06-01-2012
Quiting running process without catching TRAP signal
Hi, I would like to ask, if is it possible to quit running loop in the script any other way than catching the trap signal. Ctrl-C ends only current running instance of process but not whole script. Any clues?
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
I ask this question since sometimes i run a time-consuming ftp in foreground and forget to use nohup ftp.sh & to put this work background and can still running after i log off.
Assume this ftp task have run 1 hour, and still 1 hour time to end,
i don't want to abort the ftp, first, i use ctrl+Z... (3 Replies)
Discussion started by: stevensxiao
3 Replies
2. Shell Programming and Scripting
Does anyone know how to program signals in fmli?
My fmli script goes in loop when the telnet session is closed. When I start the script from the prompt the issue do not happen. But when it is started by the login process it hags. That's why I want to program the SIGHUP to exit/finish the script.... (0 Replies)
Discussion started by: Marcos Brito
0 Replies
3. Programming
Hi,
Recently I was reading some c coding by some colleagues and I noticed that the above trend. They will create a pipe for the process then they will use the standard signal handler to capture a particular signal and write that signal to the pipe. On the other end, the process will read the... (7 Replies)
Discussion started by: joseph_ng
7 Replies
4. Shell Programming and Scripting
hey champs,
I have a process running.......i have to catch/trap the signal when the process is being interupted/killed (kill -9 pid) option......
how can i achieve the same thru my process........
let my process is a.sh and it supposed to take 13 mins to complete, but due to some problem ,... (15 Replies)
Discussion started by: manas_ranjan
15 Replies
5. Shell Programming and Scripting
hi ,
What is the trap signal for "ENTER key"? (4 Replies)
Discussion started by: Sreejith_VK
4 Replies
6. Programming
i am creating children processes using fork system call
every child i create goes to sleep for random time.
when child stops running how can i catch his signal and turminate the child (2 Replies)
Discussion started by: emil2006
2 Replies
7. UNIX for Dummies Questions & Answers
hi all ,
I want to execute a script on the user logout(using gnome environment).
Is ther any way to execute it through TRAP stmt? (2 Replies)
Discussion started by: harsha10
2 Replies
8. Programming
Hi!
I want to catch all signals that my program receives print their name and then execute the default handler.
Can you help me on that?
I've tried the following code:
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
void (*hnd)(int i);
char signals =
{
"SIGHUP",... (7 Replies)
Discussion started by: dark_knight
7 Replies
9. Shell Programming and Scripting
I just want to trap kill -9 signal issued by any of user from any terminal and just capture that user terminal who had raised this kill -9 command (1 Reply)
Discussion started by: puneet.goel
1 Replies
10. Shell Programming and Scripting
Hello all!
I'm writing a script that will catch when an outside process crashes (SIGHUP, right?) without having to loop into infinity.
With that in mind, I came across the trap utility and thought if could be used to monitor another process other than it's own. But from what I've read, I'm... (1 Reply)
Discussion started by: mashiox
1 Replies
trap(1) User Commands trap(1)
NAME
trap, onintr - shell built-in functions to respond to (hardware) signals
SYNOPSIS
sh
trap [ argument n [n2...]]
csh
onintr [-| label]
ksh
*trap [ arg sig [ sig2...]]
DESCRIPTION
sh
The trap command argument is to be read and executed when the shell receives numeric or symbolic signal(s) (n). (Note: argument is scanned
once when the trap is set and once when the trap is taken.) Trap commands are executed in order of signal number or corresponding symbolic
names. Any attempt to set a trap on a signal that was ignored on entry to the current shell is ineffective. An attempt to trap on signal 11
(memory fault) produces an error. If argument is absent all trap(s) n are reset to their original values. If argument is the null string
this signal is ignored by the shell and by the commands it invokes. If n is 0 the command argument is executed on exit from the shell. The
trap command with no arguments prints a list of commands associated with each signal number.
csh
onintr controls the action of the shell on interrupts. With no arguments, onintr restores the default action of the shell on interrupts.
(The shell terminates shell scripts and returns to the terminal command input level). With the - argument, the shell ignores all inter-
rupts. With a label argument, the shell executes a goto label when an interrupt is received or a child process terminates because it was
interrupted.
ksh
trap uses arg as a command to be read and executed when the shell receives signal(s) sig. (Note that arg is scanned once when the trap is
set and once when the trap is taken.) Each sig can be given as a number or as the name of the signal. trap commands are executed in order
of signal number. Any attempt to set a trap on a signal that was ignored on entry to the current shell is ineffective. If arg is omitted
or is -, then the trap(s) for each sig are reset to their original values. If arg is the null (the empty string, e.g., "" ) string then
this signal is ignored by the shell and by the commands it invokes. If sig is ERR then arg will be executed whenever a command has a non-
zero exit status. If sig is DEBUG then arg will be executed after each command. If sig is 0 or EXIT for a trap set outside any function
then the command arg is executed on exit from the shell. The trap command with no arguments prints a list of commands associated with each
signal number.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a vari-
able assignment. This means that tilde substitution is performed after the = sign and word splitting and file name generation are not
performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
csh(1), exit(1), ksh(1), sh(1), attributes(5)
SunOS 5.10 23 Oct 1994 trap(1)