4.4BSD/usr/share/man/cat2/ioctl.0

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IOCTL(2)                    BSD Programmer's Manual                   IOCTL(2)

NNAAMMEE
     iiooccttll - control device

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssyyss//iiooccttll..hh>>

     _i_n_t
     iiooccttll(_i_n_t _d, _u_n_s_i_g_n_e_d _l_o_n_g _r_e_q_u_e_s_t, _c_h_a_r _*_a_r_g_p);

DDEESSCCRRIIPPTTIIOONN
     The iiooccttll() function manipulates the underlying device parameters of spe-
     cial files.  In particular, many operating characteristics of character
     special files (e.g. terminals) may be controlled with iiooccttll() requests.
     The argument _d must be an open file descriptor.

     An  ioctl _r_e_q_u_e_s_t has encoded in it whether the argument is an ``in'' pa-
     rameter or ``out'' parameter, and the size of the argument _a_r_g_p in bytes.
     Macros and defines used in specifying an ioctl _r_e_q_u_e_s_t are located in the
     file <_s_y_s_/_i_o_c_t_l_._h>.

RREETTUURRNN VVAALLUUEESS
     If an error has occurred, a value of -1 is returned and _e_r_r_n_o is set to
     indicate the error.

EERRRROORRSS
     IIooccttll() will fail:

     [EBADF]   _d is not a valid descriptor.

     [ENOTTY]  _d is not associated with a character special device.

     [ENOTTY]  The specified request does not apply to the kind of object that
               the descriptor _d references.

     [EINVAL]  _R_e_q_u_e_s_t or _a_r_g_p is not valid.

SSEEEE AALLSSOO
     mt(1),  execve(2),  fcntl(2),  tty(4),  intro(4)

HHIISSTTOORRYY
     An iiooccttll function call appeared in Version 7 AT&T UNIX.

4th Berkeley Distribution        June 4, 1993                                1