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.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The tcgetsid() function is thread-safe.

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 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



GNU                                         2014-01-13                                TCGETSID(3)