From 8b58e81077abf4e843873f16c03077e2fafce52d Mon Sep 17 00:00:00 2001
From: kaashoek <kaashoek>
Date: Wed, 23 Aug 2006 01:09:24 +0000
Subject: i/o redirection in sh better parsing of sh commands (copied from jos
 sh) cat: read from 1 if no args sbrk system call, but untested getpid system
 call moved locks in keyboard intr, but why do we get intr w. null characters
 from keyboard?

---
 syscall.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'syscall.c')

diff --git a/syscall.c b/syscall.c
index 80d5d8e..39c6821 100644
--- a/syscall.c
+++ b/syscall.c
@@ -140,6 +140,7 @@ sys_write(void)
     return -1;
   if(addr + n > p->sz)
     return -1;
+
   ret = fd_write(p->fds[fd], p->mem + addr, n);
   return ret;
 }
@@ -421,6 +422,7 @@ sys_dup(void)
     fd_close(fd1);
     return -1;
   }
+  cp->fds[ufd1] = fd1;
   fd1->type = cp->fds[fd]->type;
   fd1->readable = cp->fds[fd]->readable;
   fd1->writeable = cp->fds[fd]->writeable;
@@ -449,6 +451,27 @@ sys_link(void)
   return r;
 }
 
+int
+sys_getpid(void)
+{
+  struct proc *cp = curproc[cpu()];
+  return cp->pid;
+}
+
+
+int
+sys_sbrk(void)
+{
+  int r, n;
+  struct proc *cp = curproc[cpu()];
+
+  if(fetcharg(0, &n) < 0)
+    return -1;
+  r = growproc(n);
+  setupsegs(cp);  
+  return r;
+}
+
 int
 sys_exec(void)
 {
@@ -638,6 +661,12 @@ syscall(void)
   case SYS_dup:
     ret = sys_dup();
     break;
+  case SYS_getpid:
+    ret = sys_getpid();
+    break;
+  case SYS_sbrk:
+    ret = sys_sbrk();
+    break;
   default:
     cprintf("unknown sys call %d\n", num);
     // XXX fault
-- 
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