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libvirt/tests/virpcimock.c

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/*
* Copyright (C) 2013 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
* Author: Michal Privoznik <mprivozn@redhat.com>
*/
#include <config.h>
#ifdef __linux__
# include "virmock.h"
# include <stdio.h>
# include <stdlib.h>
# include <unistd.h>
# include <fcntl.h>
# include <sys/stat.h>
# include <stdarg.h>
# include <dirent.h>
# include "viralloc.h"
# include "virstring.h"
# include "virfile.h"
# include "dirname.h"
static int (*real_access)(const char *path, int mode);
static int (*real_lstat)(const char *path, struct stat *sb);
static int (*real___lxstat)(int ver, const char *path, struct stat *sb);
static int (*real_stat)(const char *path, struct stat *sb);
static int (*real___xstat)(int ver, const char *path, struct stat *sb);
static char *(*real_canonicalize_file_name)(const char *path);
static int (*real_open)(const char *path, int flags, ...);
static int (*real_close)(int fd);
static DIR * (*real_opendir)(const char *name);
/* Don't make static, since it causes problems with clang
* when passed as an arg to virAsprintf()
* vircgroupmock.c:462:22: error: static variable 'fakesysfsdir' is used in an inline function with external linkage [-Werror,-Wstatic-in-inline]
*/
char *fakerootdir;
char *fakesysfspcidir;
# define SYSFS_PCI_PREFIX "/sys/bus/pci/"
# define STDERR(...) \
fprintf(stderr, "%s %zu: ", __FUNCTION__, (size_t) __LINE__); \
fprintf(stderr, __VA_ARGS__); \
fprintf(stderr, "\n"); \
# define ABORT(...) \
do { \
STDERR(__VA_ARGS__); \
abort(); \
} while (0)
# define ABORT_OOM() \
ABORT("Out of memory")
/*
* The plan:
*
* Mock some file handling functions. Redirect them into a stub tree passed via
* LIBVIRT_FAKE_ROOT_DIR env variable. All files and links within stub tree is
* created by us. There are some actions that we must take if some special
* files are written to. Here's the list of files we watch:
*
* /sys/bus/pci/drivers/<driver>/new_id:
* Learn the driver new vendor and device combination.
* Data in format "VVVV DDDD".
*
* /sys/bus/pci/drivers/<driver>/remove_id
* Make the driver forget about vendor and device.
* Data in format "VVVV DDDD".
*
* /sys/bus/pci/drivers/<driver>/bind
* Check if driver supports the device and bind driver to it (create symlink
* called 'driver' pointing to the /sys/but/pci/drivers/<driver>).
* Data in format "DDDD:BB:DD.F" (Domain:Bus:Device.Function).
*
* /sys/bus/pci/drivers/<driver>/unbind
* Unbind driver from the device.
* Data in format "DDDD:BB:DD.F" (Domain:Bus:Device.Function).
*
* /sys/bus/pci/drivers_probe
* Probe for a driver that handles the specified device.
* Data in format "DDDD:BB:DD.F" (Domain:Bus:Device.Function).
*
* As a little hack, we are not mocking write to these files, but close()
* instead. The advantage is we don't need any self growing array to hold the
* partial writes and construct them back. We can let all the writes finish,
* and then just read the file content back.
