tcgetsid(3) - BetterMan

tcgetsid(3)

get session ID

distropkg manpages-dev@6.9.1-1dataset 2026-04-01T06:19:02Z+debian+ec4110e+mandoc:1.14.6-4

Synopsis

#define _XOPEN_SOURCE 500
        /* See feature_test_macros(7) */
#include <termios.h>
pid_t tcgetsid(int 
fd
);

—

Options · 2

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.

SYNOPSIS

bash

#define _XOPEN_SOURCE 500\n        /* See feature_test_macros(7) */
\n#include <termios.h>

bash

pid_t tcgetsid(int \nfd\n);

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 to indicate the error.

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.