debian man page for tcgetsid

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.

CONFORMING TO
       POSIX.1-2001.

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 3.44 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/.

GNU
								    2010-09-10							       TCGETSID(3)