i 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 RepliesI 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 RelatedI 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 want to find the cpu time taken by an executable to run.. the executable is writting the output to a file. i want to write the time takem by cpu to the same output file.
like:
abc is my executable which is taking input as input file and writing the result in output file.. i want to append cpu time information in the same file. can i do it with time command?
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 Replies View RelatedI have written C++ programs on Windows. I am now learning Linux to ensure my software is portable. I can compile and run C++ programs from the bash shell, but I cannot run my executable programs from the GUI.Here is my sample program:
Code: #include <iostream>
int main()
{
[code]...
I'm maintaining a c++ application running on a 64-bit RHEL5 server w/32GB ram, but compiled to be a 32-bit executable with g++. The application handles large amounts of data, and has lately been throwing a st9bad_alloc exception. "top" shows the application as dieing right around when VIRT=~3GB, SWAP=~1.5GB and RES=~1.5GB. In the core dump I can see that it's consistently failing to push_back() a piece of data onto a std::vector (which already has hundreds of thousands of objects in it).
I know 4GB is the maximum address space for 32-bit applications. I've learned from this lwn article that a 32-bit kernel reserves 1GB of address space, leaving 3GB for user space. However I'm not running a 32-bit kernel, so that really doesn't answer anything.I wrote a dummy app which called malloc() over and over in a for loop, and it is able to allocate right up to the 4GB before it fails. I don't understand why this one seems to be able to allocate more.
The only difference between the two apps (besides malloc vs std::vector:ush_back), is that the 3GB crashing application attaches to 512mb of shared memory.Anyone have any ideas why this application would be crashing at 3GB? Is there any more diagnostics I should be doing? I would ultimately like to port this to 64-bit for a number of reasons, but it is a big undertaking for my organization, and I'd like to better understand what's going on here.
It is possible to run multiple instances of a jar executable. Is it possible that only a single instance of the jar runs? Wrappers like JSmooth or Launch4J can be made to run as a single instance. But since there are no such wrappers for linux, I need a way to restrict the jar to a single instance. How to embed the jar file into an executable such it runs a single instance?
View 14 Replies View Relatedwhen compiling a c++ program in g++ on Linux, how can I add version information to that executable and if possible is there a Linux utility to read the version information?
View 2 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]....
There 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 very new to shell script, and my requirement is --
1. open the apache access log, use "cut" and "grep" to find the numbers.
2.put the result in a file
3.then compare the same result with day before result
4. send the result via e-mail.
so how can i do that , using some functions..
Is is possible to use a class inside a struct? I keep getting segmentation fault with this code:
Code:
struct my_struct {
unsigned count;
std::string msg;
[code]....
I want to read content of a file inside a gawk script.I know that by using "gawk -f filename" I can read a file, but I want to do that inside the script.
View 7 Replies View RelatedBasically I have a dir that contains my makefile and another directory inside this called source this holds main source files. External to these I have a couple of dirs common and drives.
In my make file I use
To include the protoypes from the headers in the folders common and drivers used by source, this works fine. However in common and drivers I use a few variables that are set in the source dir. I set these with externs inside the common and driver files. However I'm sure I should be able to set the directory path for source inside my makefile. So say I have inside source hardware.h with prototypes, I set DINCDIR = -I/Source -I../Drivers -I../CommonFiles
Then from a c file inside my common folder I say #include "hardware.h" the file should be able to see hardware.h and it's protoypes. However I get:
Is there some way I can get the extern dirs to see the source dir?
The set out is something like;
I am developing a script for the first time.
I am calling a script B.sh from A.sh
What if B.sh fails to run...how to go about it...
I am trying to run Wattch simulator in linux.But it is giving the error below. what is this error and what do I do about it?
fatal: bad magic number in executable `prime' (not an executable?)
I am trying to use a software package written in ANSI C. It has a makefile which has to be executed first.
As soon as I execute it I get messages like: line i: command not found.
Commands for which I am getting errors :
CC = /usr/bin/gcc
GCCFLAGS = -c -Wall
ROOTDIR = .
My gcc compiler is located in the above directory only. In ROOTDIR also I tried giving the path in which all the required files & folders are present but still I get the command not found error in all the lines.
I wrote a c++ program but for security reasons I need to make sure that no one can read my codes by my ".out" files. I did everything I could. But everyone can see it by "strings Alpha.cpp".I heard that g++ has some options to do so.
View 7 Replies View RelatedSince I read that executing a library could return its version number, I ran "/lib/libc.so.0" on uClinux, but it triggers an error.I'm told that random libraries are not directly executable. Does someone know what a random library is?PS: In case that matters, here's the short version of the error:
Code:
Undefined instruction
<5> - May be used to emulate instructions that are not defined for
[code]....
I 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 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 Relatedim pretty sure this is a remedial task for many of you but im having an issue with arrays from a shell script being accessed in an awk command. im pretty good with shell scripting but i am embarrassingly unfamiliar with awk. so here's the meat of the script...
Code:
I am trying to take an input file of ip addresses and corresponding netmasks and put it into a format to be loaded onto a juniper switch. the result should look something like this.. x.x.x.x/netmask using the cidr notation. no matter what subnet is provided though, /32 always gets appended to the end of the ip even when it should be /16, /24, etc... also, the cisco part works fine so that doesnt need any attention.
I want to do the following redirectin inside a bash script :
1. all the stdout will be redirected to a /tmp/log
2. all the errors will go to the stderr and also to the /tmp/log.
The following inside a bash script is not working, WHY and HOW to do it:
Rest of the bash script.