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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] libvchan: interdomain communications library
Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
This version includes a local copy of gntalloc.h and gntdev.h to allow
it to compile when the installed kernel headers do not include gntalloc
and to support GNTDEV_SET_UNMAP_NOTIFY when the running kernel does not
match the headers.
---
tools/Makefile | 1 +
tools/libvchan/Makefile | 57 ++++++
tools/libvchan/gntalloc.h | 82 ++++++++
tools/libvchan/gntdev.h | 150 ++++++++++++++
tools/libvchan/init.c | 456 ++++++++++++++++++++++++++++++++++++++++++
tools/libvchan/io.c | 270 +++++++++++++++++++++++++
tools/libvchan/libvchan.h | 141 +++++++++++++
tools/libvchan/node-select.c | 161 +++++++++++++++
tools/libvchan/node.c | 169 ++++++++++++++++
9 files changed, 1487 insertions(+), 0 deletions(-)
create mode 100644 tools/libvchan/Makefile
create mode 100644 tools/libvchan/gntalloc.h
create mode 100644 tools/libvchan/gntdev.h
create mode 100644 tools/libvchan/init.c
create mode 100644 tools/libvchan/io.c
create mode 100644 tools/libvchan/libvchan.h
create mode 100644 tools/libvchan/node-select.c
create mode 100644 tools/libvchan/node.c
diff --git a/tools/Makefile b/tools/Makefile
index df6270c..9389e1f 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -27,6 +27,7 @@ SUBDIRS-$(CONFIG_NetBSD) += blktap2
SUBDIRS-$(CONFIG_NetBSD) += xenbackendd
SUBDIRS-y += libfsimage
SUBDIRS-$(LIBXENAPI_BINDINGS) += libxen
+SUBDIRS-y += libvchan
# do not recurse in to a dir we are about to delete
ifneq "$(MAKECMDGOALS)" "distclean"
diff --git a/tools/libvchan/Makefile b/tools/libvchan/Makefile
new file mode 100644
index 0000000..9195f6e
--- /dev/null
+++ b/tools/libvchan/Makefile
@@ -0,0 +1,57 @@
+#
+# tools/libvchan/Makefile
+#
+
+XEN_ROOT = $(CURDIR)/../..
+include $(XEN_ROOT)/tools/Rules.mk
+
+LIBVCHAN_OBJS = init.o io.o
+NODE_OBJS = node.o
+NODE2_OBJS = node-select.o
+
+LIBVCHAN_LIBS = $(LDLIBS_libxenstore)
+LIBVCHAN_OBJS: CFLAGS += $(CFLAGS_libxenstore)
+
+MAJOR = 1.0
+MINOR = 0
+
+CFLAGS += -I. -fPIC
+
+.PHONY: all
+all: libvchan.so vchan-node1 vchan-node2 libvchan.a
+
+libvchan.so: libvchan.so.$(MAJOR)
+ ln -sf $< $@
+
+libvchan.so.$(MAJOR): libvchan.so.$(MAJOR).$(MINOR)
+ ln -sf $< $@
+
+libvchan.so.$(MAJOR).$(MINOR): $(LIBVCHAN_OBJS)
+ $(CC) $(LDFLAGS) -Wl,$(SONAME_LDFLAG) -Wl,libvchan.so.$(MAJOR)
$(SHLIB_LDFLAGS) -o $@ $^ $(LIBVCHAN_LIBS)
+
+libvchan.a: $(LIBVCHAN_OBJS)
+ $(AR) rcs libvchan.a $^
+
+vchan-node1: $(NODE_OBJS) libvchan.so
+ $(CC) $(LDFLAGS) -o $@ $(NODE_OBJS) libvchan.so $(LDLIBS_libvchan)
+
+vchan-node2: $(NODE2_OBJS) libvchan.so
+ $(CC) $(LDFLAGS) -o $@ $(NODE2_OBJS) libvchan.so $(LDLIBS_libvchan)
+
+.PHONY: install
+install: all
+ $(INSTALL_DIR) $(DESTDIR)$(LIBDIR)
+ $(INSTALL_DIR) $(DESTDIR)$(INCLUDEDIR)
+ $(INSTALL_PROG) libvchan.so.$(MAJOR).$(MINOR) $(DESTDIR)$(LIBDIR)
+ ln -sf libvchan.so.$(MAJOR).$(MINOR)
$(DESTDIR)$(LIBDIR)/libvchan.so.$(MAJOR)
+ ln -sf libvchan.so.$(MAJOR) $(DESTDIR)$(LIBDIR)/libvchan.so
+ $(INSTALL_DATA) libvchan.a $(DESTDIR)$(LIBDIR)
+ $(INSTALL_DATA) libvchan.h $(DESTDIR)$(INCLUDEDIR)
+
+.PHONY: clean
+clean:
+ $(RM) -f *.o *.so* *.a vchan-node1 vchan-node2 $(DEPS)
+
+distclean: clean
+
+-include $(DEPS)
diff --git a/tools/libvchan/gntalloc.h b/tools/libvchan/gntalloc.h
new file mode 100644
index 0000000..76bd580
--- /dev/null
+++ b/tools/libvchan/gntalloc.h
@@ -0,0 +1,82 @@
+/******************************************************************************
+ * gntalloc.h
+ *
+ * Interface to /dev/xen/gntalloc.
+ *
+ * Author: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
+ *
+ * This file is in the public domain.
+ */
+
+#ifndef __LINUX_PUBLIC_GNTALLOC_H__
+#define __LINUX_PUBLIC_GNTALLOC_H__
+
+/*
+ * Allocates a new page and creates a new grant reference.
+ */
+#define IOCTL_GNTALLOC_ALLOC_GREF \
+_IOC(_IOC_NONE, 'G', 5, sizeof(struct ioctl_gntalloc_alloc_gref))
+struct ioctl_gntalloc_alloc_gref {
+ /* IN parameters */
+ /* The ID of the domain to be given access to the grants. */
+ uint16_t domid;
+ /* Flags for this mapping */
+ uint16_t flags;
+ /* Number of pages to map */
+ uint32_t count;
+ /* OUT parameters */
+ /* The offset to be used on a subsequent call to mmap(). */
+ uint64_t index;
+ /* The grant references of the newly created grant, one per page */
+ /* Variable size, depending on count */
+ uint32_t gref_ids[1];
+};
+
+#define GNTALLOC_FLAG_WRITABLE 1
+
+/*
+ * Deallocates the grant reference, allowing the associated page to be freed if
+ * no other domains are using it.
