chsize() in aix

Posted on 1999-01-26
Medium Priority
Last Modified: 2013-12-26
In sco-unix, there is a function chsize() which can be used to change the size of a file. What is the corresponding function in AIX ?


Question by:mikechen

Accepted Solution

mliberi earned 200 total points
ID: 1296401
from "AIX Version 4.3 Base Operating System and Extensions Technical Reference, Volume 2"

truncate, truncate64, ftruncate, or ftruncate64 Subroutine


Changes the length of regular files.

Standard C Library (libc.a)


#include <unistd.h>

int truncate (Path, Length)
const   char *Path;
off_t Length;

int ftruncate (FileDescriptor, Length)
int FileDescriptor;
off_t Length;

The Path parameter must point to a regular file for which the calling process has write permission. The Length parameter specifies the
desired length of the new file in bytes.

The Length parameter measures the specified file in bytes from the beginning of the file. If the new length is less than the previous length,
all data between the new length and the previous end of file is removed. If the new length in the specified file is greater than the previous
length, data between the old and new lengths is read as zeros. Full blocks are returned to the file system so that they can be used again,
and the file size is changed to the value of the Length parameter.

If the file designated in the Path parameter names a symbolic link, the link will be traversed and path-name resolution will continue.

These subroutines do not modify the seek pointer of the file.


Author Comment

ID: 1296402
Thank you very much.



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