/* $Header$ */
/*
* Author: Peter J. Nicklin
*/
/*
* isfg() determines whether a process is a foreground job and standard
* input stream is connected to a terminal. Returns integer YES if it is,
* otherwise NO.
*/
#include <stdio.h>
#include <signal.h>
#include <sys/ioctl.h>
#include "system.h"
#include "yesno.h"
isfg()
{
int isfg = NO; /* is foreground? */
#ifdef V4BSD
int isatty(); /* is stream a terminal? */
int tpgrp; /* terminal process group */
int (*tstpstat)(); /* stop signal status */
int (*ttinstat)(); /* background read status */
int (*ttoustat)(); /* background write status */
tstpstat = signal(SIGTSTP, SIG_IGN);
ttinstat = signal(SIGTTIN, SIG_IGN);
ttoustat = signal(SIGTTOU, SIG_IGN);
if (isatty(fileno(stdin)))
{
ioctl(fileno(stdin), TIOCGPGRP, &tpgrp);
if (tpgrp == getpgrp(0))
isfg = YES;
}
signal(SIGTSTP, tstpstat);
signal(SIGTTIN, ttinstat);
signal(SIGTTOU, ttoustat);
#else
int isatty(); /* is stream a terminal? */
if (isatty(fileno(stdin)))
isfg = YES;
#endif
return(isfg);
}