[Minios-devel] [UNIKRAFT PATCH 6/6] lib/posix-user: Add more group file related functions

[Costin Lupu <costin.lupu@xxxxxxxxx>]

We currently provide only a single group. This can be extended easily,
if it will be needed.

Signed-off-by: Costin Lupu <costin.lupu@xxxxxxxxx>
---
 lib/posix-user/user.c | 64 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/lib/posix-user/user.c b/lib/posix-user/user.c
index 0d6ca3fb..004eee1b 100644
--- a/lib/posix-user/user.c
+++ b/lib/posix-user/user.c
@@ -60,6 +60,12 @@ UK_SLIST_HEAD(uk_entry_list, struct passwd_entry);
 
 static struct uk_entry_list passwds;
 
+static void init_groups(void);
+
+/*
+ * TODO make passwd management consistent with group management
+ */
+
 void __constructor init_ukunistd()
 {
        static struct passwd_entry p1;
@@ -77,6 +83,8 @@ void __constructor init_ukunistd()
 
        UK_SLIST_INIT(&passwds);
        UK_SLIST_INSERT_HEAD(&passwds, &p1, entries);
+
+       init_groups();
 }
 
 uid_t getuid(void)
@@ -328,3 +336,59 @@ int getgrnam_r(const char *name, struct group *grp,
 
        return 0;
 }
+
+struct group *getgrgid(gid_t gid)
+{
+       struct group *res;
+
+       if (gid == g__.gr_gid)
+               res = &g__;
+       else {
+               res = NULL;
+               errno = ENOENT;
+       }
+
+       return res;
+}
+
+static struct group_entry {
+       struct group *group;
+       UK_SLIST_ENTRY(struct group_entry) entries;
+} *groups_iter;
+
+UK_SLIST_HEAD(uk_group_entry_list, struct group_entry);
+
+static struct uk_group_entry_list groups;
+
+static void init_groups(void)
+{
+       static struct group_entry ge;
+
+       ge.group = &g__;
+       UK_SLIST_INIT(&groups);
+       UK_SLIST_INSERT_HEAD(&groups, &ge, entries);
+}
+
+void setgrent(void)
+{
+       groups_iter = UK_SLIST_FIRST(&groups);
+}
+
+void endgrent(void)
+{
+       setgrent();
+}
+
+struct group *getgrent(void)
+{
+       struct group *res;
+
+       if (groups_iter) {
+               res = groups_iter->group;
+               groups_iter = UK_SLIST_NEXT(groups_iter, entries);
+       } else
+               res = NULL;
+
+       return res;
+
+}
-- 
2.20.1


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