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      1 /*
      2 * Copyright (c) 2015, The Linux Foundation. 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 *     * Redistributions of source code must retain the above copyright
      8 *       notice, this list of conditions and the following disclaimer.
      9 *     * Redistributions in binary form must reproduce the above
     10 *       copyright notice, this list of conditions and the following
     11 *       disclaimer in the documentation and/or other materials provided
     12 *       with the distribution.
     13 *     * Neither the name of The Linux Foundation nor the names of its
     14 *       contributors may be used to endorse or promote products derived
     15 *       from this software without specific prior written permission.
     16 *
     17 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
     18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
     20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
     21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
     24 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     26 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
     27 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 */
     29 
     30 #include <utils/sys.h>
     31 #include <sys/ioctl.h>
     32 #include <fcntl.h>
     33 #include <unistd.h>
     34 #include <string>
     35 
     36 #define __CLASS__ "Sys"
     37 
     38 namespace sdm {
     39 
     40 #ifndef SDM_VIRTUAL_DRIVER
     41 
     42 int PthreadCancel(pthread_t /* thread */) {
     43   return 0;
     44 }
     45 
     46 // Pointer to actual driver interfaces.
     47 Sys::ioctl Sys::ioctl_ = ::ioctl;
     48 Sys::access Sys::access_ = ::access;
     49 Sys::open Sys::open_ = ::open;
     50 Sys::close Sys::close_ = ::close;
     51 Sys::poll Sys::poll_ = ::poll;
     52 Sys::pread Sys::pread_ = ::pread;
     53 Sys::pwrite Sys::pwrite_ = ::pwrite;
     54 Sys::pthread_cancel Sys::pthread_cancel_ = PthreadCancel;
     55 Sys::dup Sys::dup_ = ::dup;
     56 Sys::read Sys::read_ = ::read;
     57 Sys::write Sys::write_ = ::write;
     58 Sys::eventfd Sys::eventfd_ = ::eventfd;
     59 
     60 bool Sys::getline_(fstream &fs, std::string &line) {
     61   return std::getline(fs, line) ? true : false;
     62 }
     63 
     64 #endif  // SDM_VIRTUAL_DRIVER
     65 
     66 DynLib::~DynLib() {
     67   Close();
     68 }
     69 
     70 bool DynLib::Open(const char *lib_name) {
     71   Close();
     72   lib_ = ::dlopen(lib_name, RTLD_NOW);
     73 
     74   return (lib_ != NULL);
     75 }
     76 
     77 bool DynLib::Sym(const char *func_name, void **func_ptr) {
     78   if (lib_) {
     79     *func_ptr = ::dlsym(lib_, func_name);
     80   } else {
     81     *func_ptr = NULL;
     82   }
     83 
     84   return (*func_ptr != NULL);
     85 }
     86 
     87 void DynLib::Close() {
     88   if (lib_) {
     89     ::dlclose(lib_);
     90     lib_ = NULL;
     91   }
     92 }
     93 
     94 }  // namespace sdm
     95 
     96