readproctitle(8) - man - phpMan

readproctitle(8)                       System Manager's Manual                      readproctitle(8)



NAME
       readproctitle - maintains an automatically rotated log in memory for inspection by ps(1).

       readproctitle is available in daemontools 0.75 and above.

SYNOPSIS
       readproctitle L D

DESCRIPTION
       L consists of any number of arguments.  D is one argument consisting of at least five dots.

       readproctitle  reads  data into the end of D, shifting D to the left to make room. This means
       that the most recent data is visible to process-listing tools such as  ps(1).   readproctitle
       always leaves three dots at the left of D.

       For example, if

        readproctitle io errors: ....................

       reads the data

        fatal error xyz
        warning abc

       then its command-line arguments change to

        readproctitle io errors: ... xyz!warning abc!

       with a newline character in place of each !. Process-listing tools typically show the newline
       character as ? or \n.

       readproctitle exits when it reaches the end of input.

       Beware that most implementations of ps(1) have small argument-length limits. These limits ap‐
       ply  to  the  total length of readproctitle L D.  I have not seen a system with a limit below
       512 bytes.

SEE ALSO
       supervise(8), svc(8), svok(8), svstat(8), svscanboot(8), svscan(8),  fghack(8),  pgrphack(8),
       multilog(8),  tai64n(8), tai64nlocal(8), setuidgid(8), envuidgid(8), envdir(8), softlimit(8),
       setlock(8), ps(1)

        http://cr.yp.to/daemontools.html
        http://cr.yp.to/slashcommand.html



                                                                                    readproctitle(8)