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      1 // Copyright 2010 Google Inc.
      2 // All rights reserved.
      3 //
      4 // Redistribution and use in source and binary forms, with or without
      5 // modification, are permitted provided that the following conditions are
      6 // met:
      7 //
      8 // * Redistributions of source code must retain the above copyright
      9 //   notice, this list of conditions and the following disclaimer.
     10 // * 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 // * Neither the name of Google Inc. nor the names of its contributors
     14 //   may be used to endorse or promote products derived from this software
     15 //   without specific prior written permission.
     16 //
     17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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     26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 
     29 /// \file utils/process/system.hpp
     30 /// Indirection to perform system calls.
     31 ///
     32 /// The indirections exposed in this file are provided to allow unit-testing of
     33 /// particular system behaviors (e.g. failures).  The caller of a routine in
     34 /// this library is allowed, for testing purposes only, to explicitly replace
     35 /// the pointers in this file with custom functions to inject a particular
     36 /// behavior into the library code.
     37 ///
     38 /// Do not include this header from other header files.
     39 ///
     40 /// It may be nice to go one step further and completely abstract the library
     41 /// functions in here to provide exception-based error reporting.
     42 
     43 #if !defined(UTILS_PROCESS_SYSTEM_HPP)
     44 #define UTILS_PROCESS_SYSTEM_HPP
     45 
     46 extern "C" {
     47 #include <unistd.h>
     48 }
     49 
     50 namespace utils {
     51 namespace process {
     52 namespace detail {
     53 
     54 
     55 extern int (*syscall_dup2)(const int, const int);
     56 extern pid_t (*syscall_fork)(void);
     57 extern int (*syscall_open)(const char*, const int, ...);
     58 extern int (*syscall_pipe)(int[2]);
     59 extern pid_t (*syscall_waitpid)(const pid_t, int*, const int);
     60 
     61 
     62 }  // namespace detail
     63 }  // namespace process
     64 }  // namespace utils
     65 
     66 #endif  // !defined(UTILS_PROCESS_SYSTEM_HPP)
     67