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32 .Nd set session ID associated with a controlling terminal
39 .Fn tcsetsid "int fd" "pid_t pid"
43 function sets associates a session identified by
45 with a controlling terminal specified by
48 This implementation only allows the controlling terminal to be changed
49 by the session leader itself.
52 always has to be equal to the process ID.
54 It is unsupported to associate with a terminal that already has an
56 Conversely, it is also unsupported to associate to a terminal when
57 the session is already associated with a different terminal.
61 returns -1 and the global variable
63 is set to indicate the error, as follows:
68 argument is not a valid file descriptor.
70 The file descriptor represented by
76 argument is not equal to the session ID of the calling process.
78 The calling process is not a session leader.
80 The session already has an associated terminal or the terminal already
81 has an associated session.
91 function first appeared in QNX.
92 It does not comply to any standard.