I know how to add signal to a set. But what if I want to add 2 or 3 signals to the set.
I know I can use sigaddset (&set,SIGBUS)....but what if I want to add SIGBUS and SIGALRM at once. Do i have to do it like this..
Is there another way to do this?. Also is it possible to individually unblock signals in the set. I know that by calling
[code]
sigprocmask(SIG_UNBLOCK......) you can unblock all signals that are block in the set.But what if you want to only unblock one signal in the set.
Last edited by joker40; 10-24-2010 at 12:32 PM..
Reason: adding something
(posted this in the scripting forum as well, but figured it should go here) So, what's going on is this:
For our program, we had to create our own shell, and if the user pressed ctrl-c just at the cmdline, then this signal would be ignored, but if there is a foreground process running, let's... (0 Replies)
How can use signals in a C program If i want a child program to signal it's parent program that it(child) program has completed the task that it was assigned.:confused: (2 Replies)
can any one give me an example of a concurrency program in threads and signals, i.e how to deliver messages between threads using signals. thanks (0 Replies)
I have following problem with this code..
First time trough the main loop.....
perror gives ....blocked signal:success(all other times gives illlegal seek)
Should every time trought the main loop be success??
And the perror otside of main loop...didn't change mask:success
That line of code... (2 Replies)
I was wondering about following. If I have set of 3 signals. And they are all blocked.Now at some point in the program the set is unblocked. Which signal will be delivered first.This is my set....SIGTSTP,SIGQUIT,SIGINT.When I added them in the set and unblock them I did it in following order...
... (1 Reply)
If I explicity ignore a signal (for example, SIGALRM), and this signal is generated during a blocking system call (for example, a recvfrom() ), what happens to the system call?
Does it abort, or does it remain blocked until its end? (2 Replies)
Hi All,
The problem statement is as below:
Problem: A process (exe) is getting executed in background. The output of this process is getting logged in a file. After successfully running for some time the process gets terminated. In the log file following is present:
^M[7m Interrupt ^M[27m... (8 Replies)
I am having issues with trap not working inside a script. I am currently trying this on a Knoppix system V 5.1. What I would like to happen is when I press control c, a message gets echoed and the script is ended. For example:
#! /bin/bash
trap "echo CTRL c was pressed ; break" SIGINT... (11 Replies)
among the below socket programming api's, please let me know which are blocking and non-blocking.
socket
accept
bind
listen
write
read
close (2 Replies)
Discussion started by: VSSajjan
2 Replies
LEARN ABOUT ULTRIX
sigdelset
sigsetops(3) Library Functions Manual sigsetops(3)Name
sigemptyset, sigfillset, sigaddset, sigdelset, sigismember - manipulate signal sets (POSIX)
Syntax
#include <signal.h>
int sigemptyset(set)
sigset_t *set;
int sigfillset (set)
sigset_t *set;
int sigaddset(set,sig)
sigset_t *set;
int sig;
int sigdelset(set,sig)
sigset_t *set;
int sig;
int sigismember(set,sig)
sigset_t *set;
int sig;
Description
The functions manipulate signal sets used by the other POSIX signal functions
The function initializes the signal set pointed to by the argument set so that all signals are excluded.
The function initializes the signal set pointed to by the argument set so that all signals are included.
The and functions respectively add and delete the individual signal specified by the value of the argument sig from the signal set pointed
to by the argument set.
The function tests whether the signal specified by the value of the argument sig is a member of the set pointed to by the argument set.
Return Values
Upon successful completion, the function returns a value of 1 if the specified signal is a member of the set. If it is not a member of the
set, a value of 0 is returned.
If the or functions fail a -1 value is returned and errno is set to indicate the reason.
Diagnostics
The function will fail and the signal mask will remain unchanged if one of the following occur:
[EINVAL] The value of the sig argument is not a valid signal number
See Alsosigprocmask(3), sigaction(3), sigsuspend(3), sigpending(2)sigsetops(3)