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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-05 17:47:29 +0000 |
commit | 4f5791ebd03eaec1c7da0865a383175b05102712 (patch) | |
tree | 8ce7b00f7a76baa386372422adebbe64510812d4 /third_party/heimdal/lib/roken/flock.c | |
parent | Initial commit. (diff) | |
download | samba-4f5791ebd03eaec1c7da0865a383175b05102712.tar.xz samba-4f5791ebd03eaec1c7da0865a383175b05102712.zip |
Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/heimdal/lib/roken/flock.c')
-rw-r--r-- | third_party/heimdal/lib/roken/flock.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/roken/flock.c b/third_party/heimdal/lib/roken/flock.c new file mode 100644 index 0000000..068d099 --- /dev/null +++ b/third_party/heimdal/lib/roken/flock.c @@ -0,0 +1,154 @@ +/* + * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <config.h> + +#ifndef HAVE_FLOCK + +#include "roken.h" + +#define OP_MASK (LOCK_SH | LOCK_EX | LOCK_UN) + + +ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL +rk_flock(int fd, int operation) +{ +#if defined(HAVE_FCNTL) && defined(F_SETLK) + struct flock arg; + int code, cmd; + + arg.l_whence = SEEK_SET; + arg.l_start = 0; + arg.l_len = 0; /* means to EOF */ + + if (operation & LOCK_NB) + cmd = F_SETLK; + else + cmd = F_SETLKW; /* Blocking */ + + switch (operation & OP_MASK) { + case LOCK_UN: + arg.l_type = F_UNLCK; + code = fcntl(fd, F_SETLK, &arg); + break; + case LOCK_SH: + arg.l_type = F_RDLCK; + code = fcntl(fd, cmd, &arg); + break; + case LOCK_EX: + arg.l_type = F_WRLCK; + code = fcntl(fd, cmd, &arg); + break; + default: + errno = EINVAL; + code = -1; + break; + } + return code; + +#elif defined(_WIN32) + /* Windows */ + +#define FLOCK_OFFSET_LOW 0 +#define FLOCK_OFFSET_HIGH 0 +#define FLOCK_LENGTH_LOW 0x00000000 +#define FLOCK_LENGTH_HIGH 0x80000000 + + HANDLE hFile; + OVERLAPPED ov; + BOOL rv = FALSE; + DWORD f = 0; + + hFile = (HANDLE) _get_osfhandle(fd); + if (hFile == NULL || hFile == INVALID_HANDLE_VALUE) { + _set_errno(EBADF); + return -1; + } + + ZeroMemory(&ov, sizeof(ov)); + ov.hEvent = NULL; + ov.Offset = FLOCK_OFFSET_LOW; + ov.OffsetHigh = FLOCK_OFFSET_HIGH; + + if (operation & LOCK_NB) + f = LOCKFILE_FAIL_IMMEDIATELY; + + switch (operation & OP_MASK) { + case LOCK_UN: /* Unlock */ + rv = UnlockFileEx(hFile, 0, + FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH, &ov); + break; + + case LOCK_SH: /* Shared lock */ + rv = LockFileEx(hFile, f, 0, + FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH, &ov); + break; + + case LOCK_EX: /* Exclusive lock */ + rv = LockFileEx(hFile, f|LOCKFILE_EXCLUSIVE_LOCK, 0, + FLOCK_LENGTH_LOW, FLOCK_LENGTH_HIGH, + &ov); + break; + + default: + _set_errno(EINVAL); + return -1; + } + + if (!rv) { + switch (GetLastError()) { + case ERROR_SHARING_VIOLATION: + case ERROR_LOCK_VIOLATION: + case ERROR_IO_PENDING: + _set_errno(EWOULDBLOCK); + break; + + case ERROR_ACCESS_DENIED: + _set_errno(EACCES); + break; + + default: + _set_errno(ENOLCK); + } + return -1; + } + + return 0; + +#else + return -1; +#endif +} + +#endif + |