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   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Data Differential YATL (i.e. libtest)  library
   4  *
   5  *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
   6  *
   7  *  Redistribution and use in source and binary forms, with or without
   8  *  modification, are permitted provided that the following conditions are
   9  *  met:
  10  *
  11  *      * Redistributions of source code must retain the above copyright
  12  *  notice, this list of conditions and the following disclaimer.
  13  *
  14  *      * Redistributions in binary form must reproduce the above
  15  *  copyright notice, this list of conditions and the following disclaimer
  16  *  in the documentation and/or other materials provided with the
  17  *  distribution.
  18  *
  19  *      * The names of its contributors may not be used to endorse or
  20  *  promote products derived from this software without specific prior
  21  *  written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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  33  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  */
  36
  37 #include "libtest/yatlcon.h"
  38 #include <libtest/common.h>
  39
  40 #include <cstdlib>
  41 #include <cstring>
  42 #include <iostream>
  43 #include <sstream>
  44 #include <signal.h>
  45 #include <sys/types.h>
  46 #include <sys/types.h>
  47 #include <sys/wait.h>
  48
  49
  50 #include <libtest/killpid.h>
  51 #include <libtest/stream.h>
  52
  53 using namespace libtest;
  54
  55 bool kill_pid(pid_t pid_arg)
  56 {
  57   assert(pid_arg > 0);
  58   if (pid_arg < 1)
  59   {
  60     Error << "Invalid pid:" << pid_arg;
  61     return false;
  62   }
  63
  64   if ((::kill(pid_arg, SIGTERM) == -1))
  65   {
  66     switch (errno)
  67     {
  68     case EPERM:
  69       Error << "Does someone else have a process running locally for " << int(pid_arg) << "?";
  70       return false;
  71
  72     case ESRCH:
  73       Error << "Process " << int(pid_arg) << " not found.";
  74       return false;
  75
  76     default:
  77     case EINVAL:
  78       Error << "kill() " << strerror(errno);
  79       return false;
  80     }
  81   }
  82
  83   {
  84     uint32_t this_wait= 0;
  85     uint32_t timeout= 20; // This number should be high enough for valgrind startup (which is slow)
  86     uint32_t waited;
  87     uint32_t retry;
  88
  89     for (waited= 0, retry= 4; ; retry++, waited+= this_wait)
  90     {
  91       int status= 0;
  92       if (waitpid(pid_arg, &status, WNOHANG) == 0)
  93       {
  94         break;
  95       }
  96       else if (errno == ECHILD)
  97       {
  98         // Server has already gone away
  99         break;
 100       }
 101       else if (waited >= timeout)
 102       {
 103         // Timeout failed
 104         kill(pid_arg, SIGKILL);
 105         break;
 106       }
 107
 108       this_wait= retry * retry / 3 + 1;
 109       libtest::dream(this_wait, 0);
 110     }
 111   }
 112
 113   return true;
 114 }
 115
 116 bool check_pid(const std::string &filename)
 117 {
 118   if (filename.empty())
 119   {
 120     return false;
 121   }
 122
 123   FILE *fp;
 124   if ((fp= fopen(filename.c_str(), "r")))
 125   {
 126     libtest::vchar_t pid_buffer;
 127     pid_buffer.resize(1024);
 128
 129     char *ptr= fgets(&pid_buffer[0], int(pid_buffer.size()), fp);
 130     fclose(fp);
 131
 132     if (ptr)
 133     {
 134       pid_t pid= (pid_t)atoi(&pid_buffer[0]);
 135       if (pid > 0)
 136       {
 137         return (::kill(pid, 0) == 0);
 138       }
 139     }
 140   }
 141
 142   return false;
 143 }
 144
 145
 146 bool kill_file(const std::string &filename)
 147 {
 148   if (filename.empty())
 149   {
 150     return true;
 151   }
 152
 153   FILE *fp;
 154   if ((fp= fopen(filename.c_str(), "r")))
 155   {
 156     libtest::vchar_t pid_buffer;
 157     pid_buffer.resize(1024);
 158
 159     char *ptr= fgets(&pid_buffer[0], int(pid_buffer.size()), fp);
 160     fclose(fp);
 161
 162     if (ptr)
 163     {
 164       pid_t pid= (pid_t)atoi(&pid_buffer[0]);
 165       if (pid != 0)
 166       {
 167         bool ret= kill_pid(pid);
 168         unlink(filename.c_str()); // If this happens we may be dealing with a dead server that left its pid file.
 169
 170         return ret;
 171       }
 172     }
 173   }
 174
 175   return false;
 176 }
 177
 178 #define STRINGIFY(x) #x
 179 #define TOSTRING(x) STRINGIFY(x)
 180 #define LIBTEST_AT __FILE__ ":" TOSTRING(__LINE__)
 181
 182 pid_t get_pid_from_file(const std::string &filename, std::stringstream& error_message)
 183 {
 184   pid_t ret= -1;
 185
 186   if (filename.empty())
 187   {
 188     error_message << LIBTEST_AT << " empty pid file";
 189     return ret;
 190   }
 191
 192   FILE *fp;
 193   if ((fp= fopen(filename.c_str(), "r")))
 194   {
 195     libtest::vchar_t pid_buffer;
 196     pid_buffer.resize(1024);
 197
 198     char *ptr= fgets(&pid_buffer[0], int(pid_buffer.size()), fp);
 199     if (ptr)
 200     {
 201       ret= (pid_t)atoi(&pid_buffer[0]);
 202       if (ret < 1)
 203       {
 204         error_message << LIBTEST_AT << " Invalid pid was read from file " << filename;
 205       }
 206     }
 207     else
 208     {
 209       error_message << LIBTEST_AT << " File " << filename << " was empty ";
 210     }
 211
 212     fclose(fp);
 213
 214     return ret;
 215   }
 216   else
 217   {
 218     libtest::vchar_t buffer;
 219     buffer.resize(1024);
 220     char *current_directory= getcwd(&buffer[0], buffer.size());
 221     error_message << "Error while opening " << current_directory << "/" << filename << " " << strerror(errno);
 222   }
 223
 224   return ret;
 225 }