*/
/*
*
* Functions to model kernel behavior
*
*/
enum driverActions {
PCI_ACTION_BIND = 1 << 0,
PCI_ACTION_UNBIND = 1 << 1,
PCI_ACTION_NEW_ID = 1 << 2,
PCI_ACTION_REMOVE_ID = 1 << 3,
};
struct pciDriver {
char *name;
int *vendor; /* List of vendor:device IDs the driver can handle */
int *device;
size_t len; /* @len is used for both @vendor and @device */
unsigned int fail; /* Bitwise-OR of driverActions that should fail */
};
struct pciDevice {
char *id;
int vendor;
int device;
int class;
struct pciDriver *driver; /* Driver attached. NULL if attached to no driver */
};
struct fdCallback {
int fd;
char *path;
};
struct pciDevice **pciDevices = NULL;
size_t nPCIDevices = 0;
struct pciDriver **pciDrivers = NULL;
size_t nPCIDrivers = 0;
struct fdCallback *callbacks = NULL;
size_t nCallbacks = 0;
static void init_env(void);
static int pci_device_autobind(struct pciDevice *dev);
static void pci_device_new_from_stub(const struct pciDevice *data);
static struct pciDevice *pci_device_find_by_id(const char *id);
static struct pciDevice *pci_device_find_by_content(const char *path);
static void pci_driver_new(const char *name, int fail, ...);
static struct pciDriver *pci_driver_find_by_dev(struct pciDevice *dev);
static struct pciDriver *pci_driver_find_by_path(const char *path);
static int pci_driver_bind(struct pciDriver *driver, struct pciDevice *dev);
static int pci_driver_unbind(struct pciDriver *driver, struct pciDevice *dev);
static int pci_driver_handle_change(int fd, const char *path);
static int pci_driver_handle_bind(const char *path);
static int pci_driver_handle_unbind(const char *path);
static int pci_driver_handle_new_id(const char *path);
static int pci_driver_handle_remove_id(const char *path);
/*
* Helper functions
*/
static void
make_file(const char *path,
const char *name,
const char *value,
ssize_t len)
{
int fd = -1;
char *filepath = NULL;
if (value && len == -1)
len = strlen(value);
if (virAsprintfQuiet(&filepath, "%s/%s", path, name) < 0)
ABORT_OOM();
if ((fd = real_open(filepath, O_CREAT|O_WRONLY, 0666)) < 0)
ABORT("Unable to open: %s", filepath);
if (value && safewrite(fd, value, len) != len)
ABORT("Unable to write: %s", filepath);
VIR_FORCE_CLOSE(fd);
VIR_FREE(filepath);
}
static int
pci_read_file(const char *path,
char *buf,
size_t buf_size)
{
int ret = -1;
int fd = -1;
char *newpath;
if (virAsprintfQuiet(&newpath, "%s/%s",
fakesysfspcidir,
path + strlen(SYSFS_PCI_PREFIX)) < 0) {
errno = ENOMEM;
goto cleanup;
}
if ((fd = real_open(newpath, O_RDWR)) < 0)
goto cleanup;
bzero(buf, buf_size);
if (saferead(fd, buf, buf_size - 1) < 0) {
STDERR("Unable to read from %s", newpath);
goto cleanup;
}
if (ftruncate(fd, 0) < 0)
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(newpath);
real_close(fd);
return ret;
}
static int
getrealpath(char **newpath,
const char *path)
{
init_env();
if (STRPREFIX(path, SYSFS_PCI_PREFIX)) {
if (virAsprintfQuiet(newpath, "%s/%s",
fakesysfspcidir,
path + strlen(SYSFS_PCI_PREFIX)) < 0) {
errno = ENOMEM;
return -1;
}
} else {
if (VIR_STRDUP_QUIET(*newpath, path) < 0)
return -1;
}
return 0;
}
static bool
find_fd(int fd, size_t *indx)
{
size_t i;
for (i = 0; i < nCallbacks; i++) {
if (callbacks[i].fd == fd) {
if (indx)
*indx = i;
return true;
}
}
return false;
}
static int
add_fd(int fd, const char *path)
{
int ret = -1;
size_t i;
if (find_fd(fd, &i)) {
struct fdCallback cb = callbacks[i];
ABORT("FD %d %s already present in the array as %d %s",
fd, path, cb.fd, cb.path);
}
