tcgetpgrp - get foreground process group ID
Standard C Library (libc, -lc)
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 terminal
or the underlying terminal device represented by
fd is not the controlling terminal.
setpgid(2), setsid(2), tcsetpgrp(3)
The tcgetpgrp function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
BSD June 4, 1993 BSD
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