Unix/Linux Go Back    

RedHat 9 (Linux i386) - man page for fsync (redhat section 2)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

FSYNC(2)			    Linux Programmer's Manual				 FSYNC(2)

       fsync, fdatasync - synchronize a file's complete in-core state with that on disk

       #include <unistd.h>

       int fsync(int fd);

       int fdatasync(int fd);

       fsync  copies all in-core parts of a file to disk, and waits until the device reports that
       all parts are on stable storage.  It also updates metadata stat information. It	does  not
       necessarily  ensure  that  the entry in the directory containing the file has also reached
       disk.  For that an explicit fsync on the file descriptor of the directory is also needed.

       fdatasync does the same as fsync but only flushes user data, not the meta  data	like  the
       mtime or atime.

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

       EBADF  fd is not a valid file descriptor open for writing.

	      fd is bound to a special file which does not support synchronization.

       EIO    An error occurred during synchronization.

       In  case  the  hard  disk has write cache enabled, the data may not really be on permanent
       storage when fsync/fdatasync return.

       When an ext2 file system is mounted with the  sync  option,  directory  entries	are  also
       implicitly synced by fsync.

       On  kernels before 2.4, fsync on big files can be inefficient.  An alternative might be to
       use the O_SYNC flag to open(2).

       POSIX.1b (formerly POSIX.4)

       bdflush(2), open(2), sync(2), mount(8), update(8), sync(8)

Linux 1.3.85				    2001-04-18					 FSYNC(2)
Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums

All times are GMT -4. The time now is 02:48 AM.