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Linux 2.6 - man page for tcgetsid (linux section 3)

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 termi-
       nal associated to fd as controlling terminal.  This terminal must be the controlling  ter-
       minal 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 appro-
       priately.

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 3.55 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)


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