ftruncate man page on Ultrix

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truncate(2)							   truncate(2)

       truncate, ftruncate - truncate a file to a specified length

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

       ftruncate(fd, length)
       int fd, length;

       The system call 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 the file must
       be open for writing.

Return Values
       A value of zero (0) is returned if the  call  succeeds.	 If  the  call
       fails,  a  -1  is returned, and the global variable errno specifies the

       Partial blocks discarded as the result  of  truncation  are  not	 zero-
       filled. This can result in holes in files that do not read as zero.

       The system call succeeds unless:

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

       [ENOENT]	      The named file does not exist.

       [EACCES]	      Search  permission is denied for a component of the path

       [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]	      The  path points outside the process's allocated address

       [ENAMETOOLONG] A component of a pathname exceeded 255 characters, or an
		      entire path name exceeded 1023 characters.

       [ELOOP]	      Too  many symbolic links were encountered in translating
		      the pathname.

       [EIO]	      An I/O error occurred updating the inode.

       The system call succeeds unless:

       [EBADF]	      The fd is not a valid descriptor.

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

       [ETIMEDOUT]    A connect	 request  or  remote  file  operation  failed,
		      because  the  connected  party  did not properly respond
		      after a period of time that is dependent on the communi‚Äź
		      cations protocol.

See Also


List of man pages available for Ultrix

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