Implement the "volume sharing" feature.

[pulseaudio] / src / pulsecore / memtrap.c

diff --git a/src/pulsecore/memtrap.c b/src/pulsecore/memtrap.c
index 373872c1c5bd4e7bcabbb3c00cf6cef8eb1bcbbc..b56d806adaaab3b7dbcf099b28c80fa8b8ad41a6 100644 (file)
--- a/src/pulsecore/memtrap.c
+++ b/src/pulsecore/memtrap.c
@@ -24,7 +24,10 @@
 #endif
 
 #include <signal.h>
+
+#ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
+#endif
 
 /* This is deprecated on glibc but is still used by FreeBSD */
 #if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
@@ -68,6 +71,7 @@ static void sigsafe_error(const char *s) {
     (void) write(STDERR_FILENO, s, strlen(s));
 }
 
+#ifdef HAVE_SIGACTION
 static void signal_handler(int sig, siginfo_t* si, void *data) {
     unsigned j;
     pa_memtrap *m;
@@ -102,12 +106,16 @@ fail:
     sigsafe_error("Failed to handle SIGBUS.\n");
     abort();
 }
+#endif
 
 static void memtrap_link(pa_memtrap *m, unsigned j) {
     pa_assert(m);
 
     m->prev[j] = NULL;
-    m->next[j] = memtraps[j];
+
+    if ((m->next[j] = memtraps[j]))
+        m->next[j]->prev[j] = m;
+
     memtraps[j] = m;
 }
 
@@ -218,6 +226,7 @@ unlock:
 }
 
 void pa_memtrap_install(void) {
+#ifdef HAVE_SIGACTION
     struct sigaction sa;
 
     allocate_aupdate();
@@ -227,4 +236,5 @@ void pa_memtrap_install(void) {
     sa.sa_flags = SA_RESTART|SA_SIGINFO;
 
     pa_assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
+#endif
 }