re PR go/67874 (fd_unix.go does not build when there is fcntl64 and no fcntl syscall)

	PR go/67874
    net, runtime: Call C library fcntl function rather than syscall.Syscall.
    
    Not all systems define a fcntl syscall; some only have fcntl64.
    
    Fixes GCC PR go/67874.
    
    Reviewed-on: https://go-review.googlesource.com/15497

From-SVN: r228576

1 files changed, 24 insertions, 0 deletions

diff --git a/libgo/runtime/go-varargs.c b/libgo/runtime/go-varargs.c
index 705f55e..7a2006f 100644
--- a/libgo/runtime/go-varargs.c
+++ b/libgo/runtime/go-varargs.c
@@ -6,6 +6,8 @@
 
 #include "config.h"
 
+#include <errno.h>
+#include <stdint.h>
 #include <sys/types.h>
 #include <fcntl.h>
 
@@ -32,6 +34,28 @@ __go_fcntl_flock (int fd, int cmd, struct flock *arg)
   return fcntl (fd, cmd, arg);
 }
 
+// This is for the net package.  We use uintptr_t to make sure that
+// the types match, since the Go and C "int" types are not the same.
+struct go_fcntl_ret {
+  uintptr_t r;
+  uintptr_t err;
+};
+
+struct go_fcntl_ret
+__go_fcntl_uintptr (uintptr_t fd, uintptr_t cmd, uintptr_t arg)
+{
+  int r;
+  struct go_fcntl_ret ret;
+
+  r = fcntl ((int) fd, (int) cmd, (int) arg);
+  ret.r = (uintptr_t) r;
+  if (r < 0)
+    ret.err = (uintptr_t) errno;
+  else
+    ret.err = 0;
+  return ret;
+}
+
 #ifdef HAVE_OPEN64
 
 int