Fix linker scripts

[qemu.git] / compatfd.c

diff --git a/compatfd.c b/compatfd.c
index a7cebc486747151081c39ac7e144c137a7a70992..31654c62a690aff68d7350bbe96ed80391e36b7a 100644 (file)
--- a/compatfd.c
+++ b/compatfd.c
@@ -26,45 +26,45 @@ struct sigfd_compat_info
 static void *sigwait_compat(void *opaque)
 {
     struct sigfd_compat_info *info = opaque;
-    int err;
     sigset_t all;
 
     sigfillset(&all);
-    sigprocmask(SIG_BLOCK, &all, NULL);
-
-    do {
-        siginfo_t siginfo;
-
-        err = sigwaitinfo(&info->mask, &siginfo);
-        if (err == -1 && errno == EINTR) {
-            err = 0;
-            continue;
-        }
-
-        if (err > 0) {
-            char buffer[128];
+    pthread_sigmask(SIG_BLOCK, &all, NULL);
+
+    while (1) {
+        int sig;
+        int err;
+
+        err = sigwait(&info->mask, &sig);
+        if (err != 0) {
+            if (errno == EINTR) {
+                continue;
+            } else {
+                return NULL;
+            }
+        } else {
+            struct qemu_signalfd_siginfo buffer;
             size_t offset = 0;
 
-            memcpy(buffer, &err, sizeof(err));
+            memset(&buffer, 0, sizeof(buffer));
+            buffer.ssi_signo = sig;
+
             while (offset < sizeof(buffer)) {
                 ssize_t len;
 
-                len = write(info->fd, buffer + offset,
+                len = write(info->fd, (char *)&buffer + offset,
                             sizeof(buffer) - offset);
                 if (len == -1 && errno == EINTR)
                     continue;
 
                 if (len <= 0) {
-                    err = -1;
-                    break;
+                    return NULL;
                 }
 
                 offset += len;
             }
         }
-    } while (err >= 0);
-
-    return NULL;
+    }
 }
 
 static int qemu_signalfd_compat(const sigset_t *mask)
@@ -115,3 +115,14 @@ int qemu_signalfd(const sigset_t *mask)
 
     return qemu_signalfd_compat(mask);
 }
+
+bool qemu_signalfd_available(void)
+{
+#ifdef CONFIG_SIGNALFD
+    errno = 0;
+    syscall(SYS_signalfd, -1, NULL, _NSIG / 8);
+    return errno != ENOSYS;
+#else
+    return false;
+#endif
+}