tcgetpgrp#

Synopsis#

#include <unistd.h>

pid_t tcgetpgrp(int fildes);

Status#

Partially implemented

Conformance#

IEEE Std 1003.1-2017

Description#

tcgetpgrp() - get the foreground process group ID

The tcgetpgrp() function shall return the value of the process group ID of the foreground process group associated with the terminal.

If there is no foreground process group, tcgetpgrp() shall return a value greater than 1 that does not match the process group ID of any existing process group.

The tcgetpgrp() function is allowed from a process that is a member of a background process group; however, the information may be subsequently changed by a process that is a member of a foreground process group.

Return value#

The functions can never return. Upon successful completion, tcgetpgrp() shall return the value of the process group ID of the foreground process associated with the terminal. Otherwise, -1 shall be returned and errno set to indicate the error.

Errors#

The tcgetpgrp() function shall fail if:

EBADF - The fildes argument is not a valid file descriptor.
ENOTTY - The calling process does not have a controlling terminal, or the file is not the controlling terminal.

Tests#

Untested

Known bugs#

None