Porting calls to qnx_spawn

QNX Newsgroups (Archives) qdn.public.qnxrtp.porting
1

Hi!
I was having some confusion when changing calls to qnx_spawn to the new
spawn* functions in QNX 6.1.
My two main concerns are:

  1. Where do I get documentation about the struct inheritance? There is some
    description of its fields in the spawn doc but it isnt complete…

  2. In the qnx_spawn function of yore I could set the node descriptor and
    the priority of the process that I was spawning…I havent figured out the
    way to do that in the new scenario…

any help, advice or random comments will be valuable.

thanks,
sanjeev

2

Ping?

I’m also porting from QNX 4 and need to be able to spawn programs on a
remote node.

Josh Hamacher
FAAC Incorporated

3

We really need this functionality. Any comment from QSSL or should this
be in a different newgroup?

Josh Hamacher wrote:

Ping?

I’m also porting from QNX 4 and need to be able to spawn programs on a
remote node.

Josh Hamacher
FAAC Incorporated

4

Dean Douthat <ddouthat@faac.com> wrote:

We really need this functionality. Any comment from QSSL or should this
be in a different newgroup?

in the inheritance structure, set the SPAWN_SETND flag and put the node descriptor
in the .nd field.

Josh Hamacher wrote:

Ping?

I’m also porting from QNX 4 and need to be able to spawn programs on a
remote node.

Josh Hamacher
FAAC Incorporated

–
cburgess@qnx.com

5

Ah. Thanks a lot. Is that in the documentation anywhere? I couldn’t
find it, and apparently Sanjeev (who started this thread) couldn’t
either. It might not be needed often, but it’s kinda important when it
is. :slight_smile:

Josh


Colin Burgess wrote:

Dean Douthat <> ddouthat@faac.com> > wrote:

We really need this functionality. Any comment from QSSL or should this
be in a different newgroup?


in the inheritance structure, set the SPAWN_SETND flag and put the node descriptor
in the .nd field.


Josh Hamacher wrote:


Ping?

I’m also porting from QNX 4 and need to be able to spawn programs on a
remote node.

Josh Hamacher
FAAC Incorporated

6

Josh Hamacher <hamacher@faac.com> wrote:

Ah. Thanks a lot. Is that in the documentation anywhere? I couldn’t
find it, and apparently Sanjeev (who started this thread) couldn’t
either. It might not be needed often, but it’s kinda important when it
is. > :slight_smile:

Josh

No, it appears to be omitted, probably because this only just
started working with 6.1.0 I believe.

–
cburgess@qnx.com

7

hi!
this gives a way to set nd, but what about priority? we could set this in
QNX4…is it now a member of inheritance?
and is there no documentation about inheritance, anywhere?
earth to QSSL?

:sunglasses:

thanks,
sanjeev

8

From /usr/include/spawn.h

typedef struct inheritance {
unsigned long flags;
pid_t pgroup; /* SPAWN_SETGROUP must be set in flags /
sigset_t sigmask; / SPAWN_SETSIGMASK must be set in flags /
sigset_t sigdefault; / SPAWN_SETSIGDEF must be set in flags /
sigset_t sigignore; / SPAWN_SETSIGIGN must be set in flags /
unsigned long stack_max; / SPAWN_SETSTACKMAX must be set in flags /
#if INT_BITS != 32
long policy; / SPAWN_EXPLICIT_SCHED must be set in flags /
#else
int policy; / SPAWN_EXPLICIT_SCHED must be set in flags /
#endif
_Uint32t nd; / SPAWN_SETND must be set in flags /
_Uint32t reserved;
struct sched_param param; / SPAWN_EXPLICIT_SCHED must be set in flags */
} spawn_inheritance_type;

the param member of the inheritance field can be used to set the priority.

Sanjeev Koppal <koppal@robotics.usc.edu> wrote:

hi!
this gives a way to set nd, but what about priority? we could set this in
QNX4…is it now a member of inheritance?
and is there no documentation about inheritance, anywhere?
earth to QSSL?

:sunglasses:

thanks,
sanjeev

–
cburgess@qnx.com

9

thanks…


sanjeev









Colin Burgess wrote:

From /usr/include/spawn.h

typedef struct inheritance {
unsigned long flags;
pid_t pgroup; /* SPAWN_SETGROUP must be set
in flags /
sigset_t sigmask; / SPAWN_SETSIGMASK must be
set in flags /
sigset_t sigdefault; / SPAWN_SETSIGDEF must be set
in flags /
sigset_t sigignore; / SPAWN_SETSIGIGN must be set
in flags /
unsigned long stack_max; / SPAWN_SETSTACKMAX must be
set in flags /
#if INT_BITS != 32
long policy; / SPAWN_EXPLICIT_SCHED must
be set in flags /
#else
int policy; / SPAWN_EXPLICIT_SCHED must
be set in flags /
#endif
_Uint32t nd; / SPAWN_SETND must be set in
flags /
_Uint32t reserved;
struct sched_param param; / SPAWN_EXPLICIT_SCHED must
be set in flags */
} spawn_inheritance_type;

the param member of the inheritance field can be used to set the priority.

Sanjeev Koppal <> koppal@robotics.usc.edu> > wrote:
hi!
this gives a way to set nd, but what about priority? we could set this in
QNX4…is it now a member of inheritance?
and is there no documentation about inheritance, anywhere?
earth to QSSL?

:sunglasses:

thanks,
sanjeev