1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief User Database Access Routines |
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5 | * @ingroup libcsupport |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Copyright (c) 1999-2009 Ralf Corsepius <corsepiu@faw.uni-ulm.de> |
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10 | * Copyright (c) 1999-2013 Joel Sherrill <joel.sherrill@OARcorp.com> |
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11 | * Copyright (c) 2000-2001 Fernando Ruiz Casas <fernando.ruiz@ctv.es> |
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12 | * Copyright (c) 2002 Eric Norum <eric.norum@usask.ca> |
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13 | * Copyright (c) 2003 Till Straumann <strauman@slac.stanford.edu> |
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14 | * Copyright (c) 2012 Alex Ivanov <alexivanov97@gmail.com> |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.org/license/LICENSE. |
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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 "pwdgrp.h" |
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26 | |
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27 | #include <stdlib.h> |
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28 | #include <pthread.h> |
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29 | |
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30 | typedef struct { |
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31 | FILE *fp; |
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32 | char buf[256]; |
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33 | struct group grp; |
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34 | } grp_context; |
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35 | |
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36 | static pthread_once_t grp_once = PTHREAD_ONCE_INIT; |
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37 | |
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38 | static pthread_key_t grp_key; |
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39 | |
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40 | static void grp_init(void) |
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41 | { |
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42 | pthread_key_create(&grp_key, free); |
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43 | } |
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44 | |
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45 | static grp_context *grp_get_context(void) |
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46 | { |
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47 | pthread_once(&grp_once, grp_init); |
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48 | |
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49 | return pthread_getspecific(grp_key); |
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50 | } |
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51 | |
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52 | struct group *getgrent(void) |
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53 | { |
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54 | grp_context *ctx = grp_get_context(); |
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55 | |
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56 | if (ctx == NULL) |
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57 | return NULL; |
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58 | |
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59 | if (ctx->fp == NULL) |
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60 | return NULL; |
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61 | |
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62 | if (!_libcsupport_scangr(ctx->fp, &ctx->grp, ctx->buf, sizeof(ctx->buf))) |
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63 | return NULL; |
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64 | |
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65 | return &ctx->grp; |
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66 | } |
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67 | |
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68 | void setgrent(void) |
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69 | { |
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70 | grp_context *ctx = grp_get_context(); |
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71 | |
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72 | if (ctx == NULL) { |
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73 | int eno; |
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74 | |
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75 | ctx = calloc(1, sizeof(*ctx)); |
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76 | if (ctx == NULL) |
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77 | return; |
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78 | |
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79 | eno = pthread_setspecific(grp_key, ctx); |
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80 | if (eno != 0) { |
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81 | free(ctx); |
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82 | |
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83 | return; |
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84 | } |
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85 | } |
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86 | |
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87 | _libcsupport_pwdgrp_init(); |
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88 | |
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89 | if (ctx->fp != NULL) |
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90 | fclose(ctx->fp); |
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91 | |
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92 | ctx->fp = fopen("/etc/group", "r"); |
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93 | } |
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94 | |
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95 | void endgrent(void) |
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96 | { |
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97 | grp_context *ctx = grp_get_context(); |
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98 | int sc; |
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99 | |
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100 | if (ctx == NULL) |
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101 | return; |
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102 | |
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103 | if (ctx->fp != NULL) { |
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104 | fclose(ctx->fp); |
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105 | } |
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106 | |
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107 | free(ctx); |
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108 | sc = pthread_setspecific(grp_key, NULL); |
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109 | _Assert_Unused_variable_equals(sc, 0); |
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110 | } |
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