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Full Discussion: How to access argv[x] from another function other than main???
Top Forums Programming How to access argv[x] from another function other than main??? Post 302582867 by gabam on Monday 19th of December 2011 12:17:13 AM
Old 12-19-2011
How to access argv[x] from another function other than main???
Hi friends,
when I am passing arguments to main, I want another function to be able to have access to that function, the problem is that I am creating athread, which has a function like void *xyz(void *), how can pass the refernce of argv[x] to this function, if you see my program, you will better see the problem, so here it is!

Code:
 
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
 
int main(int argc, char *argv[])
{
        void *thread1(void *);
        void *thread2(void *);
        if(argc != 2)
        {
        printf("Invalid no. of arguments!\n");
        exit(-1);
        }
        else
        {
        pthread_t tid1;
        pthread_t tid2;
        int t1 = 1;
        int t2 = 2;
        pthread_attr_t attr1;
        pthread_attr_t attr2;
        pthread_attr_init(&attr1);
        pthread_attr_init(&attr2);
        {
        pthread_create(&tid1,&attr1,thread1,(void *)t1);
        pthread_create(&tid2,&attr2,thread2,(void *)t2);
        }
        {
        pthread_join(tid1,NULL);
        pthread_join(tid2,NULL);
        }
        printf("\nThreads finished!\n");
        }
        return 0;
}
void *thread1(void *n)
{
        while(1)
        {
        printf("%s\n\n",argv[1]);
        sleep(1);
        }
        pthread_exit(0);
}
void *thread2(void *n)
{
        while(1)
        {
        printf("%s\n\n",argv[2]);
        sleep(1);
        }
        pthread_exit(0);
}

I this program the two thread functions don't have access to arv, what should I do???

Thanks
 

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LEARN ABOUT CENTOS

tk_main

Tk_Main(3)						       Tk Library Procedures							Tk_Main(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Tk_Main - main program for Tk-based applications

SYNOPSIS

       #include <tk.h>

       Tk_Main(argc, argv, appInitProc)

ARGUMENTS

       int argc (in)				  Number of elements in argv.

       char *argv[] (in)			  Array of strings containing command-line arguments.

       Tcl_AppInitProc *appInitProc (in)	  Address  of  an  application-specific  initialization procedure.  The value for this argument is
						  usually Tcl_AppInit.
_________________________________________________________________

DESCRIPTION

       Tk_Main acts as the main program for most Tk-based applications.  Starting with Tk 4.0 it is not called main anymore because it is part	of
       the Tk library and having a function main in a library (particularly a shared library) causes problems on many systems.	Having main in the
       Tk library would also make it hard to use Tk in C++ programs, since C++ programs must have special C++ main functions.

       Normally each application contains a small main function that does nothing but invoke Tk_Main.  Tk_Main then does all the work of  creating
       and running a wish-like application.

       When  it  is  has  finished  its own initialization, but before it processes commands, Tk_Main calls the procedure given by the appInitProc
       argument.  This procedure provides a "hook" for the application to perform its own initialization, such	as  defining  application-specific
       commands.  The procedure must have an interface that matches the type Tcl_AppInitProc:
	      typedef int Tcl_AppInitProc(Tcl_Interp *interp);
       AppInitProc is almost always a pointer to Tcl_AppInit; for more details on this procedure, see the documentation for Tcl_AppInit.

KEYWORDS

       application-specific initialization, command-line arguments, main program

Tk									4.0								Tk_Main(3)
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