git.m6w6.name Git - m6w6/libmemcached/blob - libtest/killpid.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  libtest
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 3 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22
  23 #include <libtest/common.h>
  24
  25 #include <cstdlib>
  26 #include <cstring>
  27 #include <iostream>
  28 #include <sstream>
  29 #include <signal.h>
  30 #include <sys/types.h>
  31 #include <sys/types.h>
  32 #include <sys/wait.h>
  33
  34
  35 #include <libtest/killpid.h>
  36 #include <libtest/stream.h>
  37
  38 using namespace libtest;
  39
  40 bool kill_pid(pid_t pid_arg)
  41 {
  42   assert(pid_arg > 0);
  43   if (pid_arg < 1)
  44   {
  45     Error << "Invalid pid:" << pid_arg;
  46     return false;
  47   }
  48
  49   if ((::kill(pid_arg, SIGTERM) == -1))
  50   {
  51     switch (errno)
  52     {
  53     case EPERM:
  54       Error << "Does someone else have a process running locally for " << int(pid_arg) << "?";
  55       return false;
  56
  57     case ESRCH:
  58       Error << "Process " << int(pid_arg) << " not found.";
  59       return false;
  60
  61     default:
  62     case EINVAL:
  63       Error << "kill() " << strerror(errno);
  64       return false;
  65     }
  66   }
  67
  68   int status= 0;
  69   if (waitpid(pid_arg, &status, 0) == -1)
  70   {
  71     switch (errno)
  72     {
  73       // Just means that the server has already gone away
  74     case ECHILD:
  75       {
  76         return true;
  77       }
  78     }
  79
  80     Error << "Error occured while waitpid(" << strerror(errno) << ") on pid " << int(pid_arg);
  81
  82     return false;
  83   }
  84
  85   return true;
  86 }
  87
  88
  89 pid_t kill_file(const std::string &filename)
  90 {
  91   pid_t ret= -1;
  92   FILE *fp;
  93
  94   if (filename.empty())
  95     return ret;
  96
  97   if ((fp= fopen(filename.c_str(), "r")))
  98   {
  99     char pid_buffer[1024];
 100
 101     char *ptr= fgets(pid_buffer, sizeof(pid_buffer), fp);
 102     fclose(fp);
 103
 104     if (ptr)
 105     {
 106       pid_t pid= (pid_t)atoi(pid_buffer);
 107       if (pid != 0)
 108       {
 109         kill_pid(pid);
 110         unlink(filename.c_str()); // If this happens we may be dealing with a dead server that left its pid file.
 111       }
 112     }
 113   }
 114
 115   return ret;
 116 }
 117
 118 #define STRINGIFY(x) #x
 119 #define TOSTRING(x) STRINGIFY(x)
 120 #define LIBTEST_AT __FILE__ ":" TOSTRING(__LINE__)
 121
 122 pid_t get_pid_from_file(const std::string &filename, std::stringstream& error_message)
 123 {
 124   pid_t ret= -1;
 125   FILE *fp;
 126
 127   if (filename.empty())
 128   {
 129     error_message << LIBTEST_AT << " empty pid file";
 130     return ret;
 131   }
 132
 133   if ((fp= fopen(filename.c_str(), "r")))
 134   {
 135     char pid_buffer[1024];
 136
 137     char *ptr= fgets(pid_buffer, sizeof(pid_buffer), fp);
 138     fclose(fp);
 139
 140     if (ptr)
 141     {
 142       ret= (pid_t)atoi(pid_buffer);
 143       if (ret < 1)
 144       {
 145         error_message << LIBTEST_AT << " Invalid pid was read from file " << filename;
 146       }
 147     }
 148     else
 149     {
 150       error_message << LIBTEST_AT << " File " << filename << " was empty ";
 151     }
 152
 153     return ret;
 154   }
 155   else
 156   {
 157     char buffer[1024];
 158     char *current_directory= getcwd(buffer, sizeof(buffer));
 159     error_message << "Error while opening " << current_directory << "/" << filename << " " << strerror(errno);
 160   }
 161
 162   return ret;
 163 }