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TCGETSID(3)                Library Functions Manual                TCGETSID(3)

NAME
     tcgetsid - get session ID associated with a controlling terminal

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <termios.h>

     pid_t
     tcgetsid(int fd);

DESCRIPTION
     The tcgetsid function returns the value of the session ID associated with
     the specified controlling terminal device.  The session ID is defined as
     the process group ID of the session leader.

ERRORS
     If an error occurs, tcgetsid returns -1 and the global variable errno is
     set to indicate the error, as follows:

     [EBADF]            The fd argument is not a valid file descriptor.

     [ENOTTY]           The calling process does not have a controlling
                        terminal or the underlying terminal device represented
                        by fd is not the controlling terminal.

SEE ALSO
     getsid(2), setsid(2), tcgetpgrp(3)

STANDARDS
     The tcgetsid function conforms to X/Open Portability Guide Issue 4,
     Version 2 ("XPG4.2").

NetBSD 10.99                   December 19, 2019                  NetBSD 10.99