.EDU
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24 *
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25 * Date: 26 May 1995
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26 * Last Edited: 30 August 2006
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27 */
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28
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29 /* The whole purpose of this unfortunate routine is to deal with DOS and
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30 * certain cretinous versions of UNIX which decided that the "bytes actually
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31 * written" return value from write() gave them license to use that for things
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32 * that are really errors, such as disk quota exceeded, maximum file size
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33 * exceeded, disk full, etc.
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34 *
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35 * BSD won't screw us this way on the local filesystem, but who knows what
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36 * some NFS-mounted filesystem will do.
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37 */
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38
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39 #undef write
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40
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41 /* Write data to file
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42 * Accepts: file descriptor
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43 * I/O vector structure
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44 * number of vectors in structure
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45 * Returns: number of bytes written if successful, -1 if failure
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46 */
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47
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48 long maxposint = (long)((((unsigned long) 1) << ((sizeof(int) * 8) - 1)) - 1);
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49
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50 long safe_write (int fd,char *buf,long nbytes)
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51 {
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52 long i,j;
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53 if (nbytes > 0) for (i = nbytes; i; i -= j,buf += j) {
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54 while (((j = write (fd,buf,(int) min (maxposint,i))) < 0) &&
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55 (errno == EINTR));
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56 if (j < 0) return j;
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57 }
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58 return nbytes;
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59 }
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