[Qemu-devel] [5188] Add missing files from previous commit.

[Anthony Liguori]

Revision: 5188
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5188
Author:   aliguori
Date:     2008-09-10 18:18:38 +0000 (Wed, 10 Sep 2008)

Log Message:
-----------
Add missing files from previous commit.

Added Paths:
-----------
    trunk/compatfd.c
    trunk/compatfd.h

Added: trunk/compatfd.c
===================================================================
--- trunk/compatfd.c                            (rev 0)
+++ trunk/compatfd.c    2008-09-10 18:18:38 UTC (rev 5188)
@@ -0,0 +1,128 @@
+/*
+ * signalfd/eventfd compatibility
+ *
+ * Copyright IBM, Corp. 2008
+ *
+ * Authors:
+ *  Anthony Liguori   <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "compatfd.h"
+
+#include <sys/syscall.h>
+#include <pthread.h>
+
+struct sigfd_compat_info
+{
+    sigset_t mask;
+    int fd;
+};
+
+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];
+           size_t offset = 0;
+
+           memcpy(buffer, &err, sizeof(err));
+           while (offset < sizeof(buffer)) {
+               ssize_t len;
+
+               len = write(info->fd, buffer + offset,
+                           sizeof(buffer) - offset);
+               if (len == -1 && errno == EINTR)
+                   continue;
+
+               if (len <= 0) {
+                   err = -1;
+                   break;
+               }
+
+               offset += len;
+           }
+       }
+    } while (err >= 0);
+
+    return NULL;
+}
+
+static int qemu_signalfd_compat(const sigset_t *mask)
+{
+    pthread_attr_t attr;
+    pthread_t tid;
+    struct sigfd_compat_info *info;
+    int fds[2];
+
+    info = malloc(sizeof(*info));
+    if (info == NULL) {
+       errno = ENOMEM;
+       return -1;
+    }
+
+    if (pipe(fds) == -1) {
+       free(info);
+       return -1;
+    }
+
+    memcpy(&info->mask, mask, sizeof(*mask));
+    info->fd = fds[1];
+
+    pthread_attr_init(&attr);
+    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+
+    pthread_create(&tid, &attr, sigwait_compat, info);
+
+    pthread_attr_destroy(&attr);
+
+    return fds[0];
+}
+
+int qemu_signalfd(const sigset_t *mask)
+{
+#if defined(SYS_signalfd)
+    int ret;
+
+    ret = syscall(SYS_signalfd, -1, mask, _NSIG / 8);
+    if (!(ret == -1 && errno == ENOSYS))
+       return ret;
+#endif
+
+    return qemu_signalfd_compat(mask);
+}
+
+int qemu_eventfd(int *fds)
+{
+#if defined(SYS_eventfd)
+    int ret;
+
+    ret = syscall(SYS_eventfd, 0);
+    if (ret >= 0) {
+       fds[0] = fds[1] = ret;
+       return 0;
+    } else if (!(ret == -1 && errno == ENOSYS))
+       return ret;
+#endif
+
+    return pipe(fds);
+}

Added: trunk/compatfd.h
===================================================================
--- trunk/compatfd.h                            (rev 0)
+++ trunk/compatfd.h    2008-09-10 18:18:38 UTC (rev 5188)
@@ -0,0 +1,32 @@
+/*
+ * signalfd/eventfd compatibility
+ *
+ * Copyright IBM, Corp. 2008
+ *
+ * Authors:
+ *  Anthony Liguori   <address@hidden>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef QEMU_COMPATFD_H
+#define QEMU_COMPATFD_H
+
+#include <signal.h>
+
+#if defined(__linux__) && !defined(SYS_signalfd)
+struct signalfd_siginfo {
+    uint32_t ssi_signo;
+    uint8_t pad[124];
+};
+#else
+#include <linux/signalfd.h>
+#endif
+
+int qemu_signalfd(const sigset_t *mask);
+
+int qemu_eventfd(int *fds);
+
+#endif