mdw@git.distorted.org.uk Git - termux-packages/blob - disabled-packages/cups/lockf.cpp.patch

   1 --- /dev/null   2016-12-11 08:33:21.825618476 +0530
   2 +++ ./cups/lockf.cpp    2016-12-11 09:44:20.050966252 +0530
   3 @@ -0,0 +1,89 @@
   4 +/*
   5 + * Copyright (C) 2016 The Android Open Source Project
   6 + * All rights reserved.
   7 + *
   8 + * Redistribution and use in source and binary forms, with or without
   9 + * modification, are permitted provided that the following conditions
  10 + * are met:
  11 + *  * Redistributions of source code must retain the above copyright
  12 + *    notice, this list of conditions and the following disclaimer.
  13 + *  * Redistributions in binary form must reproduce the above copyright
  14 + *    notice, this list of conditions and the following disclaimer in
  15 + *    the documentation and/or other materials provided with the
  16 + *    distribution.
  17 + *
  18 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19 + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20 + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21 + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  22 + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23 + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24 + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  25 + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26 + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27 + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  28 + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29 + * SUCH DAMAGE.
  30 + */
  31 +#include <unistd.h>
  32 +#include <errno.h>
  33 +#include <fcntl.h>
  34 +#include <string.h>
  35 +
  36 +#ifndef _BITS_LOCKF_H_
  37 +#define _BITS_LOCKF_H_
  38 +
  39 +#include <sys/cdefs.h>
  40 +
  41 +#define F_ULOCK 0
  42 +#define F_LOCK 1
  43 +#define F_TLOCK 2
  44 +#define F_TEST 3
  45 +
  46 +__BEGIN_DECLS
  47 +
  48 +#if defined(__USE_FILE_OFFSET64)
  49 +int lockf(int, int, off_t) __RENAME(lockf64);
  50 +#else
  51 +int lockf(int, int, off_t);
  52 +#endif
  53 +int lockf64(int, int, off64_t);
  54 +
  55 +__END_DECLS
  56 +
  57 +#endif
  58 +
  59 +
  60 +int lockf64(int fd, int cmd, off64_t length) {
  61 +  // Translate POSIX lockf into fcntl.
  62 +  struct flock fl;
  63 +  memset(&fl, 0, sizeof(fl));
  64 +  fl.l_whence = SEEK_CUR;
  65 +  fl.l_start = 0;
  66 +  fl.l_len = length;
  67 +  if (cmd == F_ULOCK) {
  68 +    fl.l_type = F_UNLCK;
  69 +    cmd = F_SETLK64;
  70 +    return fcntl(fd, F_SETLK64, &fl);
  71 +  }
  72 +  if (cmd == F_LOCK) {
  73 +    fl.l_type = F_WRLCK;
  74 +    return fcntl(fd, F_SETLKW64, &fl);
  75 +  }
  76 +  if (cmd == F_TLOCK) {
  77 +    fl.l_type = F_WRLCK;
  78 +    return fcntl(fd, F_SETLK64, &fl);
  79 +  }
  80 +  if (cmd == F_TEST) {
  81 +    fl.l_type = F_RDLCK;
  82 +    if (fcntl(fd, F_GETLK64, &fl) == -1) return -1;
  83 +    if (fl.l_type == F_UNLCK || fl.l_pid == getpid()) return 0;
  84 +    errno = EACCES;
  85 +    return -1;
  86 +  }
  87 +  errno = EINVAL;
  88 +  return -1;
  89 +}
  90 +int lockf(int fd, int cmd, off_t length) {
  91 +  return lockf64(fd, cmd, length);
  92 +}