TCGETSIDSection: Linux Programmer's Manual (3)
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NAMEtcgetsid - get session ID
SYNOPSIS#define _XOPEN_SOURCE 500
DESCRIPTIONThe 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 VALUEWhen 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.
- fd is not a valid file descriptor.
- The calling process does not have a controlling terminal, or it has one but it is not described by fd.
VERSIONStcgetsid() is provided in glibc since version 2.1.
NOTESThis function is implemented via the TIOCGSID ioctl(2), present since Linux 2.1.71.
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.