2 * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 #define OP_MASK (LOCK_SH | LOCK_EX | LOCK_UN)
43 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
44 rk_flock(int fd, int operation)
46 #if defined(HAVE_FCNTL) && defined(F_SETLK)
50 arg.l_whence = SEEK_SET;
52 arg.l_len = 0; /* means to EOF */
54 if (operation & LOCK_NB)
57 cmd = F_SETLKW; /* Blocking */
59 switch (operation & OP_MASK) {
62 code = fcntl(fd, F_SETLK, &arg);
66 code = fcntl(fd, cmd, &arg);
70 code = fcntl(fd, cmd, &arg);
82 #define FLOCK_OFFSET_LOW 0
83 #define FLOCK_OFFSET_HIGH 0
84 #define FLOCK_LENGTH_LOW 0x00000000
85 #define FLOCK_LENGTH_HIGH 0x80000000
92 hFile = (HANDLE) _get_osfhandle(fd);
93 if (hFile == NULL || hFile == INVALID_HANDLE_VALUE) {
98 ZeroMemory(&ov, sizeof(ov));
100 ov.Offset = FLOCK_OFFSET_LOW;
101 ov.OffsetHigh = FLOCK_OFFSET_HIGH;
103 if (operation & LOCK_NB)
104 f = LOCKFILE_FAIL_IMMEDIATELY;
106 switch (operation & OP_MASK) {
107 case LOCK_UN: /* Unlock */
108 rv = UnlockFileEx(hFile, 0,
109 FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH, &ov);
112 case LOCK_SH: /* Shared lock */
113 rv = LockFileEx(hFile, f, 0,
114 FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH, &ov);
117 case LOCK_EX: /* Exclusive lock */
118 rv = LockFileEx(hFile, f|LOCKFILE_EXCLUSIVE_LOCK, 0,
119 FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH,
129 switch (GetLastError()) {
130 case ERROR_SHARING_VIOLATION:
131 case ERROR_LOCK_VIOLATION:
132 case ERROR_IO_PENDING:
133 _set_errno(EWOULDBLOCK);
136 case ERROR_ACCESS_DENIED: