I tried using the following code to execute a program but it doesnt seems to be working .. I would like to know whats wrong wit it .
execve("/bin/cat", "words", NULL); (0 Replies)
Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:... (2 Replies)
hello everybode.Got some sort of "problems" with this stuff;
well this is a program
int main()
{
int Pipe;
int origStdin, origStdout;
int childPID;
origStdin = dup(0);
origStdout = dup(1);
pipe(Pipe);
if( (childPID = fork()) < 0 )
{
perror(... (2 Replies)
Hi,
I'm writing a monitor program that can be notified once a process makes an execve system call and then stop that process for examining before it starts to run the new code. I know I can ptrace a process to achieve this, but I do not want to ptrace every process in the system. Is it possible?... (1 Reply)
Disclaimer: This is just a rainy day experiment. There is no expected "goal" other than to understand UNIX better.
After reading about fork and exec, my understanding is that forking, as the UNIX shell does by design, consequentially may sacrafice some speed versus an approach that runs in... (1 Reply)
Hello everybody.I want to make clear that i am not going to ask from anybody to build my asignement but i have a big problem. I can't seem to find anywhere ONE good example on C about what i am trying to do:wall:.I think it is simple. All i ask is one example, even a link is fine.
So, i want to... (1 Reply)
Hi guys,
I need to know how i can ignore Pipe '|' if Pipe is coming as a column in Pipe delimited file
for eg:
file 1:
xx|yy|"xyz|zzz"|zzz|12...
using below awk command
awk 'BEGIN {FS=OFS="|" } print $3
i would get xyz
But i want as :
xyz|zzz to consider as whole column... (13 Replies)
Hi,
I have the following scenario..
1) I have a binary which i launch from command line. It executes fine.
2) But when I launch it from another file using execve command, it gives a message that it is not able to access a shared object ".so" in /usr/bin (message is "Permission... (4 Replies)
The task I have to do is something along the lines "I receive some input and based on the first character I send it through pipe to one of the children to print".
The scheme it is based on is 1->2; 1->3; 1->4; 2 will print all the input that starts with a letter, 3 will print all the input that... (2 Replies)
Discussion started by: Ildiko
2 Replies
LEARN ABOUT DEBIAN
config::model::backend::yaml
Config::Model::Backend::Yaml(3pm) User Contributed Perl Documentation Config::Model::Backend::Yaml(3pm)NAME
Config::Model::Backend::Yaml - Read and write config as a YAML data structure
VERSION
version 2.021
SYNOPSIS
use Config::Model ;
use Log::Log4perl qw(:easy) ;
use Data::Dumper ;
Log::Log4perl->easy_init($WARN);
# define configuration tree object
my $model = Config::Model->new ;
$model ->create_config_class (
name => "MyClass",
element => [
[qw/foo bar/] => {
type => 'leaf',
value_type => 'string'
},
baz => {
type => 'hash',
index_type => 'string' ,
cargo => {
type => 'leaf',
value_type => 'string',
},
},
],
read_config => [
{ backend => 'yaml' ,
config_dir => '/tmp',
file => 'foo.yml',
auto_create => 1,
}
],
) ;
my $inst = $model->instance(root_class_name => 'MyClass' );
my $root = $inst->config_root ;
my $step = 'foo=yada bar="bla bla" baz:en=hello
baz:fr=bonjour baz:hr="dobar dan"';
$root->load( step => $step ) ;
$inst->write_back ;
Now, "/tmp/foo.yml" contains:
---
bar: bla bla
baz:
en: hello
fr: bonjour
hr: dobar dan
foo: yada
DESCRIPTION
This module is used directly by Config::Model to read or write the content of a configuration tree written with YAML syntax in
"Config::Model" configuration tree.
Note that undefined values are skipped for list element. I.e. if a list element contains "('a',undef,'b')", the data structure will contain
'a','b'.
CONSTRUCTOR
new ( node => $node_obj, name => 'yaml' ) ;
Inherited from Config::Model::Backend::Any. The constructor will be called by Config::Model::AutoRead.
read ( io_handle => ... )
Of all parameters passed to this read call-back, only "io_handle" is used. This parameter must be IO::File object already opened for read.
It can also be undef. In this case, "read()" will return 0.
When a file is read, "read()" will return 1.
write ( io_handle => ... )
Of all parameters passed to this write call-back, only "io_handle" is used. This parameter must be IO::File object already opened for
write.
"write()" will return 1.
AUTHOR
Dominique Dumont, (ddumont at cpan dot org)
SEE ALSO
Config::Model, Config::Model::AutoRead, Config::Model::Backend::Any,
perl v5.14.2 2012-11-09 Config::Model::Backend::Yaml(3pm)