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GFileDescriptorBased is implemented by GUnixInputStream and GUnixOutputStream.
GFileDescriptorBased is implemented by streams (implementations of GInputStream or GOutputStream) that are based on file descriptors.
Note that <gio/gfiledescriptorbased.h> belongs to
the UNIX-specific GIO interfaces, thus you have to use the
gio-unix-2.0.pc pkg-config file when using it.
int
g_file_descriptor_based_get_fd (GFileDescriptorBased *fd_based);
Gets the underlying file descriptor.
Since 2.24