TRUNCATE
Section: System Calls (2)
Updated: March 29, 1986
Index
Return to Main Contents
NAME
truncate - truncate a file to a specified length
SYNOPSIS
truncate(path, length)
char *path;
off_t length;
ftruncate(fd, length)
int fd;
off_t 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:
- [ENOTDIR]
-
A component of the path prefix is not a directory.
- [EINVAL]
-
The pathname contains a character with the high-order bit set.
- [ENAMETOOLONG]
-
A component of a pathname exceeded 255 characters,
or an entire path name exceeded 1023 characters.
- [ENOENT]
-
The named file does not exist.
- [EACCES]
-
Search permission is denied for a component of the path prefix.
- [EACCES]
-
The named file is not writable by the user.
- [ELOOP]
-
Too many symbolic links were encountered in translating the pathname.
- [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.
- [EIO]
-
An I/O error occurred updating the inode.
- [EFAULT]
-
Path
points outside the process's allocated address space.
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.
SEE ALSO
open(2)
BUGS
These calls should be generalized to allow ranges
of bytes in a file to be discarded.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- ERRORS
-
- SEE ALSO
-
- BUGS
-
This document was created by
man2html,
using the manual pages.
Time: 04:51:40 GMT, January 31, 2023