|| FreeBSD Library Functions Manual
set foreground process group ID
Standard C Library (libc, -lc)
DESCRIPTION If the process has a controlling terminal, the
tcsetpgrp() function sets the foreground process group ID associated with the terminal device to
pgrp_id. The terminal device associated with
fd must be the controlling terminal of the calling process and the controlling terminal must be currently associated with the session of the calling process. The value of
pgrp_id must be the same as the process group ID of a process in the same session as the calling process.
RETURN VALUES The
tcsetpgrp() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable
errno is set to indicate the error.
() function will fail if:
fd argument is not a valid file descriptor.
An invalid value of
pgrp_id was specified.
The calling process does not have a controlling terminal, or the file represented by
fd is not the controlling terminal, or the controlling terminal is no longer associated with the session of the calling process.
pgrp_id argument does not match the process group ID of a process in the same session as the calling process.
tcsetpgrp() function is expected to be compliant with the IEEE Std 1003.1-1988 (“POSIX.1”) specification.