Hi all,

I am a newbie to unix programming using C..
So i would like to have a few simple C programs to start off with..
I wanted programs on learning ,
abort,kill and raise,alarm and pause,
I would also like to know how to use the vfork()
It would be really great if i can have these programs


Thanks

Play around with 'signal' and 'alarm'. If you're a beginner there's no way you'll understand the actual programs that make use of these. It's better to practice by building your own toy program which does nothing useful but you can make quick changes to make sure you understand what's going on.

man sigaction

Just create signal handlers that print something out as you send different signals (SIGUSR1/2, SIGINT, SIGTERM, SIGPIPE ... etc etc etc).

For 'alarm', you just have to handle 'SIGALRM'.

For 'pause' - similar to 'alarm' - once you have actually implemented signal handlers, it's easy to use.

For 'vfork' do the same - write a small program that does nothing useful but prints out statements to show you that you got things right and can tell the difference between the child and parent process.

ok ,i will try..
But if you could point me out to some starting material on the web,it would be great

Thanks

Here's a good tutorial: http://www.cs.cf.ac.uk/Dave/C/, specifically http://www.cs.cf.ac.uk/Dave/C/node24...00000000000000

google is your friend...

This free downloadable book may be what you're looking for. Follow the download link to download it as a PDF per chapter and the example code.

What you are asking about specifically is well covered here.

Heres a little sample code:

void print_signal_number(int sig) // not in all_and_everything.h
{
fprintf(stderr,"received sig = %d\n",sig);
}

void init_to_trap_and_print_all_signal_numbers()
{

for(int i=1; i<32; i++) signal(i, print_signal_number);
}

///////////////////////////////
{
.......
quir__signal( 17, quir__signal__nothing); // needed to stop death of child from killing parent
}
int pid = fork();
if ( pid == -1) return pid; // pid= -1 ==> fork failed
if ( pid != 0 ) return pid; // pid= 0 ==> I am parent

.... action of chilkd
}

at the terminal:
man 3 function