NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON 

TCGETSID(3)               Linux Programmer's Manual              TCGETSID(3)

NAME         top

       tcgetsid - get session ID

SYNOPSIS         top

       #define _XOPEN_SOURCE 500        /* See feature_test_macros(7) */
       #include <termios.h>
       pid_t tcgetsid(int fd);

DESCRIPTION         top

       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         top

       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         top

       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         top

       tcgetsid() is provided in glibc since version 2.1.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌───────────┬───────────────┬─────────┐
       │Interface  │ Attribute     │ Value   │
       ├───────────┼───────────────┼─────────┤
       │tcgetsid() │ Thread safety │ MT-Safe │
       └───────────┴───────────────┴─────────┘

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.

NOTES         top

       This function is implemented via the TIOCGSID ioctl(2), present since
       Linux 2.1.71.

SEE ALSO         top

       getsid(2)

COLOPHON         top

       This page is part of release 4.12 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
       https://www.kernel.org/doc/man-pages/.
GNU                              2015-08-08                      TCGETSID(3)

Pages that refer to this page: setsid(2)