src/tools/fs_shell/external_commands_unix.cpp

   1 /*
   2  * Copyright 2005-2010, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include "external_commands.h"
   8
   9 #include <errno.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12
  13
  14 static FILE*
  15 get_input()
  16 {
  17         static FILE* sInput = fdopen(3, "r");
  18         return sInput;
  19 }
  20
  21
  22 static FILE*
  23 get_output()
  24 {
  25         static FILE* sOutput = fdopen(4, "w");
  26         return sOutput;
  27 }
  28
  29
  30 bool
  31 FSShell::get_external_command(char* buffer, int size)
  32 {
  33         // get the input stream
  34         FILE* in = get_input();
  35         if (in == NULL) {
  36                 fprintf(stderr, "Error: Failed to open command input: %s\n",
  37                         strerror(errno));
  38                 return false;
  39         }
  40
  41         while (true) {
  42                 // read a command line
  43                 if (fgets(buffer, size, in) != NULL)
  44                         return true;
  45
  46                 // when interrupted, try again
  47                 if (errno != EINTR)
  48                         return false;
  49         }
  50 }
  51
  52
  53 void
  54 FSShell::reply_to_external_command(int result)
  55 {
  56         // get the output stream
  57         FILE* out = get_output();
  58         if (out == NULL) {
  59                 fprintf(stderr, "Error: Failed to open command output: %s\n",
  60                         strerror(errno));
  61                 return;
  62         }
  63
  64         if (fprintf(out, "%d\n", result) < 0 || fflush(out) == EOF) {
  65                 fprintf(stderr, "Error: Failed to write command reply to output reply: "
  66                         "%s\n", strerror(errno));
  67         }
  68 }
  69
  70
  71 void
  72 FSShell::external_command_cleanup()
  73 {
  74         // The file will be closed automatically when the team exits.
  75 }