2 * GLIB Compatibility Functions
4 * Copyright IBM, Corp. 2013
7 * Anthony Liguori <aliguori@us.ibm.com>
8 * Michael Tokarev <mjt@tls.msk.ru>
9 * Paolo Bonzini <pbonzini@redhat.com>
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.
16 #ifndef QEMU_GLIB_COMPAT_H
17 #define QEMU_GLIB_COMPAT_H
19 /* Ask for warnings for anything that was marked deprecated in
20 * the defined version, or before. It is a candidate for rewrite.
22 #define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_48
24 /* Ask for warnings if code tries to use function that did not
25 * exist in the defined version. These risk breaking builds
27 #define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_48
29 #pragma GCC diagnostic push
30 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
33 #if defined(G_OS_UNIX)
34 #include <glib-unix.h>
35 #include <sys/types.h>
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.
44 * Consider a function from newer glib-X.Y that we want to use
46 * int g_foo(const char *wibble)
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.
51 * static inline void g_foo_qemu(const char *wibble)
53 * #if GLIB_CHECK_VERSION(X, Y, 0)
56 * g_something_equivalent_in_older_glib(wibble);
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
64 * #define g_foo(a) g_foo_qemu(a)
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.
71 #if defined(_WIN32) && !GLIB_CHECK_VERSION(2, 50, 0)
73 * g_poll has a problem on Windows when using
74 * timeouts < 10ms, so use wrapper.
76 #define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout)
77 gint
g_poll_fixed(GPollFD
*fds
, guint nfds
, gint timeout
);
80 #if defined(G_OS_UNIX)
82 * Note: The fallback implementation is not MT-safe, and it returns a copy of
83 * the libc passwd (must be g_free() after use) but not the content. Because of
84 * these important differences the caller must be aware of, it's not #define for
85 * GLib API substitution.
87 static inline struct passwd
*
88 g_unix_get_passwd_entry_qemu(const gchar
*user_name
, GError
**error
)
90 #if GLIB_CHECK_VERSION(2, 64, 0)
91 return g_unix_get_passwd_entry(user_name
, error
);
93 struct passwd
*p
= getpwnam(user_name
);
95 g_set_error_literal(error
, G_UNIX_ERROR
, 0, g_strerror(errno
));
98 return (struct passwd
*)g_memdup(p
, sizeof(*p
));
101 #endif /* G_OS_UNIX */
103 #pragma GCC diagnostic pop