SYNOPSIS

     #include <sys/types.h>
     #include <unistd.h>

     int
     tcsetpgrp(int fd, pid_t pgrp_id);

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 cur-
     rently 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.

ERRORS

     The tcsetpgrp() function will fail if:

     [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 termi-
                        nal, or the file represented by fd is not the control-
                        ling terminal, or the controlling terminal is no
                        longer associated with the session of the calling
                        process.

     [EPERM]            The pgrp_id argument does not match the process group
                        ID of a process in the same session as the calling
                        process.

SEE ALSO

     setpgid(2), setsid(2), tcgetpgrp(3)

STANDARDS

     The tcsetpgrp() function is expected to be compliant with the IEEE Std
     1003.1-1988 (``POSIX.1'') specification.

BSD                              June 4, 1993                              BSD