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109 lines
1.9 KiB
C
109 lines
1.9 KiB
C
/**
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* @file
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*
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* @brief User Database Access Routines
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* @ingroup libcsupport
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*/
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/*
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* Copyright (c) 1999-2009 Ralf Corsepius <corsepiu@faw.uni-ulm.de>
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* Copyright (c) 1999-2013 Joel Sherrill <joel.sherrill@OARcorp.com>
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* Copyright (c) 2000-2001 Fernando Ruiz Casas <fernando.ruiz@ctv.es>
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* Copyright (c) 2002 Eric Norum <eric.norum@usask.ca>
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* Copyright (c) 2003 Till Straumann <strauman@slac.stanford.edu>
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* Copyright (c) 2012 Alex Ivanov <alexivanov97@gmail.com>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "pwdgrp.h"
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#include <stdlib.h>
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#include <pthread.h>
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typedef struct {
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FILE *fp;
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char buf[256];
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struct group grp;
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} grp_context;
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static pthread_once_t grp_once = PTHREAD_ONCE_INIT;
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static pthread_key_t grp_key;
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static void grp_init(void)
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{
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pthread_key_create(&grp_key, free);
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}
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static grp_context *grp_get_context(void)
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{
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pthread_once(&grp_once, grp_init);
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return pthread_getspecific(grp_key);
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}
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struct group *getgrent(void)
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{
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grp_context *ctx = grp_get_context();
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if (ctx == NULL)
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return NULL;
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if (ctx->fp == NULL)
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return NULL;
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if (!_libcsupport_scangr(ctx->fp, &ctx->grp, ctx->buf, sizeof(ctx->buf)))
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return NULL;
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return &ctx->grp;
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}
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void setgrent(void)
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{
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grp_context *ctx = grp_get_context();
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if (ctx == NULL) {
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int eno;
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ctx = calloc(1, sizeof(*ctx));
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if (ctx == NULL)
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return;
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eno = pthread_setspecific(grp_key, ctx);
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if (eno != 0) {
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free(ctx);
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return;
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}
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}
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_libcsupport_pwdgrp_init();
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if (ctx->fp != NULL)
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fclose(ctx->fp);
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ctx->fp = fopen("/etc/group", "r");
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}
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void endgrent(void)
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{
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grp_context *ctx = grp_get_context();
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if (ctx == NULL)
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return;
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if (ctx->fp != NULL) {
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fclose(ctx->fp);
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}
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free(ctx);
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pthread_setspecific(grp_key, NULL);
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}
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