1 files changed, 18 insertions, 0 deletions

diff --git a/fs/signalfd.c b/fs/signalfd.c
index 8bee4e570911..b53486961735 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -29,6 +29,7 @@
 #include <linux/anon_inodes.h>
 #include <linux/signalfd.h>
 #include <linux/syscalls.h>
+#include <linux/proc_fs.h>
 
 void signalfd_cleanup(struct sighand_struct *sighand)
 {
@@ -227,7 +228,24 @@ static ssize_t signalfd_read(struct file *file, char __user *buf, size_t count,
         return total ? total: ret;
 }
 
+#ifdef CONFIG_PROC_FS
+static int signalfd_show_fdinfo(struct seq_file *m, struct file *f)
+{
+        struct signalfd_ctx *ctx = f->private_data;
+        sigset_t sigmask;
+
+        sigmask = ctx->sigmask;
+        signotset(&sigmask);
+        render_sigset_t(m, "sigmask:\t", &sigmask);
+
+        return 0;
+}
+#endif
+
 static const struct file_operations signalfd_fops = {
+#ifdef CONFIG_PROC_FS
+        .show_fdinfo    = signalfd_show_fdinfo,
+#endif
         .release        = signalfd_release,
         .poll           = signalfd_poll,
         .read           = signalfd_read,