2 * signalfd/eventfd compatibility
4 * Copyright IBM, Corp. 2008
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
12 * Contributions after 2012-01-13 are licensed under the terms of the
13 * GNU GPL, version 2 or (at your option) any later version.
16 #include "qemu/osdep.h"
17 #include "qemu/thread.h"
19 #if defined(CONFIG_SIGNALFD)
20 #include <sys/syscall.h>
23 struct sigfd_compat_info {
28 static void *sigwait_compat(void *opaque)
30 struct sigfd_compat_info *info = opaque;
36 err = sigwait(&info->mask, &sig);
44 struct qemu_signalfd_siginfo buffer;
47 memset(&buffer, 0, sizeof(buffer));
48 buffer.ssi_signo = sig;
50 while (offset < sizeof(buffer)) {
53 len = write(info->fd, (char *)&buffer + offset,
54 sizeof(buffer) - offset);
55 if (len == -1 && errno == EINTR) {
69 static int qemu_signalfd_compat(const sigset_t *mask)
71 struct sigfd_compat_info *info;
75 info = malloc(sizeof(*info));
81 if (pipe(fds) == -1) {
86 qemu_set_cloexec(fds[0]);
87 qemu_set_cloexec(fds[1]);
89 memcpy(&info->mask, mask, sizeof(*mask));
92 qemu_thread_create(&thread, "signalfd_compat", sigwait_compat, info,
93 QEMU_THREAD_DETACHED);
98 int qemu_signalfd(const sigset_t *mask)
100 #if defined(CONFIG_SIGNALFD)
103 ret = syscall(SYS_signalfd, -1, mask, _NSIG / 8);
105 qemu_set_cloexec(ret);
110 return qemu_signalfd_compat(mask);