Add a comment.

[pspp] / lib / fatal-signal.c

diff --git a/lib/fatal-signal.c b/lib/fatal-signal.c
index a599f3a5c811c8026e938211bf0327d84cd944ac..7654d1f4f2286ec993316bd93b5313630e32e865 100644 (file)
--- a/lib/fatal-signal.c
+++ b/lib/fatal-signal.c
@@ -96,6 +96,10 @@ init_fatal_signals (void)
          struct sigaction action;
 
          if (sigaction (fatal_signals[i], NULL, &action) >= 0
+             /* POSIX says that SIG_IGN can only occur when action.sa_flags
+                does not contain SA_SIGINFO.  But in Linux 2.4, for example,
+                SA_SIGINFO can actually be set and is ignored when sa_handler
+                is SIG_IGN.  So don't bother testing for SA_SIGINFO.  */
              && action.sa_handler == SIG_IGN)
            fatal_signals[i] = -1;
        }