tcgetsid(3C)

NAME

tcgetsid() − get terminal session ID

SYNOPSIS

#include <termios.h>

pid_t tcgetsid (int fildes);

DESCRIPTION

The tcgetsid() function returns the value of the session ID of the foreground process associated with the terminal referenced by fildes. tcgetsid() is allowed from a process that is a member of a background process group (see termio(7)).

RETURN VALUE

Upon successful completion, tcgetsid() returns the value of the session ID of the foreground process associated with the terminal referenced by fildes. Otherwise, tcgetsid() returns a value of −1 and sets errno to indicate the error.

ERRORS

If the tcgetsid() function fails, it sets errno (see errno(2)) to one of the following values:

[EACCES] The file associated with fildes is the controlling terminal of the calling process; however, there is no foreground process group defined for the controlling terminal.

[EBADF] fildes is not a valid file descriptor.

[ENOTTY] The file associated with fildes is not the controlling terminal or the calling process does not have a controlling terminal.

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