cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
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glib-compat.h (3188B)

      1/*
      2 * GLIB Compatibility Functions
      3 *
      4 * Copyright IBM, Corp. 2013
      5 *
      6 * Authors:
      7 *  Anthony Liguori   <aliguori@us.ibm.com>
      8 *  Michael Tokarev   <mjt@tls.msk.ru>
      9 *  Paolo Bonzini     <pbonzini@redhat.com>
     10 *
     11 * This work is licensed under the terms of the GNU GPL, version 2 or later.
     12 * See the COPYING file in the top-level directory.
     13 *
     14 */
     15
     16#ifndef QEMU_GLIB_COMPAT_H
     17#define QEMU_GLIB_COMPAT_H
     18
     19/* Ask for warnings for anything that was marked deprecated in
     20 * the defined version, or before. It is a candidate for rewrite.
     21 */
     22#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_56
     23
     24/* Ask for warnings if code tries to use function that did not
     25 * exist in the defined version. These risk breaking builds
     26 */
     27#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_56
     28
     29#pragma GCC diagnostic push
     30#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
     31
     32#include <glib.h>
     33#if defined(G_OS_UNIX)
     34#include <glib-unix.h>
     35#include <sys/types.h>
     36#include <pwd.h>
     37#endif
     38
     39/*
     40 * Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing
     41 * use of functions from newer GLib via this compat header needs a little
     42 * trickery to prevent warnings being emitted.
     43 *
     44 * Consider a function from newer glib-X.Y that we want to use
     45 *
     46 *    int g_foo(const char *wibble)
     47 *
     48 * We must define a static inline function with the same signature that does
     49 * what we need, but with a "_qemu" suffix e.g.
     50 *
     51 * static inline void g_foo_qemu(const char *wibble)
     52 * {
     53 *     #if GLIB_CHECK_VERSION(X, Y, 0)
     54 *        g_foo(wibble)
     55 *     #else
     56 *        g_something_equivalent_in_older_glib(wibble);
     57 *     #endif
     58 * }
     59 *
     60 * The #pragma at the top of this file turns off -Wdeprecated-declarations,
     61 * ensuring this wrapper function impl doesn't trigger the compiler warning
     62 * about using too new glib APIs. Finally we can do
     63 *
     64 *   #define g_foo(a) g_foo_qemu(a)
     65 *
     66 * So now the code elsewhere in QEMU, which *does* have the
     67 * -Wdeprecated-declarations warning active, can call g_foo(...) as normal,
     68 * without generating warnings.
     69 */
     70
     71#if defined(G_OS_UNIX)
     72/*
     73 * Note: The fallback implementation is not MT-safe, and it returns a copy of
     74 * the libc passwd (must be g_free() after use) but not the content. Because of
     75 * these important differences the caller must be aware of, it's not #define for
     76 * GLib API substitution.
     77 */
     78static inline struct passwd *
     79g_unix_get_passwd_entry_qemu(const gchar *user_name, GError **error)
     80{
     81#if GLIB_CHECK_VERSION(2, 64, 0)
     82    return g_unix_get_passwd_entry(user_name, error);
     83#else
     84    struct passwd *p = getpwnam(user_name);
     85    if (!p) {
     86        g_set_error_literal(error, G_UNIX_ERROR, 0, g_strerror(errno));
     87        return NULL;
     88    }
     89    return (struct passwd *)g_memdup(p, sizeof(*p));
     90#endif
     91}
     92#endif /* G_OS_UNIX */
     93
     94static inline bool
     95qemu_g_test_slow(void)
     96{
     97    static int cached = -1;
     98    if (cached == -1) {
     99        cached = g_test_slow() || getenv("G_TEST_SLOW") != NULL;
    100    }
    101    return cached;
    102}
    103
    104#undef g_test_slow
    105#undef g_test_thorough
    106#undef g_test_quick
    107#define g_test_slow() qemu_g_test_slow()
    108#define g_test_thorough() qemu_g_test_slow()
    109#define g_test_quick() (!qemu_g_test_slow())
    110
    111#pragma GCC diagnostic pop
    112
    113#endif