according to stty, "raw mode" is
So if you handle all those flags, that will do.
Interrupts are an odd way to handle this, though. You may also need to worry about spurious interrupts too. Why not put just read() in a loop? If you have several streams competing for attention, you can use select() to wait for one of several file descriptors to become ready, so you don't block waiting for one while another needs attention. Or, you could multithread it to process different descriptors independently.
AIX 4.3.3
I am trying to write a signal handler into a ksh shell script. I would like to capture the SIGTERM, SIGINT, and the SIGTSTP signals, print out a message to the terminal, and continue executing the script. I have found a way to block the signals:
#! /bin/ksh
SIGTERM=15
SIGINT=2... (2 Replies)
hi
i am using solaris 9 on sparc .
i was wondering if there was a command to control my serial interface , as to send a signal periodically every interval of time to the input of a 555 timer .
thanks for your help .... (0 Replies)
Hi,
I have an c++ application which uses the function fork and execvp().
The parent does not wait until the child ends. The parents just creates children and let them do their stuff.
You can see the parent program as a batch-manager.
I have added a SIGCHLD handler to the program:
void... (3 Replies)
Hey guys,
I am trying to write a little shell, and was writing a signal handler to handle SIGINT (I am using 'stty intr ^C' and using ctrl-C to give SIGINT).
I wrote this signal handler: void handle_sigint()
{
write(2,"handling sigint\n",16);
write(1,"\nshell% ",8);
}
... (4 Replies)
I have written a program to demonstrate a problem I have encountered when using BSD style asynchronous input using the O_ASYNC flag in conjunction with a real time interval timer sending regular SIGALRM signals to the program. The SIGIO handler obeys all safe practices, using only an atomic update... (8 Replies)
I have a problem with signal handlers not working.
I have a long 1000 line code and somehow this code for signal handling is not working:
$SIG{INT} = \&interrupt;
sub interrupt {
print STDERR "Caught a control c!\n";
exit; # or just about anything else you'd want to do
}
Any... (2 Replies)
Hello,
I have develop a driver for my hardware and now, I need to handle a IRQ but I does not work.
As I can understand, to handle a irq, it is necessary to make a request_irq(). If the return value is zero, ok, no problem to handle irq.
Here is a easy example of my driver:
#include... (8 Replies)
Hi,
I have a problem with signal handler algorithm in linux. My code is hanging ( It is continuously looping inside the signal handler) . I am pasting my code here...
Please provide me some help regarding this. I googled many places and wrote this code.. but doesnt seem to be working without... (6 Replies)
I was working on some Perl code that does signal handling and I came across this one liner and wasn't sure what it was doing.
local $SIG{__DIE__} = sub {$! = 2; die $_;};
I think the first part of the anonymous subroutine is setting $! to 2, but I am not sure what the second part is doing. ... (1 Reply)
i m unble to execute code of
signal handler using
a) Wait b) Waitpid (1 Reply)
Discussion started by: madhura
1 Replies
LEARN ABOUT NETBSD
raise_default_signal
RAISE_DEFAULT_SIGNAL(3) BSD Library Functions Manual RAISE_DEFAULT_SIGNAL(3)NAME
raise_default_signal -- raise the default signal handler
LIBRARY
System Utilities Library (libutil, -lutil)
SYNOPSIS
#include <util.h>
int
raise_default_signal(int sig);
DESCRIPTION
The raise_default_signal() function raises the default signal handler for the signal sig. This function may be used by a user-defined signal
handler router to ensure that a parent process receives the correct notification of a process termination by a signal. This can be used to
avoid a common programming mistake when terminating a process from a custom SIGINT or SIGQUIT signal handler.
The operations performed are:
1. Block all signals, using sigprocmask(2).
2. Set the signal handler for signal sig to the default signal handler (SIG_DFL).
3. raise(3) signal sig.
4. Unblock signal sig to deliver it.
5. Restore the original signal mask and handler, even if there was a failure.
See signal(7) for a table of signals and default actions.
The raise_default_signal() function should be async-signal-safe.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
The raise_default_signal() function may fail and set errno for any of the errors specified for the functions sigemptyset(3), sigfillset(3),
sigaddset(3), sigprocmask(2), sigaction(2), or raise(3).
SEE ALSO sigaction(2), sigprocmask(2), raise(3), signal(7)HISTORY
The raise_default_signal() function first appeared in NetBSD 5.0.
BSD September 25, 2007 BSD