Add close-on-exec flag for file descriptors.

I was surprised to find that dup()'ed fds don't share the close-on-exec flag.
That means it has to be stored separately from the FileDescriptor object.

2 files changed, 3 insertions, 0 deletions

diff --git a/LibC/fcntl.h b/LibC/fcntl.h
index e0ee379b1d..c717acdc1a 100644
--- a/LibC/fcntl.h
+++ b/LibC/fcntl.h
@@ -10,6 +10,8 @@ __BEGIN_DECLS
 #define F_GETFL 3
 #define F_SETFL 4
 
+#define FD_CLOEXEC 1
+
 int fcntl(int fd, int cmd, ...);
 
 __END_DECLS
diff --git a/LibC/unistd.h b/LibC/unistd.h
index a809a91151..431a5f17bc 100644
--- a/LibC/unistd.h
+++ b/LibC/unistd.h
@@ -99,6 +99,7 @@ int isatty(int fd);
 #define O_NONBLOCK 04000
 #define O_DIRECTORY 00200000
 #define O_NOFOLLOW 00400000
+#define O_CLOEXEC 02000000
 
 __END_DECLS