


      TRUNCATE(2)                 (bsd 4.2)                 TRUNCATE(2)



      NAME
           truncate, ftruncate - truncate a file to a specified length

      SYNTAX
           truncate(path, length)
           char *path;
           int length;

           ftruncate(fd, length)
           int fd, length;

      DESCRIPTION
           Truncate causes the file named by path or referenced by fd
           to be truncated to at most length bytes in size.  If the
           file previously was larger than this size, the extra data is
           lost.  With ftruncate, the file must be open for writing.

      RETURN VALUES
           A value of 0 is returned if the call succeeds.  If the call
           fails a -1 is returned, and the global variable errno
           specifies the error.

      ERRORS
           Truncate succeeds unless:

           [EPERM]        The pathname contains a character with the
                          high-order bit set.

           [ENOENT]       The pathname was too long.

           [ENOTDIR]      A component of the path prefix of path is not
                          a directory.

           [ENOENT]       The named file does not exist.

           [EACCES]       A component of the path prefix denies search
                          permission.

           [EISDIR]       The named file is a directory.

           [EROFS]        The named file resides on a read-only file
                          system.

           [ETXTBSY]      The file is a pure procedure (shared text)
                          file that is being executed.

           [EFAULT]       Name points outside the process's allocated
                          address space.

           Ftruncate succeeds unless:

           [EBADF]        The fd is not a valid descriptor.



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      TRUNCATE(2)                 (bsd 4.2)                 TRUNCATE(2)



           [EINVAL]       The fd references a socket, not a file.

      SEE ALSO
           open(2)

      BUGS
           Partial blocks discarded as the result of truncation are not
           zero filled; this can result in holes in files which do not
           read as zero.

           These calls should be generalized to allow ranges of bytes
           in a file to be discarded.











































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