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181
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1 /* full-write.c -- an interface to write that retries after interrupts |
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234
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2 Copyright (C) 1993, 1994 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; if not, write to the Free Software |
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16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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17 |
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18 Copied largely from GNU C's cccp.c. |
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19 */ |
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20 |
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21 #ifdef HAVE_CONFIG_H |
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22 #include <config.h> |
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23 #endif |
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24 |
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25 #include <sys/types.h> |
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26 |
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27 #ifdef HAVE_UNISTD_H |
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28 #include <unistd.h> |
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29 #endif |
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30 |
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31 #include <errno.h> |
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32 #ifndef errno |
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33 extern int errno; |
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34 #endif |
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35 |
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36 /* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted. |
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37 Return LEN upon success, write's (negative) error code otherwise. */ |
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38 |
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39 int |
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40 full_write (desc, ptr, len) |
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41 int desc; |
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42 char *ptr; |
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43 size_t len; |
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44 { |
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45 int total_written; |
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46 |
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47 total_written = 0; |
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48 while (len > 0) |
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49 { |
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50 int written = write (desc, ptr, len); |
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51 if (written < 0) |
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52 { |
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53 #ifdef EINTR |
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54 if (errno == EINTR) |
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55 continue; |
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56 #endif |
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57 return written; |
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58 } |
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59 total_written += written; |
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60 ptr += written; |
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61 len -= written; |
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62 } |
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63 return total_written; |
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64 } |
