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$FreeBSD$
.Dd May 4, 2009 .Dt TCSETSID 3 .Os .Sh NAME .Nm tcsetsid .Nd set session ID associated with a controlling terminal .Sh LIBRARY .Lb libc .Sh SYNOPSIS n sys/types.h n termios.h .Ft int .Fn tcsetsid "int fd" "pid_t pid" .Sh DESCRIPTION The .Fn tcsetsid function sets associates a session identified by .Fa pid with a controlling terminal specified by .Fa fd .
p This implementation only allows the controlling terminal to be changed by the session leader itself. This implies that .Fa pid always has to be equal to the process ID.
p It is unsupported to associate with a terminal that already has an associated session. Conversely, it is also unsupported to associate to a terminal when the session is already associated with a different terminal. .Sh ERRORS If an error occurs, .Fn tcsetsid returns -1 and the global variable .Va errno is set to indicate the error, as follows: l -tag -width Er t Bq Er EBADF The .Fa fd argument is not a valid file descriptor. t Bq Er ENOTTY The file descriptor represented by .Fa fd is not a terminal. t Bq Er EINVAL The .Fa pid argument is not equal to the session ID of the calling process. t Bq Er EPERM The calling process is not a session leader. t Bq Er EPERM The session already has an associated terminal or the terminal already has an associated session. .El .Sh SEE ALSO .Xr getsid 2 , .Xr setsid 2 , .Xr tcgetpgrp 3 , .Xr tcgetsid 3 .Sh HISTORY A .Fn tcsetsid function first appeared in QNX. It does not comply to any standard.