Fix missing POLLRDHUP constant on older systems.

Attempting to compile with g++ 4.1.2 failed because the POLLRDHUP
constant was not defined when <poll.h> is included.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/subprocess.cc b/src/subprocess.cc
index 0d240b1..fee842f 100644
--- a/src/subprocess.cc
+++ b/src/subprocess.cc
@@ -25,6 +25,13 @@
 #include <string.h>
 #include <sys/wait.h>
 
+// Older versions of won't find this in <poll.h>.  Some versions keep it in
+// <asm-generic/poll.h>, though attempting to include that will redefine the
+// pollfd structure.
+#ifndef POLLRDHUP
+#define POLLRDHUP 0x2000
+#endif
+
 #include "util.h"
 
 Subprocess::Subprocess() : fd_(-1), pid_(-1) {