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tcgetsid(3) -- Linux man page
NAME
tcgetsid - get session ID
SYNOPSIS
#include <termios.h>
pid_t tcgetsid(int fd);
DESCRIPTION
The function
tcgetsid()
returns the session ID of the current session that has the
terminal associated to
fd
as controlling terminal.
This terminal must be the controlling terminal of the calling process.
RETURN VALUE
When
fd
refers to the controlling terminal of our session,
the function
tcgetsid()
will return the session ID of this session.
Otherwise, -1 is returned, and
errno
is set appropriately.
ERRORS
- EBADF
-
fd
is not a valid file descriptor.
- ENOTTY
-
The calling process does not have a controlling terminal, or
it has one but it is not described by
fd.
NOTES
This function is implemented via the TIOCGSID ioctl, present
since Linux 2.1.71.
CONFORMS TO
POSIX 1003.1-2001
SEE ALSO
getsid(2)
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