Getting Process Arguments QNX 4.25

QNX DEVELOPERS General Programming
1

Good day,

People I’m having problems getting process arguments; It’s not as simple as it seems to be.

I’m trying to do an application able to slay and rise programs and apps (Some kind of Task Manager), but due to a program could be raised many times passing different arguments, it’s not enough having the PID, I also need to know the arguments just to kill the right one and avoid problems.

I’m using C. Function qnx_psinfo gives me some important info but not enough to get a process arguments or parameters. Using qnx6, I found the way to do this, but now in QNX 4.25 I do not know how to do that and it kills me.

Does anyone know how to do THISSS pleaseee???

2

use popen to run “sin ar” and parse the return data

3

In qnx4 it is possible to use qnx_psinfo() and __qnx_debug_xfer() to read arguments directly from memory of a process.
However the qnx_debug_xfer has a “feature” which enables it write into read-only mapped memory owned by another process.
This example reads the arguments inefficiently, it could be optimized to read blocks.

[code]qnx_psinfo(PROC_PID, pid, &psdata, 0, NULL);

magic_off = psdata.magic_off + offsetof(struct _magic, cmd);
magic_sel = psdata.magic_sel;

__qnx_debug_xfer(PROC_PID, psdata.pid, _DEBUG_MEM_RD, &cmd_magic_ptr, sizeof(void *), magic_off, magic_sel);

__qnx_debug_xfer(PROC_PID, psdata.pid, _DEBUG_MEM_RD, buffer, sizeof(struct _proc_spawn) - 1, (unsigned long)cmd_magic_ptr, magic_sel)

proc_spawn = (struct _proc_spawn *)buffer;
args_parsed = 0;
p = buffer + sizeof(struct _proc_spawn) - 1;

for (i = 0; i < MAX_SIZE - sizeof(struct _proc_spawn) - 1 - 1; ++i, ++p)
{
if (__qnx_debug_xfer(PROC_PID, psdata.pid, _DEBUG_MEM_RD, p, 1, (unsigned long)cmd_magic_ptr + sizeof(struct _proc_spawn) - 1 + i, magic_sel) == -1)
return 0;

if (*p == 0)
	if (args_parsed++ == proc_spawn->argc)
		break;

}

p = proc_spawn->data;

for (i = 0; i < proc_spawn->argc + 1; ++i)
{
printf("’%s’\n", p);
p += strlen(p) + 1;
}[/code]

4

Mezek i have to say:
It didn’t work
Even when it’s to clean the way you suggest i wasn’t able to make it work couldn’t find the function __qnx_debug_xfer(), by the other hand i was able to do it using ianc method even when it’s not to clean, but it works.

Mezek could you post the libraries and .h files i need to make it work?

5

Hello,
It works for me just fine.

Did you search your development machine include files for __qnx_debug_xfer ?
On mine its in /usr/include/sys/debug.h

And by the way “sin ar” will return incomplete args if they are longer than about 500 Bytes.
(Which is unacceptable in our production environment.)