1 /* ftruncate emulations that work on some System V's.
2 This file is in the public domain. */
13 return fcntl (fd, F_CHSIZE, length);
17 /* The following function was written by
18 kucharsk@Solbourne.com (William Kucharski) */
25 ftruncate (fd, length)
32 if (fstat (fd, &filebuf) < 0)
35 if (filebuf.st_size < length)
37 /* Extend file length. */
38 if (lseek (fd, (length - 1), SEEK_SET) < 0)
41 /* Write a "0" byte. */
42 if (write (fd, "", 1) != 1)
47 /* Truncate length. */
51 fl.l_type = F_WRLCK; /* Write lock on file space. */
53 /* This relies on the UNDOCUMENTED F_FREESP argument to
54 fcntl, which truncates the file so that it ends at the
55 position indicated by fl.l_start.
56 Will minor miracles never cease? */
57 if (fcntl (fd, F_FREESP, &fl) < 0)
65 ftruncate (fd, length)
69 return chsize (fd, length);