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HEAD
BSD 3 development
[unix-history]
/
usr
/
src
/
cmd
/
learn
/
maktee.c
#include
"stdio.h"
#include
"signal.h"
#include
"lrnref"
static int
oldout
;
static char
tee
[
50
];
maktee
()
{
int
fpip
[
2
],
in
,
out
;
if
(
tee
[
0
] ==
0
)
sprintf
(
tee
,
"%s/tee"
,
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
);
fprintf
(
stderr
,
"Tee exec failed
\n
"
);
exit
(
1
);
}
close
(
in
);
fflush
(
stdout
);
oldout
=
dup
(
1
);
close
(
1
);
if
(
dup
(
out
) !=
1
)
fprintf
(
stderr
,
"Error making tee for copyout
\n
"
);
close
(
out
);
return
(
1
);
}
untee
()
{
int
x
;
fflush
(
stdout
);
close
(
1
);
dup
(
oldout
);
close
(
oldout
);
wait
(&
x
);
}