MatN work for versatile appimage creation for all types of os

[goodguy/cinelerra.git] / cinelerra-5.1 / tools / makeappimagetool / pipe_reader.cpp

diff --git a/cinelerra-5.1/tools/makeappimagetool/pipe_reader.cpp b/cinelerra-5.1/tools/makeappimagetool/pipe_reader.cpp
new file mode 100644 (file)
index 0000000..1adc5d3
--- /dev/null
+++ b/cinelerra-5.1/tools/makeappimagetool/pipe_reader.cpp
@@ -0,0 +1,32 @@
+// system headers
+#include <algorithm>
+#include <fcntl.h>
+#include <unistd.h>
+#include <functional>
+#include <cstring>
+#include <stdexcept>
+
+// local headers
+#include "includes/pipe_reader.h"
+
+pipe_reader::pipe_reader(int pipe_fd) : pipe_fd_(pipe_fd) {
+    // add O_NONBLOCK TO fd's flags to be able to read
+    auto flags = fcntl(pipe_fd_, F_GETFL, 0);
+    flags |= O_NONBLOCK;
+    fcntl(pipe_fd_, F_SETFL, flags);
+}
+
+size_t pipe_reader::read(std::vector<std::string::value_type>& buffer) const {
+    ssize_t rv = ::read(pipe_fd_, buffer.data(), buffer.size());
+
+    if (rv == -1) {
+        // no data available
+        if (errno == EAGAIN)
+            return 0;
+
+        // TODO: introduce custom subprocess_error
+        throw std::runtime_error{"unexpected error reading from pipe: " + std::string(strerror(errno))};
+    }
+
+    return rv;
+}