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Hang a Process

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Operating Systems Linux SuSE Hang a Process
# 1  
Old 06-29-2004
Hang a Process
this may be something trivial to many of you, but is there a way to purposely cause a process to hang?
# 2  
Old 06-29-2004
Depends on how you define "hang".... how about
kill -STOP $pid
# 3  
Old 06-29-2004
"hanging" is a process that is still running, but wouldn't accept any signal and still consuming resources. I know this may be caused by the parent process not waiting for the child process to send its info before the parent is shutting down. But that is usually is caused by accident. I want to write a program/script that would intentionally cause a specified process to hang.

thank you much for your reply!
# 4  
Old 06-30-2004
Quote:
Originally posted by Driver
You can attach to it using a debugger.

Code:
/home/stdnrw [0]> cat new.c
int
main(void) {
        sleep(10);
        puts("hello");
}
/home/stdnrw [0]> cc new.c -o new
/home/stdnrw [0]> ./new &
[1] 2468
/home/stdnrw [0]> gdb new 2468
GNU gdb 5.3
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i586-suse-linux"...
Attaching to program: /home/stdnrw/new, process 2468
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
0x400d6145 in nanosleep () from /lib/libc.so.6
(gdb) detach
Detaching from program: /home/stdnrw/new, process 2468
(gdb) hello

[1]    Exit 6                        ./new

(gdb)

I'm not sure I understand what you mean. Could you please further explain? Thanks.
# 5  
Old 06-30-2004
I sincerely apologize for my confusion in regard to children processes. I'm new to this and is still learning...I tried to read too many resources and then ended up getting confused. Smilie

Thank you so much for your suggestion and explanation, it makes more sense to me now. Smilie
# 6  
Old 06-30-2004
Quote:
Originally posted by Driver

int
main(void) {
sleep(10);
puts("hello");
}
Driver, i compiled this code and got "error 1705: Function prototypes are an ANSI feature." what is this mean?

Thanks.
# 7  
Old 06-30-2004
Quote:
Originally posted by laila63
Driver, i compiled this code and got "error 1705: Function prototypes are an ANSI feature." what is this mean?

Thanks.
i got it, was confused with the syntax of C & C++. Fixed it and it works like a charm Smilie Again, thank you so much for your help.
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