I was wondering if there was a way to add a switch to a gcc/g++ call everytime. I have a few libraries that I need to compile for different processors. Each has a makefile which calls gcc to compile. Here is the best option I could come up with so far:Include a Makefile and define CC as gcc -mcpu=xxx.
View 4 Repliesi have only basic knowledge of C so guys plz help me...is C language support call the C executable inside the C ?example contect mainA.c have a many function define in the struct,when i compile mainA and make a executable the name is ( A ),can i use executable C inside the C <my C program call the executable ( A ) > .
View 9 Replies View Relatedin below program why was new_args[0], rather than the reference the_cmd, passed to the execvp system call?
Code:
/*
A _very_ limited shell program
[code]....
I have created a executable file using c and I have also created a GUI using GTK+. Now how can I call the executable file from the GUI with arguments passing to the executable file.
View 4 Replies View RelatedThere are examples everywhere about calling f77 subroutine from IDL, but I have not found any material about IDL calling fortran written in f90 way(free style). I tried the following example, but write the subroutines in free style. When I run the makefile, it gives an error 'undefined reference to main_'.
Code:
SUBROUTINE SUM_ARRAY(argc, argv) !Called by IDL
INTEGER*4 argc, argv(*) !Argc and Argv are integers
j = LOC(argc) !Obtains the number of arguments (argc)
[code]....
In practice I have a script that call a java program that call a linux system command. The script if I run it, from a shell functions well,so it is not a java problem. The problem come out when i put this script in a crontab schedulation. The result in this case is that java do not execute the system command. I think it depends on crontab
View 4 Replies View RelatedI am facing issue in my OPENSSL code. I have written openssl client. It sends request to the host and receives response for that request.
My problem is, it connects, sends request successfully to host at first time only in sencond attempt it fails on SSL_write(). where SSL_get_error() returns SSL_ERROR_SYSCALL error.
In that ERR_get_error() returns 0. man page shows "If ret == 0, an EOF was observed that violates the protocol".
Code Snippet.
w=SSL_write(SSLRequestData.ssl,c2s,c2sl);
switch(SSL_get_error(SSLRequestData.ssl,w))
{
case SSL_ERROR_NONE:
if(c2sl!=w)
[Code]....
I have a process that forks, where the childs puts some data of random size and exits while the parent should get the data and does some manipulation.. here I have used a pipe for child to write the data and parent to read the data.. Child simply dumps the data, and the data is of any size even child and parent doesnt know.
I have used select in the parent to see whether there is any data coming on the reading end of the pipe.. if there is a data.. I copy into a buffer.. Im reading the data continusly when the child exits after closing the writing end of pipe. Parent gets blocked on the read part But my question is how parent know the other of pipe is closed when using the select call. In otherwords.. while using select in readfds, how would i know the other end has closed the pipe..
I am trying to figure out how i would go about finding out where system call is made and error checking is not done. I have code below, if somebody can point me in the right direction where system call is made but error checking is not done.Quote:
#include "shell.h"
#include <stdio.h>
#include <string.h>
[code]....
i used ldap for authentication.now i have a perl script that users use it for login(contact.pl),then this script calls a shell script(ip.sh) for create iptables chain.
when i call that into contact.pl ,it just prints: usr/sbin/iptables but ip chains didn't change.what is problem? whenever run ip.sh in bash it works correctly
I need to redirect a /usr/sbin/sendmail command to $HOME/bin/msmtp .The sendmail command would be coming from a PHP5 application. I'm assuming the best way is to use .bashrc, but .htaccess is also available.The remote server is a shared web host which is running Debian 4.0.I do not have root access.I have SSH access.
View 2 Replies View RelatedI have a script which takes an array as an input to the file.ex: test.ksh -l <array_value>
Every time I dont get the same array name.EX: test.ksh -l x ; where x="a b"test.ksh -l y ; where y="c d"
I store the value I get in l in varaible myLvalue.Now indise my Script I want to run a for loop for thevalue I get in -l.If I write the for loop as below. I'm getting value x.However I'm expecting the loop to run for a and b.
I successfully added a new system call in CentOS Kernel but I don't know where to view it! My kernel version is -2.6.32.5
View 2 Replies View Relatedhow to create a new system call Linux? what is the process of creating ?my project is to create a system call for displaying owner of a file..where exactly we have to write the system call code? and where are the places need to change ?
View 5 Replies View RelatedI am trying to write a bash script to call from a terminal that will change the terminal title. I am using ubuntu 10.04. The script is meant to be used in the gnome-terminal.
Here is what I have:
Code: #! bin/bash
echo "New title: c"
read title
echo "33]0;$titl07c" -e
[Code]....
it doesn't work
I think the problem has to do with modifying PS1 inside the bash so i tried this:
Code: echo `export PS1="[e]1;u@h:wa]${debian_chroot:+($debian_chroot)}u@h:w$ "` and it still didn't work.
I am a newbie in linux n programming, I need to use ubuntu for my research at school about building an IMS server use openims.