if (VIR_REALLOC_N_QUIET(callbacks, nCallbacks + 1) < 0 ||
VIR_STRDUP_QUIET(callbacks[nCallbacks].path, path) < 0) {
errno = ENOMEM;
goto cleanup;
}
callbacks[nCallbacks++].fd = fd;
ret = 0;
cleanup:
return ret;
}
static int
remove_fd(int fd)
{
int ret = -1;
size_t i;
if (find_fd(fd, &i)) {
struct fdCallback cb = callbacks[i];
if (pci_driver_handle_change(cb.fd, cb.path) < 0)
goto cleanup;
VIR_FREE(cb.path);
if (VIR_DELETE_ELEMENT(callbacks, i, nCallbacks) < 0) {
errno = EINVAL;
goto cleanup;
}
}
ret = 0;
cleanup:
return ret;
}
/*
* PCI Device functions
*/
static void
pci_device_new_from_stub(const struct pciDevice *data)
{
struct pciDevice *dev;
char *devpath;
char *id;
char *c;
char *configSrc;
char tmp[32];
struct stat sb;
if (VIR_STRDUP_QUIET(id, data->id) < 0)
ABORT_OOM();
/* Replace ':' with '-' to create the config filename from the
* device ID. The device ID cannot be used directly as filename
* because it contains ':' and Windows does not allow ':' in
* filenames. */
c = strchr(id, ':');
while (c) {
*c = '-';
c = strchr(c, ':');
}
if (VIR_ALLOC_QUIET(dev) < 0 ||
virAsprintfQuiet(&configSrc, "%s/virpcitestdata/%s.config",
abs_srcdir, id) < 0 ||
virAsprintfQuiet(&devpath, "%s/devices/%s", fakesysfspcidir, data->id) < 0)
ABORT_OOM();
VIR_FREE(id);
memcpy(dev, data, sizeof(*dev));
if (virFileMakePath(devpath) < 0)
ABORT("Unable to create: %s", devpath);
/* If there is a config file for the device within virpcitestdata dir,
* symlink it. Otherwise create a dummy config file. */
if ((real_stat && real_stat(configSrc, &sb) == 0) ||
(real___xstat && real___xstat(_STAT_VER, configSrc, &sb) == 0)) {
/* On success, copy @configSrc into the destination (a copy,
* rather than a symlink, is required since we write into the
* file, and parallel VPATH builds must not stomp on the
* original; besides, 'make distcheck' requires the original
* to be read-only */
char *buf;
ssize_t len;
if ((len = virFileReadAll(configSrc, 4096, &buf)) < 0)
ABORT("Unable to read config file '%s'", configSrc);
make_file(devpath, "config", buf, len);
VIR_FREE(buf);
} else {
/* If there's no config data in the virpcitestdata dir, create a dummy
* config file */
make_file(devpath, "config", "some dummy config", -1);
}
if (snprintf(tmp, sizeof(tmp), "0x%.4x", dev->vendor) < 0)
ABORT("@tmp overflow");
make_file(devpath, "vendor", tmp, -1);
if (snprintf(tmp, sizeof(tmp), "0x%.4x", dev->device) < 0)
ABORT("@tmp overflow");
make_file(devpath, "device", tmp, -1);
if (snprintf(tmp, sizeof(tmp), "0x%.4x", dev->class) < 0)
ABORT("@tmp overflow");
make_file(devpath, "class", tmp, -1);
if (pci_device_autobind(dev) < 0)
ABORT("Unable to bind: %s", data->id);
if (VIR_APPEND_ELEMENT_QUIET(pciDevices, nPCIDevices, dev) < 0)
ABORT_OOM();
VIR_FREE(devpath);
VIR_FREE(configSrc);
}
static struct pciDevice *
pci_device_find_by_id(const char *id)
{
size_t i;
for (i = 0; i < nPCIDevices; i++) {
struct pciDevice *dev = pciDevices[i];
if (STREQ(dev->id, id))
return dev;
}
return NULL;
}
static struct pciDevice *
pci_device_find_by_content(const char *path)
{
char tmp[32];
if (pci_read_file(path, tmp, sizeof(tmp)) < 0)
return NULL;
return pci_device_find_by_id(tmp);
}
static int
pci_device_autobind(struct pciDevice *dev)
{
struct pciDriver *driver = pci_driver_find_by_dev(dev);
if (!driver) {
/* No driver found. Nothing to do */
return 0;
}
return pci_driver_bind(driver, dev);
}
/*
* PCI Driver functions
*/
static void
pci_driver_new(const char *name, int fail, ...)
