tcgetsid() -- get process group ID of terminal session

SYNOPSIS

#include <termios.h>

pid_t tcgetsid(int fildes);

DESCRIPTION

The tcgetsid() function returns the value of the process group ID of the session associated with the terminal.

PARAMETERS

fildes: Is the file descriptor, which must refer to a terminal.

RETURN VALUES

If successful, tcgetsid() returns the process group ID of the session associated with the terminal. Otherwise, it returns -1 and sets errno one of the following values:

EBADF: The fildes parameter is not a valid file descriptor.
ENOTTY: The calling process does not have a controlling terminal, or the file is not the controlling terminal.