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4731
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1 /* xgetdomainname.c -- Return the NIS domain name, without size limitations. |
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2 Copyright (C) 1992, 1996, 2000, 2001, 2003 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 Foundation, |
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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17 |
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18 /* Based on xgethostname.c, written by Jim Meyering. */ |
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19 |
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20 #ifdef HAVE_CONFIG_H |
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21 # include <config.h> |
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22 #endif |
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23 |
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24 /* Specification. */ |
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25 #include "xgetdomainname.h" |
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26 |
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27 /* Get getdomainname. */ |
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28 #include "getdomainname.h" |
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29 |
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30 /* Get errno. */ |
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31 #include <errno.h> |
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32 |
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33 #include "xalloc.h" |
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34 |
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35 #ifndef INITIAL_DOMAINNAME_LENGTH |
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36 # define INITIAL_DOMAINNAME_LENGTH 34 |
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37 #endif |
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38 |
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39 /* Return the NIS domain name of the machine, in malloc'd storage. |
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40 WARNING! The NIS domain name is unrelated to the fully qualified host name |
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41 of the machine. It is also unrelated to email addresses. |
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42 WARNING! The NIS domain name is usually the empty string or "(none)" when |
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43 not using NIS. |
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44 If malloc fails, exit. |
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45 Upon any other failure, set errno and return NULL. */ |
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46 char * |
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47 xgetdomainname (void) |
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48 { |
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49 char *domainname; |
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50 size_t size; |
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51 |
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52 size = INITIAL_DOMAINNAME_LENGTH; |
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53 domainname = xmalloc (size); |
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54 while (1) |
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55 { |
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56 int k = size - 1; |
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57 int err; |
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58 |
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59 errno = 0; |
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60 domainname[k] = '\0'; |
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61 err = getdomainname (domainname, size); |
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62 if (err >= 0 && domainname[k] == '\0') |
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63 break; |
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64 else if (err < 0 && errno != EINVAL) |
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65 { |
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66 int saved_errno = errno; |
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67 free (domainname); |
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68 errno = saved_errno; |
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69 return NULL; |
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70 } |
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71 size *= 2; |
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72 domainname = xrealloc (domainname, size); |
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73 } |
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74 |
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75 return domainname; |
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76 } |
