TCGETSID(3) | 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”).

February 13, 1998 | NetBSD 9.5