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 SUSE
sysv_signal
SYSV_SIGNAL(3) Linux Programmer's Manual SYSV_SIGNAL(3)NAME
sysv_signal - signal handling with System V semantics
SYNOPSIS
#define _GNU_SOURCE
#include <signal.h>
typedef void (*sighandler_t)(int);
sighandler_t sysv_signal(int signum, sighandler_t handler);
DESCRIPTION
The sysv_signal() function takes the same arguments, and performs the same task, as signal(2).
However sysv_signal() provides the System V unreliable signal semantics, that is: a) the disposition of the signal is reset to the default
when the handler is invoked; b) delivery of further instances of the signal is not blocked while the signal handler is executing; and c) if
the handler interrupts (certain) blocking system calls, then the system call is not automatically restarted.
RETURN VALUE
The sysv_signal() function returns the previous value of the signal handler, or SIG_ERR on error.
ERRORS
As for signal(2).
CONFORMING TO
This function is nonstandard.
NOTES
Use of sysv_signal() should be avoided; use sigaction(2) instead.
On older Linux systems, sysv_signal() and signal(2) were equivalent. But on newer systems, signal(2) provides reliable signal semantics;
see signal(2) for details.
The use of sighandler_t is a GNU extension; this type is only defined if the _GNU_SOURCE feature test macro is defined.
SEE ALSO sigaction(2), signal(2), bsd_signal(3), feature_test_macros(7), signal(7)COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
2007-05-04 SYSV_SIGNAL(3)