From: Eric Wong <normalperson@...>
Date: 2016-05-02T21:24:34+00:00
Subject: [ruby-core:75316] Re: [ruby-cvs:62052] normal:r54890 (trunk): process.c (disable_child_handler_fork_child): initialize handler for SIGPIPE

normal@ruby-lang.org wrote:
>   https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=54890

Honestly, I don't understand why we use sigaction in here at all
since all we set is SIG_DFL.  signal(2) is portably defined
for SIG_DFL and SIG_IGN.  So maybe the following is a welcome
simplification to reduce confusing #ifdefs.

diff --git a/process.c b/process.c
index 6f3fc23..09ddcd0 100644
--- a/process.c
+++ b/process.c
@@ -3485,43 +3485,17 @@ disable_child_handler_fork_child(struct child_handler_disabler_state *old, char
 {
     int sig;
     int ret;
-#ifdef POSIX_SIGNAL
-    struct sigaction act, oact;
-
-    act.sa_handler = SIG_DFL;
-    act.sa_flags = 0;
-    ret = sigemptyset(&act.sa_mask); /* async-signal-safe */
-    if (ret == -1) {
-        ERRMSG("sigemptyset");
-        return -1;
-    }
-#else
     sig_t handler;
-#endif
 
     for (sig = 1; sig < NSIG; sig++) {
         int reset = 0;
 #ifdef SIGPIPE
         if (sig == SIGPIPE) {
             reset = 1;
-#ifndef POSIX_SIGNAL
             handler = SIG_DFL;
-#endif
 	}
 #endif
         if (!reset) {
-#ifdef POSIX_SIGNAL
-            ret = sigaction(sig, NULL, &oact); /* async-signal-safe */
-            if (ret == -1 && errno == EINVAL) {
-                continue; /* Ignore invalid signal number. */
-            }
-            if (ret == -1) {
-                ERRMSG("sigaction to obtain old action");
-                return -1;
-            }
-            reset = (oact.sa_flags & SA_SIGINFO) ||
-                    (oact.sa_handler != SIG_IGN && oact.sa_handler != SIG_DFL);
-#else
             handler = signal(sig, SIG_DFL);
             if (handler == SIG_ERR && errno == EINVAL) {
                 continue; /* Ignore invalid signal number */
@@ -3531,22 +3505,13 @@ disable_child_handler_fork_child(struct child_handler_disabler_state *old, char
                 return -1;
             }
             reset = (handler != SIG_IGN && handler != SIG_DFL);
-#endif
         }
         if (reset) {
-#ifdef POSIX_SIGNAL
-            ret = sigaction(sig, &act, NULL); /* async-signal-safe */
-            if (ret == -1) {
-                ERRMSG("sigaction to set default action");
-                return -1;
-            }
-#else
            handler = signal(sig, handler);
            if (handler == SIG_ERR) {
                 ERRMSG("signal to set default action");
                 return -1;
            }
-#endif
         }
     }
 

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