mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
a8d2532645
No header includes qemu-common.h after this commit, as prescribed by qemu-common.h's file comment. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190523143508.25387-5-armbru@redhat.com> [Rebased with conflicts resolved automatically, except for include/hw/arm/xlnx-zynqmp.h hw/arm/nrf51_soc.c hw/arm/msf2-soc.c block/qcow2-refcount.c block/qcow2-cluster.c block/qcow2-cache.c target/arm/cpu.h target/lm32/cpu.h target/m68k/cpu.h target/mips/cpu.h target/moxie/cpu.h target/nios2/cpu.h target/openrisc/cpu.h target/riscv/cpu.h target/tilegx/cpu.h target/tricore/cpu.h target/unicore32/cpu.h target/xtensa/cpu.h; bsd-user/main.c and net/tap-bsd.c fixed up]
109 lines
2.3 KiB
C
109 lines
2.3 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/osdep.h"
|
|
#include "qemu/thread.h"
|
|
|
|
#include <sys/syscall.h>
|
|
|
|
struct sigfd_compat_info
|
|
{
|
|
sigset_t mask;
|
|
int fd;
|
|
};
|
|
|
|
static void *sigwait_compat(void *opaque)
|
|
{
|
|
struct sigfd_compat_info *info = opaque;
|
|
|
|
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)
|
|
{
|
|
struct sigfd_compat_info *info;
|
|
QemuThread thread;
|
|
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];
|
|
|
|
qemu_thread_create(&thread, "signalfd_compat", sigwait_compat, info,
|
|
QEMU_THREAD_DETACHED);
|
|
|
|
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);
|
|
}
|