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Update to reflect new calling conventions

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This commit is contained in:
Paul Traina 1995-02-25 20:15:20 +00:00
parent cb95dc2435
commit 8340e9ceab
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6714
1 changed files with 10 additions and 20 deletions
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30
share/man/man4/snp.4
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@ -1,7 +1,8 @@
.\"
.\" @(#)snp.4 1.1 (FreeBSD) 2/17/95
.\" $Id$
.\" $Source$
.\"
.Dd February 17, 1995
.Dd February 24, 1995
.Dt SNP 4
.Os FreeBSD
.Sh NAME
@ -11,11 +12,11 @@
.Fd #include <sys/ioctl.h>
.Fd #include <sys/snoop.h>
.Ft int
.Fn ioctl fd SNPSTTY &snptty
.Fn ioctl fd SNPSTTY &dev
.Ft int
.Fn ioctl fd SNPGTTY &snptty
.Fn ioctl fd SNPGTTY &dev
.Ft int
.Fn ioctl fd FIONREAD 0
.Fn ioctl fd FIONREAD &result
.Sh DESCRIPTION
/dev/snp? are snoop devices which allow user to attach to any tty
and watch activities on it.
@ -25,21 +26,10 @@ To associate a given
device with a tty to be observed, open the
.Nm snp
device and then use the SNPSTTY ioctl.
The argument passed to the IOCTL is the address of a structure of
the following type:
.Bd -literal -ffset indent
struct snptty {
int st_unit; /* number of the tty unit */
int st_type; /* type of the tty to attach */
#define ST_PTY 0 /* regular pty */
#define ST_VTY 1 /* syscons vty */
#define ST_SIO 2 /* serial lines */
}
.Ed
.Pp
By setting st_type or st_unit to -1, the user may detach the snp device
for a tty.
The argument passed to the IOCTL is the address of a variable of type
dev_t.
By setting the value of the variable pointed to to -1, the user may detach
the snp device from a tty.
.Pp
The SNPGTTY ioctl returns information about the current tty attached to
the open