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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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SETPGID(2)						      BSD System Calls Manual							SETPGID(2)

NAME
setpgid, setpgrp -- set process group LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int setpgid(pid_t pid, pid_t pgrp); int setpgrp(pid_t pid, pid_t pgrp); DESCRIPTION
setpgid() sets the process group of the specified process pid to the specified pgrp. If pid is zero, then the call applies to the current process. If pgrp is zero, then the process id of the process specified by pid is used instead. If the invoker is not the super-user, then the affected process must have the same effective user-id as the invoker or be a descendant of the invoking process. RETURN VALUES
setpgid() returns 0 when the operation was successful. If the request failed, -1 is returned and the global variable errno indicates the reason. ERRORS
setpgid() will fail and the process group will not be altered if: [EACCES] The value of the pid argument matches the process ID of a child process of the calling process, and the child process has successfully executed one of the exec functions. [EINVAL] The value of the pgrp argument is less than zero. [EPERM] The effective user ID of the requested process is different from that of the caller and the process is not a descendant of the calling process. [ESRCH] The value of the pid argument does not match the process ID of the calling process or of a child process of the calling process. SEE ALSO
getpgrp(2) STANDARDS
The setpgid() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1''). COMPATIBILITY
setpgrp() is identical to setpgid(), and is retained for calling convention compatibility with historical versions of BSD. BSD
December 18, 2003 BSD
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