TCGETSID(3) BSD Library Functions Manual TCGETSID(3)NAMEtcgetsid — 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 termi‐
nal or the underlying terminal device represented by
fd is not the controlling terminal.
SEE ALSOgetsid(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