tcgetsid man page on CentOS

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

NAME
       tcgetsid - get session ID

SYNOPSIS
       #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.

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

CONFORMING TO
       POSIX.1-2001

SEE ALSO
       getsid(2)

POSIX				  2003-01-30			   TCGETSID(3)
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