TCGETSID(3)		   Linux Programmer's Manual		   TCGETSID(3)



NAME
       tcgetsid - get session ID

SYNOPSIS
       #define _XOPEN_SOURCE 500	/* See feature_test_macros(7) */
       #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.

VERSIONS
       tcgetsid() is provided in glibc since version 2.1.

ATTRIBUTES
       For  an	explanation  of	 the  terms  used   in	 this	section,   see
       attributes(7).

       +-----------+---------------+---------+
       |Interface  | Attribute	   | Value   |
       +-----------+---------------+---------+
       |tcgetsid() | Thread safety | MT-Safe |
       +-----------+---------------+---------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

NOTES
       This  function  is implemented via the TIOCGSID ioctl(2), present since
       Linux 2.1.71.

SEE ALSO
       getsid(2)

COLOPHON
       This page is part of release 4.10 of the Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       https://www.kernel.org/doc/man-pages/.



GNU				  2015-08-08			   TCGETSID(3)