spapr_iommu: Give unique QOM name to TCE table
[qemu/rayw.git] / util / compatfd.c
blobe8571502beffc7c841809d7a173965e0123ffd7f
1 /*
2 * signalfd/eventfd compatibility
4 * Copyright IBM, Corp. 2008
6 * Authors:
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-common.h"
17 #include "qemu/compatfd.h"
18 #include "qemu/thread.h"
20 #include <sys/syscall.h>
22 struct sigfd_compat_info
24 sigset_t mask;
25 int fd;
28 static void *sigwait_compat(void *opaque)
30 struct sigfd_compat_info *info = opaque;
32 while (1) {
33 int sig;
34 int err;
36 err = sigwait(&info->mask, &sig);
37 if (err != 0) {
38 if (errno == EINTR) {
39 continue;
40 } else {
41 return NULL;
43 } else {
44 struct qemu_signalfd_siginfo buffer;
45 size_t offset = 0;
47 memset(&buffer, 0, sizeof(buffer));
48 buffer.ssi_signo = sig;
50 while (offset < sizeof(buffer)) {
51 ssize_t len;
53 len = write(info->fd, (char *)&buffer + offset,
54 sizeof(buffer) - offset);
55 if (len == -1 && errno == EINTR)
56 continue;
58 if (len <= 0) {
59 return NULL;
62 offset += len;
68 static int qemu_signalfd_compat(const sigset_t *mask)
70 struct sigfd_compat_info *info;
71 QemuThread thread;
72 int fds[2];
74 info = malloc(sizeof(*info));
75 if (info == NULL) {
76 errno = ENOMEM;
77 return -1;
80 if (pipe(fds) == -1) {
81 free(info);
82 return -1;
85 qemu_set_cloexec(fds[0]);
86 qemu_set_cloexec(fds[1]);
88 memcpy(&info->mask, mask, sizeof(*mask));
89 info->fd = fds[1];
91 qemu_thread_create(&thread, "signalfd_compat", sigwait_compat, info,
92 QEMU_THREAD_DETACHED);
94 return fds[0];
97 int qemu_signalfd(const sigset_t *mask)
99 #if defined(CONFIG_SIGNALFD)
100 int ret;
102 ret = syscall(SYS_signalfd, -1, mask, _NSIG / 8);
103 if (ret != -1) {
104 qemu_set_cloexec(ret);
105 return ret;
107 #endif
109 return qemu_signalfd_compat(mask);