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148
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1 /* safe-read.c -- an interface to read that retries after interrupts |
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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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223
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17 */ |
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148
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18 |
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19 #ifdef HAVE_CONFIG_H |
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20 #if defined (CONFIG_BROKETS) |
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21 /* We use <config.h> instead of "config.h" so that a compilation |
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22 using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h |
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23 (which it would do because it found this file in $srcdir). */ |
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24 #include <config.h> |
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25 #else |
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26 #include "config.h" |
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27 #endif |
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28 #endif |
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29 |
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30 #include <sys/types.h> |
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31 |
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32 #ifdef HAVE_UNISTD_H |
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33 #include <unistd.h> |
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34 #endif |
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35 |
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36 #include <errno.h> |
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37 #ifndef STDC_HEADERS |
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38 extern int errno; |
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39 #endif |
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40 |
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41 /* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted. |
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42 Return the actual number of bytes read, zero for EOF, or negative |
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43 for an error. */ |
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44 |
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45 int |
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46 safe_read (desc, ptr, len) |
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47 int desc; |
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48 char *ptr; |
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49 int len; |
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50 { |
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51 int n_chars; |
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52 |
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53 if (len <= 0) |
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54 return len; |
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55 |
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56 #ifdef EINTR |
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57 do |
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58 { |
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59 n_chars = read (desc, ptr, len); |
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60 } |
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61 while (n_chars < 0 && errno == EINTR); |
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62 #else |
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63 n_chars = read (desc, ptr, len); |
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64 #endif |
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65 |
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66 return n_chars; |
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67 } |
