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Annotation of coherent/a/usr/man/COHERENT/ioctl, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: ioctl()                COHERENT System Call               ioctl()
        !             4: 
        !             5: 
        !             6: 
        !             7: 
        !             8: Device-dependent control
        !             9: 
        !            10: iiooccttll(_f_d, _c_o_m_m_a_n_d, _i_n_f_o)
        !            11: iinntt _f_d, _c_o_m_m_a_n_d;
        !            12: cchhaarr *_i_n_f_o;
        !            13: 
        !            14: ioctl provides direct interaction with a device driver.  Possible
        !            15: uses include  setting or retrieving parameters  for devices (line
        !            16: printers,  communications   lines,  terminals)  and  non-standard
        !            17: spacing operations for tape drives.
        !            18: 
        !            19: ioctl acts upon a block  special file or a character special file
        !            20: associated  with the  already open  file descriptor  fd.  command
        !            21: points  to the  specific request.  A  system header  file defines
        !            22: symbolic command  parameters for each device  type.  For example,
        !            23: sgtty.h defines commands for terminals and mtioctl.h defines com-
        !            24: mands  for  magnetic tape  drives.   Using  the symbolic  command
        !            25: definitions  from the header  files promotes  device independence
        !            26: within  each device  type.  The  entry  for device  drivers names
        !            27: other sections that detail specific devices.
        !            28: 
        !            29: info passes a buffer of information (defined by structures in the
        !            30: appropriate  header files)  to the driver.   For any  command not
        !            31: needing additional information, this argument should be NULL.
        !            32: 
        !            33: Some ioctl requests work on all  files, and are not passed to any
        !            34: driver.   The commands  FIOCLEX and  FIONCLEX enable  and disable
        !            35: closing of the given file descriptor when an exec call completes.
        !            36: 
        !            37: ***** Files *****
        !            38: 
        !            39: <sgtty.h>
        !            40: <lpioctl.h>
        !            41: <mtioctl.h>
        !            42: 
        !            43: ***** See Also *****
        !            44: 
        !            45: COHERENT system calls, exec, getty, open(), read(), stty, write()
        !            46: 
        !            47: ***** Diagnostics *****
        !            48: 
        !            49: ioctl  returns  -1 on  errors,  such as  a  bad file  descriptor.
        !            50: Because  the call  is device  dependent,  almost any  other error
        !            51: could be returned.
        !            52: 
        !            53: ***** Notes *****
        !            54: 
        !            55: The type  of the  info argument  to ioctl is  declared as  char *
        !            56: mainly for portability  reasons.  In most cases, the actual argu-
        !            57: ment type  will be something  like struct sgttyb  *, depending on
        !            58: the particular device and command.  The actual argument should be
        !            59: cast to type char * to ensure cross-machine portability.
        !            60: 
        !            61: 
        !            62: 
        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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