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NAME

       tcgetsid - get session ID

SYNOPSIS

       #define _XOPEN_SOURCE 500        /* See feature_test_macros(7) */
       #include <termios.h>

       pid_t tcgetsid(int fd);

DESCRIPTION

       The  function  tcgetsid() returns the session ID of the current session
       that has the terminal associated to fd as controlling  terminal.   This
       terminal must be the controlling terminal of the calling process.

RETURN VALUE

       When fd refers to the controlling terminal of our session, the function
       tcgetsid() will return the session ID of this session.   Otherwise,  -1
       is returned, and errno is set appropriately.

ERRORS

       EBADF  fd is not a valid file descriptor.

       ENOTTY The  calling process does not have a controlling terminal, or it
              has one but it is not described by fd.

VERSIONS

       tcgetsid() is provided in glibc since version 2.1.

CONFORMING TO

       POSIX.1-2001.

NOTES

       This function is implemented via the TIOCGSID ioctl(2),  present  since
       Linux 2.1.71.

SEE ALSO

       getsid(2)

COLOPHON

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