remove unneeded close_fds option from cpp-subprocess

src/util/subprocess.hpp

@@ -641,20 +641,6 @@ struct bufsize {
   int  bufsiz = 0;
 };
 
-/*!
- * Option to close all file descriptors
- * when the child process is spawned.
- * The close fd list does not include
- * input/output/error if they are explicitly
- * set as part of the Popen arguments.
- *
- * Default value is false.
- */
-struct close_fds {
-  explicit close_fds(bool c): close_all(c) {}
-  bool close_all = false;
-};
-
 /*!
  * Base class for all arguments involving string value.
  */
@@ -929,7 +915,6 @@ struct ArgumentDeducer
   void set_option(input&& inp);
   void set_option(output&& out);
   void set_option(error&& err);
-  void set_option(close_fds&& cfds);
 
 private:
   Popen* popen_ = nullptr;
@@ -1255,8 +1240,6 @@ private:
   std::future<void> cleanup_future_;
 #endif
 
-  bool close_fds_ = false;
-
   std::string exe_name_;
   std::string cwd_;
   env_map_t env_;
@@ -1572,10 +1555,6 @@ namespace detail {
     if (err.rd_ch_ != -1) popen_->stream_.err_read_ = err.rd_ch_;
   }
 
-  inline void ArgumentDeducer::set_option(close_fds&& cfds) {
-    popen_->close_fds_ = cfds.close_all;
-  }
-
 
   inline void Child::execute_child() {
 #ifndef __USING_WINDOWS__
@@ -1622,17 +1601,6 @@ namespace detail {
       if (stream.err_write_ != -1 && stream.err_write_ > 2)
         close(stream.err_write_);
 
-      // Close all the inherited fd's except the error write pipe
-      if (parent_->close_fds_) {
-        int max_fd = sysconf(_SC_OPEN_MAX);
-        if (max_fd == -1) throw OSError("sysconf failed", errno);
-
-        for (int i = 3; i < max_fd; i++) {
-          if (i == err_wr_pipe_) continue;
-          close(i);
-        }
-      }
-
       // Change the working directory if provided
       if (parent_->cwd_.length()) {
         sys_ret = chdir(parent_->cwd_.c_str());