BSD 4_2 release

[unix-history] / usr / src / usr.bin / learn / maktee.c

#ifndef lint
static char sccsid[] = "@(#)maktee.c    4.2     (Berkeley)      4/25/83";
#endif not lint

#include "stdio.h"
#include "signal.h"
#include "lrnref.h"

static int oldout;
static char tee[50];

maktee()
{
       int fpip[2], in, out;

       if (tee[0] == 0)
               sprintf(tee, "%s/bin/lrntee", direct);
       pipe(fpip);
       in = fpip[0];
       out= fpip[1];
       if (fork() == 0) {
               signal(SIGINT, SIG_IGN);
               close(0);
               close(out);
               dup(in);
               close(in);
               execl (tee, "lrntee", 0);
               perror(tee);
               fprintf(stderr, "Maktee:  lrntee exec failed\n");
               exit(1);
       }
       close(in);
       fflush(stdout);
       oldout = dup(1);
       close(1);
       if (dup(out) != 1) {
               perror("dup");
               fprintf(stderr, "Maktee:  error making tee for copyout\n");
       }
       close(out);
       return(1);
}

untee()
{
       int x;

       fflush(stdout);
       close(1);
       dup(oldout);
       close(oldout);
       wait(&x);
}