TCGETSID(3) BSD Library Functions Manual TCGETSID(3)
NAME
tcgetsid -- get session ID associated with a controlling terminal
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <unistd.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'').
BSD
February 13, 1998 BSD