+ */
+#define IOCTL_GNTALLOC_DEALLOC_GREF \
+_IOC(_IOC_NONE, 'G', 6, sizeof(struct ioctl_gntalloc_dealloc_gref))
+struct ioctl_gntalloc_dealloc_gref {
+ /* IN parameters */
+ /* The offset returned in the map operation */
+ uint64_t index;
+ /* Number of references to unmap */
+ uint32_t count;
+};
+
+/*
+ * Sets up an unmap notification within the page, so that the other side can do
+ * cleanup if this side crashes. Required to implement cross-domain robust
+ * mutexes or close notification on communication channels.
+ *
+ * Each mapped page only supports one notification; multiple calls referring to
+ * the same page overwrite the previous notification. You must clear the
+ * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
+ * to occur.
+ */
+#define IOCTL_GNTALLOC_SET_UNMAP_NOTIFY \
+_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntalloc_unmap_notify))
+struct ioctl_gntalloc_unmap_notify {
+ /* IN parameters */
+ /* Offset in the file descriptor for a byte within the page (same as
+ * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
+ * be cleared. Otherwise, it can be any byte in the page whose
+ * notification we are adjusting.
+ */
+ uint64_t index;
+ /* Action(s) to take on unmap */
+ uint32_t action;
+ /* Event channel to notify */
+ uint32_t event_channel_port;
+};
+
+/* Clear (set to zero) the byte specified by index */
+#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
+/* Send an interrupt on the indicated event channel */
+#define UNMAP_NOTIFY_SEND_EVENT 0x2
+
+#endif /* __LINUX_PUBLIC_GNTALLOC_H__ */
diff --git a/tools/libvchan/gntdev.h b/tools/libvchan/gntdev.h
new file mode 100644
index 0000000..5304bd3
--- /dev/null
+++ b/tools/libvchan/gntdev.h
@@ -0,0 +1,150 @@
+/******************************************************************************
+ * gntdev.h
+ *
+ * Interface to /dev/xen/gntdev.
+ *
+ * Copyright (c) 2007, D G Murray
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (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.
+ */
+
+#ifndef __LINUX_PUBLIC_GNTDEV_H__
+#define __LINUX_PUBLIC_GNTDEV_H__
+
+struct ioctl_gntdev_grant_ref {
+ /* The domain ID of the grant to be mapped. */
+ uint32_t domid;
+ /* The grant reference of the grant to be mapped. */
+ uint32_t ref;
+};
+
+/*
+ * Inserts the grant references into the mapping table of an instance
+ * of gntdev. N.B. This does not perform the mapping, which is deferred
+ * until mmap() is called with @index as the offset.
+ */
+#define IOCTL_GNTDEV_MAP_GRANT_REF \
+_IOC(_IOC_NONE, 'G', 0, sizeof(struct ioctl_gntdev_map_grant_ref))
+struct ioctl_gntdev_map_grant_ref {
+ /* IN parameters */
+ /* The number of grants to be mapped. */
+ uint32_t count;
+ uint32_t pad;
+ /* OUT parameters */
+ /* The offset to be used on a subsequent call to mmap(). */
+ uint64_t index;
+ /* Variable IN parameter. */
+ /* Array of grant references, of size @count. */
+ struct ioctl_gntdev_grant_ref refs[1];
+};
+
+/*
+ * Removes the grant references from the mapping table of an instance of
+ * of gntdev. N.B. munmap() must be called on the relevant virtual address(es)
+ * before this ioctl is called, or an error will result.
+ */
+#define IOCTL_GNTDEV_UNMAP_GRANT_REF \
+_IOC(_IOC_NONE, 'G', 1, sizeof(struct ioctl_gntdev_unmap_grant_ref))
+struct ioctl_gntdev_unmap_grant_ref {
+ /* IN parameters */
+ /* The offset was returned by the corresponding map operation. */
+ uint64_t index;
+ /* The number of pages to be unmapped. */
+ uint32_t count;
+ uint32_t pad;
+};
+
+/*
+ * Returns the offset in the driver's address space that corresponds
+ * to @vaddr. This can be used to perform a munmap(), followed by an
+ * UNMAP_GRANT_REF ioctl, where no state about the offset is retained by
+ * the caller. The number of pages that were allocated at the same time as
+ * @vaddr is returned in @count.
+ *
+ * N.B. Where more than one page has been mapped into a contiguous range, the
+ * supplied @vaddr must correspond to the start of the range; otherwise
+ * an error will result. It is only possible to munmap() the entire
+ * contiguously-allocated range at once, and not any subrange thereof.
+ */
+#define IOCTL_GNTDEV_GET_OFFSET_FOR_VADDR \
+_IOC(_IOC_NONE, 'G', 2, sizeof(struct ioctl_gntdev_get_offset_for_vaddr))
+struct ioctl_gntdev_get_offset_for_vaddr {
+ /* IN parameters */
+ /* The virtual address of the first mapped page in a range. */
+ uint64_t vaddr;
+ /* OUT parameters */
+ /* The offset that was used in the initial mmap() operation. */
+ uint64_t offset;
+ /* The number of pages mapped in the VM area that begins at @vaddr. */
+ uint32_t count;
+ uint32_t pad;
+};
+
+/*
+ * Sets the maximum number of grants that may mapped at once by this gntdev
+ * instance.
+ *
+ * N.B. This must be called before any other ioctl is performed on the device.
+ */
+#define IOCTL_GNTDEV_SET_MAX_GRANTS \
+_IOC(_IOC_NONE, 'G', 3, sizeof(struct ioctl_gntdev_set_max_grants))
+struct ioctl_gntdev_set_max_grants {
+ /* IN parameter */
+ /* The maximum number of grants that may be mapped at once. */
+ uint32_t count;
+};
+
+/*
+ * Sets up an unmap notification within the page, so that the other side can do
+ * cleanup if this side crashes. Required to implement cross-domain robust
+ * mutexes or close notification on communication channels.
+ *
+ * Each mapped page only supports one notification; multiple calls referring to
+ * the same page overwrite the previous notification. You must clear the
+ * notification prior to the IOCTL_GNTALLOC_DEALLOC_GREF if you do not want it
+ * to occur.
+ */
+#define IOCTL_GNTDEV_SET_UNMAP_NOTIFY \
+_IOC(_IOC_NONE, 'G', 7, sizeof(struct ioctl_gntdev_unmap_notify))
+struct ioctl_gntdev_unmap_notify {
+ /* IN parameters */
+ /* Offset in the file descriptor for a byte within the page (same as
+ * used in mmap). If using UNMAP_NOTIFY_CLEAR_BYTE, this is the byte to
+ * be cleared. Otherwise, it can be any byte in the page whose
+ * notification we are adjusting.