{
struct pciDriver *driver;
va_list args;
int vendor, device;
char *driverpath;
if (VIR_ALLOC_QUIET(driver) < 0 ||
VIR_STRDUP_QUIET(driver->name, name) < 0 ||
virAsprintfQuiet(&driverpath, "%s/drivers/%s", fakesysfspcidir, name) < 0)
ABORT_OOM();
driver->fail = fail;
if (virFileMakePath(driverpath) < 0)
ABORT("Unable to create: %s", driverpath);
va_start(args, fail);
while ((vendor = va_arg(args, int)) != -1) {
if ((device = va_arg(args, int)) == -1)
ABORT("Invalid vendor device pair for driver %s", name);
if (VIR_REALLOC_N_QUIET(driver->vendor, driver->len + 1) < 0 ||
VIR_REALLOC_N_QUIET(driver->device, driver->len + 1) < 0)
ABORT_OOM();
driver->vendor[driver->len] = vendor;
driver->device[driver->len] = device;
driver->len++;
}
va_end(args);
make_file(driverpath, "bind", NULL, -1);
make_file(driverpath, "unbind", NULL, -1);
make_file(driverpath, "new_id", NULL, -1);
make_file(driverpath, "remove_id", NULL, -1);
if (VIR_APPEND_ELEMENT_QUIET(pciDrivers, nPCIDrivers, driver) < 0)
ABORT_OOM();
}
static struct pciDriver *
pci_driver_find_by_dev(struct pciDevice *dev)
{
size_t i;
for (i = 0; i < nPCIDrivers; i++) {
struct pciDriver *driver = pciDrivers[i];
size_t j;
for (j = 0; j < driver->len; j++) {
if (driver->vendor[j] == dev->vendor &&
driver->device[j] == dev->device)
return driver;
}
}
return NULL;
}
static struct pciDriver *
pci_driver_find_by_path(const char *path)
{
size_t i;
for (i = 0; i < nPCIDrivers; i++) {
struct pciDriver *driver = pciDrivers[i];
if (strstr(path, driver->name))
return driver;
}
return NULL;
}
static int
pci_driver_bind(struct pciDriver *driver,
struct pciDevice *dev)
{
int ret = -1;
char *devpath = NULL, *driverpath = NULL;
if (dev->driver || PCI_ACTION_BIND & driver->fail) {
/* Device already bound or failing driver requested */
errno = ENODEV;
return ret;
}
/* Make symlink under device tree */
if (virAsprintfQuiet(&devpath, "%s/devices/%s/driver",
fakesysfspcidir, dev->id) < 0 ||
virAsprintfQuiet(&driverpath, "%s/drivers/%s",
fakesysfspcidir, driver->name) < 0) {
errno = ENOMEM;
goto cleanup;
}
if (symlink(driverpath, devpath) < 0)
goto cleanup;
/* Make symlink under driver tree */
VIR_FREE(devpath);
VIR_FREE(driverpath);
if (virAsprintfQuiet(&devpath, "%s/devices/%s",
fakesysfspcidir, dev->id) < 0 ||
virAsprintfQuiet(&driverpath, "%s/drivers/%s/%s",
fakesysfspcidir, driver->name, dev->id) < 0) {
errno = ENOMEM;
goto cleanup;
}
if (symlink(devpath, driverpath) < 0)
goto cleanup;
dev->driver = driver;
ret = 0;
cleanup:
VIR_FREE(devpath);
VIR_FREE(driverpath);
return ret;
}
static int
pci_driver_unbind(struct pciDriver *driver,
struct pciDevice *dev)
{
int ret = -1;
char *devpath = NULL, *driverpath = NULL;
if (dev->driver != driver || PCI_ACTION_UNBIND & driver->fail) {
/* Device not bound to the @driver or failing driver used */
