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TCGETSID(3) BSD Library Functions Manual TCGETSID(3)
tcgetsid -- get session ID associated with a controlling terminal
Standard C Library (libc, -lc)
The tcgetsid function returns the value of the session ID associated with the specified con-
trolling terminal device. The session ID is defined as the process group ID of the session
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 underly-
ing terminal device represented by fd is not the controlling terminal.
getsid(2), setsid(2), tcgetpgrp(3)
The tcgetsid function conforms to X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'').
BSD February 13, 1998 BSD
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