+ */
+ uint64_t index;
+ /* Action(s) to take on unmap */
+ uint32_t action;
+ /* Event channel to notify */
+ uint32_t event_channel_port;
+};
+
+/* Clear (set to zero) the byte specified by index */
+#define UNMAP_NOTIFY_CLEAR_BYTE 0x1
+/* Send an interrupt on the indicated event channel */
+#define UNMAP_NOTIFY_SEND_EVENT 0x2
+
+#endif /* __LINUX_PUBLIC_GNTDEV_H__ */
diff --git a/tools/libvchan/init.c b/tools/libvchan/init.c
new file mode 100644
index 0000000..0cf00e2
--- /dev/null
+++ b/tools/libvchan/init.c
@@ -0,0 +1,456 @@
+/**
+ * @file
+ * @section AUTHORS
+ *
+ * Copyright (C) 2010 Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ *
+ * Authors:
+ * Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ * Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
+ *
+ * @section LICENSE
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * @section DESCRIPTION
+ *
+ * This file contains the setup code used to establish the ring buffer.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <sys/user.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <xs.h>
+#include <xen/sys/evtchn.h>
+
+#include "libvchan.h"
+#include "gntalloc.h"
+#include "gntdev.h"
+
+#ifndef PAGE_SHIFT
+#define PAGE_SHIFT 12
+#endif
+
+#ifndef PAGE_SIZE
+#define PAGE_SIZE 4096
+#endif
+
+#ifndef offsetof
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
+
+#define max(a,b) ((a > b) ? a : b)
+
+static int init_gnt_srv(struct libvchan *ctrl)
+{
+ int pages_left = ctrl->read.order >= PAGE_SHIFT ? 1 <<
(ctrl->read.order - PAGE_SHIFT) : 0;
+ int pages_right = ctrl->write.order >= PAGE_SHIFT ? 1 <<
(ctrl->write.order - PAGE_SHIFT) : 0;
+
+ int ring_fd = open("/dev/xen/gntalloc", O_RDWR);
+ int ring_ref = -1;
+ if (ring_fd < 0)
+ return -1;
+ struct ioctl_gntalloc_alloc_gref *gref_info = malloc(
+ sizeof(struct ioctl_gntalloc_alloc_gref) + max(pages_left,
pages_right)*sizeof(uint32_t));
+
+ gref_info->domid = ctrl->other_domain_id;
+ gref_info->flags = GNTALLOC_FLAG_WRITABLE;
+ gref_info->count = 1;
+
+ int err = ioctl(ring_fd, IOCTL_GNTALLOC_ALLOC_GREF, gref_info);
+ if (err)
+ goto out;
+
+ void* ring = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
ring_fd, gref_info->index);
+
+ if (ring == MAP_FAILED)
+ goto out;
+
+ ctrl->ring = ring;
+ ring_ref = gref_info->gref_ids[0];
+
+ memset(ring, 0, PAGE_SIZE);
+
+ ctrl->read.shr = &ctrl->ring->left;
+ ctrl->write.shr = &ctrl->ring->right;
+ ctrl->ring->left_order = ctrl->read.order;
+ ctrl->ring->right_order = ctrl->write.order;
+ ctrl->ring->cli_live = 2;
+ ctrl->ring->srv_live = 1;
+ ctrl->ring->debug = 0xabcd;
+
+#ifdef IOCTL_GNTALLOC_SET_UNMAP_NOTIFY
+ {
+ struct ioctl_gntalloc_unmap_notify arg;
+ arg.index = gref_info->index + offsetof(struct vchan_interface,
srv_live);
+ arg.action = UNMAP_NOTIFY_CLEAR_BYTE | UNMAP_NOTIFY_SEND_EVENT;
+ arg.event_channel_port = ctrl->event_port;
+ ioctl(ring_fd, IOCTL_GNTALLOC_SET_UNMAP_NOTIFY, &arg);
+ }
+#endif
+
+ if (ctrl->read.order == 10) {
+ ctrl->read.buffer = ((void*)ctrl->ring) + 1024;
+ } else if (ctrl->read.order == 11) {
+ ctrl->read.buffer = ((void*)ctrl->ring) + 2048;
+ } else {
+ gref_info->count = pages_left;
+ err = ioctl(ring_fd, IOCTL_GNTALLOC_ALLOC_GREF, gref_info);
+ if (err)
+ goto out_ring;
+ void* area = mmap(NULL, pages_left * PAGE_SIZE, PROT_READ |
PROT_WRITE,
+ MAP_SHARED, ring_fd, gref_info->index);
+ if (area == MAP_FAILED)
+ goto out_ring;
+ ctrl->read.buffer = area;
+ memcpy(ctrl->ring->grants, gref_info->gref_ids, pages_left *
sizeof(uint32_t));
+ }
+
+ if (ctrl->write.order == 10) {
+ ctrl->write.buffer = ((void*)ctrl->ring) + 1024;
+ } else if (ctrl->write.order == 11) {
+ ctrl->write.buffer = ((void*)ctrl->ring) + 2048;
+ } else {
+ gref_info->count = pages_right;
+ err = ioctl(ring_fd, IOCTL_GNTALLOC_ALLOC_GREF, gref_info);
+ if (err)
+ goto out_unmap_left;
+ void* area = mmap(NULL, pages_right * PAGE_SIZE, PROT_READ |
PROT_WRITE,
+ MAP_SHARED, ring_fd, gref_info->index);
+ if (area == MAP_FAILED)
+ goto out_unmap_left;
+ ctrl->write.buffer = area;
+ memcpy(ctrl->ring->grants + (pages_left * sizeof(uint32_t)),
+ gref_info->gref_ids, pages_right * sizeof(uint32_t));
+ }
+
+out:
+ close(ring_fd);
+ return ring_ref;
+out_unmap_left:
+ munmap(ctrl->read.buffer, pages_left * PAGE_SIZE);
+out_ring:
+ munmap(ring, PAGE_SIZE);
+ ring_ref = -1;
+ ctrl->ring = NULL;
+ ctrl->write.order = ctrl->read.order = 0;
+ goto out;
+}
+
+static void* do_gnt_map(int fd, int domid, uint32_t* pages, size_t npages,
uint64_t *index)
+{
+ int i, rv;
+ void* area = NULL;
+ struct ioctl_gntdev_map_grant_ref *gref_info;
+ gref_info = malloc(sizeof(*gref_info) +
npages*sizeof(gref_info->refs[0]));
+ gref_info->count = npages;
+ for(i=0; i < npages; i++) {
