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28 .\" @(#)ttyname.3 8.1 (Berkeley) 6/4/93
39 .Nd get name of associated terminal (tty) from file descriptor
47 .Fn ttyname_r "int fd" "char *buf" "size_t len"
53 These functions operate on the system file descriptors for terminal
55 These descriptors are not related to the standard
58 typedef, but refer to the special device files found in
62 and for which an entry exists
63 in the initialization file
71 determines if the file descriptor
79 gets the related device name of
80 a file descriptor for which
87 returns the name stored in a static buffer which will be overwritten
92 takes a buffer and length as arguments to avoid this problem.
97 fetches the current process' control terminal number from the
104 returns the null terminated name if the device is found and
112 function returns 0 if successful.
113 Otherwise an error number is returned.
118 returns the unit number of the device file if found; otherwise
119 the value zero is returned.
121 .Bl -tag -width ".Pa /etc/ttys" -compact
128 may fail and return the following error codes:
134 is not a valid file descriptor.
139 is smaller than the length of the string to be returned.