d9898ee8 |
1 | /* |
2 | ** Copyright 1998 - 1999 Double Precision, Inc. See COPYING for |
3 | ** distribution information. |
4 | */ |
5 | |
6 | /* $Id: locklockf.c,v 1.4 2002/09/02 16:55:56 mrsam Exp $ */ |
7 | |
8 | #if HAVE_CONFIG_H |
9 | #include "config.h" |
10 | #endif |
11 | #include <sys/types.h> |
12 | #if HAVE_FCNTL_H |
13 | #include <fcntl.h> |
14 | #endif |
15 | #if HAVE_SYS_FCNTL_H |
16 | #include <sys/fcntl.h> |
17 | #endif |
18 | #if HAVE_UNISTD_H |
19 | #include <unistd.h> |
20 | #endif |
21 | #if HAVE_ERRNO_H |
22 | #include <errno.h> |
23 | #endif |
24 | #include "liblock.h" |
25 | |
26 | int ll_lockfd(int fd, int ltype, LL_OFFSET_TYPE start, LL_OFFSET_TYPE len) |
27 | { |
28 | off_t p; |
29 | |
30 | if (ltype & ll_whence_curpos) |
31 | p=lseek(fd, start, SEEK_CUR); |
32 | else if (ltype && ll_whence_end) |
33 | p=lseek(fd, start, SEEK_END); |
34 | else p=lseek(fd, start, SEEK_SET); |
35 | |
36 | if (p < 0) return (-1); |
37 | |
38 | if (lockf(fd, ltype & ll_unlock ? F_ULOCK: |
39 | ltype & ll_wait ? F_LOCK:F_TLOCK, len)) |
40 | { |
41 | lseek(fd, p, SEEK_SET); |
42 | return (-1); |
43 | } |
44 | lseek(fd, SEEK_SET, p); |
45 | return (0); |
46 | } |