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_40 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_40 28 29 #pragma GCC diagnostic push 30 #pragma GCC diagnostic ignored "-Wdeprecated-declarations" 31 32 #include <glib.h> 33 34 /* 35 * Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing 36 * use of functions from newer GLib via this compat header needs a little 37 * trickery to prevent warnings being emitted. 38 * 39 * Consider a function from newer glib-X.Y that we want to use 40 * 41 * int g_foo(const char *wibble) 42 * 43 * We must define a static inline function with the same signature that does 44 * what we need, but with a "_qemu" suffix e.g. 45 * 46 * static inline void g_foo_qemu(const char *wibble) 47 * { 48 * #if GLIB_CHECK_VERSION(X, Y, 0) 49 * g_foo(wibble) 50 * #else 51 * g_something_equivalent_in_older_glib(wibble); 52 * #endif 53 * } 54 * 55 * The #pragma at the top of this file turns off -Wdeprecated-declarations, 56 * ensuring this wrapper function impl doesn't trigger the compiler warning 57 * about using too new glib APIs. Finally we can do 58 * 59 * #define g_foo(a) g_foo_qemu(a) 60 * 61 * So now the code elsewhere in QEMU, which *does* have the 62 * -Wdeprecated-declarations warning active, can call g_foo(...) as normal, 63 * without generating warnings. 64 */ 65 66 static inline gboolean g_strv_contains_qemu(const gchar *const *strv, 67 const gchar *str) 68 { 69 #if GLIB_CHECK_VERSION(2, 44, 0) 70 return g_strv_contains(strv, str); 71 #else 72 g_return_val_if_fail(strv != NULL, FALSE); 73 g_return_val_if_fail(str != NULL, FALSE); 74 75 for (; *strv != NULL; strv++) { 76 if (g_str_equal(str, *strv)) { 77 return TRUE; 78 } 79 } 80 81 return FALSE; 82 #endif 83 } 84 #define g_strv_contains(a, b) g_strv_contains_qemu(a, b) 85 86 #if !GLIB_CHECK_VERSION(2, 58, 0) 87 typedef struct QemuGSpawnFds { 88 GSpawnChildSetupFunc child_setup; 89 gpointer user_data; 90 gint stdin_fd; 91 gint stdout_fd; 92 gint stderr_fd; 93 } QemuGSpawnFds; 94 95 static inline void 96 qemu_gspawn_fds_setup(gpointer user_data) 97 { 98 QemuGSpawnFds *q = (QemuGSpawnFds *)user_data; 99 100 dup2(q->stdin_fd, 0); 101 dup2(q->stdout_fd, 1); 102 dup2(q->stderr_fd, 2); 103 q->child_setup(q->user_data); 104 } 105 #endif 106 107 static inline gboolean 108 g_spawn_async_with_fds_qemu(const gchar *working_directory, 109 gchar **argv, 110 gchar **envp, 111 GSpawnFlags flags, 112 GSpawnChildSetupFunc child_setup, 113 gpointer user_data, 114 GPid *child_pid, 115 gint stdin_fd, 116 gint stdout_fd, 117 gint stderr_fd, 118 GError **error) 119 { 120 #if GLIB_CHECK_VERSION(2, 58, 0) 121 return g_spawn_async_with_fds(working_directory, argv, envp, flags, 122 child_setup, user_data, 123 child_pid, stdin_fd, stdout_fd, stderr_fd, 124 error); 125 #else 126 QemuGSpawnFds setup = { 127 .child_setup = child_setup, 128 .user_data = user_data, 129 .stdin_fd = stdin_fd, 130 .stdout_fd = stdout_fd, 131 .stderr_fd = stderr_fd, 132 }; 133 134 return g_spawn_async(working_directory, argv, envp, flags, 135 qemu_gspawn_fds_setup, &setup, 136 child_pid, error); 137 #endif 138 } 139 140 #define g_spawn_async_with_fds(wd, argv, env, f, c, d, p, ifd, ofd, efd, err) \ 141 g_spawn_async_with_fds_qemu(wd, argv, env, f, c, d, p, ifd, ofd, efd, err) 142 143 #if defined(_WIN32) && !GLIB_CHECK_VERSION(2, 50, 0) 144 /* 145 * g_poll has a problem on Windows when using 146 * timeouts < 10ms, so use wrapper. 147 */ 148 #define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout) 149 gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout); 150 #endif 151 152 153 #ifndef g_assert_cmpmem 154 #define g_assert_cmpmem(m1, l1, m2, l2) \ 155 do { \ 156 gconstpointer __m1 = m1, __m2 = m2; \ 157 int __l1 = l1, __l2 = l2; \ 158 if (__l1 != __l2) { \ 159 g_assertion_message_cmpnum( \ 160 G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \ 161 #l1 " (len(" #m1 ")) == " #l2 " (len(" #m2 "))", __l1, "==", \ 162 __l2, 'i'); \ 163 } else if (memcmp(__m1, __m2, __l1) != 0) { \ 164 g_assertion_message(G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \ 165 "assertion failed (" #m1 " == " #m2 ")"); \ 166 } \ 167 } while (0) 168 #endif 169 170 #pragma GCC diagnostic pop 171 172 #endif 173