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Man Pages
TCGETSID(3) FreeBSD Library Functions Manual TCGETSID(3)

tcgetsid —
get session ID associated with a controlling terminal

Standard C Library (libc, -lc)

#include <sys/types.h>
#include <termios.h>

pid_t
tcgetsid(int fd);

The tcgetsid() function returns the process group ID of the session leader for a controlling terminal specified by fd.

If an error occurs, tcgetsid() returns -1 and the global variable errno is set to indicate the error, as follows:
[]
The fd argument is not a valid file descriptor.
[]
The calling process does not have a controlling terminal or the underlying terminal device represented by fd is not the controlling terminal.

getsid(2), setsid(2), tcgetpgrp(3), tcsetsid(3)

The tcgetsid() function conforms to X/Open Portability Guide Issue 4, Version 2 (“XPG4.2”).
April 15, 2008 FreeBSD 13.1-RELEASE
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