TCSETPGRP(3) Library Functions Manual TCSETPGRP(3)
tcsetpgrp -- set foreground process group ID
Standard C Library (libc, -lc)
tcsetpgrp(int fd, pid_t pgrp_id);
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.
Upon successful completion, tcsetpgrp returns a value of zero.
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.
[EINVAL] An invalid value of pgrp_id was specified.
[ENOTTY] 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
[EPERM] The pgrp_id argument does not match the process group
ID of a process in the same session as the calling
setpgid(2), setsid(2), tcgetpgrp(3)
The tcsetpgprp function conforms to IEEE Std 1003.1-1990 (``POSIX.1'').
NetBSD 6.1.5 June 4, 1993 NetBSD 6.1.5