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https://github.com/libvirt/libvirt.git
synced 2026-10-02 12:20:06 -05:00
Michal Privoznik
300965f4f1
In some cases (well, majority), open() is either rewritten to open64(), either by plain '#define open open64') or at assembly level (using __REDIRECT macro). See <fcntl.h> for more info. This didn't really matter to us, because we do not chain load two mocks that would need to reimplement open() at the same time. But this is soon going to change. The problem is, that VIR_MOCK_REAL_INIT(open) glances over aforementioned rewrite and initializes real_open pointer to open() from the standard C library. But it needs to point to open() (well, open64()) from the next mock on the list. Therefore, init real_open to open64(). But of course, this is all glibc specific and for example musl does the oposite (#define open64 open). Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
119 lines
2.6 KiB
C
119 lines
2.6 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 "virmock.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 (*real_open)(const char *pathname, int flags, ...);
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#if WITH___OPEN_2
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static int (*real___open_2)(const char *path, int flags);
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#endif
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static DIR *(*real_opendir)(const char *name);
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static void init_syms(void)
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{
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if (real_open)
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return;
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#if defined(__GLIBC__) && defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64
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VIR_MOCK_REAL_INIT_ALIASED(open, "open64");
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#else
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VIR_MOCK_REAL_INIT(open);
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#endif
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#if WITH___OPEN_2
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VIR_MOCK_REAL_INIT(__open_2);
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#endif
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VIR_MOCK_REAL_INIT(opendir);
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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 real_opendir(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 = real_open(path, flags, mode);
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return ret;
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}
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#if WITH___OPEN_2
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int
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__open_2(const char *pathname, int flags)
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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(pathname);
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if (!path)
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return -1;
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return real_open(path, flags);
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}
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#endif
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