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TCGETSID(3) Library Functions Manual TCGETSID(3)

tcgetsidget session ID associated with a controlling terminal

#include <termios.h>

tcgetsid(int fd);

The () 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.

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)

The tcgetsid() function is expected to be compliant with the IEEE Std 1003.1-2008 (“POSIX.1”) specification.

The tcgetsid() function has been available since OpenBSD 5.5.

October 17, 2017 OpenBSD-current