+ gref_info->refs[i].domid = domid;
+ gref_info->refs[i].ref = pages[i];
+ }
+
+ rv = ioctl(fd, IOCTL_GNTDEV_MAP_GRANT_REF, gref_info);
+ if (rv)
+ goto out;
+ if (index)
+ *index = gref_info->index;
+ area = mmap(NULL, PAGE_SIZE * npages, PROT_READ | PROT_WRITE,
MAP_SHARED, fd, gref_info->index);
+ if (area == MAP_FAILED) {
+ struct ioctl_gntdev_unmap_grant_ref undo = {
+ .index = gref_info->index,
+ .count = gref_info->count
+ };
+ ioctl(fd, IOCTL_GNTDEV_UNMAP_GRANT_REF, &undo);
+ area = NULL;
+ }
+ out:
+ free(gref_info);
+ return area;
+}
+
+static int init_gnt_cli(struct libvchan *ctrl, uint32_t ring_ref)
+{
+ int ring_fd = open("/dev/xen/gntdev", O_RDWR);
+ int rv = -1;
+ uint64_t ring_index;
+ if (ring_fd < 0)
+ return -1;
+
+ ctrl->ring = do_gnt_map(ring_fd, ctrl->other_domain_id, &ring_ref, 1,
&ring_index);
+
+ if (!ctrl->ring)
+ goto out;
+
+ ctrl->write.order = ctrl->ring->left_order;
+ ctrl->read.order = ctrl->ring->right_order;
+ ctrl->write.shr = &ctrl->ring->left;
+ ctrl->read.shr = &ctrl->ring->right;
+ if (ctrl->write.order < 10 || ctrl->write.order > 24)
+ goto out_unmap_ring;
+ if (ctrl->read.order < 10 || ctrl->read.order > 24)
+ goto out_unmap_ring;
+ if (ctrl->read.order == ctrl->write.order && ctrl->read.order < 12)
+ goto out_unmap_ring;
+
+ uint32_t* grants = ctrl->ring->grants;
+
+ if (ctrl->write.order == 10) {
+ ctrl->write.buffer = ((void*)ctrl->ring) + 1024;
+ } else if (ctrl->write.order == 11) {
+ ctrl->write.buffer = ((void*)ctrl->ring) + 2048;
+ } else {
+ int pages_left = 1 << (ctrl->write.order - PAGE_SHIFT);
+ ctrl->write.buffer = do_gnt_map(ring_fd, ctrl->other_domain_id,
grants, pages_left, NULL);
+ if (!ctrl->write.buffer)
+ goto out_unmap_ring;
+ grants += pages_left;
+ }
+
+ if (ctrl->read.order == 10) {
+ ctrl->read.buffer = ((void*)ctrl->ring) + 1024;
+ } else if (ctrl->read.order == 11) {
+ ctrl->read.buffer = ((void*)ctrl->ring) + 2048;
+ } else {
+ int pages_right = 1 << (ctrl->read.order - PAGE_SHIFT);
+ ctrl->read.buffer = do_gnt_map(ring_fd, ctrl->other_domain_id,
grants, pages_right, NULL);
+ if (!ctrl->read.buffer)
+ goto out_unmap_left;
+ }
+
+#ifdef IOCTL_GNTDEV_SET_UNMAP_NOTIFY
+ {
+ struct ioctl_gntdev_unmap_notify arg;
+ arg.index = ring_index + offsetof(struct vchan_interface,
cli_live);
+ arg.action = UNMAP_NOTIFY_CLEAR_BYTE | UNMAP_NOTIFY_SEND_EVENT;
+ arg.event_channel_port = ctrl->event_port;
+ ioctl(ring_fd, IOCTL_GNTDEV_SET_UNMAP_NOTIFY, &arg);
+ }
+#endif
+
+ rv = 0;
+ out:
+ close(ring_fd);
+ return rv;
+ out_unmap_left:
+ if (ctrl->write.order >= PAGE_SHIFT)
+ munmap(ctrl->write.buffer, 1 << ctrl->write.order);
+ out_unmap_ring:
+ munmap(ctrl->ring, PAGE_SIZE);
+ ctrl->ring = 0;
+ ctrl->write.order = ctrl->read.order = 0;
+ rv = -1;
+ goto out;
+}
+
+static int init_evt_srv(struct libvchan *ctrl)
+{
+ struct ioctl_evtchn_bind_unbound_port bind;
+ ctrl->event_fd = open("/dev/xen/evtchn", O_RDWR);
+ if (ctrl->event_fd < 0)
+ return -1;
+ bind.remote_domain = ctrl->other_domain_id;
+ ctrl->event_port = ioctl(ctrl->event_fd,
IOCTL_EVTCHN_BIND_UNBOUND_PORT, &bind);
+ if (ctrl->event_port < 0)
+ return -1;
+ write(ctrl->event_fd, &ctrl->event_port, sizeof(ctrl->event_port));
+ return 0;
+}
+
+static int init_xs_srv(struct libvchan *ctrl, int ring_ref)
+{
+ int ret = -1;
+ struct xs_handle *xs;
+ struct xs_permissions perms[2];
+ char buf[64];
+ char ref[16];
+ char* domid_str = NULL;
+ xs = xs_domain_open();
+ if (!xs)
+ goto fail;
+ domid_str = xs_read(xs, 0, "domid", NULL);
+ if (!domid_str)
+ goto fail_xs_open;
+
+ // owner domain is us
+ perms[0].id = atoi(domid_str);
+ // permissions for domains not listed = none
+ perms[0].perms = XS_PERM_NONE;
+ // other domains
+ perms[1].id = ctrl->other_domain_id;
+ perms[1].perms = XS_PERM_READ;
+
+ snprintf(ref, sizeof ref, "%d", ring_ref);
+ snprintf(buf, sizeof buf, "data/vchan/%d/ring-ref",
ctrl->device_number);
+ if (!xs_write(xs, 0, buf, ref, strlen(ref)))
+ goto fail_xs_open;
+ if (!xs_set_permissions(xs, 0, buf, perms, 2))
+ goto fail_xs_open;
+
+ snprintf(ref, sizeof ref, "%d", ctrl->event_port);
+ snprintf(buf, sizeof buf, "data/vchan/%d/event-channel",
ctrl->device_number);
+ if (!xs_write(xs, 0, buf, ref, strlen(ref)))
+ goto fail_xs_open;
+ if (!xs_set_permissions(xs, 0, buf, perms, 2))
+ goto fail_xs_open;
+
+ ret = 0;
+ fail_xs_open:
+ free(domid_str);
+ xs_daemon_close(xs);
+ fail:
+ return ret;
+}
+
+static int min_order(size_t siz)
+{
+ int rv = PAGE_SHIFT;
+ while (siz > (1 << rv))
+ rv++;
+ return rv;
+}
+
+struct libvchan *libvchan_server_init(int domain, int devno, size_t left_min,
size_t right_min)
+{
+ // if you go over this size, you'll have too many grants to fit in the
shared page.
