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TRUNCATE(2) Linux Programmer's Manual TRUNCATE(2)
NAME
truncate, ftruncate - truncate a file to a specified length
SYNOPSIS
#include <unistd.h>
#include <sys/types.h>
int truncate(const char *path, off_t length);
int ftruncate(int fd, off_t length);
DESCRIPTION
The truncate() and ftruncate() functions cause the regular file named
by path or referenced by fd to be truncated to a size of precisely
length bytes.
If the file previously was larger than this size, the extra data is
lost. If the file previously was shorter, it is extended, and the
extended part reads as null bytes ('\0').
The file offset is not changed.
If the size changed, then the st_ctime and st_mtime fields (respec-
tively, time of last status change and time of last modification; see
stat(2)) for the file are updated, and the set-user-ID and set-group-ID
permission bits may be cleared.
With ftruncate(), the file must be open for writing; with truncate(),
the file must be writable.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is
set appropriately.
ERRORS
For truncate():
EACCES Search permission is denied for a component of the path prefix,
or the named file is not writable by the user. (See also
path_resolution(2).)
EFAULT Path points outside the process's allocated address space.
EFBIG The argument length is larger than the maximum file size. (XSI)
EINTR A signal was caught during execution.
EINVAL The argument length is negative or larger than the maximum file
size.
EIO An I/O error occurred updating the inode.
EISDIR The named file is a directory.
ELOOP Too many symbolic links were encountered in translating the
pathname.
ENAMETOOLONG
A component of a pathname exceeded 255 characters, or an entire
pathname exceeded 1023 characters.
ENOENT The named file does not exist.
ENOTDIR
A component of the path prefix is not 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.
For ftruncate() the same errors apply, but instead of things that can
be wrong with path, we now have things that can be wrong with fd:
EBADF The fd is not a valid descriptor.
EBADF or EINVAL
The fd is not open for writing.
EINVAL The fd does not reference a regular file.
CONFORMING TO
4.4BSD, SVr4 (these function calls first appeared in 4.2BSD). POSIX
1003.1-1996 has ftruncate(). POSIX 1003.1-2001 also has truncate(), as
an XSI extension.
SVr4 documents additional truncate() error conditions EMFILE, EMULTIHP,
ENFILE, ENOLINK. SVr4 documents for ftruncate() an additional EAGAIN
error condition.
NOTES
The above description is for XSI-compliant systems. For non-XSI-com-
pliant systems, the POSIX standard allows two behaviours for ftrun
cate() when length exceeds the file length (note that truncate() is not
specified at all in such an environment): either returning an error, or
extending the file. (Most Unices follow the XSI requirement.)
SEE ALSO
open(2), path_resolution(2), stat(2)
Linux 2.6.7 2004-06-23 TRUNCATE(2)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Tue Feb 13 02:17:42 GMT 2007
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