#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)
#include <pulsecore/aupdate.h>
#include <pulsecore/atomic.h>
#include <pulsecore/once.h>
+#include <pulsecore/mutex.h>
#include "memtrap.h"
static pa_memtrap *memtraps[2] = { NULL, NULL };
static pa_aupdate *aupdate;
+static pa_static_mutex mutex = PA_STATIC_MUTEX_INIT; /* only required to serialize access to the write side */
static void allocate_aupdate(void) {
PA_ONCE_BEGIN {
return !pa_atomic_load(&m->bad);
}
+#ifdef HAVE_SIGACTION
static void sigsafe_error(const char *s) {
- write(STDERR_FILENO, s, strlen(s));
+ size_t ret PA_GCC_UNUSED;
+ ret = write(STDERR_FILENO, s, strlen(s));
}
static void signal_handler(int sig, siginfo_t* si, void *data) {
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;
}
pa_memtrap* pa_memtrap_add(const void *start, size_t size) {
pa_memtrap *m = NULL;
unsigned j;
+ pa_mutex *mx;
pa_assert(start);
pa_assert(size > 0);
allocate_aupdate();
+ mx = pa_static_mutex_get(&mutex, FALSE, TRUE);
+ pa_mutex_lock(mx);
+
j = pa_aupdate_write_begin(aupdate);
memtrap_link(m, j);
j = pa_aupdate_write_swap(aupdate);
memtrap_link(m, j);
pa_aupdate_write_end(aupdate);
+ pa_mutex_unlock(mx);
+
return m;
}
void pa_memtrap_remove(pa_memtrap *m) {
unsigned j;
+ pa_mutex *mx;
pa_assert(m);
allocate_aupdate();
+ mx = pa_static_mutex_get(&mutex, FALSE, TRUE);
+ pa_mutex_lock(mx);
+
j = pa_aupdate_write_begin(aupdate);
memtrap_unlink(m, j);
j = pa_aupdate_write_swap(aupdate);
memtrap_unlink(m, j);
pa_aupdate_write_end(aupdate);
+ pa_mutex_unlock(mx);
+
pa_xfree(m);
}
pa_memtrap *pa_memtrap_update(pa_memtrap *m, const void *start, size_t size) {
unsigned j;
+ pa_mutex *mx;
pa_assert(m);
allocate_aupdate();
+ mx = pa_static_mutex_get(&mutex, FALSE, TRUE);
+ pa_mutex_lock(mx);
+
j = pa_aupdate_write_begin(aupdate);
if (m->start == start && m->size == size)
goto unlock;
memtrap_unlink(m, j);
- j = pa_aupdate_write_swap(aupdate);
+ pa_aupdate_write_swap(aupdate);
m->start = (void*) start;
m->size = size;
pa_atomic_store(&m->bad, 0);
- j = pa_aupdate_write_swap(aupdate);
+ pa_assert_se(pa_aupdate_write_swap(aupdate) == j);
memtrap_link(m, j);
unlock:
pa_aupdate_write_end(aupdate);
+ pa_mutex_unlock(mx);
+
return m;
}
void pa_memtrap_install(void) {
+#ifdef HAVE_SIGACTION
struct sigaction sa;
allocate_aupdate();
sa.sa_flags = SA_RESTART|SA_SIGINFO;
pa_assert_se(sigaction(SIGBUS, &sa, NULL) == 0);
+#endif
}