Revision: 1362
http://geeqie.svn.sourceforge.net/geeqie/?rev=1362&view=rev
Author: nadvornik
Date: 2009-01-29 18:05:41 +0000 (Thu, 29 Jan 2009)
Log Message:
-----------
added SIGBUS handler
Modified Paths:
--------------
trunk/src/main.c
Modified: trunk/src/main.c
===================================================================
--- trunk/src/main.c 2009-01-26 21:08:05 UTC (rev 1361)
+++ trunk/src/main.c 2009-01-29 18:05:41 UTC (rev 1362)
@@ -34,6 +34,8 @@
#include <gdk/gdkkeysyms.h> /* for keyboard values */
+#include <signal.h>
+#include <sys/mman.h>
#include <math.h>
#ifdef G_OS_UNIX
@@ -661,6 +663,39 @@
exit_program_final();
}
+
+
+/* This code is supposed to handle situation when a file mmaped by
image_loader
+ * or by exif loader is truncated by some other process.
+ * This is probably not completely correct according to posix, because
+ * mmap is not in the list of calls that can be used safely in signal handler,
+ * but anyway, the handler is called in situation when the application would
+ * crash otherwise.
+ * Ideas for improvement are welcome ;)
+ */
+/* FIXME: this probably needs some better ifdefs. Please report any
compilation problems */
+
+#ifdef SIGBUS
+static void sigbus_handler_cb(int signum, siginfo_t *info, void *context)
+{
+ unsigned long pagesize = sysconf(_SC_PAGE_SIZE);
+ DEBUG_1("SIGBUS %p", info->si_addr);
+ mmap((void *)(((unsigned long)info->si_addr / pagesize) * pagesize),
pagesize, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1,
0);
+}
+#endif
+
+static void setup_sigbus_handler(void)
+{
+#ifdef SIGBUS
+ struct sigaction sigbus_action;
+ sigfillset(&sigbus_action.sa_mask);
+ sigbus_action.sa_sigaction = sigbus_handler_cb;
+ sigbus_action.sa_flags = SA_SIGINFO;
+
+ sigaction(SIGBUS, &sigbus_action, NULL);
+#endif
+}
+
gint main(gint argc, gchar *argv[])
{
LayoutWindow *lw;
@@ -699,6 +734,8 @@
log_printf("%s %s, This is an alpha release.\n", GQ_APPNAME, VERSION);
#endif
+ setup_sigbus_handler();
+
/* register global notify functions */
file_data_register_notify_func(cache_notify_cb, NULL,
NOTIFY_PRIORITY_HIGH);
file_data_register_notify_func(thumb_notify_cb, NULL,
NOTIFY_PRIORITY_HIGH);
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