LCOV - code coverage report
Current view: top level - strace - negated_errno.h (source / functions) Hit Total Coverage
Test: strace-4.18.0.129.97bbb Code Coverage Lines: 4 4 100.0 %
Date: 2017-07-31 03:46:08 Functions: 0 0 -
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 2 2 100.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Copyright (c) 2015-2017 Dmitry V. Levin <ldv@altlinux.org>
       3                 :            :  * All rights reserved.
       4                 :            :  *
       5                 :            :  * Redistribution and use in source and binary forms, with or without
       6                 :            :  * modification, are permitted provided that the following conditions
       7                 :            :  * are met:
       8                 :            :  * 1. Redistributions of source code must retain the above copyright
       9                 :            :  *    notice, this list of conditions and the following disclaimer.
      10                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      11                 :            :  *    notice, this list of conditions and the following disclaimer in the
      12                 :            :  *    documentation and/or other materials provided with the distribution.
      13                 :            :  * 3. The name of the author may not be used to endorse or promote products
      14                 :            :  *    derived from this software without specific prior written permission.
      15                 :            :  *
      16                 :            :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      17                 :            :  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      18                 :            :  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
      19                 :            :  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
      20                 :            :  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      21                 :            :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      22                 :            :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      23                 :            :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      24                 :            :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      25                 :            :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      26                 :            :  */
      27                 :            : 
      28                 :            : #ifndef STRACE_NEGATED_ERRNO_H
      29                 :            : #define STRACE_NEGATED_ERRNO_H
      30                 :            : 
      31                 :            : /*
      32                 :            :  * Check the syscall return value register value for whether it is
      33                 :            :  * a negated errno code indicating an error, or a success return value.
      34                 :            :  */
      35                 :            : static inline bool
      36                 :            : is_negated_errno(kernel_ulong_t val)
      37                 :            : {
      38                 :            :         /* Linux kernel defines MAX_ERRNO to 4095. */
      39                 :     447451 :         kernel_ulong_t max = -(kernel_long_t) 4095;
      40                 :            : 
      41                 :            : #ifndef current_klongsize
      42         [ +  + ]:     447451 :         if (current_klongsize < sizeof(val)) {
      43                 :     198012 :                 val = (uint32_t) val;
      44                 :     198012 :                 max = (uint32_t) max;
      45                 :            :         }
      46                 :            : #endif /* !current_klongsize */
      47                 :            : 
      48                 :            :         return val >= max;
      49                 :            : }
      50                 :            : 
      51                 :            : #endif /* !STRACE_NEGATED_ERRNO_H */

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