errno = ENODEV;
return ret;
}
/* Make symlink under device tree */
if (virAsprintfQuiet(&devpath, "%s/devices/%s/driver",
fakesysfspcidir, dev->id) < 0 ||
virAsprintfQuiet(&driverpath, "%s/drivers/%s/%s",
fakesysfspcidir, driver->name, dev->id) < 0) {
errno = ENOMEM;
goto cleanup;
}
if (unlink(devpath) < 0 ||
unlink(driverpath) < 0)
goto cleanup;
dev->driver = NULL;
ret = 0;
cleanup:
VIR_FREE(devpath);
VIR_FREE(driverpath);
return ret;
}
static int
pci_driver_handle_drivers_probe(const char *path)
{
struct pciDevice *dev;
if (!(dev = pci_device_find_by_content(path))) {
errno = ENODEV;
return -1;
}
if (dev->driver)
return 0;
return pci_device_autobind(dev);
}
static int
pci_driver_handle_change(int fd ATTRIBUTE_UNUSED, const char *path)
{
int ret;
const char *file = last_component(path);
if (STREQ(file, "bind"))
ret = pci_driver_handle_bind(path);
else if (STREQ(file, "unbind"))
ret = pci_driver_handle_unbind(path);
else if (STREQ(file, "new_id"))
ret = pci_driver_handle_new_id(path);
else if (STREQ(file, "remove_id"))
ret = pci_driver_handle_remove_id(path);
else if (STREQ(file, "drivers_probe"))
ret = pci_driver_handle_drivers_probe(path);
else
ABORT("Not handled write to: %s", path);
return ret;
}
static int
pci_driver_handle_bind(const char *path)
{
int ret = -1;
struct pciDevice *dev = pci_device_find_by_content(path);
struct pciDriver *driver = pci_driver_find_by_path(path);
if (!driver || !dev) {
/* This should never happen (TM) */
errno = ENODEV;
goto cleanup;
}
ret = pci_driver_bind(driver, dev);
cleanup:
return ret;
}
static int
pci_driver_handle_unbind(const char *path)
{
int ret = -1;
struct pciDevice *dev = pci_device_find_by_content(path);
if (!dev || !dev->driver) {
/* This should never happen (TM) */
errno = ENODEV;
goto cleanup;
}
ret = pci_driver_unbind(dev->driver, dev);
cleanup:
return ret;
}
static int
pci_driver_handle_new_id(const char *path)
{
int ret = -1;
struct pciDriver *driver = pci_driver_find_by_path(path);
size_t i;
int vendor, device;
char buf[32];
if (!driver || PCI_ACTION_NEW_ID & driver->fail) {
errno = ENODEV;
goto cleanup;
}
if (pci_read_file(path, buf, sizeof(buf)) < 0)
goto cleanup;
if (sscanf(buf, "%x %x", &vendor, &device) < 2) {
errno = EINVAL;
goto cleanup;
}
for (i = 0; i < driver->len; i++) {
if (driver->vendor[i] == vendor &&
driver->device[i] == device)
break;
}
if (i == driver->len) {
if (VIR_REALLOC_N_QUIET(driver->vendor, driver->len + 1) < 0 ||
VIR_REALLOC_N_QUIET(driver->device, driver->len + 1) < 0) {
errno = ENOMEM;
goto cleanup;
}
driver->vendor[driver->len] = vendor;
driver->device[driver->len] = device;
driver->len++;
}
for (i = 0; i < nPCIDevices; i++) {
struct pciDevice *dev = pciDevices[i];
if (!dev->driver &&
dev->vendor == vendor &&
dev->device == device &&
