DosSetSession

DosSetSession can set two status fields of a child session; selectable/non-selectable which specifies whether the child session will appear in the task list, and bond/no bond which specifies whether the parent or the child session will come to the foreground when the parent session is selected, this does not affect the parent sessions selections of foreground session.

Syntax

DosSetSession( ulIDSession, psd )

Parameters

ULONG ulIDSession (input)

The ID of the child session to set the status for.

PSTATUSDATA psd (input)

Pointer to a STATUSDATA structure.

Returns

APIRET rc

0   NO_ERROR
369 ERROR_SMG_INVALID_SESSION_ID
418 ERROR_SMG_INVALID_CALL
455 ERROR_SMG_INVALID_BOND_OPTION
456 ERROR_SMG_INVALID_SELECT_OPT
460 ERROR_SMG_PROCESS_NOT_PARENT
461 ERROR_SMG_INVALID_DATA_LENGTH
463 ERROR_SMG_RETRY_SUB_ALLOC

Usage Explanation

DosSetSession can only be issued on child sessions started with DosStartSession, with Related set to SSF_RELATED_CHILD (=1).

Gotchas

Some bond examples:

Parent process A
A's child process B
B's child process C
<-> bond
-X- no bond

A<->B<->C
A is selected => C is in the foreground

A-X-B<->C
A selects B => C is in the foreground

A<->B
B is non-selectable.
A is selected => B is in the foreground

Sample Code

#define INCL_DOSSESMGR
#include <os2.h>

ULONG ulIDSession;
STATUSDATA sd;

/* Start child session with DosStartSession */
/* psd->Related = SSF_RELATED_CHILD; */
/* DosStartSession(psd,&ulIDSession,..); */

sd.Length = 6;                         /* = sizeof(STATUSDATA) */
sd.SelectInd = SET_SESSION_UNCHANGED;  /* Do not change the selectability  */
sd.BondInd = SET_SESSION_BOND;         /* Want to establish a bond between */
                                       /* the parent and the child session */

if(DosSetSession(ulIDSession, &sd))    /* Establish the bond */
{
    /* Problems */
}
else
{
    /* The child session will now appear in the foreground when the parent */
    /* process is selected */
}

See Also

• DosStartSession, DosStopSession, DosSelectSession