From: Matthias Kruk <m@m10k.eu>
Date: Wed, 13 Nov 2019 07:35:01 +0000 (+0900)
Subject: Add some methods for process_t types:
X-Git-Url: https://git.corax.cc/?a=commitdiff_plain;h=0bcb8dd9499348bffc7ed72aa93091930b033d08;p=corax

Add some methods for process_t types:
 - process_set_pagedir() / process_get_pagedir() - Convenience functions to access the process's pagedir
 - process_setuid() - Set the process's user id
 - process_setgid() - Set the process's group id
---

diff --git a/kernel/core/process.c b/kernel/core/process.c
index 710fc75..d1c860f 100644
--- a/kernel/core/process.c
+++ b/kernel/core/process.c
@@ -857,3 +857,61 @@ int process_suspend(process_t *proc)
 
 	return(ret_val);
 }
+
+int process_setuid(process_t *proc, uid_t uid)
+{
+	process_t *cproc;
+	int ret_val;
+
+	ret_val = -EINVAL;
+	cproc = process_get_current();
+
+	if(cproc) {
+		/* check if caller is allowed to do that */
+		ret_val = -EACCES;
+	}
+
+	return(ret_val);
+}
+
+int process_setgid(process_t *proc, gid_t gid)
+{
+	return(-ENOSYS);
+}
+
+int process_set_pagedir(process_t *proc, pg_dir_t *pd)
+{
+	int ret_val;
+
+	ret_val = -EINVAL;
+
+	if(proc && pd) {
+		/* FIXME: make sure none of the tasks are running */
+		proc->p_pgdir = pd;
+
+		/* FIXME: Set t_pgdir in all tasks */
+		proc->p_tasks->t_pgdir = (u32_t)pg_dir_get_pdbr(pd);
+
+		/*
+		 * TODO: The old page directory may still be referenced
+		 * by the tasks' return stacks. Should we handle that here?
+		 */
+		ret_val = 0;
+	}
+
+	return(ret_val);
+}
+
+int process_get_pagedir(process_t *proc, pg_dir_t **pd)
+{
+	int ret_val;
+
+	ret_val = -EINVAL;
+
+	if(proc && pd) {
+		*pd = proc->p_pgdir;
+		ret_val = 0;
+	}
+
+	return(ret_val);
+}
diff --git a/kernel/include/process.h b/kernel/include/process.h
index 03067e1..3e361fb 100644
--- a/kernel/include/process.h
+++ b/kernel/include/process.h
@@ -21,6 +21,7 @@
 
 #include <corax/types.h>
 #include <corax/ipc.h>
+#include <arch.h>
 
 #define PROC_ENTRY_FORK  ((void*)0)
 #define PROC_ENTRY_VFORK ((void*)1)
@@ -53,5 +54,10 @@ int           process_exit(process_t*, int);
 int           process_fork(int);
 int           process_detach(process_t*);
 int           process_suspend(process_t*);
+int           process_setuid(process_t*, uid_t);
+int           process_setgid(process_t*, gid_t);
+
+int           process_set_pagedir(process_t*, pg_dir_t*);
+int           process_get_pagedir(process_t*, pg_dir_t**);
 
 #endif /* __PROCESS_H */