pass fork flags to forkt

1fb7b9c5 · Nickolai Zeldovich · 296bdfb1 · 1fb7b9c5 · 1fb7b9c5 · 1fb7b9c5
--- a/include/user.h
+++ b/include/user.h
@@ -54,7 +54,7 @@ void free(void*);
 int atoi(const char*);

 // uthread.S
-int forkt(void *sp, void *pc, void *arg);
+int forkt(void *sp, void *pc, void *arg, int forkflags);
 void forkt_setup(u64 pid);

 // printf.c

--- a/lib/threads.cc
+++ b/lib/threads.cc
@@ -2,6 +2,7 @@
 #include "pthread.h"
 #include "user.h"
 #include "atomic.hh"
+#include "fcntl.h"

 enum { stack_size = 8192 };
 static std::atomic<int> nextkey;
@@ -22,7 +23,7 @@ pthread_create(pthread_t* tid, const pthread_attr_t* attr,
               void* (*start)(void*), void* arg)
 {
  char* base = (char*) sbrk(stack_size);
-  int t = forkt(base + stack_size, (void*) start, arg);
+  int t = forkt(base + stack_size, (void*) start, arg, FORK_SHARE_VMAP);
  if (t < 0)
    return t;


--- a/lib/uthread.S
+++ b/lib/uthread.S
@@ -12,7 +12,7 @@ forkt:
        movq %rdx, 0x00(%r12)   # arg
        movq %rsi, 0x08(%r12)   # function ptr

-        movq $1, %rdi           # flag for sys_fork
+        movq %rcx, %rdi         # flag for sys_fork
        movq $SYS_fork, %rax
        syscall