TTYSLOT.3
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操作系统开发
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C/C++
- TTYSLOT(3) Minix Programmer's Manual TTYSLOT(3)
- NAME
- ttyslot, fttyslot - utmp slot number
- SYNOPSIS
- #define _MINIX_SOURCE 1
- #include <unistd.h>
- int ttyslot(void)
- int fttyslot(int fd)
- DESCRIPTION
- Ttyslot() returns the index of the login terminal in the utmp file. It
- tries fttyslot() on file descriptors 0, 1, and 2 to find the index.
- Fttyslot() returns the utmp index of the terminal associated with file
- descriptor fd. First it tries to map fd to a terminal name with
- ttyname(3), then it searches the ttytab(5) database with the getttyent(3)
- function for this terminal. This means that the utmp slot number is the
- same as the ttytab entry number counting from 1. The value 0 is returned
- if no slot number can be found for a file descriptor.
- SEE ALSO
- ttyname(3), getttyent(3), utmp(5), ttytab(5), init(8).
- NOTES
- Since 0 is used as an error return this means that the first entry in the
- utmp file is not used.
- Ttyslot() is often found in a UNIX implementation, fttyslot() is Minix
- specific.
- AUTHOR
- Kees J. Bot (kjb@cs.vu.nl)
- 1