syscalls: mkdir and chroot

src/sys/syscalls/chroot.c

@@ -0,0 +1,52 @@
+#include <kernel/syscalls.h>
+#include <kernel/vfs.h>
+#include <kernel/sched.h>
+#include <kernel/vmm.h>
+#include <arch/cls.h>
+
+syscallret syscall_chroot(const char* path){
+
+	syscallret retv;
+	retv.ret = -1;
+
+	if(path > USER_SPACE_END){
+		retv.errno = EFAULT;
+		return retv;
+	}
+	
+	size_t len = strlen(path);
+
+	char buff[len+1];
+	
+	strcpy(buff, path);
+
+	proc_t* proc = arch_getcls()->thread->proc;
+
+	vnode_t* vnode;
+
+	retv.errno = vfs_open(&vnode,
+		buff[0] == '/' ? proc->root : proc->cwd,
+		buff
+	);
+
+	if(retv.errno)
+		return retv;
+	
+	if(GETTYPE(vnode->st.st_mode) != TYPE_DIR){
+		retv.errno = ENOTDIR;
+		goto _ret;
+	}
+
+	dirnode_t* oldroot = proc->root;
+	proc->root = (dirnode_t*)vnode;
+
+	retv.errno = 0;
+	retv.ret = 0;
+
+	_ret:
+		
+	vfs_close(vnode);
+
+	return retv;
+	
+}