topic Re: retrieve absolute path from pid in Operating System - HP-UX

retrieve absolute path from pid

Senthilprakash_1 — Fri, 15 Oct 2004 02:29:19 GMT

hi,

I have the pid of the process. Using this pid i should retrieve the absolute path name of the executable. I tried pstat_getproc(), but it gives only the basename of the executable. I need the full path. Is there any system call available in HP-UX to do that or can i do this using scripting?

Thanks,
Prakash.

Re: retrieve absolute path from pid

Robert-Jan Goossens — Fri, 15 Oct 2004 02:45:17 GMT

Hi Prakash,

# UNIX95= ps -e -o ruser,pid,vsz,args

Regards,
Robert-Jan

Re: retrieve absolute path from pid

Franky_1 — Fri, 15 Oct 2004 02:50:22 GMT

Hi,

you can user the "UNIX95" option

eg

UNIX95= ps -eo time,vsz,pid,args

(see "columns" from man ps for more options)
and be aware of the " " before ps
This should give you what you want

Regards

Franky

Re: retrieve absolute path from pid

Bharat Katkar — Fri, 15 Oct 2004 02:55:58 GMT

HI Prakash,
How about this one.

# PIDNO=xxxx
# ps -ef | grep $PIDNO | grep -v grep | awk '{ print $9 }'

Hope that helps.
Regards,

Re: retrieve absolute path from pid

Senthilprakash_1 — Fri, 15 Oct 2004 03:02:08 GMT

hi,

I invoke a executable ./a.out in /tmp/one.
Now i am in some different directory and try using the script provided i still get as
./a.out and not as /tmp/one/a.out.

Prakash

Re: retrieve absolute path from pid

Robert-Jan Goossens — Fri, 15 Oct 2004 03:21:47 GMT

you wont, the process is being started as ./a.out ( no full path )

if you start is as # /tmp/one/a.out (without the .)the full path wil be visible in the ps list.

Re: retrieve absolute path from pid

Muthukumar_5 — Fri, 15 Oct 2004 04:16:53 GMT

I hope you are expecting full path and execution of a process there. We can do in linux using /proc filesystem. Every process ID contains exe part which gives link to exact execution path there.

We can not get it using ps command there. We can get basename of execution, if we execute them as only that command. We can full path name when we does with full path name.

You can go to glance tool, to know more about a process there. I am not sure which will give or not.

HTH.

Re: retrieve absolute path from pid

Petr Simik_1 — Fri, 15 Oct 2004 04:31:48 GMT

You cann't get PATH from ps everytime.

PATH output from ps is limited to 80 characters. If the PATH is longer you don't get it.

I am curious if anybody know how to get full PATH.

Re: retrieve absolute path from pid

Bill Hassell — Fri, 15 Oct 2004 07:18:38 GMT

The full path is not stored in the process table unless the process is started with a full path (ie, starts with /). You can see the full path and the parameters (very common request for Java stuff) by using -x as in:

ps -efx

NOTE: -x is *only* available for patched versions of ps (11.00 and 11i only).

Re: retrieve absolute path from pid

Senthilprakash_1 — Fri, 15 Oct 2004 07:24:49 GMT

If I wont be able to retrieve the full pathname using "ps" then is there any system call and work around which will get me abolsute path using pid.

Thanks,
Prakash.

Re: retrieve absolute path from pid

RAC_1 — Fri, 15 Oct 2004 07:27:38 GMT

Finally Bill talked about option -x for ps command. You need to have ps patch for it. Else you can use UNIX95 command. Also as explained earlier by few memebers, if you started the progrm with absolute path, you will get it, else not.

ps -efx|grep "xyz"
UNIX95= ps -ef -o "ruser,args,pid" | grep "xyz"

Anil

Re: retrieve absolute path from pid

Patrick Wallek — Fri, 15 Oct 2004 08:14:18 GMT

Bill said it all. The full path is only stored if the process is started that way.

Re: retrieve absolute path from pid

ranganath ramachandra — Fri, 15 Oct 2004 08:48:45 GMT

i got the filename from the program below, on 11.00, 11.11 and 11.23.

---
#include
#include

int main (int argc, char *argv[])
{
struct pst_vm_status vmstat;
struct pst_filedetails psfdetails;
char name[1024];
int ret;
int pid = atoi(argv[1]);

/* last parameter to getprocvm is 1 */
/* because it worked :P will confirm */
/* with vm folks later */
if ((ret = pstat_getprocvm(&vmstat, sizeof(vmstat), pid, 1)) <0) {
perror("pstat_getprocvm");
exit(10);
}

if ((ret=pstat_getfiledetails(&psfdetails, sizeof(psfdetails),&(vmstat.pst_fid))) <0) {
perror("pstat_getfiledetails");
exit(20);
}

// printf ("device: %d, inode: %u\n", psfdetails.psfd_rdev, psfdetails.psfd_ino);

if ((ret=pstat_getpathname(name, 256, &(vmstat.pst_fid))) <0) {
perror("pstat_getpathname");
exit(30);
}

puts(name);
}
---

Re: retrieve absolute path from pid

ranganath ramachandra — Fri, 15 Oct 2004 08:49:42 GMT

oops i meant to say 11.11 and 11.23 but not on 11.00.

Re: retrieve absolute path from pid

Senthilprakash_1 — Fri, 15 Oct 2004 08:51:27 GMT

Thanks, the program works :)

Re: retrieve absolute path from pid

Prashant Zanwar_4 — Fri, 15 Oct 2004 09:35:37 GMT

This is to track down the childs.

Hope it helps..

/bin/ps -ef | awk -v v= ' ($3 == v) { print $2 } '

Thanks
Prashant