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Here is the function. It does not write the entire image.

// imgdata is the image data to be written into a pgm image file

int writePgm( char* Filename, unsigned char* imgdata, int width, int...

I am trying to write .pgm images using the O_DIRECT flag in open().
I have a char* buffer which has the image data.

I know that I have to align the buffers and have done that using...