Class input

cpp-subprocess/subprocess.hpp:911–933

! * Option to specify the input channel for the child * process. It can be: * 1. An already open file descriptor. * 2. A file name. * 3. IOTYPE. Usual a PIPE * * Eg: input{PIPE} * OR in case of redirection, output of another Popen * input{popen.output()} */

 * input{popen.output()}
 */
struct input
{
  // For an already existing file descriptor.
  explicit input(int fd): rd_ch_(fd) {}

  // FILE pointer.
  explicit input (FILE* fp):input(subprocess_fileno(fp)) { assert(fp); }

  explicit input(const char* filename) {
    int fd = subprocess_open(filename, O_RDONLY);
    if (fd == -1) throw OSError("File not found: ", errno);
    rd_ch_ = fd;
  }
  explicit input(IOTYPE typ) {
    assert (typ == PIPE && "STDOUT/STDERR not allowed");
#ifndef __USING_WINDOWS__
    std::tie(rd_ch_, wr_ch_) = util::pipe_cloexec();
#endif
  }

  int rd_ch_ = -1;
  int wr_ch_ = -1;
};


/*!