Merge branch 'cow' into net

Conflicts:
	.gitignore
	Makefile
	conf/lab.mk
	kernel/defs.h
	kernel/syscall.c
	kernel/vm.c
	user/pingpong.c
	user/user.h
	user/usys.pl

1 files changed, 24 insertions, 0 deletions

diff --git a/kernel/sysinfo.c b/kernel/sysinfo.c
new file mode 100644
index 0000000..c66324d
--- /dev/null
+++ b/kernel/sysinfo.c
@@ -0,0 +1,24 @@
+#include "types.h"
+#include "riscv.h"
+#include "param.h"
+#include "spinlock.h"
+#include "defs.h"
+#include "sysinfo.h"
+#include "proc.h"
+
+// Get current system info
+// addr is a user virtual address, pointing to a struct sysinfo.
+int
+sys_info(uint64 addr) {
+  struct proc *p = myproc();
+  struct sysinfo info;
+
+  // Fill nums into the sysinfo struct
+  info.freemem = get_freemem();
+  info.nproc = get_nproc();
+
+  if(copyout(p->pagetable, addr, (char *)&info, sizeof(info)) < 0)
+    return -1;
+  return 0;
+}
+