I use FreeBSD,and use signal,like follows:
signal(SIGHUP,sig_hup);
signal(SIGIO,sig_io);
when I run call following code,it can run,but I find a puzzled question,it should print some information,such as printf("execute main()") will print execute main(),but in fact,printf fuction print none!!! Why printf function do not go work?
Another question:
I use a udp client to send message to this code,this code can run well,when upd client quit,this code should call sig_hup(),but when the client quit,this code don't call sig_hup(),why? How to correct my code to call sig_hup() when client quit?
I'm not sure ( I didn't look closely at the code), but calling an IO function while handling an IO signal might be a problem. Also, when printing within signals, it's a good idea to call flush().
Also, why would you expect the program to call SIGHUP on itself when exiting? That's only the case if you're connected to a TTY which is closed on you.
I'm not sure ( I didn't look closely at the code), but calling an IO function while handling an IO signal might be a problem. Also, when printing within signals, it's a good idea to call flush().
One could also print to the stderr stream instead of stdout, since stderr never needs flush.
Hello:
I can't get equivalence classes to work in globs or when passing them to tr. If I understood correctly, matches e, é, è, ê, etc. But when using them with utilities like tr they don't work. Here's an example found in the POSIX standard:
I decided to create the aforementioned files in... (9 Replies)
Hello all!
I have problem in hp-ux 11.11 in awk
I want to grep sar -d 2 1 only 3 column, but have error in awk in hp-ux 11.11
Example:
#echo 123 234 | awk '{print $2}'
123 234
The situattions in commands bdf | awk {print $5}' some...
In hp-ux 11.31 - OK!
How resolve problem (15 Replies)
hey all, im a new programmer.
i was wondering how you would go about writing the printf function yourself? it is my understanding that when you call printf you are calling an already written function and just providing an argument? if this is the case, is it possible to write that function... (8 Replies)
I use Solaris 10, I use following code:
#include <signal.h>
int main(void){
printf("----------testing-----------");
if(signal(SIGUSR1,sig_usr)==SIG_ERR)
err_sys("can't catch SIGUSR1");
for(;;)
pause();
sig_user(int signo){
.....
}
when I run above code,it print nothing... (3 Replies)
Following code is detecting solaris daytime,when I run it,I can't get any result,code is follows:
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define BUFFSIZE 150
int main(){
... (2 Replies)
Hi all.
I have a script as below:
cutmth=`TZ=CST+2160 date +%b`
export cutmth
echo $cutmth >> date.log
sed -n "/$cutmth/$p" alert_sbdev1.log > alert_summ.log
My purpose is to run through the alert_sbdev1.log and find the 1st occurence of 'Jan' and send everything after that line to... (4 Replies)
I am thankful for this site and for the many links provided. I have been going through one of the tutorials, but as I try some things, they don't seem to work.
I am wondering if there is something I need first before being able to use a tutorial (like version number (HP-UX) or how I am getting... (1 Reply)
Discussion started by: arungavali
1 Replies
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