| Title |
How can my application display the kind of information displayed by the sin utility in QNX4? |
| Ref. No. |
QNX.000009319 |
| Category(ies) |
Utilities, Development |
| Issue |
I'd like my application to display the kind of information displayed by the sin utility in QNX4. I could always parse the output of sin, but if sin changes down the road, my program will break. Is there a way to do this aside from using "sin"?
|
| Solution |
An application can access this information by calling the qnx_psinfo() function. For example, the following program uses qnx_psinfo() to display all the process IDs (PIDs), along with their associated program names, for the local node. When the program encounters a virtual process ID (VID), it queries the remote end for the PID and name of the remote application.
#include <stdio.h>
#include <stdlib.h>
#include <sys/psinfo.h>
#include <sys/osinfo.h>
#include <sys/sys/vc.h>
#include <sys/kernel.h>
#define FALSE 0
#define TRUE 1
struct _psinfo data;
struct _osinfo osdata;
void
main(int argc, char *argv[])
{
x09int tmp, isvid;
x09pid_t nid, tnid, vid, svid, pid=1;
x09tnid=nid=atoi(argv[1]);
x09if(nid == 0){ /* Get logical node number of local node */
x09x09qnx_osinfo(0,&osdata);
x09x09tnid=nid=osdata.nodename;
x09}
x09/** Connect to PROC on node to be queried **/
x09if((vid=qnx_vc_attach(nid,PROC_PID,1000,0)) == -1)
x09{
x09x09printf("Unable to link to node %dn",nid);
x09x09exit(-1);
x09}
x09printf("Processes on node %d:n",nid);
x09/**
x09x09** Display processes on target node as well as
x09x09** all processes that have VCs to that node
x09x09**/
x09printf("Nodex09PIDx09Name nn");
x09while((pid=qnx_psinfo(vid,pid,&data,0,0))!= -1)
x09{
x09x09isvid=FALSE;
x09x09if((data.flags & _PPF_VID)!= 0)
x09x09{ /** If vid, find origin and get process into **/
x09x09isvid=TRUE;
x09x09if ((syid=qnx_vc_attach(data.un.vproc.remote_nid,PROC_PID,1000,0))== -1)
x09x09{
x09x09x09printf("Unable to talk to node %dn",data.un.vproc.remote_nid);
x09x09x09exit(-1);
x09x09}
x09x09tnid=nid; /** remember orig. node **/
x09x09nid=data.un.vproc.remote_nid;
x09x09if((tmp=qnx_psinfo(svid,data.un.vproc.remote_pid,&data,0,0))== -1)
x09x09{
x09x09x09printf("Unable to get into on process %dn"
x09x09x09x09,data.un.vproc.remote_pid);
x09x09x09exit(-1);
x09x09}
x09x09qnx_vc_detach(svid); /** Don't build up VCs! **/
x09}
x09x09if((data.flags & _PPF_MID) == 0)
x09x09x09prinf("%s %4d %5dx09%sn",isvid?"vc":" "
x09x09x09x09,nid,data.pid,data.un.proc.name);
x09x09nid=tnid;
x09x09pid++;
x09}
}
The qnx_psinfo() function can return other information as well, see the /usr/include/sys/psinfo.h header file for all the members of the psinfo structure.
Also, look at qnx_osinfo() as it provides similar information. What it returns for information is located in the /usr/include/sys/osinfo.h header file.
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