The problem is I need an additional script in C/C++ for my openims server to make an extension call. I hope one number can represent 3 client as receiver/operator. So, when I call the number, the server can forward the call to those three receiver by hunt.
1st call will be forward to the 1st receiver.
2nd call will be forward to the 2nd receiver.
3rd call will be forward to the 3rd receiver.
then, 4th call will be forward back to the 1st receiver, etc.
I have a write call to a ttyACM serial device that blocks after several hundreds bytes are written.I'm writing in ~25 byte chunks, so I have 5-8 successful writes, then the next write blocks forever.I can bypass the blocked call using select, but I can never call write again without closing and re-opening the port.
The serial port is opened correctly because I can read from it just fine. Write permissions are correct, and it's opened RW.The code is likely correct because I tested the same code using the same device on a pure RS-232 serial port, and it worked fine - no block. Is there anything to know about the linux ACM module?It's my understanding that write calls basically shouldn't block.They're supposed to return -1 if there's an error.
I am trying a scenario for calling a shell script when ever a trigger is called. Can some one guide me how to achieve this scenario. Also it should passes the value from the table to the shell script. Can some one explain me along with the example.
View 2 Replies View RelatedI want to test my system call that be goint to add to kernel, But when i finish compiling kernel, i found my system call code not work. the code i want to return the system time "struct timespec":
/*----------Start of mycall.c----------*/
#include <linux/linkage.h>
#include <linux/time.h>
#include <linux/kernel.h>
[code]....
so i want a method to test the new system call before compiling kernel.
I got two cgi shell scripting files. Is it possible when i am in file 1, to call a function from file 2?
View 2 Replies View RelatedHi I am trying to add the device by using followig code strip and it says that eth1 is not defind in the code.
strncpy(ifr.ifr_name,eth1,IFNAMSIZ);
if (ioctl(sd, SIOCGIFINDEX, &ifr) == -1) {
return 0;
}
How do I write down the DEVICE name in the ifr.ifr_name structure ?
I am working on software that is to run on a variety of linux machines where changing the os/version is not an option.My software uses the inotify_rm_watch call, and this is occassionally failing. In every case the operands are both valid, yet the result is EINVAL. This appears to only occurr when a watched file is deleted, and the read command on the inotify yeilds two events IN_DELETE_SELF AND IN_IGNORE (at the same time).I have seen a few messages detailing this same scenario - but no workarounds.
View 7 Replies View Relatedi am using front end as java and back end RHEL5.i am trying to calling a bash script with java. but i am facing problem.i am using following java coding to use call the bash script
import java.util.*;
import java.io.*;
public class b
[code]....
where the printk messages are stored when we call a insmod? I'm using Slackware, and I think my distro can store these messages on others place.
View 3 Replies View RelatedI have a QNX machine with a slinger webserver running on it. With a cgi script i'm trying to do the QNX cksum call and compare it's output value with a fixed output. When i execute the script at the command line it works perfect, but when execute this script by by the webserver in my browser it doesn't work. Here's my code:
#!/bin/sh
FILE="/home/checkfile"
ORIGCHECK="1712885500"
[code].....
Could it be possible that i'm not allowed to do the cksum call in combination with the slinger webserver?
The following is the UDP client code I am using.
Code:
Even the server is down, sendto function is not returning -1.
Instead, it is returning the length of the message as if it is success.
Anyone know the reason why a sleep( ) on a Redhat Linux OS would cause the system to indefinitely hang? It's doing this every 10 or so calls in my program and I have to press the reboot button on my computer. My program is reading from a UDP port that has messages sent to it 20 times per second. When I sleep I assume the internal UDP buffer is getting more and more filled.
View 14 Replies View RelatedI'm looking for a way to launch "TRIM" commands to a SSD drive myself, from a c++ code I'm going to write, for flash erasing an SSD drive (and not to wait for others things that "should do it automatically in some circumstances if this or this, this and this have been enabled and [..]" but will never tell me if it worked or not
I know there is thousands of complicated ways to test and check if it worked, and also software that needs money to do so, that's why I just want to call myself the TRIM functions and read the return value (like true or false) in order to know if it worked !
Where I can find the c++ call that could permit me to do so ? I heard about the GLibC that gives a way to access every user space function related to Linux Kernel (poll, select and others) as standard c++ functions, I suppose that, if there is a way, it will be on the GLibC but how to find it ?
I need to call a vbscript from another vbcrip running X amount of times.
View 1 Replies View Relatedi've written small tool in C which makes measurements on my router (OpenWrt White Russian).
It is working as a deamon. If the tool is started manually, everything works fine. If it is started per script on startup, the following system call doesn't work :
Code: sprintf(command,"/bin/cat /root/%s%s | /usr/bin/ssh -p2222 user(at)host -i /root/.ssh/id_rsa "/bin/cat >> result/%s%s"", apmac, source, apmac, dest);
rc = system (command); the returned rc in this case is 256.
first i thought it is a problems with the user rights for the tool, so i have added +s to it. but that didn't help. as i said, when the daemon is started by hand, the system call works fine.