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libvirt/tests/virpcimock.c
Thadeu Lima de Souza Cascardo 9a3d7a4778 Read PCI class from sysfs class file instead of config space. 
When determining if a device is behind a PCI bridge, the PCI device
class is checked by reading the config space. However, there are some
devices which have the wrong class on the config space, but the class is
initialized by Linux correctly as a PCI BRIDGE. This class can be read
by the sysfs file '/sys/bus/pci/devices/xxxx:xx:xx.x/class'.

One example of such bridge is IBM PCI Bridge 1014:03b9, which is
identified as a Host Bridge when reading the config space.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
2014-01-07 17:33:59 +01:00

980 lines
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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 "internal.h"
# include <stdio.h>
# include <dlfcn.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 (*realaccess)(const char *path, int mode);
static int (*reallstat)(const char *path, struct stat *sb);
static int (*real__lxstat)(int ver, const char *path, struct stat *sb);
static int (*realstat)(const char *path, struct stat *sb);
static int (*real__xstat)(int ver, const char *path, struct stat *sb);
static char *(*realcanonicalize_file_name)(const char *path);
static int (*realopen)(const char *path, int flags, ...);
static int (*realclose)(int fd);
static DIR * (*realopendir)(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 *fakesysfsdir;
# define PCI_SYSFS_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_SYSFS_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).
*
* 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
*
*/
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 */
};
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, ...);
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 = realopen(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",
fakesysfsdir,
path + strlen(PCI_SYSFS_PREFIX)) < 0) {
errno = ENOMEM;
goto cleanup;
}
if ((fd = realopen(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);
realclose(fd);
return ret;
}
static int
getrealpath(char **newpath,
const char *path)
{
if (!fakesysfsdir)
init_env();
if (STRPREFIX(path, PCI_SYSFS_PREFIX)) {
if (virAsprintfQuiet(newpath, "%s/%s",
fakesysfsdir,
path + strlen(PCI_SYSFS_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 *configSrc;
char tmp[32];
struct stat sb;
if (VIR_ALLOC_QUIET(dev) < 0 ||
virAsprintfQuiet(&configSrc, "%s/virpcitestdata/%s.config",
abs_srcdir, data->id) < 0 ||
virAsprintfQuiet(&devpath, "%s/devices/%s", fakesysfsdir, data->id) < 0)
ABORT_OOM();
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 ((realstat && realstat(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, ...)
{
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", fakesysfsdir, name) < 0)
ABORT_OOM();
if (virFileMakePath(driverpath) < 0)
ABORT("Unable to create: %s", driverpath);
va_start(args, name);
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) {
/* Device already bound */
errno = ENODEV;
return ret;
}
/* Make symlink under device tree */
if (virAsprintfQuiet(&devpath, "%s/devices/%s/driver",
fakesysfsdir, dev->id) < 0 ||
virAsprintfQuiet(&driverpath, "%s/drivers/%s",
fakesysfsdir, 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",
fakesysfsdir, dev->id) < 0 ||
virAsprintfQuiet(&driverpath, "%s/drivers/%s/%s",
fakesysfsdir, 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) {
/* Device not bound to the @driver */
errno = ENODEV;
return ret;
}
/* Make symlink under device tree */
if (virAsprintfQuiet(&devpath, "%s/devices/%s/driver",
fakesysfsdir, dev->id) < 0 ||
virAsprintfQuiet(&driverpath, "%s/drivers/%s/%s",
fakesysfsdir, 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_change(int fd ATTRIBUTE_UNUSED, const char *path)
{
int ret;
