diff options
author | Thiago Macieira <thiago.macieira@intel.com> | 2017-09-29 23:39:32 -0700 |
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committer | Thiago Macieira <thiago.macieira@intel.com> | 2017-11-05 18:34:09 +0000 |
commit | ed48a03b21630019181a324fff40d2426551253c (patch) | |
tree | b109157113c632827b2a12c8ea2be0ce087a2970 /src/corelib/global/qglobal.cpp | |
parent | 16fba4a28f119f87bbdad3f1e07b3df5b18953d2 (diff) |
QSysInfo: add a function that returns the boot ID
[ChangeLog][QtCore][QSysInfo] Added machineUniqueId() and
bootUniqueId().
Task-number: QTBUG-63425
Change-Id: I0b48fc8e90304e0dacc3fffd14e91064020d165b
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Diffstat (limited to 'src/corelib/global/qglobal.cpp')
-rw-r--r-- | src/corelib/global/qglobal.cpp | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/src/corelib/global/qglobal.cpp b/src/corelib/global/qglobal.cpp index 62d4624878..619436e3db 100644 --- a/src/corelib/global/qglobal.cpp +++ b/src/corelib/global/qglobal.cpp @@ -2873,7 +2873,7 @@ enum { this ID is usually permanent and it matches the D-Bus machine ID, except for nodes without their own storage (replicated nodes). - \sa machineHostName() + \sa machineHostName(), bootUniqueId() */ QByteArray QSysInfo::machineUniqueId() { @@ -2894,7 +2894,7 @@ QByteArray QSysInfo::machineUniqueId() return QByteArray(uuid, uuidlen); # endif #elif defined(Q_OS_UNIX) - // the modern name on Linux is /etc/machine-id, but that path is + // The modern name on Linux is /etc/machine-id, but that path is // unlikely to exist on non-Linux (non-systemd) systems. The old // path is more than enough. static const char fullfilename[] = "/usr/local/var/lib/dbus/machine-id"; @@ -2931,6 +2931,46 @@ QByteArray QSysInfo::machineUniqueId() } /*! + \since 5.10 + + Returns a unique ID for this machine's boot, if one can be determined. If + no unique ID could be determined, this function returns an empty byte + array. This value is expected to change after every boot and can be + considered globally unique. + + This function is currently only implemented for Linux and Apple operating + systems. + + \sa machineUniqueId() +*/ +QByteArray QSysInfo::bootUniqueId() +{ + // the boot unique ID cannot change + static const QByteArray cache = []() { +#ifdef Q_OS_LINUX + // use low-level API here for simplicity + int fd = qt_safe_open("/proc/sys/kernel/random/boot_id", O_RDONLY); + if (fd != -1) { + char uuid[UuidStringLen]; + qint64 len = qt_safe_read(fd, uuid, sizeof(uuid)); + qt_safe_close(fd); + if (len == UuidStringLen) + return QByteArray(uuid, UuidStringLen); + } +#elif defined(Q_OS_DARWIN) + // "kern.bootsessionuuid" is only available by name + char uuid[UuidStringLen]; + size_t uuidlen = sizeof(uuid); + if (sysctlbyname("kern.bootsessionuuid", uuid, &uuidlen, nullptr, 0) == 0 + && uuidlen == sizeof(uuid)) + return QByteArray(uuid, uuidlen); +#endif + return QByteArray(); + }(); + return cache; +}; + +/*! \macro void Q_ASSERT(bool test) \relates <QtGlobal> |