This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
#include <termios.h> pid_t tcgetsid(int fildes);
The tcgetsid() function shall obtain the process group ID of the session for which the terminal specified by fildes is the controlling terminal.
Upon successful completion, tcgetsid() shall return the process group ID of the session associated with the terminal. Otherwise, a value of -1 shall be returned and errno set to indicate the error.
The tcgetsid() function shall fail if:
The fildes argument is not a valid file descriptor.
The calling process does not have a controlling terminal, or the file is not the controlling terminal.
The following sections are informative.
The Base Definitions volume of POSIX.1-2017, <termios.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .
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