Man pages sections > man8 > readproctitle

readproctitle - maintains an automatically rotated log in memory for inspection

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 apply 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)
 

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