/* * getgrnam.c - This file is part of the libc-8086/grp package for ELKS, * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <unistd.h> #include <string.h> #include <errno.h> #include <fcntl.h> #include <paths.h> #include "config.h" #ifdef __UCLIBC_HAS_THREADS__ #include <pthread.h> static pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER; # define LOCK pthread_mutex_lock(&mylock) # define UNLOCK pthread_mutex_unlock(&mylock); #else # define LOCK # define UNLOCK #endif static char *line_buff = NULL; static char **members = NULL; struct group *getgrnam(const char *name) { int grp_fd; struct group *group; if (name == NULL) { __set_errno(EINVAL); return NULL; } if ((grp_fd = open(_PATH_GROUP, O_RDONLY)) < 0) return NULL; LOCK; while ((group = __getgrent(grp_fd, line_buff, members)) != NULL) if (!strcmp(group->gr_name, name)) { close(grp_fd); UNLOCK; return group; } close(grp_fd); UNLOCK; return NULL; }