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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
60 and for which an entry exists
61 in the initialization file
70 determines if the file descriptor
78 gets the related device name of
79 a file descriptor for which
86 returns the name stored in a static buffer which will be overwritten
91 takes a buffer and length as arguments to avoid this problem.
96 fetches the current process' control terminal number from the
103 returns the null terminated name if the device is found and
111 function returns 0 if successful.
112 Otherwise an error number is returned.
117 returns the unit number of the device file if found; otherwise
118 the value zero is returned.
120 .Bl -tag -width ".Pa /etc/ttys" -compact
127 may fail and return the following error codes:
133 is not a valid file descriptor.
138 is smaller than the length of the string to be returned.