sysinfo pass, make grade 40/40

Makefile

@@ -189,6 +189,7 @@ UPROGS=\
 	$U/_wc\
 	$U/_zombie\
 	$U/_trace\
+	$U/_sysinfotest\
 
 
 

kernel/defs.h

@@ -63,6 +63,7 @@ void            ramdiskrw(struct buf*);
 void*           kalloc(void);
 void            kfree(void *);
 void            kinit(void);
+int             size_of_freemem(void);
 
 // log.c
 void            initlog(int, struct superblock*);
@@ -106,6 +107,7 @@ void            yield(void);
 int             either_copyout(int user_dst, uint64 dst, void *src, uint64 len);
 int             either_copyin(void *dst, int user_src, uint64 src, uint64 len);
 void            procdump(void);
+int             number_of_process(void);
 
 // swtch.S
 void            swtch(struct context*, struct context*);

kernel/kalloc.c

@@ -80,3 +80,18 @@ kalloc(void)
     memset((char*)r, 5, PGSIZE); // fill with junk
   return (void*)r;
 }
+
+int
+size_of_freemem(void)
+{
+  struct run *r;
+  int count = 0;
+  acquire(&kmem.lock);
+  r = kmem.freelist;
+  while (r) {
+    count ++;
+    r = r->next;
+  }
+  release(&kmem.lock);
+  return count * PGSIZE;
+}

kernel/proc.c

@@ -681,3 +681,14 @@ procdump(void)
     printf("\n");
   }
 }
+
+int
+number_of_process(void)
+{
+  struct proc *p;
+  int count = 0;
+  for (p = proc; p < &proc[NPROC]; p ++) {
+    if (p->state != UNUSED) count ++;
+  }
+  return count;
+}

kernel/syscall.c

@@ -102,6 +102,7 @@ extern uint64 sys_link(void);
 extern uint64 sys_mkdir(void);
 extern uint64 sys_close(void);
 extern uint64 sys_trace(void);
+extern uint64 sys_sysinfo(void);
 
 // An array mapping syscall numbers from syscall.h
 // to the function that handles the system call.
@@ -128,6 +129,7 @@ static uint64 (*syscalls[])(void) = {
 [SYS_mkdir]   sys_mkdir,
 [SYS_close]   sys_close,
 [SYS_trace]   sys_trace,
+[SYS_sysinfo] sys_sysinfo,
 };
 
 char syscall_name[][8] = {

kernel/sysproc.c

@@ -5,6 +5,7 @@
 #include "memlayout.h"
 #include "spinlock.h"
 #include "proc.h"
+#include "sysinfo.h"
 
 uint64
 sys_exit(void)
@@ -102,3 +103,20 @@ sys_trace(void)
   release(&myproc()->lock);
   return 0;
 }
+
+uint64
+sys_sysinfo(void)
+{
+  struct sysinfo info;
+  uint64 addr;
+  argaddr(0, &addr);
+  info.nproc = number_of_process();
+  info.freemem = size_of_freemem();
+  acquire(&myproc()->lock);
+  if(copyout(myproc()->pagetable, addr, (char *)&info, sizeof(info)) < 0){
+    release(&myproc()->lock);
+    return -1;
+  }
+  release(&myproc()->lock);
+  return 0;
+}

time.txt

@@ -0,0 +1 @@
+3

user/user.h

@@ -1,4 +1,5 @@
 struct stat;
+struct sysinfo;
 
 // system calls
 int fork(void);
@@ -23,6 +24,7 @@ char* sbrk(int);
 int sleep(int);
 int uptime(void);
 int trace(int);
+int sysinfo(struct sysinfo*);
 
 // ulib.c
 int stat(const char*, struct stat*);

user/usys.pl

@@ -37,3 +37,4 @@ entry("sbrk");
 entry("sleep");
 entry("uptime");
 entry("trace");
+entry("sysinfo");