aboutsummaryrefslogtreecommitdiff
path: root/migration/qemu-file-unix.c
diff options
context:
space:
mode:
Diffstat (limited to 'migration/qemu-file-unix.c')
-rw-r--r--migration/qemu-file-unix.c323
1 files changed, 0 insertions, 323 deletions
diff --git a/migration/qemu-file-unix.c b/migration/qemu-file-unix.c
deleted file mode 100644
index 4474e18ff8..0000000000
--- a/migration/qemu-file-unix.c
+++ /dev/null
@@ -1,323 +0,0 @@
-/*
- * QEMU System Emulator
- *
- * Copyright (c) 2003-2008 Fabrice Bellard
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-#include "qemu/osdep.h"
-#include "qemu-common.h"
-#include "qemu/error-report.h"
-#include "qemu/iov.h"
-#include "qemu/sockets.h"
-#include "qemu/coroutine.h"
-#include "migration/qemu-file.h"
-#include "migration/qemu-file-internal.h"
-
-typedef struct QEMUFileSocket {
- int fd;
- QEMUFile *file;
-} QEMUFileSocket;
-
-static ssize_t socket_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
- int64_t pos)
-{
- QEMUFileSocket *s = opaque;
- ssize_t len;
- ssize_t size = iov_size(iov, iovcnt);
- ssize_t offset = 0;
- int err;
-
- while (size > 0) {
- len = iov_send(s->fd, iov, iovcnt, offset, size);
-
- if (len > 0) {
- size -= len;
- offset += len;
- }
-
- if (size > 0) {
- if (errno != EAGAIN && errno != EWOULDBLOCK) {
- error_report("socket_writev_buffer: Got err=%d for (%zu/%zu)",
- errno, (size_t)size, (size_t)len);
- /*
- * If I've already sent some but only just got the error, I
- * could return the amount validly sent so far and wait for the
- * next call to report the error, but I'd rather flag the error
- * immediately.
- */
- return -errno;
- }
-
- /* Emulate blocking */
- GPollFD pfd;
-
- pfd.fd = s->fd;
- pfd.events = G_IO_OUT | G_IO_ERR;
- pfd.revents = 0;
- TFR(err = g_poll(&pfd, 1, -1 /* no timeout */));
- /* Errors other than EINTR intentionally ignored */
- }
- }
-
- return offset;
-}
-
-static int socket_get_fd(void *opaque)
-{
- QEMUFileSocket *s = opaque;
-
- return s->fd;
-}
-
-static ssize_t socket_get_buffer(void *opaque, uint8_t *buf, int64_t pos,
- size_t size)
-{
- QEMUFileSocket *s = opaque;
- ssize_t len;
-
- for (;;) {
- len = qemu_recv(s->fd, buf, size, 0);
- if (len != -1) {
- break;
- }
- if (errno == EAGAIN) {
- yield_until_fd_readable(s->fd);
- } else if (errno != EINTR) {
- break;
- }
- }
-
- if (len == -1) {
- len = -errno;
- }
- return len;
-}
-
-static int socket_close(void *opaque)
-{
- QEMUFileSocket *s = opaque;
- closesocket(s->fd);
- g_free(s);
- return 0;
-}
-
-static int socket_shutdown(void *opaque, bool rd, bool wr)
-{
- QEMUFileSocket *s = opaque;
-
- if (shutdown(s->fd, rd ? (wr ? SHUT_RDWR : SHUT_RD) : SHUT_WR)) {
- return -errno;
- } else {
- return 0;
- }
-}
-
-static int socket_return_close(void *opaque)
-{
- QEMUFileSocket *s = opaque;
- /*
- * Note: We don't close the socket, that should be done by the forward
- * path.
- */
- g_free(s);
- return 0;
-}
-
-static const QEMUFileOps socket_return_read_ops = {
- .get_fd = socket_get_fd,
- .get_buffer = socket_get_buffer,
- .close = socket_return_close,
- .shut_down = socket_shutdown,
-};
-
-static const QEMUFileOps socket_return_write_ops = {
- .get_fd = socket_get_fd,
- .writev_buffer = socket_writev_buffer,
- .close = socket_return_close,
- .shut_down = socket_shutdown,
-};
-
-/*
- * Give a QEMUFile* off the same socket but data in the opposite
- * direction.
