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From: "Scott Hess" <scott@avantgo.com>
To: <freebsd-questions@freebsd.org>
Subject: rfork() with RFMEM returns EOPNOTSUPP on 3.3-release.
Date: Tue, 4 Jan 2000 13:36:55 -0800
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I'm having a bizarre problem.  From the rfork man page, it appears that I
should be able to call rfork( RFPROC|RFMEM) to get a new process which
shares the current process' virtual memory.  Instead, I get a -1 return
with errno==EOPNOTSUPP.  The following snippet works fine when compiled
with 'cc -o rfork rfork.c', but doesn't work when compiled with 'cc -o
rfork -DSHAREMEM rfork.c'.

Everything looks right, anyone know what I'm missing?

Thanks,
scott

The snippet:
#include <unistd.h>

void main( void)
{
    int cpid;
    printf( "In parent\n");
#ifdef SHAREMEM
    cpid=rfork( RFPROC|RFMEM);
#else
    cpid=rfork( RFPROC);
#endif
    if( cpid==-1) {
        perror( "rfork");
    } else if( cpid==0) {
        printf( "In child cpid==%d and pid==%d\n", cpid, getpid());
        sleep( 1);
        printf( "Child exitting\n");
    } else {
        printf( "In parent cpid==%d and pid==%d\n", cpid, getpid());
        sleep( 2);
        printf( "Parent exitting\n");
    }
}





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