libvirt/tests/virusbmock.c

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/*
* Copyright (C) 2014 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/>.
*/
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <dlfcn.h>
#include <fcntl.h>
#include "viralloc.h"
#include "virfile.h"
#include "virstring.h"
#include "virusb.h"
#define USB_SYSFS "/sys/bus/usb"
#define FAKE_USB_SYSFS "virusbtestdata/sys_bus_usb"
static int (*realopen)(const char *pathname, int flags, ...);
static DIR *(*realopendir)(const char *name);
static void init_syms(void)
{
if (realopen)
return;
realopen = dlsym(RTLD_NEXT, "open");
realopendir = dlsym(RTLD_NEXT, "opendir");
if (!realopen || !realopendir) {
fprintf(stderr, "Error getting symbols");
abort();
}
}
static char *get_fake_path(const char *real_path)
{
const char *p = NULL;
char *path = NULL;
if ((p = STRSKIP(real_path, USB_SYSFS)) &&
virAsprintfQuiet(&path, "%s/%s/%s", abs_srcdir, FAKE_USB_SYSFS, p) < 0)
goto error;
else if (!p && VIR_STRDUP_QUIET(path, real_path) < 0)
goto error;
return path;
error:
errno = ENOMEM;
return NULL;
}
DIR *opendir(const char *name)
{
char *path;
DIR* ret;
init_syms();
path = get_fake_path(name);
ret = realopendir(path);
VIR_FREE(path);
return ret;
}
int open(const char *pathname, int flags, ...)
{
char *path;
int ret;
va_list ap;
mode_t mode = 0;
init_syms();
path = get_fake_path(pathname);
if (!path)
return -1;
/* The mode argument is mandatory when O_CREAT is set in flags,
* otherwise the argument is ignored.
*/
if (flags & O_CREAT) {
va_start(ap, flags);
mode = (mode_t) va_arg(ap, int);
va_end(ap);
}
ret = realopen(path, flags, mode);
VIR_FREE(path);
return ret;
}