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.

ATTRIBUTES
       For an  explanation  of  the  terms  used  in  this  section,  see  at-
       tributes(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
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       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)