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Full Discussion: Determine uniqueness of pid to name output files
Top Forums UNIX for Dummies Questions & Answers Determine uniqueness of pid to name output files Post 302796021 by vkumbhakarna on Thursday 18th of April 2013 06:19:42 PM
Old 04-18-2013
Determine uniqueness of pid to name output files
Hi,

We've a process on AIX UNIX server which is executed by multiple uses during a day. I wish to create a log file for every time the process is executed. I wish to know how unique are PID(s) on AIX UNIX servers if I were to name the log files with <date> and <PID>?

E.g. If I create my output files having the details such as
Code:
`date +%Y%m%d`_${$}_out.csv

With my limited understanding of UNIX and from what I've read on the forum https://www.unix.com/unix-advanced-expert-users/2896-obtaining-process-id-pid.html AIX system sequentially assigns a limited set of PIDs and re-utilizes them as and when processes get freed and slot is available for allocation by dispatcher.

Please suggest a suitable way to uniquely identify the process execution during the day. I am also considering adding datetime hh:mm:ss to the log name to uniquely identify the same E.g. change log file name to
Code:
 `date +%Y%m%d_%H%M%S`_${$}_out.csv

Thanks,
Last edited by vkumbhakarna; 04-18-2013 at 07:25 PM..
 

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LEARN ABOUT OSF1

getpgid

getpgid(2)							System Calls Manual							getpgid(2)

NAME

       getpgid - Gets process group ID

LIBRARY

       Standard C Library (libc.a)

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>
       pid_t getpgid(	   pid_t pid);

PARAMETERS

       Specifies the process ID of the target process; zero implies the calling process.

DESCRIPTION

       The  getpgid()  function returns the process group ID of the process specified by the process ID pid.  Specifying a pid of 0 (zero) returns
       the process group ID of the calling process.

RETURN VALUES

       The getpgid() function returns the process group ID of the process specified.  If there was an error, a value of -1 is returned	and  errno
       is set to indicate the error.

ERRORS

       If  any	of  the following conditions occurs, the getpgid() function sets errno to the corresponding value: The specified process is not in
       the same session as the calling process, and the calling process lacks sufficient privilege to read the specified  process.   As  released,
       Tru64 UNIX does not check the privilege.  No process has been found that has a process ID identical to that specified by the pid parameter.

RELATED INFORMATION

       Functions: exec(2), fork(2), setpgid(2) delim off

																	getpgid(2)
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