syscall lab finished

kernel/sysproc.c

@@ -5,6 +5,7 @@
 #include "memlayout.h"
 #include "spinlock.h"
 #include "proc.h"
+#include "sysinfo.h"
 
 uint64
 sys_exit(void)
@@ -101,3 +102,19 @@ sys_trace(void)
   myproc()->tracemask = n;
   return 0;
 }
+
+uint64
+sys_sysinfo(void)
+{
+  struct sysinfo info;
+  uint64 addr;
+  argaddr(0, &addr);
+  if (addr < 0) return -1;
+  struct proc* p = myproc();
+  info.nproc = proc_size();
+  info.freemem = freemem();
+  info.unused_proc_num = NPROC - info.nproc;
+  if (copyout(p->pagetable, addr, (char*)&info, sizeof(info)) < 0)
+    return -1;
+  return 0;
+}