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annotate lib/getgroups.c @ 16229:daac1ca4c436

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inttypes: Modernize. * lib/inttypes.in.h (strtoimax, strtoumax): Use the C++ safe idioms. * modules/inttypes-incomplete (Depends-on): Add snippet/c++defs. (Makefile.am): Update inttypes.h rule.
author Bruno Haible <bruno@clisp.org>
date Thu, 05 Jan 2012 18:42:08 +0100
parents 8250f2777afc
children e542fd46ad6f
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1 /* provide consistent interface to getgroups for systems that don't allow N==0
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2
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3 Copyright (C) 1996, 1999, 2003, 2006-2012 Free Software Foundation, Inc.
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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17
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18 /* written by Jim Meyering */
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19
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20 #include <config.h>
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21
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22 #include <unistd.h>
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23
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24 #include <errno.h>
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25 #include <stdlib.h>
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26 #include <stdint.h>
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27
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28 #if !HAVE_GETGROUPS
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29
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30 /* Provide a stub that fails with ENOSYS, since there is no group
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31 information available on mingw. */
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32 int
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33 getgroups (int n _GL_UNUSED, GETGROUPS_T *groups _GL_UNUSED)
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34 {
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35 errno = ENOSYS;
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36 return -1;
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37 }
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38
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39 #else /* HAVE_GETGROUPS */
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40
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41 # undef getgroups
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42 # ifndef GETGROUPS_ZERO_BUG
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43 # define GETGROUPS_ZERO_BUG 0
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44 # endif
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45
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46 /* On at least Ultrix 4.3 and NextStep 3.2, getgroups (0, NULL) always
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47 fails. On other systems, it returns the number of supplemental
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48 groups for the process. This function handles that special case
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49 and lets the system-provided function handle all others. However,
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50 it can fail with ENOMEM if memory is tight. It is unspecified
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51 whether the effective group id is included in the list. */
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52
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53 int
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54 rpl_getgroups (int n, gid_t *group)
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55 {
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56 int n_groups;
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57 GETGROUPS_T *gbuf;
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58 int saved_errno;
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59
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60 if (n < 0)
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61 {
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62 errno = EINVAL;
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63 return -1;
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64 }
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65
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66 if (n != 0 || !GETGROUPS_ZERO_BUG)
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67 {
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68 int result;
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69 if (sizeof *group == sizeof *gbuf)
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70 return getgroups (n, (GETGROUPS_T *) group);
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71
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72 if (SIZE_MAX / sizeof *gbuf <= n)
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73 {
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74 errno = ENOMEM;
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75 return -1;
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76 }
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77 gbuf = malloc (n * sizeof *gbuf);
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78 if (!gbuf)
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79 return -1;
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80 result = getgroups (n, gbuf);
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81 if (0 <= result)
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82 {
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83 n = result;
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84 while (n--)
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85 group[n] = gbuf[n];
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86 }
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87 saved_errno = errno;
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88 free (gbuf);
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89 errno == saved_errno;
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90 return result;
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91 }
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92
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93 n = 20;
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94 while (1)
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95 {
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96 /* No need to worry about address arithmetic overflow here,
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97 since the ancient systems that we're running on have low
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98 limits on the number of secondary groups. */
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99 gbuf = malloc (n * sizeof *gbuf);
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100 if (!gbuf)
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101 return -1;
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102 n_groups = getgroups (n, gbuf);
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103 if (n_groups == -1 ? errno != EINVAL : n_groups < n)
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104 break;
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105 free (gbuf);
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106 n *= 2;
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107 }
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108
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109 saved_errno = errno;
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110 free (gbuf);
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111 errno = saved_errno;
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112
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113 return n_groups;
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114 }
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115
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116 #endif /* HAVE_GETGROUPS */