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Diffstat (limited to 'libc/pwd_grp/initgroups.c')
-rw-r--r--libc/pwd_grp/initgroups.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/libc/pwd_grp/initgroups.c b/libc/pwd_grp/initgroups.c
new file mode 100644
index 000000000..35e1d03ec
--- /dev/null
+++ b/libc/pwd_grp/initgroups.c
@@ -0,0 +1,80 @@
+/*
+ * initgroups.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 <fcntl.h>
+#include <grp.h>
+#include "config.h"
+
+int
+initgroups(__const char * user, gid_t gid)
+{
+ register struct group * group;
+#ifndef GR_DYNAMIC_GROUP_LIST
+ gid_t group_list[GR_MAX_GROUPS];
+#else
+ gid_t * group_list=NULL;
+#endif
+ register char ** tmp_mem;
+ int num_groups;
+ int grp_fd;
+
+
+ if ((grp_fd=open("/etc/group", O_RDONLY))<0)
+ return -1;
+
+ num_groups=0;
+#ifdef GR_DYNAMIC_GROUP_LIST
+ group_list=(gid_t *) realloc(group_list, 1);
+#endif
+ group_list[num_groups]=gid;
+#ifndef GR_DYNAMIC_GROUP_LIST
+ while (num_groups<GR_MAX_GROUPS &&
+ (group=__getgrent(grp_fd))!=NULL)
+#else
+ while ((group=__getgrent(grp_fd))!=NULL)
+#endif
+ {
+ if (group->gr_gid!=gid);
+ {
+ tmp_mem=group->gr_mem;
+ while(*tmp_mem!=NULL)
+ {
+ if (!strcmp(*tmp_mem, user))
+ {
+ num_groups++;
+#ifdef GR_DYNAMIC_GROUP_LIST
+ group_list=(gid_t *)realloc(group_list,
+ num_groups*sizeof(gid_t *));
+#endif
+ group_list[num_groups]=group->gr_gid;
+ }
+ tmp_mem++;
+ }
+ }
+ }
+ close(grp_fd);
+ return setgroups(num_groups, group_list);
+}
+
+
+
+