6d593ab451
The glib function was introduced in 2.64. It's a safer version of getpwnam, and also simpler to use than getpwnam_r. Currently, it's only use by the next patch in qemu-ga, which doesn't (well well...) need the thread safety guarantees. Since the fallback version is still unsafe, I would rather keep the _qemu postfix, to make sure it's not being misused by mistake. When/if necessary, we can implement a safer fallback and drop the _qemu suffix. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com> *fix checkpatch warnings about newlines before/after block comments Signed-off-by: Michael Roth <michael.roth@amd.com>
106 lines
3.0 KiB
C
106 lines
3.0 KiB
C
/*
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* GLIB Compatibility Functions
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*
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* Copyright IBM, Corp. 2013
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Michael Tokarev <mjt@tls.msk.ru>
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* Paolo Bonzini <pbonzini@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_GLIB_COMPAT_H
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#define QEMU_GLIB_COMPAT_H
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/* Ask for warnings for anything that was marked deprecated in
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* the defined version, or before. It is a candidate for rewrite.
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*/
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#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_48
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/* Ask for warnings if code tries to use function that did not
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* exist in the defined version. These risk breaking builds
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*/
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#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_48
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#include <glib.h>
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#if defined(G_OS_UNIX)
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#include <glib-unix.h>
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#include <sys/types.h>
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#include <pwd.h>
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#endif
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/*
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* Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing
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* use of functions from newer GLib via this compat header needs a little
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* trickery to prevent warnings being emitted.
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*
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* Consider a function from newer glib-X.Y that we want to use
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*
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* int g_foo(const char *wibble)
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*
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* We must define a static inline function with the same signature that does
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* what we need, but with a "_qemu" suffix e.g.
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*
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* static inline void g_foo_qemu(const char *wibble)
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* {
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* #if GLIB_CHECK_VERSION(X, Y, 0)
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* g_foo(wibble)
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* #else
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* g_something_equivalent_in_older_glib(wibble);
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* #endif
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* }
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*
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* The #pragma at the top of this file turns off -Wdeprecated-declarations,
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* ensuring this wrapper function impl doesn't trigger the compiler warning
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* about using too new glib APIs. Finally we can do
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*
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* #define g_foo(a) g_foo_qemu(a)
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*
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* So now the code elsewhere in QEMU, which *does* have the
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* -Wdeprecated-declarations warning active, can call g_foo(...) as normal,
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* without generating warnings.
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*/
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#if defined(_WIN32) && !GLIB_CHECK_VERSION(2, 50, 0)
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/*
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* g_poll has a problem on Windows when using
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* timeouts < 10ms, so use wrapper.
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*/
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#define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout)
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gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout);
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#endif
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#if defined(G_OS_UNIX)
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/*
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* Note: The fallback implementation is not MT-safe, and it returns a copy of
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* the libc passwd (must be g_free() after use) but not the content. Because of
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* these important differences the caller must be aware of, it's not #define for
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* GLib API substitution.
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*/
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static inline struct passwd *
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g_unix_get_passwd_entry_qemu(const gchar *user_name, GError **error)
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{
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#if GLIB_CHECK_VERSION(2, 64, 0)
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return g_unix_get_passwd_entry(user_name, error);
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#else
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struct passwd *p = getpwnam(user_name);
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if (!p) {
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g_set_error_literal(error, G_UNIX_ERROR, 0, g_strerror(errno));
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return NULL;
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}
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return (struct passwd *)g_memdup(p, sizeof(*p));
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#endif
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}
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#endif /* G_OS_UNIX */
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#pragma GCC diagnostic pop
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#endif
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