mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
6b620ca3b0
All files under GPLv2 will get GPLv2+ changes starting tomorrow. event_notifier.c and exec-obsolete.h were only ever touched by Red Hat employees and can be relicensed now. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
138 lines
2.8 KiB
C
138 lines
2.8 KiB
C
/*
|
|
* signalfd/eventfd compatibility
|
|
*
|
|
* Copyright IBM, Corp. 2008
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
* Contributions after 2012-01-13 are licensed under the terms of the
|
|
* GNU GPL, version 2 or (at your option) any later version.
|
|
*/
|
|
|
|
#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;
|
|
sigset_t all;
|
|
|
|
sigfillset(&all);
|
|
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;
|
|
|
|
memset(&buffer, 0, sizeof(buffer));
|
|
buffer.ssi_signo = sig;
|
|
|
|
while (offset < sizeof(buffer)) {
|
|
ssize_t len;
|
|
|
|
len = write(info->fd, (char *)&buffer + offset,
|
|
sizeof(buffer) - offset);
|
|
if (len == -1 && errno == EINTR)
|
|
continue;
|
|
|
|
if (len <= 0) {
|
|
return NULL;
|
|
}
|
|
|
|
offset += len;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
qemu_set_cloexec(fds[0]);
|
|
qemu_set_cloexec(fds[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(CONFIG_SIGNALFD)
|
|
int ret;
|
|
|
|
ret = syscall(SYS_signalfd, -1, mask, _NSIG / 8);
|
|
if (ret != -1) {
|
|
qemu_set_cloexec(ret);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
return qemu_signalfd_compat(mask);
|
|
}
|
|
|
|
bool qemu_signalfd_available(void)
|
|
{
|
|
#ifdef CONFIG_SIGNALFD
|
|
sigset_t mask;
|
|
int fd;
|
|
bool ok;
|
|
sigemptyset(&mask);
|
|
errno = 0;
|
|
fd = syscall(SYS_signalfd, -1, &mask, _NSIG / 8);
|
|
ok = (errno != ENOSYS);
|
|
if (fd >= 0) {
|
|
close(fd);
|
|
}
|
|
return ok;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|