+ size_t MAX_RING_SIZE = 256 * PAGE_SIZE;
+ if (left_min > MAX_RING_SIZE || right_min > MAX_RING_SIZE)
+ return 0;
+
+ struct libvchan *ctrl = malloc(sizeof(struct libvchan));
+ if (!ctrl)
+ return 0;
+
+ ctrl->other_domain_id = domain;
+ ctrl->device_number = devno;
+ ctrl->ring = NULL;
+ ctrl->event_fd = -1;
+ ctrl->is_server = 1;
+ ctrl->server_persist = 0;
+
+ ctrl->read.order = min_order(left_min);
+ ctrl->write.order = min_order(right_min);
+
+ // if we can avoid allocating extra pages by using in-page rings, do so
+#define MAX_SMALL_RING 1024
+#define MAX_LARGE_RING 2048
+ if (left_min <= MAX_SMALL_RING && right_min <= MAX_LARGE_RING) {
+ ctrl->read.order = 10;
+ ctrl->write.order = 11;
+ } else if (left_min <= MAX_LARGE_RING && right_min <= MAX_SMALL_RING) {
+ ctrl->read.order = 11;
+ ctrl->write.order = 10;
+ } else if (left_min <= MAX_LARGE_RING) {
+ ctrl->read.order = 11;
+ } else if (right_min <= MAX_LARGE_RING) {
+ ctrl->write.order = 11;
+ }
+ if (init_evt_srv(ctrl))
+ goto out;
+ int ring_ref = init_gnt_srv(ctrl);
+ if (ring_ref < 0)
+ goto out;
+ if (init_xs_srv(ctrl, ring_ref))
+ goto out;
+ return ctrl;
+out:
+ libvchan_close(ctrl);
+ return 0;
+}
+
+static int init_evt_cli(struct libvchan *ctrl)
+{
+ struct ioctl_evtchn_bind_interdomain bind;
+ ctrl->event_fd = open("/dev/xen/evtchn", O_RDWR);
+ if (ctrl->event_fd < 0)
+ return -1;
+
+ bind.remote_domain = ctrl->other_domain_id;
+ bind.remote_port = ctrl->event_port;
+ ctrl->event_port = ioctl(ctrl->event_fd, IOCTL_EVTCHN_BIND_INTERDOMAIN,
&bind);
+ if (ctrl->event_port < 0)
+ return -1;
+ return 0;
+}
+
+
+struct libvchan *libvchan_client_init(int domain, int devno)
+{
+ struct libvchan *ctrl = malloc(sizeof(struct libvchan));
+ struct xs_handle *xs = NULL;
+ char buf[64];
+ char *ref;
+ int ring_ref;
+ unsigned int len;
+ if (!ctrl)
+ return 0;
+ ctrl->other_domain_id = domain;
+ ctrl->device_number = devno;
+ ctrl->ring = NULL;
+ ctrl->event_fd = -1;
+ ctrl->write.order = ctrl->read.order = 0;
+ ctrl->is_server = 0;
+
+ xs = xs_daemon_open();
+ if (!xs)
+ xs = xs_domain_open();
+ if (!xs)
+ goto fail;
+
+// find xenstore entry
+ snprintf(buf, sizeof buf, "/local/domain/%d/data/vchan/%d/ring-ref",
+ ctrl->other_domain_id, ctrl->device_number);
+ ref = xs_read(xs, 0, buf, &len);
+ if (!ref)
+ goto fail;
+ ring_ref = atoi(ref);
+ free(ref);
+ if (!ring_ref)
+ goto fail;
+ snprintf(buf, sizeof buf,
"/local/domain/%d/data/vchan/%d/event-channel",
+ ctrl->other_domain_id, ctrl->device_number);
+ ref = xs_read(xs, 0, buf, &len);
+ if (!ref)
+ goto fail;
+ ctrl->event_port = atoi(ref);
+ free(ref);
+ if (!ctrl->event_port)
+ goto fail;
+
+// set up event channel
+ if (init_evt_cli(ctrl))
+ goto fail;
+
+// set up shared page(s)
+ if (init_gnt_cli(ctrl, ring_ref))
+ goto fail;
+
+ ctrl->ring->cli_live = 1;
+ ctrl->ring->debug = 0xabce;
+
+ out:
+ if (xs)
+ xs_daemon_close(xs);
+ return ctrl;
+ fail:
+ libvchan_close(ctrl);
+ ctrl = NULL;
+ goto out;
+}
diff --git a/tools/libvchan/io.c b/tools/libvchan/io.c
new file mode 100644
index 0000000..f95c7b0
--- /dev/null
+++ b/tools/libvchan/io.c
@@ -0,0 +1,270 @@
+/**
+ * @file
+ * @section AUTHORS
+ *
+ * Copyright (C) 2010 Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ *
+ * Authors:
+ * Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ * Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
+ *
+ * @section LICENSE
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * @section DESCRIPTION
+ *
+ * This file contains the communications interface built on the ring buffer.
+ */
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <xenctrl.h>
+
+#include "libvchan.h"
+
+#ifndef PAGE_SHIFT
+#define PAGE_SHIFT 12
+#endif
+
+#ifndef PAGE_SIZE
+#define PAGE_SIZE 4096
+#endif
+
+// allow vchan data to be easily observed in strace by doing a
+// writev() to FD -1 with the data being read/written.
