source/io/pipe.cpp

   1 #ifndef WIN32
   2 #include <fcntl.h>
   3 #include <errno.h>
   4 #endif
   5 #include <msp/core/systemerror.h>
   6 #include <msp/strings/formatter.h>
   7 #include "handle_private.h"
   8 #include "pipe.h"
   9
  10 using namespace std;
  11
  12 namespace Msp {
  13 namespace IO {
  14
  15 Pipe::Pipe():
  16         reader(handle[0], 1024)
  17 {
  18 #ifdef WIN32
  19         string name = format("\\\\.\\pipe\\%u.%p", GetCurrentProcessId(), this);
  20         *handle[0] = CreateNamedPipe(name.c_str(), PIPE_ACCESS_INBOUND|FILE_FLAG_OVERLAPPED, PIPE_TYPE_BYTE, 1, 1024, 1024, 0, 0);
  21         if(!handle[0])
  22                 throw system_error("CreateNamedPipe");
  23
  24         *handle[1] = CreateFile(name.c_str(), GENERIC_WRITE, 0, 0, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, 0);
  25         if(!handle[1])
  26         {
  27                 unsigned err = GetLastError();
  28                 CloseHandle(*handle[0]);
  29                 throw system_error(format("CreateFile(%s)", name), err);
  30         }
  31 #else
  32         int pipe_fd[2];
  33         if(pipe(pipe_fd)==-1)
  34                 throw system_error("pipe");
  35
  36         *handle[0] = pipe_fd[0];
  37         *handle[1] = pipe_fd[1];
  38 #endif
  39
  40         set_events(P_INPUT);
  41 }
  42
  43 Pipe::~Pipe()
  44 {
  45         set_events(P_NONE);
  46
  47         signal_flush_required.emit();
  48         sys_close(handle[0]);
  49         sys_close(handle[1]);
  50 }
  51
  52 void Pipe::set_block(bool b)
  53 {
  54         mode = (mode&~M_NONBLOCK);
  55         if(b)
  56                 mode = (mode|M_NONBLOCK);
  57
  58 #ifndef WIN32
  59         int flags = fcntl(*handle[0], F_GETFD);
  60         fcntl(*handle[0], F_SETFL, (flags&O_NONBLOCK)|(b?0:O_NONBLOCK));
  61         flags = fcntl(*handle[1], F_GETFD);
  62         fcntl(*handle[1], F_SETFL, (flags&O_NONBLOCK)|(b?0:O_NONBLOCK));
  63 #endif
  64 }
  65
  66 unsigned Pipe::do_write(const char *buf, unsigned size)
  67 {
  68         if(size==0)
  69                 return 0;
  70
  71         return sys_write(handle[1], buf, size);
  72 }
  73
  74 unsigned Pipe::do_read(char *buf, unsigned size)
  75 {
  76         if(size==0)
  77                 return 0;
  78
  79         unsigned ret = reader.read(buf, size);
  80         if(ret==0)
  81                 set_eof();
  82
  83         return ret;
  84 }
  85
  86 } // namespace IO
  87 } // namespace Msp