buf fix: make FD.Read, FD.Write work for empty buffers
R=r
DELTA=8 (6 added, 0 deleted, 2 changed)
OCL=19273
CL=19275
diff --git a/src/lib/os/os_file.go b/src/lib/os/os_file.go
index ee4deef..2667a1e 100644
--- a/src/lib/os/os_file.go
+++ b/src/lib/os/os_file.go
@@ -57,7 +57,10 @@
if fd == nil {
return -1, EINVAL
}
- r, e := syscall.read(fd.fd, &b[0], int64(len(b)));
+ var r, e int64;
+ if len(b) > 0 { // because we access b[0]
+ r, e = syscall.read(fd.fd, &b[0], int64(len(b)));
+ }
return int(r), ErrnoToError(e)
}
@@ -65,7 +68,10 @@
if fd == nil {
return -1, EINVAL
}
- r, e := syscall.write(fd.fd, &b[0], int64(len(b)));
+ var r, e int64;
+ if len(b) > 0 { // because we access b[0]
+ r, e = syscall.write(fd.fd, &b[0], int64(len(b)));
+ }
return int(r), ErrnoToError(e)
}
