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   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Data Differential YATL (i.e. libtest)  library
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   5  *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
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  36
  37 #include <config.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   int status= 0;
  84   if (waitpid(pid_arg, &status, 0) == -1)
  85   {
  86     switch (errno)
  87     {
  88       // Just means that the server has already gone away
  89     case ECHILD:
  90       {
  91         return true;
  92       }
  93     }
  94
  95     Error << "Error occured while waitpid(" << strerror(errno) << ") on pid " << int(pid_arg);
  96
  97     return false;
  98   }
  99
 100   return true;
 101 }
 102
 103 bool check_pid(const std::string &filename)
 104 {
 105   if (filename.empty())
 106   {
 107     return false;
 108   }
 109
 110   FILE *fp;
 111   if ((fp= fopen(filename.c_str(), "r")))
 112   {
 113     char pid_buffer[1024];
 114
 115     char *ptr= fgets(pid_buffer, sizeof(pid_buffer), fp);
 116     fclose(fp);
 117
 118     if (ptr)
 119     {
 120       pid_t pid= (pid_t)atoi(pid_buffer);
 121       if (pid > 0)
 122       {
 123         return (::kill(pid, 0) == 0);
 124       }
 125     }
 126   }
 127
 128   return false;
 129 }
 130
 131
 132 bool kill_file(const std::string &filename)
 133 {
 134   if (filename.empty())
 135   {
 136     return true;
 137   }
 138
 139   FILE *fp;
 140   if ((fp= fopen(filename.c_str(), "r")))
 141   {
 142     char pid_buffer[1024];
 143
 144     char *ptr= fgets(pid_buffer, sizeof(pid_buffer), fp);
 145     fclose(fp);
 146
 147     if (ptr)
 148     {
 149       pid_t pid= (pid_t)atoi(pid_buffer);
 150       if (pid != 0)
 151       {
 152         bool ret= kill_pid(pid);
 153         unlink(filename.c_str()); // If this happens we may be dealing with a dead server that left its pid file.
 154
 155         return ret;
 156       }
 157     }
 158   }
 159
 160   return false;
 161 }
 162
 163 #define STRINGIFY(x) #x
 164 #define TOSTRING(x) STRINGIFY(x)
 165 #define LIBTEST_AT __FILE__ ":" TOSTRING(__LINE__)
 166
 167 pid_t get_pid_from_file(const std::string &filename, std::stringstream& error_message)
 168 {
 169   pid_t ret= -1;
 170   FILE *fp;
 171
 172   if (filename.empty())
 173   {
 174     error_message << LIBTEST_AT << " empty pid file";
 175     return ret;
 176   }
 177
 178   if ((fp= fopen(filename.c_str(), "r")))
 179   {
 180     char pid_buffer[1024];
 181
 182     char *ptr= fgets(pid_buffer, sizeof(pid_buffer), fp);
 183     fclose(fp);
 184
 185     if (ptr)
 186     {
 187       ret= (pid_t)atoi(pid_buffer);
 188       if (ret < 1)
 189       {
 190         error_message << LIBTEST_AT << " Invalid pid was read from file " << filename;
 191       }
 192     }
 193     else
 194     {
 195       error_message << LIBTEST_AT << " File " << filename << " was empty ";
 196     }
 197
 198     return ret;
 199   }
 200   else
 201   {
 202     char buffer[1024];
 203     char *current_directory= getcwd(buffer, sizeof(buffer));
 204     error_message << "Error while opening " << current_directory << "/" << filename << " " << strerror(errno);
 205   }
 206
 207   return ret;
 208 }