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RmStartSession function (restartmanager.h)

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Starts a new Restart Manager session. A maximum of 64 Restart Manager sessions per user session can be open on the system at the same time. When this function starts a session, it returns a session handle and session key that can be used in subsequent calls to the Restart Manager API.

Syntax

DWORD RmStartSession(
  [out] DWORD    *pSessionHandle,
        DWORD    dwSessionFlags,
  [out] WCHAR [] strSessionKey
);

Parameters

[out] pSessionHandle

A pointer to the handle of a Restart Manager session. The session handle can be passed in subsequent calls to the Restart Manager API.

dwSessionFlags

Reserved. This parameter should be 0.

[out] strSessionKey

A null-terminated string that contains the session key to the new session. The string must be allocated before calling the RmStartSession function.

Return value

This is the most recent error received. The function can return one of the system error codes that are defined in Winerror.h.

Value Meaning
ERROR_SUCCESS
0
 The function completed successfully.
ERROR_SEM_TIMEOUT
121
 A Restart Manager function could not obtain a Registry write mutex in the allotted time. A system restart is recommended because further use of the Restart Manager is likely to fail.
ERROR_BAD_ARGUMENTS
160
 One or more arguments are not correct. This error value is returned by the Restart Manager function if a NULL pointer or 0 is passed in a parameter that requires a non-null and non-zero value.
ERROR_MAX_SESSIONS_REACHED
353
 The maximum number of sessions has been reached.
ERROR_WRITE_FAULT
29
 The system cannot write to the specified device.
ERROR_OUTOFMEMORY
14
 A Restart Manager operation could not complete because not enough memory was available.

Remarks

The RmStartSession function returns an error if a session with the same session key already exists.

The RmStartSession function should be called by the primary installer that controls the user interface or that controls the installation sequence of multiple patches in an update.

A secondary installer can join an existing Restart Manager session by calling the RmJoinSession function with the session handle and session key returned from the RmStartSession function call of the primary installer.

Requirements

Requirement Value
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header restartmanager.h
Library Rstrtmgr.lib
DLL Rstrtmgr.dll

See also

RmEndSession

RmJoinSession