icon Top 9 categories map      RocketAware > man pages >


Tips: Browse or Search all pages for efficient awareness of more than 6000 of the most popular reusable and open source applications, functions, libraries, and FAQs.

The "RKT couplings" below include links to source code, updates, additional information, advice, FAQs, and overviews.


Search all pages


By activity
Professions, Sciences, Humanities, Business, ...

User Interface
Text-based, GUI, Audio, Video, Keyboards, Mouse, Images,...

Text Strings
Conversions, tests, processing, manipulation,...

Integer, Floating point, Matrix, Statistics, Boolean, ...

Algorithms, Memory, Process control, Debugging, ...

Stored Data
Data storage, Integrity, Encryption, Compression, ...

Networks, protocols, Interprocess, Remote, Client Server, ...

Hard World
Timing, Calendar and Clock, Audio, Video, Printer, Controls...

File System
Management, Filtering, File & Directory access, Viewers, ...


RocketLink!--> Man page versions: OpenBSD FreeBSD NetBSD RedHat Others

TRUNCATE(2)               OpenBSD Programmer's Manual              TRUNCATE(2)

     truncate, ftruncate - truncate a file to a specified length

     #include <unistd.h>

     truncate(const char *path, off_t length);

     ftruncate(int fd, off_t length);

     truncate() causes the file named by path or referenced by fd to be trun-
     cated 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.

     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.

     truncate() succeeds unless:

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

                   A component of a pathname exceeded {NAME_MAX} characters,
                   or an entire path name exceeded {PATH_MAX} characters.

     [ENOENT]      The named file does not exist.

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

     [EACCES]      The named file is not writable by the user.

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

     [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 be-
                   ing executed.

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

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

     [EPERM]       The effective user ID does not match the owner of the file
                   and the effective user ID is not the super-user.

     ftruncate() succeeds unless:

     [EBADF]       The fd is not a valid descriptor.

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

     [EINVAL]      The fd is not open for writing.


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

     The truncate() and ftruncate() function calls appeared in 4.2BSD.

OpenBSD 2.6                      June 4, 1993                                2

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]

[Overview Topics]

Up to: File Access - Operations affecting a file as a whole. (delete files, rename, truncate, etc.)

RocketLink!--> Man page versions: OpenBSD FreeBSD NetBSD RedHat Others

Rapid-Links: Search | About | Comments | Submit Path: RocketAware > man pages > truncate.2/
RocketAware.com is a service of Mib Software
Copyright 1999, Forrest J. Cavalier III. All Rights Reserved.
We welcome submissions and comments