pci_driver_bind(driver, dev) < 0)
goto cleanup;
}
ret = 0;
cleanup:
return ret;
}
static int
pci_driver_handle_remove_id(const char *path)
{
int ret = -1;
struct pciDriver *driver = pci_driver_find_by_path(path);
size_t i;
int vendor, device;
char buf[32];
if (!driver || PCI_ACTION_REMOVE_ID & driver->fail) {
errno = ENODEV;
goto cleanup;
}
if (pci_read_file(path, buf, sizeof(buf)) < 0)
goto cleanup;
if (sscanf(buf, "%x %x", &vendor, &device) < 2) {
errno = EINVAL;
goto cleanup;
}
for (i = 0; i < driver->len; i++) {
if (driver->vendor[i] == vendor &&
driver->device[i] == device)
continue;
}
if (i != driver->len) {
if (VIR_DELETE_ELEMENT(driver->vendor, i, driver->len) < 0)
goto cleanup;
driver->len++;
if (VIR_DELETE_ELEMENT(driver->device, i, driver->len) < 0)
goto cleanup;
}
ret = 0;
cleanup:
return ret;
}
/*
* Functions to load the symbols and init the environment
*/
static void
init_syms(void)
{
if (real_access)
return;
VIR_MOCK_REAL_INIT(access);
VIR_MOCK_REAL_INIT_ALT(lstat, __lxstat);
VIR_MOCK_REAL_INIT_ALT(stat, __xstat);
VIR_MOCK_REAL_INIT(canonicalize_file_name);
VIR_MOCK_REAL_INIT(open);
VIR_MOCK_REAL_INIT(close);
VIR_MOCK_REAL_INIT(opendir);
}
static void
init_env(void)
{
if (fakerootdir && fakesysfspcidir)
return;
if (!(fakerootdir = getenv("LIBVIRT_FAKE_ROOT_DIR")))
ABORT("Missing LIBVIRT_FAKE_ROOT_DIR env variable\n");
if (virAsprintfQuiet(&fakesysfspcidir, "%s%s",
fakerootdir, SYSFS_PCI_PREFIX) < 0)
ABORT_OOM();
if (virFileMakePath(fakesysfspcidir) < 0)
ABORT("Unable to create: %s", fakesysfspcidir);
make_file(fakesysfspcidir, "drivers_probe", NULL, -1);
# define MAKE_PCI_DRIVER(name, ...) \
pci_driver_new(name, 0, __VA_ARGS__, -1, -1)
MAKE_PCI_DRIVER("iwlwifi", 0x8086, 0x0044);
MAKE_PCI_DRIVER("i915", 0x8086, 0x0046, 0x8086, 0x0047);
MAKE_PCI_DRIVER("pci-stub", -1, -1);
pci_driver_new("vfio-pci", PCI_ACTION_BIND, -1, -1);
# define MAKE_PCI_DEVICE(Id, Vendor, Device, ...) \
do { \
struct pciDevice dev = {.id = (char *)Id, .vendor = Vendor, \
.device = Device, __VA_ARGS__}; \
pci_device_new_from_stub(&dev); \
} while (0)
MAKE_PCI_DEVICE("0000:00:00.0", 0x8086, 0x0044);
MAKE_PCI_DEVICE("0000:00:01.0", 0x8086, 0x0044);
MAKE_PCI_DEVICE("0000:00:02.0", 0x8086, 0x0046);
MAKE_PCI_DEVICE("0000:00:03.0", 0x8086, 0x0048);
MAKE_PCI_DEVICE("0001:00:00.0", 0x1014, 0x03b9, .class = 0x060400);
MAKE_PCI_DEVICE("0001:01:00.0", 0x8086, 0x105e);
MAKE_PCI_DEVICE("0001:01:00.1", 0x8086, 0x105e);
MAKE_PCI_DEVICE("0005:80:00.0", 0x10b5, 0x8112, .class = 0x060400);
MAKE_PCI_DEVICE("0005:90:01.0", 0x1033, 0x0035);
MAKE_PCI_DEVICE("0005:90:01.1", 0x1033, 0x0035);
MAKE_PCI_DEVICE("0005:90:01.2", 0x1033, 0x00e0);
MAKE_PCI_DEVICE("0000:0a:01.0", 0x8086, 0x0047);
MAKE_PCI_DEVICE("0000:0a:02.0", 0x8286, 0x0048);
MAKE_PCI_DEVICE("0000:0a:03.0", 0x8386, 0x0048);
}
/*
*