const char *file = last_component(path);
if (STREQ(file, "bind")) {
/* handle write to bind */
ret = pci_driver_handle_bind(path);
} else if (STREQ(file, "unbind")) {
/* handle write to unbind */
ret = pci_driver_handle_unbind(path);
} else if (STREQ(file, "new_id")) {
/* handle write to new_id */
ret = pci_driver_handle_new_id(path);
} else if (STREQ(file, "remove_id")) {
/* handle write to remove_id */
ret = pci_driver_handle_remove_id(path);
} else {
/* yet not handled write */
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) {
/* This should never happen (TM) */
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) {
/* This should never happen (TM) */
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 (realaccess)
return;
# define LOAD_SYM(name) \
do { \
if (!(real ## name = dlsym(RTLD_NEXT, #name))) \
ABORT("Cannot find real '%s' symbol\n", #name); \
} while (0)
# define LOAD_SYM_ALT(name1, name2) \
do { \
if (!(real ## name1 = dlsym(RTLD_NEXT, #name1)) && \
!(real ## name2 = dlsym(RTLD_NEXT, #name2))) \
ABORT("Cannot find real '%s' or '%s' symbol\n", \
#name1, #name2); \
} while (0)
LOAD_SYM(access);
LOAD_SYM_ALT(lstat, __lxstat);
LOAD_SYM_ALT(stat, __xstat);
LOAD_SYM(canonicalize_file_name);
LOAD_SYM(open);
LOAD_SYM(close);
LOAD_SYM(opendir);
}
static void
init_env(void)
{
if (fakesysfsdir)
return;
if (!(fakesysfsdir = getenv("LIBVIRT_FAKE_SYSFS_DIR")))
ABORT("Missing LIBVIRT_FAKE_SYSFS_DIR env variable\n");
# define MAKE_PCI_DRIVER(name, ...) \
pci_driver_new(name, __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);
# 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);
}
/*
*
* Mocked functions
*
*/
int
access(const char *path, int mode)
{
int ret;
init_syms();
if (STRPREFIX(path, PCI_SYSFS_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return -1;
ret = realaccess(newpath, mode);
VIR_FREE(newpath);
} else {
ret = realaccess(path, mode);
}
return ret;
}
int
__lxstat(int ver, const char *path, struct stat *sb)
{
int ret;
init_syms();
if (STRPREFIX(path, PCI_SYSFS_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, PCI_SYSFS_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return -1;
ret = reallstat(newpath, sb);
VIR_FREE(newpath);
} else {
ret = reallstat(path, sb);
}
return ret;
}
int
__xstat(int ver, const char *path, struct stat *sb)
{
int ret;
init_syms();
if (STRPREFIX(path, PCI_SYSFS_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, PCI_SYSFS_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return -1;
ret = realstat(newpath, sb);
VIR_FREE(newpath);
} else {
ret = realstat(path, sb);
}
return ret;
}
char *
canonicalize_file_name(const char *path)
{
char *ret;
init_syms();
if (STRPREFIX(path, PCI_SYSFS_PREFIX)) {
char *newpath;
if (getrealpath(&newpath, path) < 0)
return NULL;
ret = realcanonicalize_file_name(newpath);
VIR_FREE(newpath);
} else {
ret = realcanonicalize_file_name(path);
}
return ret;
}
int
open(const char *path, int flags, ...)
{
int ret;
char *newpath = NULL;
init_syms();
if (STRPREFIX(path, PCI_SYSFS_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 = realopen(newpath ? newpath : path, flags, mode);
} else {
ret = realopen(newpath ? newpath : path, flags);
}
/* Catch both: /sys/bus/pci/drivers/... and
* /sys/bus/pci/device/.../driver/... */
if (ret >= 0 && STRPREFIX(path, PCI_SYSFS_PREFIX) &&
strstr(path, "driver") && add_fd(ret, path) < 0) {
realclose(ret);
ret = -1;
}
VIR_FREE(newpath);
return ret;
}
DIR *
opendir(const char *path)
{
DIR *ret;
char *newpath = NULL;
init_syms();
if (STRPREFIX(path, PCI_SYSFS_PREFIX) &&
getrealpath(&newpath, path) < 0)
return NULL;
ret = realopendir(newpath ? newpath : path);
VIR_FREE(newpath);
return ret;
}
int
close(int fd)
{
if (remove_fd(fd) < 0)
return -1;
return realclose(fd);
}
#else
/* Nothing to override on non-__linux__ platforms */
#endif
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