- */
-static QEMUFile *socket_get_return_path(void *opaque)
-{
- QEMUFileSocket *forward = opaque;
- QEMUFileSocket *reverse;
-
- if (qemu_file_get_error(forward->file)) {
- /* If the forward file is in error, don't try and open a return */
- return NULL;
- }
-
- reverse = g_malloc0(sizeof(QEMUFileSocket));
- reverse->fd = forward->fd;
- /* I don't think there's a better way to tell which direction 'this' is */
- if (forward->file->ops->get_buffer != NULL) {
- /* being called from the read side, so we need to be able to write */
- return qemu_fopen_ops(reverse, &socket_return_write_ops);
- } else {
- return qemu_fopen_ops(reverse, &socket_return_read_ops);
- }
-}
-
-static ssize_t unix_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
- int64_t pos)
-{
- QEMUFileSocket *s = opaque;
- ssize_t len, offset;
- ssize_t size = iov_size(iov, iovcnt);
- ssize_t total = 0;
-
- assert(iovcnt > 0);
- offset = 0;
- while (size > 0) {
- /* Find the next start position; skip all full-sized vector elements */
- while (offset >= iov[0].iov_len) {
- offset -= iov[0].iov_len;
- iov++, iovcnt--;
- }
-
- /* skip `offset' bytes from the (now) first element, undo it on exit */
- assert(iovcnt > 0);
- iov[0].iov_base += offset;
- iov[0].iov_len -= offset;
-
- do {
- len = writev(s->fd, iov, iovcnt);
- } while (len == -1 && errno == EINTR);
- if (len == -1) {
- return -errno;
- }
-
- /* Undo the changes above */
- iov[0].iov_base -= offset;
- iov[0].iov_len += offset;
-
- /* Prepare for the next iteration */
- offset += len;
- total += len;
- size -= len;
- }
-
- return total;
-}
-
-static ssize_t unix_get_buffer(void *opaque, uint8_t *buf, int64_t pos,
- size_t size)
-{
- QEMUFileSocket *s = opaque;
- ssize_t len;
-
- for (;;) {
- len = read(s->fd, buf, size);
- if (len != -1) {
- break;
- }
- if (errno == EAGAIN) {
- yield_until_fd_readable(s->fd);
- } else if (errno != EINTR) {
- break;
- }
- }
-
- if (len == -1) {
- len = -errno;
- }
- return len;
-}
-
-static int unix_close(void *opaque)
-{
- QEMUFileSocket *s = opaque;
- close(s->fd);
- g_free(s);
- return 0;
-}
-
-static const QEMUFileOps unix_read_ops = {
- .get_fd = socket_get_fd,
- .get_buffer = unix_get_buffer,
- .close = unix_close
-};
-
-static const QEMUFileOps unix_write_ops = {
- .get_fd = socket_get_fd,
- .writev_buffer = unix_writev_buffer,
- .close = unix_close
-};
-
-QEMUFile *qemu_fdopen(int fd, const char *mode)
-{
- QEMUFileSocket *s;
-
- if (mode == NULL ||
- (mode[0] != 'r' && mode[0] != 'w') ||
- mode[1] != 'b' || mode[2] != 0) {
- fprintf(stderr, "qemu_fdopen: Argument validity check failed\n");
- return NULL;
- }
-
- s = g_new0(QEMUFileSocket, 1);
- s->fd = fd;
-
- if (mode[0] == 'r') {
- s->file = qemu_fopen_ops(s, &unix_read_ops);
- } else {
- s->file = qemu_fopen_ops(s, &unix_write_ops);
- }
- return s->file;
-}
-
-static const QEMUFileOps socket_read_ops = {
- .get_fd = socket_get_fd,
- .get_buffer = socket_get_buffer,
- .close = socket_close,
- .shut_down = socket_shutdown,
- .get_return_path = socket_get_return_path
-};
-
-static const QEMUFileOps socket_write_ops = {
- .get_fd = socket_get_fd,
- .writev_buffer = socket_writev_buffer,
- .close = socket_close,
- .shut_down = socket_shutdown,
- .get_return_path = socket_get_return_path
-};
-
-QEMUFile *qemu_fopen_socket(int fd, const char *mode)
-{
- QEMUFileSocket *s;
-
- if (qemu_file_mode_is_not_valid(mode)) {
- return NULL;
- }
-
- s = g_new0(QEMUFileSocket, 1);
- s->fd = fd;
- if (mode[0] == 'w') {
- qemu_set_block(s->fd);
- s->file = qemu_fopen_ops(s, &socket_write_ops);
- } else {
- s->file = qemu_fopen_ops(s, &socket_read_ops);
- }
- return s->file;
-}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-24 20:01:08 +0000