* Mocked functions
*
*/
int
access(const char *path, int mode)
{
int ret;
init_syms();
if (STRPREFIX(path, SYSFS_PCI_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return -1;
ret = real_access(newpath, mode);
VIR_FREE(newpath);
} else {
ret = real_access(path, mode);
}
return ret;
}
int
__lxstat(int ver, const char *path, struct stat *sb)
{
int ret;
init_syms();
if (STRPREFIX(path, SYSFS_PCI_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return -1;
ret = real___lxstat(ver, newpath, sb);
VIR_FREE(newpath);
} else {
ret = real___lxstat(ver, path, sb);
}
return ret;
}
int
lstat(const char *path, struct stat *sb)
{
int ret;
init_syms();
if (STRPREFIX(path, SYSFS_PCI_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return -1;
ret = real_lstat(newpath, sb);
VIR_FREE(newpath);
} else {
ret = real_lstat(path, sb);
}
return ret;
}
int
__xstat(int ver, const char *path, struct stat *sb)
{
int ret;
init_syms();
if (STRPREFIX(path, SYSFS_PCI_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return -1;
ret = real___xstat(ver, newpath, sb);
VIR_FREE(newpath);
} else {
ret = real___xstat(ver, path, sb);
}
return ret;
}
int
stat(const char *path, struct stat *sb)
{
int ret;
init_syms();
if (STRPREFIX(path, SYSFS_PCI_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return -1;
ret = real_stat(newpath, sb);
VIR_FREE(newpath);
} else {
ret = real_stat(path, sb);
}
return ret;
}
char *
canonicalize_file_name(const char *path)
{
char *ret;
init_syms();
if (STRPREFIX(path, SYSFS_PCI_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return NULL;
ret = real_canonicalize_file_name(newpath);
VIR_FREE(newpath);
} else {
ret = real_canonicalize_file_name(path);
}
return ret;
}
int
open(const char *path, int flags, ...)
{
int ret;
char *newpath = NULL;
init_syms();
if (STRPREFIX(path, SYSFS_PCI_PREFIX) &&
getrealpath(&newpath, path) < 0)
return -1;
if (flags & O_CREAT) {
va_list ap;
mode_t mode;
va_start(ap, flags);
mode = va_arg(ap, mode_t);
va_end(ap);
ret = real_open(newpath ? newpath : path, flags, mode);
} else {
ret = real_open(newpath ? newpath : path, flags);
}
/* Catch both: /sys/bus/pci/drivers/... and
* /sys/bus/pci/device/.../driver/... */
if (ret >= 0 && STRPREFIX(path, SYSFS_PCI_PREFIX) &&
strstr(path, "driver") && add_fd(ret, path) < 0) {
real_close(ret);
ret = -1;
}
VIR_FREE(newpath);
return ret;
}
DIR *
opendir(const char *path)
{
DIR *ret;
char *newpath = NULL;
init_syms();
if (STRPREFIX(path, SYSFS_PCI_PREFIX) &&
getrealpath(&newpath, path) < 0)
return NULL;
ret = real_opendir(newpath ? newpath : path);
VIR_FREE(newpath);
return ret;
}
int
close(int fd)
{
if (remove_fd(fd) < 0)
return -1;
return real_close(fd);
}
#else
/* Nothing to override on non-__linux__ platforms */
#endif
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