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

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       information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.