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Full Discussion: Help with Signals
Top Forums UNIX for Advanced & Expert Users Help with Signals Post 302843632 by Praty.27 on Wednesday 14th of August 2013 08:33:48 AM
Old 08-14-2013
Question Help with Signals
Hi All,

The problem statement is as below:

Problem: A process (exe) is getting executed in background. The output of this process is getting logged in a file. After successfully running for some time the process gets terminated. In the log file following is present:

^M[7m Interrupt ^M[27m

Please note that this does not happen all the time and can be taken as once in a blue moon scenario.

if 7 and 27 are signals then 7 is for abort and 27 is for sigttin (used kill -l).

It would be good if some pointers can be given around the same. Need to know how these signals are getting generated and why they do not appear all the time. Any reference material would also help. Thank you
 

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LEARN ABOUT DEBIAN

kill

KILL(1) 							   User Commands							   KILL(1)

NAME

       kill - send a signal to a process

SYNOPSIS

       kill [options] <pid> [...]

DESCRIPTION

       The  default  signal  for kill is TERM.	Use -l or -L to list available signals.  Particularly useful signals include HUP, INT, KILL, STOP,
       CONT, and 0.  Alternate signals may be specified in three ways: -9, -SIGKILL or -KILL.  Negative PID values may be  used  to  choose  whole
       process	groups;  see  the  PGID  column  in ps command output.	A PID of -1 is special; it indicates all processes except the kill process
       itself and init.

OPTIONS

       <pid> [...]
	      Send signal to every <pid> listed.

       -<signal>
       -s <signal>
       --signal <signal>
	      Specify the signal to be sent.  The signal can be specified by using name or number.  The behavior of signals is explained  in  sig-
	      nal(7) manual page.

       -l, --list [signal]
	      List signal names.  This option has optional argument, which will convert signal number to signal name, or other way round.

       -L, --table
	      List signal names in a nice table.

       NOTES  Your shell (command line interpreter) may have a built-in kill command.  You may need to run the command described here as /bin/kill
	      to solve the conflict.

EXAMPLES

       kill -9 -1
	      Kill all processes you can kill.

       kill -l 11
	      Translate number 11 into a signal name.

       kill -L
	      List the available signal choices in a nice table.

       kill 123 543 2341 3453
	      Send the default signal, SIGTERM, to all those processes.

SEE ALSO

       kill(2), killall(1), nice(1), pkill(1), renice(1), signal(7), skill(1)

STANDARDS

       This command meets appropriate standards. The -L flag is Linux-specific.

AUTHOR

       Albert Cahalan <albert@users.sf.net> wrote kill in 1999 to replace a bsdutils one that was not standards  compliant.   The  util-linux  one
       might also work correctly.

REPORTING BUGS

       Please send bug reports to <procps@freelists.org>

procps-ng							   October 2011 							   KILL(1)
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