printf

convert userfs to use printf
bfree
ifree
writei
start on unlink

1 files changed, 27 insertions, 0 deletions

diff --git a/syscall.c b/syscall.c
index eb7ecf3..685fa46 100644
--- a/syscall.c
+++ b/syscall.c
@@ -331,6 +331,30 @@ sys_mknod(void)
 }
 
 int
+sys_unlink(void)
+{
+  struct proc *cp = curproc[cpu()];
+  struct inode *ip;
+  uint arg0;
+
+  if(fetcharg(0, &arg0) < 0)
+    return -1;
+
+  if(checkstring(arg0) < 0)
+    return -1;
+
+  ip = namei(cp->mem + arg0);
+  ip->nlink--;
+  if (ip->nlink <= 0) {
+    panic("sys_link: unimplemented\n");
+  }
+  iupdate(ip);
+  iput(ip);
+
+  return 0;
+}
+
+int
 sys_exec(void)
 {
   struct proc *cp = curproc[cpu()];
@@ -561,6 +585,9 @@ syscall(void)
   case SYS_mknod:
     ret = sys_mknod();
     break;
+  case SYS_unlink:
+    ret = sys_unlink();
+    break;
   default:
     cprintf("unknown sys call %d\n", num);
     // XXX fault