+#ifndef VCHAN_DEBUG
+#define VCHAN_DEBUG 0
+#endif
+
+static uint32_t rd_prod(struct libvchan *ctrl)
+{
+ return ctrl->read.shr->prod;
+}
+
+static uint32_t* _rd_cons(struct libvchan *ctrl)
+{
+ return &ctrl->read.shr->cons;
+}
+#define rd_cons(x) (*_rd_cons(x))
+
+static uint32_t* _wr_prod(struct libvchan *ctrl)
+{
+ return &ctrl->write.shr->prod;
+}
+#define wr_prod(x) (*_wr_prod(x))
+
+static uint32_t wr_cons(struct libvchan *ctrl)
+{
+ return ctrl->write.shr->cons;
+}
+
+static const void* rd_ring(struct libvchan *ctrl)
+{
+ return ctrl->read.buffer;
+}
+
+static void* wr_ring(struct libvchan *ctrl)
+{
+ return ctrl->write.buffer;
+}
+
+static uint32_t wr_ring_size(struct libvchan *ctrl)
+{
+ return (1 << ctrl->write.order);
+}
+
+static uint32_t rd_ring_size(struct libvchan *ctrl)
+{
+ return (1 << ctrl->read.order);
+}
+
+int libvchan_data_ready(struct libvchan *ctrl)
+{
+ return rd_prod(ctrl) - rd_cons(ctrl);
+}
+
+int libvchan_buffer_space(struct libvchan *ctrl)
+{
+ return wr_ring_size(ctrl) - (wr_prod(ctrl) - wr_cons(ctrl));
+}
+
+static int do_notify(struct libvchan *ctrl)
+{
+ struct ioctl_evtchn_notify notify;
+ notify.port = ctrl->event_port;
+ return ioctl(ctrl->event_fd, IOCTL_EVTCHN_NOTIFY, ¬ify);
+}
+
+int libvchan_wait(struct libvchan *ctrl)
+{
+ int ret;
+ uint32_t dummy;
+ ret = read(ctrl->event_fd, &dummy, sizeof(dummy));
+ if (ret == -1)
+ return -1;
+ write(ctrl->event_fd, &dummy, sizeof(dummy));
+ return 0;
+}
+
+/**
+ * returns -1 on error, or size on success
+ */
+static int do_send(struct libvchan *ctrl, const void *data, size_t size)
+{
+ int real_idx = wr_prod(ctrl) & (wr_ring_size(ctrl) - 1);
+ int avail_contig = wr_ring_size(ctrl) - real_idx;
+ if (VCHAN_DEBUG) {
+ char metainfo[32];
+ struct iovec iov[2];
+ iov[0].iov_base = metainfo;
+ iov[0].iov_len = snprintf(metainfo, 32, "vchan wr %d/%d",
ctrl->other_domain_id, ctrl->device_number);
+ iov[1].iov_base = (void *)data;
+ iov[1].iov_len = size;
+ writev(-1, iov, 2);
+ }
+ if (avail_contig > size)
+ avail_contig = size;
+ memcpy(wr_ring(ctrl) + real_idx, data, avail_contig);
+ if (avail_contig < size)
+ {
+ // we rolled across the end of the ring
+ memcpy(wr_ring(ctrl), data + avail_contig, size - avail_contig);
+ }
+ wr_prod(ctrl) += size;
+ if (do_notify(ctrl) < 0)
+ return -1;
+ return size;
+}
+
+/**
+ * returns 0 if no buffer space is available, -1 on error, or size on success
+ */
+int libvchan_send(struct libvchan *ctrl, const void *data, size_t size)
+{
+ int avail = libvchan_buffer_space(ctrl);
+ if (!libvchan_is_open(ctrl))
+ return -1;
+ if (size > avail)
+ return 0;
+ return do_send(ctrl, data, size);
+}
+
+int libvchan_write(struct libvchan *ctrl, const void *data, size_t size)
+{
+ int avail = libvchan_buffer_space(ctrl);
+ if (!libvchan_is_open(ctrl))
+ return -1;
+ if (size > avail)
+ size = avail;
+ return do_send(ctrl, data, size);
+}
+
+static int do_recv(struct libvchan *ctrl, void *data, size_t size)
+{
+ int real_idx = rd_cons(ctrl) & (rd_ring_size(ctrl) - 1);
+ int avail_contig = rd_ring_size(ctrl) - real_idx;
+ if (avail_contig > size)
+ avail_contig = size;
+ memcpy(data, rd_ring(ctrl) + real_idx, avail_contig);
+ if (avail_contig < size)
+ {
+ // we rolled across the end of the ring
+ memcpy(data + avail_contig, rd_ring(ctrl), size - avail_contig);
+ }
+ rd_cons(ctrl) += size;
+ if (VCHAN_DEBUG) {
+ char metainfo[32];
+ struct iovec iov[2];
+ iov[0].iov_base = metainfo;
+ iov[0].iov_len = snprintf(metainfo, 32, "vchan rd %d/%d",
ctrl->other_domain_id, ctrl->device_number);
+ iov[1].iov_base = data;
+ iov[1].iov_len = size;
+ writev(-1, iov, 2);
+ }
+ if (do_notify(ctrl) < 0)
+ return -1;
+ return size;
+}
+
+/**
+ * reads exactly size bytes from the vchan.
+ * returns 0 if insufficient data is available, -1 on error, or size on success
+ */
+int libvchan_recv(struct libvchan *ctrl, void *data, size_t size)
+{
+ int avail = libvchan_data_ready(ctrl);
+ if (size <= avail)
+ return do_recv(ctrl, data, size);
+ else if (libvchan_is_open(ctrl))
+ return 0;
+ else
+ return -1;
+}
+
+int libvchan_read(struct libvchan *ctrl, void *data, size_t size)
+{
+ int avail = libvchan_data_ready(ctrl);
+ if (size > avail)
+ size = avail;
+ if (avail)
+ return do_recv(ctrl, data, size);
+ else if (libvchan_is_open(ctrl))
+ return 0;
+ else
+ return -1;
+}
+
+int libvchan_is_open(struct libvchan* ctrl)
+{
+ if (ctrl->is_server)
+ return ctrl->server_persist || ctrl->ring->cli_live;
+ else
+ return ctrl->ring->srv_live;
+}
+
+/// The fd to use for select() set
+int libvchan_fd_for_select(struct libvchan *ctrl)
+{
+ return ctrl->event_fd;
+}
+
+void libvchan_close(struct libvchan *ctrl)
+{
+ if (!ctrl)
+ return;
+ if (ctrl->ring) {
+ if (ctrl->is_server)
+ ctrl->ring->srv_live = 0;
+ else
+ ctrl->ring->cli_live = 0;
+ munmap(ctrl->ring, PAGE_SIZE);
+ }
+ if (ctrl->event_fd != -1) {
+ if (ctrl->event_port > 0 && ctrl->ring)
+ do_notify(ctrl);
+ close(ctrl->event_fd);
+ }
+ if (ctrl->read.order >= PAGE_SHIFT)
+ munmap(ctrl->read.buffer, 1 << ctrl->read.order);
+ if (ctrl->write.order >= PAGE_SHIFT)
+ munmap(ctrl->write.buffer, 1 << ctrl->write.order);
+ free(ctrl);
+}
diff --git a/tools/libvchan/libvchan.h b/tools/libvchan/libvchan.h
new file mode 100644
index 0000000..a6c08f4
--- /dev/null
+++ b/tools/libvchan/libvchan.h
@@ -0,0 +1,141 @@
+/**
+ * @file
+ * @section AUTHORS
+ *
+ * Copyright (C) 2010 Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ *
+ * Authors:
+ * Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ * Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
+ *
+ * @section LICENSE
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * @section DESCRIPTION
+ *
+ * Originally borrowed from the Qubes OS Project, http://www.qubes-os.org,
+ * this code has been substantially rewritten to use the gntdev and gntalloc
+ * devices instead of raw MFN's and map_foreign_range.
