mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-30 15:00:34 +00:00
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
/*
|
|
* GLIB Compatibility Functions
|
|
*
|
|
* Copyright IBM, Corp. 2013
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
* Michael Tokarev <mjt@tls.msk.ru>
|
|
* Paolo Bonzini <pbonzini@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef QEMU_GLIB_COMPAT_H
|
|
#define QEMU_GLIB_COMPAT_H
|
|
|
|
/* Ask for warnings for anything that was marked deprecated in
|
|
* the defined version, or before. It is a candidate for rewrite.
|
|
*/
|
|
#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_48
|
|
|
|
/* Ask for warnings if code tries to use function that did not
|
|
* exist in the defined version. These risk breaking builds
|
|
*/
|
|
#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_48
|
|
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
|
|
|
|
#include <glib.h>
|
|
#if defined(G_OS_UNIX)
|
|
#include <glib-unix.h>
|
|
#include <sys/types.h>
|
|
#include <pwd.h>
|
|
#endif
|
|
|
|
/*
|
|
* Note that because of the GLIB_VERSION_MAX_ALLOWED constant above, allowing
|
|
* use of functions from newer GLib via this compat header needs a little
|
|
* trickery to prevent warnings being emitted.
|
|
*
|
|
* Consider a function from newer glib-X.Y that we want to use
|
|
*
|
|
* int g_foo(const char *wibble)
|
|
*
|
|
* We must define a static inline function with the same signature that does
|
|
* what we need, but with a "_qemu" suffix e.g.
|
|
*
|
|
* static inline void g_foo_qemu(const char *wibble)
|
|
* {
|
|
* #if GLIB_CHECK_VERSION(X, Y, 0)
|
|
* g_foo(wibble)
|
|
* #else
|
|
* g_something_equivalent_in_older_glib(wibble);
|
|
* #endif
|
|
* }
|
|
*
|
|
* The #pragma at the top of this file turns off -Wdeprecated-declarations,
|
|
* ensuring this wrapper function impl doesn't trigger the compiler warning
|
|
* about using too new glib APIs. Finally we can do
|
|
*
|
|
* #define g_foo(a) g_foo_qemu(a)
|
|
*
|
|
* So now the code elsewhere in QEMU, which *does* have the
|
|
* -Wdeprecated-declarations warning active, can call g_foo(...) as normal,
|
|
* without generating warnings.
|
|
*/
|
|
|
|
#if defined(_WIN32) && !GLIB_CHECK_VERSION(2, 50, 0)
|
|
/*
|
|
* g_poll has a problem on Windows when using
|
|
* timeouts < 10ms, so use wrapper.
|
|
*/
|
|
#define g_poll(fds, nfds, timeout) g_poll_fixed(fds, nfds, timeout)
|
|
gint g_poll_fixed(GPollFD *fds, guint nfds, gint timeout);
|
|
#endif
|
|
|
|
#if defined(G_OS_UNIX)
|
|
/*
|
|
* Note: The fallback implementation is not MT-safe, and it returns a copy of
|
|
* the libc passwd (must be g_free() after use) but not the content. Because of
|
|
* these important differences the caller must be aware of, it's not #define for
|
|
* GLib API substitution.
|
|
*/
|
|
static inline struct passwd *
|
|
g_unix_get_passwd_entry_qemu(const gchar *user_name, GError **error)
|
|
{
|
|
#if GLIB_CHECK_VERSION(2, 64, 0)
|
|
return g_unix_get_passwd_entry(user_name, error);
|
|
#else
|
|
struct passwd *p = getpwnam(user_name);
|
|
if (!p) {
|
|
g_set_error_literal(error, G_UNIX_ERROR, 0, g_strerror(errno));
|
|
return NULL;
|
|
}
|
|
return (struct passwd *)g_memdup(p, sizeof(*p));
|
|
#endif
|
|
}
|
|
#endif /* G_OS_UNIX */
|
|
|
|
#pragma GCC diagnostic pop
|
|
|
|
#endif
|