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Top Forums UNIX for Advanced & Expert Users retrieve process state programatically Post 302388724 by Andre_Merzky on Thursday 21st of January 2010 08:28:15 AM
Old 01-21-2010
Question retrieve process state programatically

Assume I spawn a process on (csh) command line, like

Code:
> du -a / >& /dev/null &

which creates a process with id 1234. Now, I can suspend/resume that process with

Code:
> kill -STOP 1234
> kill -CONT 1234

and can query the process state via 'jobs' or 'ps. How can I though query that state programatically (UNIX/POSIX system, no /proc/ available)?

The only call closest to the problem seems waitpid(), which can use WUNTRACED to get notifications on some signals, including SIGSTOP. That seems to work only for processes spawned within the same application - so I would not be able to write a tool which, for the example above, works like

Code:
> check_proc_state -p 1234
 1234 is Running

Another option is to do something like

Code:
FILE* fd = popen ("ps -ewwo pid=,uid=,state=,command=", "r");

and to grep the output - but ps output is not well standardized (well, it actually is, see ps, but the various implementations do not necessarily adhere to the spec), and also this seems a very cumbersome way to do that. Not to speak of performance...

Any better ideas? The solution ideally should work on MacOS, BSD, Linux, and AIX.

Thanks, Andre.


PS.: yes, I grep'ed the forum: huge amount of related posts, and I may well have missed relevant discussions in the noise. My apologies, and thanks for any pointers...

Last edited by Andre_Merzky; 01-21-2010 at 09:46 AM.. Reason: code tags, please...
 

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IRSEND(1)							   User Commands							 IRSEND(1)

NAME
irsend - basic LIRC program to send infra-red commands SYNOPSIS
irsend [options] DIRECTIVE REMOTE CODE [CODE...] DESCRIPTION
Asks the lircd daemon to send one or more CIR (Consumer Infra-Red) commands. This is intended for remote control of electronic devices such as TV boxes, HiFi sets, etc. DIRECTIVE can be: SEND_ONCE - send CODE [CODE ...] once SEND_START - start repeating CODE SEND_STOP - stop repeating CODE LIST - list configured remote items SET_TRANSMITTERS - set transmitters NUM [NUM ...] SIMULATE - simulate IR event REMOTE is the name of a remote, as described in the lircd configuration file. CODE is the name of a remote control key of REMOTE, as it appears in the lircd configuration file. NUM is the transmitter number of the hardware device. For the LIST DIRECTIVE, REMOTE and/or CODE can be empty: LIST "" "" - list all configured remote names LIST REMOTE "" - list all codes of REMOTE LIST REMOTE CODE - list only CODE of REMOTE The SIMULATE command only works if it has been explicitly enabled in lircd. -h --help display usage summary -v --version display version -d --device use given lircd socket [/var/run/lirc/lircd] -a --address=host[:port] connect to lircd at this address -# --count=n send command n times EXAMPLES
irsend LIST DenonTuner "" irsend SEND_ONCE DenonTuner PROG-SCAN irsend SEND_ONCE OnkyoAmpli VOL-UP VOL-UP VOL-UP VOL-UP irsend SEND_START OnkyoAmpli VOL-DOWN ; sleep 3 irsend SEND_STOP OnkyoAmpli VOL-DOWN irsend SET_TRANSMITTERS 1 irsend SET_TRANSMITTERS 1 3 4 irsend SIMULATE "0000000000000476 00 OK TECHNISAT_ST3004S" FILES
/etc/lirc/lircd.conf Default lircd configuration file. It should contain all the remotes, their infra-red codes and the corresponding timing and wave- form details. DIAGNOSTICS
If lircd is not running (or /var/run/lirc/lircd lacks write permissions) irsend aborts with the following diagnostics: "irsend: could not connect to socket" "irsend: Connection refused" (or "Permission denied"). SEE ALSO
The documentation for lirc is maintained as html pages. They are located under html/ in the documentation directory. lircd(8), mode2(1), smode2(1), xmode2(1), irrecord(1), irw(1), http://www.lirc.org. irsend 0.9.0-pre1 October 2010 IRSEND(1)
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