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