tcgetsid - get the process group ID for the session leader for the controlling terminal
pid_t tcgetsid(int fildes);
The tcgetsid() function shall obtain the process group ID of the session for which the terminal specified by fildes is the controlling terminal.
Upon successful completion, tcgetsid() shall return the process group ID of the session associated with the terminal. Otherwise, a value of -1 shall be returned and errno set to indicate the error.
The tcgetsid() function shall fail if:
- The fildes argument is not a valid file descriptor.
- The calling process does not have a controlling terminal, or the file is not the controlling terminal.
First released in Issue 4, Version 2.
Moved from X/OPEN UNIX extension to BASE.
The [EACCES] error has been removed from the list of mandatory errors, and the description of [ENOTTY] has been reworded.
SD5-XSH-ERN-180 is applied, clarifying the RETURN VALUE section.
The tcgetsid() function is moved from the XSI option to the Base.
POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0648  is applied.
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