My "Bread and Butter" Process Keep Alive Perl Script.... Post: 302883288

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Top Forums UNIX for Beginners Questions & Answers Answers to Frequently Asked Questions Tips and Tutorials My "Bread and Butter" Process Keep Alive Perl Script.... Post 302883288 by MadeInGermany on Monday 13th of January 2014 05:33:45 AM

01-13-2014

Registered User

Now the haute cuisine:
a shell daemon that polls /proc every 30 seconds:

Code:

#!/bin/bash

# name of the daemon to watch
pname=named
pstart=/usr/sbin/$pname

# this script
me=${0##*/}
# e.g. me=named_watcher.sh

export PATH=/bin:/usr/bin:/usr/sbin:/sbin

# sh sends SIGHUP on exit, we need to continue
trap 'echo "SIGHUP captured"' HUP

# no interactions, log all output and errors
mkdir -p /var/log
exec </dev/null >/var/log/${me%.*}.log 2>&1

# Solaris needs -z option
zopt=`{ zonename; } 2>/dev/null`
zopt=${zopt:+"-z $zopt"}

echo "$me started with pid $$"
sleep 3
# initiate the pid variables
pid=`pgrep $zopt -x $pname`
[ -n "$pid" ] || exec echo "no $pname process - exiting"
echo "$me watching $pname[$pid]"

# endless loop
while :
do
 sleep 30
 if [ \! -d /proc/$pid ]; then
  echo "`date` $me $pid is gone!"
  sleep 1
  echo "starting $pname"
  date
  eval $pstart
  sleep 3
  # renew the pid variables
  pid=`pgrep $zopt -x $pname`
  [ -n "$pid" ] || exec echo "no $pname process - exiting"
  echo "$me watching $pname[$pid]"
 fi
done

The script should be background-started (with &) in the start section of the process (here: named) init script, *after* the process is started.
And killed in the stop section of the process start script, *before* the process is killed.

Last edited by MadeInGermany; 01-13-2014 at 03:46 PM..

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LEARN ABOUT CENTOS

glgetprogrampipeline

GLGETPROGRAMPIPELINE(3G)					   OpenGL Manual					  GLGETPROGRAMPIPELINE(3G)

NAME

       glGetProgramPipeline - retrieve properties of a program pipeline object

C SPECIFICATION

       void glGetProgramPipelineiv(GLuint pipeline, GLenum pname, GLint *params);

PARAMETERS

       pipeline
	   Specifies the name of a program pipeline object whose parameter retrieve.

       pname
	   Specifies the name of the parameter to retrieve.

       params
	   Specifies the address of a variable into which will be written the value or values of pname for pipeline.

DESCRIPTION

       glGetProgramPipelineiv retrieves the value of a property of the program pipeline object pipeline.  pname specifies the name of the
       parameter whose value to retrieve. The value of the parameter is written to the variable whose address is given by params.

       If pname is GL_ACTIVE_PROGRAM, the name of the active program object of the program pipeline object is returned in params.

       If pname is GL_VERTEX_SHADER, the name of the current program object for the vertex shader type of the program pipeline object is returned
       in params.

       If pname is GL_TESS_CONTROL_SHADER, the name of the current program object for the tessellation control shader type of the program pipeline
       object is returned in params.

       If pname is GL_TESS_EVALUATION_SHADER, the name of the current program object for the tessellation evaluation shader type of the program
       pipeline object is returned in params.

       If pname is GL_GEOMETRY_SHADER, the name of the current program object for the geometry shader type of the program pipeline object is
       returned in params.

       If pname is GL_FRAGMENT_SHADER, the name of the current program object for the fragment shader type of the program pipeline object is
       returned in params.

       If pname is GL_INFO_LOG_LENGTH, the length of the info log, including the null terminator, is returned in params. If there is no info log,
       zero is returned.

ERRORS

       GL_INVALID_OPERATION is generated if pipeline is not zero or a name previously returned from a call to glGenProgramPipelines() or if such a
       name has been deleted by a call to glDeleteProgramPipelines().

       GL_INVALID_ENUM is generated if pname is not one of the accepted values.

SEE ALSO

       glGetProgramPipelines(), glBindProgramPipeline(), glDeleteProgramPipelines()

COPYRIGHT

       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014						  GLGETPROGRAMPIPELINE(3G)