TCGETPGRP(3) BSD Library Functions Manual TCGETPGRP(3)NAMEtcgetpgrp — get foreground process group ID
The tcgetpgrp function returns the value of the process group ID of the
foreground process group associated with the terminal device. If there
is no foreground process group, tcgetpgrp returns an invalid process ID.
If an error occurs, tcgetpgrp returns -1 and the global variable errno is
set to indicate the error, as follows:
[EBADF] The fd argument is not a valid file descriptor.
[ENOTTY] The calling process does not have a controlling termi‐
nal or the underlying terminal device represented by
fd is not the controlling terminal.
SEE ALSOsetpgid(3), setsid(2), tcsetpgrp(3)STANDARDS
The tcgetpgrp function is expected to be compliant with the IEEE Std
1003.1-1988 (“POSIX.1”) specification.
BSD February 20, 2018 BSD