fcntl(5)                       DG/UX 5.4R3.00                       fcntl(5)


NAME
       fcntl - file control options

SYNOPSIS
       #include <fcntl.h>

DESCRIPTION
       The fcntl(2) function helps you control open files.  This include
       file describes commands and arguments to fcntl and open(2).

       /* Flag values accessible to open(2) and fcntl(2) */
       /* (The first three can only be set by open) */

       #define ORDONLY   0
       #define OWRONLY   1
       #define ORDWR     2
       #define ONDELAY   04   /* Non-blocking I/O */
       #define OAPPEND   010  /* append (writes guaranteed at the end) */

       /* Flag values accessible only to open(2) */
       #define OCREAT 00400   /* open with file create (uses 3rd open arg)*/
       #define OTRUNC 01000   /* open with truncation */
       #define OEXCL  02000   /* exclusive open */

       /* fcntl(2) commands */
       #define FDUPFD   0     /* Duplicate fildes */
       #define FGETFD   1     /* Get the `close-on-exec' flag */
       #define FSETFD   2     /* Set the `close-on-exec' flag */
       #define FGETFL   3     /* Get file flags */
       #define FSETFL   4     /* Set file flags */
       #define FGETLK   5     /* Get record lock status */
       #define FSETLK   6     /* Set record lock or fail */
       #define FSETLKW  7     /* Set record lock or pend */
       #define FCHKFL   8     /* Check flags for validity */
       #define FFREESP  11    /* Free up file space */
       #define FGETOWN  65536 /* Get owner of fildes */
       #define FSETOWN  65537 /* Set owner of fildes */

SEE ALSO
       fcntl(2), open(2).

















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