Signal Processing in unix Post: 302407047

7 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Signal Processing

Hello, Can any body give example of using Unix Signals. What I want to do is I am running a sql query in a shell script I want, if sql query exceed the defined no. of seconds limit, then I would like to kill the process. I know this can be done thru Unix Signal Handling but I do not know...

2. UNIX for Advanced & Expert Users

Help required regarding Unix Signal

It is required to trap the signal send to a daemon process before rebooting a unix server. Suppose a script abc.ksh is running in the server as daemon. Before rebooting the server, the unix admin kills all the daemon processes. It is not known to me how admin kills the processes; I mean by which...

3. Shell Programming and Scripting

Script Signal Processing

I am trying to develop a script that will properly handle kill signals particularly kill -2. I have program (_progres) that properly receives the signal if I run it from the command line directly: _progres -T /tmp -p /home/mejones/signal.p -b 2>&1 & If I try to put it in a script (i.e....

4. Programming

Signal processing

We have written a deamon which have many threads. We are registering for the SIGTERM and trying to close main thread in this signal handling. Actually these are running on Mac OS X ( BSD unix). When we are unloading the deamon with command launchctl, it's sending SIGTERM signal to our process...

5. Programming

alarm signal processing

I'm writing a function right now, and I want to set an alarm to avoid a timeout, here's the general idea of my code: int amt = -2; alarm(10); amt = read(fd, &t->buf, TASKBUFSIZ - tailpos); //do a read when the alarm goes off, i want to check the value of "amt" ...

6. Programming

UNIX signal problem

Hi all, Sorry about the title,at first i decided to ask a problem about the signal mechanism,however,i'm now figured it out.Sorry to forget modify the title:wall:.I had a small problem that if i use the code which is commented,the code would get a segment fault,while the above code NOT.what's...

7. Shell Programming and Scripting

Continue Processing after a signal is caught

Is it possible to continue after signal is caught and control goes to function specified in the trap statement?

LEARN ABOUT OSF1

ppmtopgm

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)