Manpages - tcgetsid.3

tcgetsid - get session ID

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

  pid_t tcgetsid(int fd);

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.

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 to indicate the error.

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.

*tcgetsid*() is provided in glibc since version 2.1.

For an explanation of the terms used in this section, see *attributes*(7).

POSIX.1-2001, POSIX.1-2008.

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

*getsid*(2)

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