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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 3.53 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)