08-05-2009
how to discard instruction from previous signal
hello everyone,
I'm having a problem doing signal handling so I post this thread to see if I could get help.
I want asynchronous signal handling, that means when I'm processing a signal (signal 1), if the same signal comes (signal 2) that signal (signal 2) shall be processed; and moreover, the remain instructions of previous signal handler (signal 1) shall not be executed (or do nothing).
My problem is that I cannot discard remaining instructions from a previous signal.
Can anyone give me some hints how to solve this?
Best regards,
nvhoang
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi,
this is my script to make a choice between 4 :
clear
echo " choose a profile and enter a number"
echo
echo " 1- oraSTT "
echo
echo " 2- appSTT "
echo... (3 Replies)
Discussion started by: big123456
3 Replies
2. Solaris
Hi all,
make_lofs /.cdrom/<something>/<something> 1
what does this instruction mean?
Note:both the "something" are obviously different .
I would like to know what that 1 means, the rest of the instruction is clear!!
Thanks (6 Replies)
Discussion started by: wrapster
6 Replies
3. Shell Programming and Scripting
Hi,
I'd get fields like
unix_linux_form_yyyyddmmhhmi.file.txt
shell_programming_and_scripting.txt
so on...
and want them as below
unix_linux_form
shell_programming_and
I could remove everything after a '.' as below
echo $field | sed 's/\..*//'
but how to remove... (14 Replies)
Discussion started by: dips_ag
14 Replies
4. Shell Programming and Scripting
Dear shell experts,
I spent last few days porting ksh script from ksh88/SunOS to ksh93/Linux.
Basically, things are going well and I do not have too much troubles porting ks88 script to ksh93, but I stuck on one item. It's about sending and handling the signal.
I found two similar... (8 Replies)
Discussion started by: bzk
8 Replies
5. Shell Programming and Scripting
Hi all,
I'd like to search a file for the first occurence of the phrase "PLASTICS THAT EXPIRE" and then discard all the lines that came before it. Output the remainder to a new file. Operating system is hp-ux. I've searched for usual awk and sed one liners but can't find a solution.
Thank... (4 Replies)
Discussion started by: Scottie1954
4 Replies
6. Shell Programming and Scripting
I want to remove commands having no output. In below text file.
bash-3.2$ cat abc_do_it.txt
grpg10so>show trunk group all status
grpg11so>show trunk group all status
grpg12so>show trunk group all status
GCPKNYAIGT73IMO 1440 1345 0 0 94 0 0 INSERVICE 93% 0%... (4 Replies)
Discussion started by: Raza Ali
4 Replies
7. Shell Programming and Scripting
Pleas I want answer to this question? Pleas help me
A system administrator suspects that there is an attack on his machine; he needs to make a backup of the files to check when they have been modified. For this purpose he uses the "cp -r" instruction to copy the root directory. What is the... (1 Reply)
Discussion started by: tamer11007
1 Replies
8. Shell Programming and Scripting
Hi,
I'd like to do an operation on text with a format like this
this line shall be numbered
this line shall not be numbered
this line shall also be numbered
this line shall not not be numbered
And I want an output like this
1 this line shall be numbered
this line... (6 Replies)
Discussion started by: jeppe83
6 Replies
9. Shell Programming and Scripting
I have the file:
s3_T0(2) Pos "1" "2"
s1_T1(2) Pos "1" "2"
---
0 0
1 0
0 1
1 1
---
1 2 "tau0"
1 2 "h10"
I want to patternmatch on ---
and get only the third part i.e.
1 2 "tau0"
1 2 "h10"
I wanted to start simple but even something like (5 Replies)
Discussion started by: eagle_fly
5 Replies
10. UNIX for Dummies Questions & Answers
Hi guys !
I generated the power set of the set S={a,b,c} using crunch:
crunch 1 3 abc
and get the 39 possible subsets:
a
b
c
aa
ab
ac
ba
bb
bc
ca
cb
cc
… (2 Replies)
Discussion started by: beca123456
2 Replies
pause(2) System Calls Manual pause(2)
NAME
pause - suspend process until signal
SYNOPSIS
DESCRIPTION
suspends the calling process until it receives a signal. The signal must be one that is not currently set to be ignored or blocked
(masked) by the calling process.
If the signal causes termination of the calling process, does not return.
If the signal is by the calling process and control is returned from the signal-catching function (see signal(5)), the calling process
resumes execution from the point of suspension; with a return value of -1 from and set to
APPLICATION USAGE
Threads Considerations
Signal dispositions (such as catch/default/ignore) are shared by all threads in the process and blocked signal masks are maintained by each
thread. Therefore, the signals being waited for should not be ignored by the process or blocked by the calling thread.
will suspend only the calling thread until it receives a signal.
If other threads in the process do not block the signal, the signal may be delivered to another thread in the process and the thread in may
continue waiting. For this reason, the use of is recommended instead of for multi-threaded applications.
For more information regarding signals and threads, refer to signal(5).
SEE ALSO
alarm(2), kill(2), sigwait(2), wait(2), signal(5).
STANDARDS CONFORMANCE
pause(2)