DragonFly On-Line Manual Pages
TCSETSID(3) DragonFly Library Functions Manual TCSETSID(3)
tcsetsid -- set session ID associated with a controlling terminal
Standard C Library (libc, -lc)
tcsetsid(int fd, pid_t pid);
The tcsetsid() function sets associates a session identified by pid with
a controlling terminal specified by fd.
This implementation only allows the controlling terminal to be changed by
the session leader itself. This implies that pid always has to be equal
to the process ID.
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
If an error occurs, tcsetsid() returns -1 and the global variable errno
is set to indicate the error, as follows:
[EBADF] The fd argument is not a valid file descriptor.
[ENOTTY] The file descriptor represented by fd is not a
[EINVAL] The pid argument is not equal to the session ID of the
[EPERM] The calling process is not a session leader.
[EPERM] The session already has an associated terminal or the
terminal already has an associated session.
getsid(2), setsid(2), tcgetpgrp(3), tcgetsid(3)
A tcsetsid() function first appeared in QNX. It does not comply to any
DragonFly 5.1 May 5, 2018 DragonFly 5.1