ttyslot(3C) manual page
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ttyslot - find the slot in the utmp file of the current user
#include <stdlib.h>
int ttyslot(void);
Safe
ttyslot()
returns the index of the current user’s entry in the /var/adm/utmp file.
The returned index is accomplished by scanning files in /dev for the name
of the terminal associated with the standard input, the standard output,
or the standard error output (0, 1, or 2).
A value of -1 is
returned if an error was encountered while searching for the terminal name
or if none of the above file descriptors are associated with a terminal
device.
/var/adm/utmp
getutent(3C)
, ttyname(3C)
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