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TCSETSID(3) FreeBSD Library Functions Manual TCSETSID(3)
NAME
tcsetsid - set session ID associated with a controlling terminal
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <termios.h>
int
tcsetsid(int fd, pid_t pid);
DESCRIPTION
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
terminal.
ERRORS
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
terminal.
[EINVAL] The pid argument is not equal to the session ID of the
calling process.
[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.
SEE ALSO
getsid(2), setsid(2), tcgetpgrp(3), tcgetsid(3)
HISTORY
A tcsetsid() function first appeared in QNX. It does not comply to any
standard.
FreeBSD 14.0-RELEASE-p11 November 28, 2022 FreeBSD 14.0-RELEASE-p11