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 gets executed only once just before program is done. I dont get how at that point can it be success?
Can anyone be kind to explain this please.
(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)
Dear all,
I use perror in order to print an error message to the standar error. For example
if a C program is called without its two necessary command line parameters
then :
if (argc != 3)
{
perror("use: ./myProgram <source file> <target file>\n");
return 1;
}
Now the... (2 Replies)
here the program gives a odd result:
#include <stdio.h>
int main(){
perror("first");
perror("next");
return 0;
}
result:
first: Success
next: Illegal seek
why? any resonable explanation? i found no information about this in man pages.
thanks in advance (2 Replies)
I have problem with my application. Application is running on embedded Linux machine. It's basically multiprotocol gateway that connects two industrial Ethernet networks.
We are experiencing some kind of application hang every 2 to 3 days. It seems like both threads are still running but... (12 Replies)
I am having trouble with folowing
sigset_t s; // now s represents set of signals
sigemptyset(&s) ; // initialize this set and exclude all the signals from it.is it empty?
sigaddset(&s,SIGILL);//this set containts only SIGILL signal
sigprocmask(SIG_BLOCK,&s,NULL);//lost on this one
Can... (3 Replies)
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..
sigaddset (&set,SIGBUS);
sigaddset (&set,SIGALRM);
Is there another way to... (0 Replies)
i am trying to use the perror function:
something like
perror("WRONG!!!");
but when i see the message in the terminal, it comes out like
WRONG!!! : Success
How can i change it to
WRONG!!! : WRONG!!!
well i just want to have my own custom message for the part after the colon... (1 Reply)
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)
Discussion started by: Praty.27
8 Replies
LEARN ABOUT OSF1
perror
perror(3) Library Functions Manual perror(3)NAME
perror - Writes a message explaining the current setting of errno
LIBRARY
Standard C Library (libc.a, libc.so)
SYNOPSIS
#include <stdio.h>
void perror(
const char *string);
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
perror(): ISO C, POSIX.1, XPG4, XPG4-UNIX
Refer to the standards(5) reference page for more information about industry standards and associated tags.
PARAMETERS
Points to a string containing the name of the program that caused the error.
DESCRIPTION
The perror() function writes a message on the standard error stream that describes the current setting of the external variable errno. The
error message includes the string pointed to by the string parameter, followed by a : (colon), a blank, the system message string, and a
newline character. The string parameter string should point to the name of the program that caused the error.
To get the system error message string for use by a program, as opposed to displaying it on standard error, use the strerror() function.
For more information, see strerror(3).
RELATED INFORMATION
Routines: printf(3), strerror(3)
Standards: standards(5) delim off
perror(3)