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Full Discussion: How to create constantly running process
Top Forums Programming How to create constantly running process Post 302086211 by bhakti on Wednesday 23rd of August 2006 01:48:19 AM
Old 08-23-2006
How to create constantly running process
Ther are two process in my program and i want both to constantly running. So i have written the following code. But one of this process which is calling function wsJobCheck() is getting terminated with giving message : Program exited normally.

Can any one suggest why this is happing.
Code :

Code:
#include"listen_to_ms.h"
#include"job_header.h"  /*all headers files are included in this header file*/
#include"ws_job_check.h"

extern void callWSJobCheck(int);
int main()
{

    /* declaration */
    pid_t childpid;
    int j=0;
    struct passwd *pwd;
   
   
    /* creating a new child process */
    childpid=fork();
    if(childpid==0)
    {
        /* crete processes for listening to WS */
        listenToMS();
        exit(0);
    }

    if(signal(SIGALRM,callWSJobCheck)==SIG_ERR)
    {
        fprintf(stderr, "\nIN MAIN FUNCTION       :     Error in SIGALRM\n");
    }
    else
    {
        alarm(20);
    }


    return 0;
}


void callWSJobCheck(int signal)
{
    wsJobCheck();
    alarm(10);
    printf("\nIN MAIN FUNCTION       :     signal : %d",signal);
}

I am working on AIX os.
Last edited by blowtorch; 08-23-2006 at 10:27 AM.. Reason: to put in code tags...
 

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LEARN ABOUT SUNOS

setsid

setsid(2)							   System Calls 							 setsid(2)

NAME

       setsid - create session and set process group ID

SYNOPSIS

       #include <sys/types.h>
       #include <unistd.h>

       pid_t setsid(void);

DESCRIPTION

       The  setsid() function creates a new session, if the calling process is not a process group leader. Upon return the calling process will be
       the session leader of this new session, will be the process group leader of a new process group, and will have no controlling terminal. The
       process	group	ID of the calling process will be set equal to the process ID of the calling process. The calling process will be the only
       process in the new process group and the only process in the new session.

RETURN VALUES

       Upon successful completion, setsid() returns the value of the process group  ID of the calling process. Otherwise it returns (pid_t)-1  and
       sets errno to indicate the error.

ERRORS

       The setsid() function will fail if:

       EPERM	       The calling process is already a process group leader, or the process group  ID of a process other than the calling process
		       matches the process  ID of the calling process.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getsid(2), setpgid(2), setpgrp(2), attributes(5), standards(5)

WARNINGS

       A call to setsid() by a process that is a process group leader will fail. A process can become a process group leader  by  being  the  last
       member of a pipeline started by a job control shell. Thus, a process that expects to be part of a pipeline, and that calls setsid(), should
       always first fork; the parent should exit and the child should call setsid(). This will ensure that the calling process will work  reliably
       when started by both job control shells and non-job control shells.

SunOS 5.10							    21 Aug 2002 							 setsid(2)
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