fd_unix.cpp

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/*
* Pipe I/O for Unix
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#include <botan/pipe.h>
 
#include <botan/exceptn.h>
#include <cerrno>
#include <unistd.h>
 
namespace Botan {
 
/*
* Write data from a pipe into a Unix fd
*/
int operator<<(int fd, Pipe& pipe) {
   secure_vector<uint8_t> buffer(DefaultBufferSize);
   while(pipe.remaining() > 0) {
      size_t got = pipe.read(buffer.data(), buffer.size());
      size_t position = 0;
      while(got > 0) {
         const ssize_t ret = ::write(fd, &buffer[position], got);
         if(ret < 0) {
            if(errno == EINTR) {
               continue;
            }
            throw Stream_IO_Error("Pipe output operator (unixfd) has failed");
         }
 
         position += static_cast<size_t>(ret);
         got -= static_cast<size_t>(ret);
      }
   }
   return fd;
}
 
/*
* Read data from a Unix fd into a pipe
*/
int operator>>(int fd, Pipe& pipe) {
   secure_vector<uint8_t> buffer(DefaultBufferSize);
   while(true) {
      const ssize_t ret = ::read(fd, buffer.data(), buffer.size());
      if(ret < 0) {
         if(errno == EINTR) {
            continue;
         }
         throw Stream_IO_Error("Pipe input operator (unixfd) has failed");
      } else if(ret == 0) {
         break;
      }
      pipe.write(buffer.data(), static_cast<size_t>(ret));
   }
   return fd;
}
 
}  // namespace Botan