+ *
+ * This is a library for inter-domain communication. A standard Xen ring
+ * buffer is used, with a datagram-based interface built on top. The grant
+ * reference is expected to be shared through some out-of-band mechanism
+ * such as XenStore.
+ */
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <xen/sys/evtchn.h>
+
+struct ring_shared {
+ uint32_t cons, prod;
+};
+
+/// struct vchan_interface is placed in memory shared between domains
+struct vchan_interface {
+ // standard consumer/producer interface, one pair per buffer
+ // left is client write, server read
+ // right is client read, server write
+ struct ring_shared left, right;
+ // size of the rings, which determines their location
+ // 10 - at offset 1024 in ring's page
+ // 11 - at offset 2048 in ring's page
+ // 12+ - uses 2^(N-12) grants to describe the multi-page ring
+ // These should remain constant once the page is shared.
+ // Only one of the two orders can be 10 (or 11).
+ uint16_t left_order, right_order;
+ // Shutdown detection
+ uint8_t cli_live, srv_live;
+ uint16_t debug;
+ // Grant list: ordering is left, right. Must not extend into actual ring
+ // or grow beyond the end of the initial shared page.
+ // These should remain constant once the page is shared, to allow
+ // for possible remapping by a client that restarts.
+ uint32_t grants[0];
+};
+
+struct libvchan_ring {
+ // Pointer into the shared page. Offsets into buffer
+ struct ring_shared* shr;
+ // ring data
+ void* buffer;
+ // size of the ring is (1 << order).
+ // This is used to constrain offsets to the buffer.
+ // (we can't trust the order in the shared page to remain constant)
+ int order;
+};
+
+/// struct libvchan is a control structure, passed to all library calls
+struct libvchan {
+ // person we communicate with
+ int other_domain_id;
+ // "port" we communicate on (allows multiple vchans to exist in
xenstore)
+ int device_number;
+ // Shared ring page, mapped using gntdev or gntalloc
+ // Note that the FD for gntdev or gntalloc has already been closed.
+ struct vchan_interface *ring;
+ // event channel interface (needs port for API)
+ int event_fd;
+ uint32_t event_port;
+ // informative flag
+ int is_server:1;
+ int server_persist:1;
+ struct libvchan_ring read, write;
+};
+
+/**
+ * Set up a vchan, including granting pages
+ * @param domain The peer domain that will be connecting
+ * @param devno A device number, used to identify this vchan in xenstore
+ * @param send_min The minimum size (in bytes) of the send ring (left)
+ * @param recv_min The minimum size (in bytes) of the receive ring (right)
+ * @return The structure, or NULL in case of an error
+ */
+struct libvchan *libvchan_server_init(int domain, int devno, size_t read_min,
size_t write_min);
+/**
+ * Connect to an existing vchan. Note: you can reconnect to an existing vchan
+ * safely, however no locking is performed, so you must prevent multiple
clients
+ * from connecting to a single server.
+ *
+ * @param domain The peer domain to connect to
+ * @param devno A device number, used to identify this vchan in xenstore
+ * @return The structure, or NULL in case of an error
+ */
+struct libvchan *libvchan_client_init(int domain, int devno);
+/**
+ * Close a vchan. This deallocates the vchan and attempts to free its
+ * resources. The other side is notified of the close, but can still read any
+ * data pending prior to the close.
+ */
+void libvchan_close(struct libvchan *ctrl);
+
+// reads exactly size or aborts
+int libvchan_recv(struct libvchan *ctrl, void *data, size_t size);
+// reads up to size bytes (including zero) without blocking
+int libvchan_read(struct libvchan *ctrl, void *data, size_t size);
+// sends entire buffer or aborts
+int libvchan_send(struct libvchan *ctrl, const void *data, size_t size);
+// sends as much data as possible without blocking
+int libvchan_write(struct libvchan *ctrl, const void *data, size_t size);
+// waits for reads or writes to unblock, or for a close
+int libvchan_wait(struct libvchan *ctrl);
+// (only) when this FD is readable, libvchan_wait() will not block
+int libvchan_fd_for_select(struct libvchan *ctrl);
+// return 0 when one side has called libvchan_close() or crashed
+// return 1 when both sides are open
+// return 2 [server only] when no client has yet connected
+int libvchan_is_open(struct libvchan* ctrl);
+int libvchan_data_ready(struct libvchan *ctrl);
+int libvchan_buffer_space(struct libvchan *ctrl);
diff --git a/tools/libvchan/node-select.c b/tools/libvchan/node-select.c
new file mode 100644
index 0000000..a7c614b
--- /dev/null
+++ b/tools/libvchan/node-select.c
@@ -0,0 +1,161 @@
+/**
+ * @file
+ * @section AUTHORS
+ *
+ * Copyright (C) 2010 Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ *
+ * Authors:
+ * Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ * Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
+ *
+ * @section LICENSE
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * @section DESCRIPTION
+ *
+ * This is a test program for libvchan. Communications are bidirectional,
+ * with either server (grant offeror) or client able to read and write.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "libvchan.h"
+
+void usage(char** argv)
+{
+ fprintf(stderr, "usage:\n"
+ "\t%s [client|server] domainid nodeid [rbufsiz wbufsiz]\n",
+ argv[0]);
+ exit(1);
+}
+
+#define BUFSIZE 5000
+char inbuf[BUFSIZE];
+char outbuf[BUFSIZE];
+int insiz = 0;
+int outsiz = 0;
+struct libvchan *ctrl = 0;
+
+void vchan_wr() {
+ if (!insiz)
+ return;
+ int ret = libvchan_write(ctrl, inbuf, insiz);
+ if (ret < 0) {
+ fprintf(stderr, "vchan write failed\n");
+ exit(1);
+ }
+ if (ret > 0) {
+ insiz -= ret;
+ memmove(inbuf, inbuf + ret, insiz);
+ }
+}
+
+void stdout_wr() {
+ if (!outsiz)
+ return;
+ int ret = write(1, outbuf, outsiz);
+ if (ret < 0 && errno != EAGAIN)
+ exit(1);
+ if (ret > 0) {
+ outsiz -= ret;
+ memmove(outbuf, outbuf + ret, outsiz);
+ }
+}
+
+/**
+ Simple libvchan application, both client and server.
+ Both sides may write and read, both from the libvchan and from
+ stdin/stdout (just like netcat).
