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32 .\" @(#)ttyname.3 8.1 (Berkeley) 6/4/93
43 .Nd get name of associated terminal (tty) from file descriptor
51 .Fn ttyname_r "int fd" "char *buf" "size_t len"
57 These functions operate on the system file descriptors for terminal
59 These descriptors are not related to the standard
62 typedef, but refer to the special device files found in
66 and for which an entry exists
67 in the initialization file
75 determines if the file descriptor
83 gets the related device name of
84 a file descriptor for which
91 returns the name stored in a static buffer which will be overwritten
96 takes a buffer and length as arguments to avoid this problem.
101 fetches the current process' control terminal number from the
108 returns the null terminated name if the device is found and
116 function returns 0 if successful.
117 Otherwise an error number is returned.
122 returns the unit number of the device file if found; otherwise
123 the value zero is returned.
125 .Bl -tag -width ".Pa /etc/ttys" -compact
132 may fail and return the following error codes:
138 is not a valid file descriptor.
143 is smaller than the length of the string to be returned.