03-26-2017
3 tests.
Does this occur at a character session at the console?
Does it occur at a graphical session on the console, and finally does it work at a terminal emulation session?
Assuming that this is all on SCO.
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LEARN ABOUT FREEBSD
tcsetsid
TCSETSID(3) BSD Library Functions Manual TCSETSID(3)
NAME
tcsetsid -- set session ID associated with a controlling terminal
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#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.
BSD
May 4, 2009 BSD