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fcntl(5)							      fcntl(5)


NAME    [Toc]    [Back]

     fcntl - file control options

SYNOPSIS    [Toc]    [Back]

     #include <fcntl.h>

DESCRIPTION    [Toc]    [Back]

     The fcntl.h header	defines	the following requests and arguments for use
     by	the functions fcntl (see fcntl(2)) and open (see open(2)).

     Values for	cmd used by fcntl (the following values	are unique):
	 F_DUPFD	     Duplicate file descriptor
	 F_GETFD	     Get file descriptor flags
	 F_SETFD	     Set file descriptor flags
	 F_GETFL	     Get file status flags
	 F_SETFL	     Set file status flags
	 F_GETLK	     Get record	locking	information
	 F_SETLK	     Set record	locking	information
	 F_SETLKW	     Set record	locking	information;
			     wait if blocked
	 F_ALLOCSP	     Allocate file space
	 F_ALLOCSP	     Allocate 64-bit file space
	 F_FREESP	     Free file space
	 F_FREESP	     Free 64-bit file space
	 F_SETBSDLK	     Set BSD record locking information
	 F_SETBSDLKW	     Set BSD record locking information;
			     wait if blocked
	 F_DIOINFO	     Get direct	I/O parameters
	 F_RSETLK	     Remote SETLK for NFS
	 F_RGETLK	     Remote GETLK for NFS
	 F_RSETLKW	     Remote SETLKW for NFS
	 F_GETOWN	     Get owner (socket emulation)
	 F_SETOWN	     Set owner (socket emulation)
	 F_SETTRANSFER	     Set transfer context for data pipe
	 F_DESTROYTRANSFER   Destroy transfer context for data pipe
	 F_ALLOCSP64	     Allocate file space
	 F_FREESP64	     Free file space
	 F_GETLK64	     Get record	locking	information
	 F_SETLK64	     Set record	locking	information
	 F_SETLKW64	     Set record	locking	information;
			     wait if blocked
	 F_RESVSP	     Reserve file space
	 F_UNRESVSP	     Unreserve file space
	 F_RESVSP64	     Reserve file space
	 F_UNRESVSP64	     Unreserve file space
	 F_FSGETXATTRA	     Get extended attributes
	 F_FSYNC	     Flush a file range
	 F_FSYNC64	     Flush a 64-bit file range
	 F_GETBIOSIZE	     Get the preferred buffer I/O sizes
	 F_SETBIOSIZE	     Set the preferred buffer I/O sizes





									Page 1






fcntl(5)							      fcntl(5)



     File descriptor flags used	for fcntl:
	 FD_CLOEXEC	     Close the file descriptor upon
			     execution of an exec function [see	exec(2)]

     File status flags used for	open and fcntl:
	 O_NDELAY	     Non-blocking I/O
	 O_APPEND	     Append
	 O_SYNC		     Synchronous write option
	 O_DSYNC	     Synchronous write option for data
	 O_RSYNC	     Synchronous data integrity	read
	 FASYNC		     Interrupt-driven I/O for sockets
	 O_NONBLOCK	     Non-blocking I/O
	 O_LCFLUSH	     Flush cache on last close
	 O_LCINVAL	     Flush and invalidate cache	on last	close

     Values for	l_type used for	record locking with fcntl
     (the following values are unique):
	 F_RDLCK	     Shared or read lock
	 F_UNLCK	     Unlock
	 F_WRLCK	     Exclusive or write	lock

     Values for	oflag used by open:
	 O_CREAT	     Create file if it does not	exist
	 O_EXCL		     Exclusive use flag
	 O_NOCTTY	     Do	not assign controlling tty
	 O_TRUNC	     Truncate flag
	 O_DIRECT	     Direct I/O
	 O_LARGEFILE	     Allow large file opens

     Mask for use with file access modes:
	 O_ACCMODE	     Mask for file access modes

     File access modes used for	open and fcntl:
	 O_RDONLY	     Open for reading only
	 O_RDWR		     Open for reading and writing
	 O_WRONLY	     Open for writing only

     The constants used	for file modes are defined to have the same values as
     in	sys/stat.h.  These constants exist in fcntl.h also in order to comply
     with the XPG4 standards.

	  #define S_ISUID     /* set user id on	execution */
	  #define S_ISGID     /* set group id on execution */
	  #define S_IRWXU     /* read, write, execute: owner */
	  #define S_IRUSR     /* read permission: owner	*/
	  #define S_IWUSR     /* write permission: owner */
	  #define S_IXUSR     /* execute permission: owner */
	  #define S_IRWXG     /* read, write, execute: group */
	  #define S_IRGRP     /* read permission: group	*/
	  #define S_IWGRP     /* write permission: group */
	  #define S_IXGRP     /* execute permission: group */
	  #define S_IRWXO     /* read, write, execute: other */



									Page 2






fcntl(5)							      fcntl(5)



	  #define S_IROTH     /* read permission: other	*/
	  #define S_IWOTH     /* write permission: other */
	  #define S_IXOTH     /* execute permission: other */


     The constants used	for the	lseek routine are defined to have the same
     values as in unistd.h.  These constants exist in fcntl.h also in order to
     comply with the XPG4 standards.

	  #define SEEK_SET     /* Set file pointer to "offset" */
	  #define SEEK_CUR     /* Set file pointer to current plus"offset" */
	  #define SEEK_END     /* Set file pointer to EOF plus"offset" */


     The structure flock describes a file lock.	 It includes the following
     members:

	  short	  l_type;     /* Type of lock */
	  short	  l_whence;   /* Flag for starting offset */
	  off_t	  l_start;    /* Relative offset in bytes */
	  off_t	  l_len;      /* Size; if 0 then until EOF */
	  long	  l_sysid;    /* Returned with F_GETLK */
	  pid_t	  l_pid;      /* Returned with F_GETLK */


     The structure flock64 describes a file lock for use on large files.  It
     includes the following members:

	  short	  l_type;     /* Type of lock */
	  short	  l_whence;   /* Flag for starting offset */
	  off64_t l_start;    /* Relative offset in bytes */
	  off64_t l_len;      /* Size; if 0 then until EOF */
	  long	  l_sysid;    /* Returned with F_GETLK */
	  pid_t	  l_pid;      /* Returned with F_GETLK */


     The structure biosize is used to pass information about the preferred I/O
     sizes used	for a file.  It	contains the following members:

	  __uint32_t biosz_flags;     /* 1 if defaults are overridden */
	  __int32_t  biosz_read;      /* all values specified as log */
	  __int32_t  biosz_write;     /*     base2 of the true length */
	  __int32_t  dfl_biosz_read;  /* Returned with F_GETBIOSIZE */
	  __int32_t  dfl_biosz_write; /* Returned with F_GETBIOSIZE */

SEE ALSO    [Toc]    [Back]

      
      
     creat(2), exec(2),	fcntl(2), open(2)


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