fcntl(5)                                                 fcntl(5)



     NAME
          fcntl - file control options

     SYNOPSIS
          #include <fcntl.h>

     DESCRIPTION
          The fcntl(2) function provides for control over open files.
          The include file describes requests 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   O_RDONLY  0
          #define   O_WRONLY  1
          #define   O_RDWR    2
          #define   O_NDELAY  04   /* Non-blocking I/O */
          #define   O_APPEND  010  /* append (writes
                                           guaranteed at the end) */

          /* Flag values accessible only to open(2) */
          #define   O_CREAT   00400     /* open with file create
                                        (uses third open arg) */
          #define   O_TRUNC   01000     /* open with truncation */
          #define   O_EXCL    02000     /* exclusive open */

          /* fcntl(2) requests */
          #define   F_DUPFD   0    /* Duplicate fildes */
          #define   F_GETFD   1    /* Get fildes flags */
          #define   F_SETFD   2    /* Set fildes flags */
          #define   F_GETFL   3    /* Get file flags */
          #define   F_SETFL   4    /* Set file flags */
          #define   F_GETLK   5    /* Get blocking file locks */
          #define   F_SETLK   6    /* Set or clear file locks
                                        and fail on busy */
          #define   F_SETLKW 7     /* Set or clear file locks
                                        and wait on busy */
          #define   F_GETOWN 8     /* Get owner */
          #define   F_SETOWN 9     /* Set owner */

          /* file segment locking control structure */
          struct flock {
          short          l_type;
          short          l_whence;
          long      l_start;
          long      l_len;    /* if 0 then until EOF */
          int       l_pid;    /* returned with F_GETLK */

          /* file segment locking types */
          #define   F_RDLCK   01   /* Read lock */
          #define   F_WRLCK   02   /* Write lock */



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     fcntl(5)                                                 fcntl(5)



          #define   F_UNLCK   03   /* Remove locks */

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



















































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