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97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*
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* Copyright (C) 2014 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <dlfcn.h>
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#include <fcntl.h>
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#include "virusb.h"
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#define USB_SYSFS "/sys/bus/usb"
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#define FAKE_USB_SYSFS "virusbtestdata/sys_bus_usb"
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static int (*realopen)(const char *pathname, int flags, ...);
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static DIR *(*realopendir)(const char *name);
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static void init_syms(void)
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{
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if (realopen)
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return;
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realopen = dlsym(RTLD_NEXT, "open");
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realopendir = dlsym(RTLD_NEXT, "opendir");
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if (!realopen || !realopendir) {
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fprintf(stderr, "Error getting symbols");
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abort();
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}
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}
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static char *get_fake_path(const char *real_path)
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{
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const char *p = NULL;
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char *path = NULL;
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if ((p = STRSKIP(real_path, USB_SYSFS)))
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path = g_strdup_printf("%s/%s/%s", abs_srcdir, FAKE_USB_SYSFS, p);
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else if (!p)
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path = g_strdup(real_path);
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return path;
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}
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DIR *opendir(const char *name)
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{
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g_autofree char *path = NULL;
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init_syms();
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path = get_fake_path(name);
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return realopendir(path);
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}
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int open(const char *pathname, int flags, ...)
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{
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g_autofree char *path = NULL;
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int ret;
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va_list ap;
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mode_t mode = 0;
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init_syms();
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path = get_fake_path(pathname);
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if (!path)
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return -1;
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/* The mode argument is mandatory when O_CREAT is set in flags,
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* otherwise the argument is ignored.
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*/
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if (flags & O_CREAT) {
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va_start(ap, flags);
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mode = (mode_t) va_arg(ap, int);
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va_end(ap);
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}
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ret = realopen(path, flags, mode);
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return ret;
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}
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