+*/
+
+int main(int argc, char **argv)
+{
+ int ret;
+ int libvchan_fd;
+ if (argc < 4)
+ usage(argv);
+ if (!strcmp(argv[1], "server")) {
+ int rsiz = argc > 4 ? atoi(argv[4]) : 0;
+ int wsiz = argc > 5 ? atoi(argv[5]) : 0;
+ ctrl = libvchan_server_init(atoi(argv[2]), atoi(argv[3]), rsiz,
wsiz);
+ } else if (!strcmp(argv[1], "client"))
+ ctrl = libvchan_client_init(atoi(argv[2]), atoi(argv[3]));
+ else
+ usage(argv);
+ if (!ctrl) {
+ perror("libvchan_*_init");
+ exit(1);
+ }
+
+ fcntl(0, F_SETFL, O_NONBLOCK);
+ fcntl(1, F_SETFL, O_NONBLOCK);
+
+ libvchan_fd = libvchan_fd_for_select(ctrl);
+ for (;;) {
+ fd_set rfds;
+ fd_set wfds;
+ FD_ZERO(&rfds);
+ FD_ZERO(&wfds);
+ if (insiz != BUFSIZE)
+ FD_SET(0, &rfds);
+ if (outsiz)
+ FD_SET(1, &wfds);
+ FD_SET(libvchan_fd, &rfds);
+ ret = select(libvchan_fd + 1, &rfds, &wfds, NULL, NULL);
+ if (ret < 0) {
+ perror("select");
+ exit(1);
+ }
+ if (FD_ISSET(0, &rfds)) {
+ ret = read(0, inbuf + insiz, BUFSIZE - insiz);
+ if (ret < 0 && errno != EAGAIN)
+ exit(1);
+ if (ret == 0) {
+ while (insiz) {
+ vchan_wr();
+ libvchan_wait(ctrl);
+ }
+ return 0;
+ }
+ if (ret)
+ insiz += ret;
+ vchan_wr();
+ }
+ if (FD_ISSET(libvchan_fd, &rfds)) {
+ libvchan_wait(ctrl);
+ vchan_wr();
+ }
+ if (FD_ISSET(1, &wfds))
+ stdout_wr();
+ while (libvchan_data_ready(ctrl) && outsiz < BUFSIZE) {
+ ret = libvchan_read(ctrl, outbuf + outsiz, BUFSIZE -
outsiz);
+ if (ret < 0)
+ exit(1);
+ outsiz += ret;
+ stdout_wr();
+ }
+ if (!libvchan_is_open(ctrl)) {
+ fcntl(1, F_SETFL, 0);
+ while (outsiz)
+ stdout_wr();
+ return 0;
+ }
+ }
+}
diff --git a/tools/libvchan/node.c b/tools/libvchan/node.c
new file mode 100644
index 0000000..d00a50f
--- /dev/null
+++ b/tools/libvchan/node.c
@@ -0,0 +1,169 @@
+/**
+ * @file
+ * @section AUTHORS
+ *
+ * Copyright (C) 2010 Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ *
+ * Authors:
+ * Rafal Wojtczuk <rafal@xxxxxxxxxxxxxxxxxxxxxx>
+ * Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
+ *
+ * @section LICENSE
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; under version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * @section DESCRIPTION
+ *
+ * This is a test program for libvchan. Communications are in one direction,
+ * either server (grant offeror) to client or vice versa.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+
+#include "libvchan.h"
+
+int libvchan_write_all(struct libvchan *ctrl, char *buf, int size)
+{
+ int written = 0;
+ int ret;
+ while (written < size) {
+ ret = libvchan_write(ctrl, buf + written, size - written);
+ if (ret <= 0) {
+ perror("write");
+ exit(1);
+ }
+ written += ret;
+ }
+ return size;
+}
+
+int write_all(int fd, char *buf, int size)
+{
+ int written = 0;
+ int ret;
+ while (written < size) {
+ ret = write(fd, buf + written, size - written);
+ if (ret <= 0) {
+ perror("write");
+ exit(1);
+ }
+ written += ret;
+ }
+ return size;
+}
+
+void usage(char** argv)
+{
+ fprintf(stderr, "usage:\n"
+ "%s [client|server] [read|write] domid nodeid\n", argv[0]);
+ exit(1);
+}
+
+#define BUFSIZE 5000
+char buf[BUFSIZE];
+void reader(struct libvchan *ctrl)
+{
+ int size;
+ for (;;) {
+ size = rand() % (BUFSIZE - 1) + 1;
+ size = libvchan_read(ctrl, buf, size);
+ fprintf(stderr, "#");
+ if (size < 0) {
+ perror("read vchan");
+ libvchan_close(ctrl);
+ exit(1);
+ }
+ if (size == 0)
+ break;
+ size = write_all(1, buf, size);
+ if (size < 0) {
+ perror("stdout write");
+ exit(1);
+ }
+ if (size == 0) {
+ perror("write size=0?\n");
+ exit(1);
+ }
+ }
+}
+
+void writer(struct libvchan *ctrl)
+{
+ int size;
+ for (;;) {
+ size = rand() % (BUFSIZE - 1) + 1;
+ size = read(0, buf, size);
+ if (size < 0) {
+ perror("read stdin");
+ libvchan_close(ctrl);
+ exit(1);
+ }
+ if (size == 0)
+ break;
+ size = libvchan_write_all(ctrl, buf, size);
+ fprintf(stderr, "#");
+ if (size < 0) {
+ perror("vchan write");
+ exit(1);
+ }
+ if (size == 0) {
+ perror("write size=0?\n");
+ exit(1);
+ }
+ }
+}
+
+
+/**
+ Simple libvchan application, both client and server.
+ One side does writing, the other side does reading; both from
+ standard input/output fds.
+*/
+int main(int argc, char **argv)
+{
+ int seed = time(0);
+ struct libvchan *ctrl = 0;
+ int wr;
+ if (argc < 4)
+ usage(argv);
+ if (!strcmp(argv[2], "read"))
+ wr = 0;
+ else if (!strcmp(argv[2], "write"))
+ wr = 1;
+ else
+ usage(argv);
+ if (!strcmp(argv[1], "server"))
+ ctrl = libvchan_server_init(atoi(argv[3]), atoi(argv[4]), 0, 0);
+ else if (!strcmp(argv[1], "client"))
+ ctrl = libvchan_client_init(atoi(argv[3]), atoi(argv[4]));
+ else
+ usage(argv);
+ if (!ctrl) {
+ perror("libvchan_*_init");
+ exit(1);
+ }
+
+ srand(seed);
+ fprintf(stderr, "seed=%d\n", seed);
+ if (wr)
+ writer(ctrl);
+ else
+ reader(ctrl);
+ libvchan_close(ctrl);
+ return 0;
+}
--
1.7.6
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